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参考资料 ultralytics/utils/metrics.py

备注

该文件可从https://github.com/ultralytics/ultralytics/blob/main/ ultralytics/utils/metrics .py。如果您发现问题,请通过提交 Pull Request🛠️ 帮助修复。谢谢🙏!



ultralytics.utils.metrics.ConfusionMatrix

为物体检测和分类任务计算和更新混淆矩阵的类。

属性

名称 类型 说明
task str

任务类型,"检测 "或 "分类"。

matrix ndarray

混淆矩阵,维度取决于任务。

nc int

班级数量。

conf float

检测的置信阈值。

iou_thres float

联合门槛上的交叉路口

源代码 ultralytics/utils/metrics.py
class ConfusionMatrix:
    """
    A class for calculating and updating a confusion matrix for object detection and classification tasks.

    Attributes:
        task (str): The type of task, either 'detect' or 'classify'.
        matrix (np.ndarray): The confusion matrix, with dimensions depending on the task.
        nc (int): The number of classes.
        conf (float): The confidence threshold for detections.
        iou_thres (float): The Intersection over Union threshold.
    """

    def __init__(self, nc, conf=0.25, iou_thres=0.45, task="detect"):
        """Initialize attributes for the YOLO model."""
        self.task = task
        self.matrix = np.zeros((nc + 1, nc + 1)) if self.task == "detect" else np.zeros((nc, nc))
        self.nc = nc  # number of classes
        self.conf = 0.25 if conf in (None, 0.001) else conf  # apply 0.25 if default val conf is passed
        self.iou_thres = iou_thres

    def process_cls_preds(self, preds, targets):
        """
        Update confusion matrix for classification task.

        Args:
            preds (Array[N, min(nc,5)]): Predicted class labels.
            targets (Array[N, 1]): Ground truth class labels.
        """
        preds, targets = torch.cat(preds)[:, 0], torch.cat(targets)
        for p, t in zip(preds.cpu().numpy(), targets.cpu().numpy()):
            self.matrix[p][t] += 1

    def process_batch(self, detections, gt_bboxes, gt_cls):
        """
        Update confusion matrix for object detection task.

        Args:
            detections (Array[N, 6] | Array[N, 7]): Detected bounding boxes and their associated information.
                                      Each row should contain (x1, y1, x2, y2, conf, class)
                                      or with an additional element `angle` when it's obb.
            gt_bboxes (Array[M, 4]| Array[N, 5]): Ground truth bounding boxes with xyxy/xyxyr format.
            gt_cls (Array[M]): The class labels.
        """
        if gt_cls.shape[0] == 0:  # Check if labels is empty
            if detections is not None:
                detections = detections[detections[:, 4] > self.conf]
                detection_classes = detections[:, 5].int()
                for dc in detection_classes:
                    self.matrix[dc, self.nc] += 1  # false positives
            return
        if detections is None:
            gt_classes = gt_cls.int()
            for gc in gt_classes:
                self.matrix[self.nc, gc] += 1  # background FN
            return

        detections = detections[detections[:, 4] > self.conf]
        gt_classes = gt_cls.int()
        detection_classes = detections[:, 5].int()
        is_obb = detections.shape[1] == 7 and gt_bboxes.shape[1] == 5  # with additional `angle` dimension
        iou = (
            batch_probiou(gt_bboxes, torch.cat([detections[:, :4], detections[:, -1:]], dim=-1))
            if is_obb
            else box_iou(gt_bboxes, detections[:, :4])
        )

        x = torch.where(iou > self.iou_thres)
        if x[0].shape[0]:
            matches = torch.cat((torch.stack(x, 1), iou[x[0], x[1]][:, None]), 1).cpu().numpy()
            if x[0].shape[0] > 1:
                matches = matches[matches[:, 2].argsort()[::-1]]
                matches = matches[np.unique(matches[:, 1], return_index=True)[1]]
                matches = matches[matches[:, 2].argsort()[::-1]]
                matches = matches[np.unique(matches[:, 0], return_index=True)[1]]
        else:
            matches = np.zeros((0, 3))

        n = matches.shape[0] > 0
        m0, m1, _ = matches.transpose().astype(int)
        for i, gc in enumerate(gt_classes):
            j = m0 == i
            if n and sum(j) == 1:
                self.matrix[detection_classes[m1[j]], gc] += 1  # correct
            else:
                self.matrix[self.nc, gc] += 1  # true background

        if n:
            for i, dc in enumerate(detection_classes):
                if not any(m1 == i):
                    self.matrix[dc, self.nc] += 1  # predicted background

    def matrix(self):
        """Returns the confusion matrix."""
        return self.matrix

    def tp_fp(self):
        """Returns true positives and false positives."""
        tp = self.matrix.diagonal()  # true positives
        fp = self.matrix.sum(1) - tp  # false positives
        # fn = self.matrix.sum(0) - tp  # false negatives (missed detections)
        return (tp[:-1], fp[:-1]) if self.task == "detect" else (tp, fp)  # remove background class if task=detect

    @TryExcept("WARNING ⚠️ ConfusionMatrix plot failure")
    @plt_settings()
    def plot(self, normalize=True, save_dir="", names=(), on_plot=None):
        """
        Plot the confusion matrix using seaborn and save it to a file.

        Args:
            normalize (bool): Whether to normalize the confusion matrix.
            save_dir (str): Directory where the plot will be saved.
            names (tuple): Names of classes, used as labels on the plot.
            on_plot (func): An optional callback to pass plots path and data when they are rendered.
        """
        import seaborn as sn

        array = self.matrix / ((self.matrix.sum(0).reshape(1, -1) + 1e-9) if normalize else 1)  # normalize columns
        array[array < 0.005] = np.nan  # don't annotate (would appear as 0.00)

        fig, ax = plt.subplots(1, 1, figsize=(12, 9), tight_layout=True)
        nc, nn = self.nc, len(names)  # number of classes, names
        sn.set(font_scale=1.0 if nc < 50 else 0.8)  # for label size
        labels = (0 < nn < 99) and (nn == nc)  # apply names to ticklabels
        ticklabels = (list(names) + ["background"]) if labels else "auto"
        with warnings.catch_warnings():
            warnings.simplefilter("ignore")  # suppress empty matrix RuntimeWarning: All-NaN slice encountered
            sn.heatmap(
                array,
                ax=ax,
                annot=nc < 30,
                annot_kws={"size": 8},
                cmap="Blues",
                fmt=".2f" if normalize else ".0f",
                square=True,
                vmin=0.0,
                xticklabels=ticklabels,
                yticklabels=ticklabels,
            ).set_facecolor((1, 1, 1))
        title = "Confusion Matrix" + " Normalized" * normalize
        ax.set_xlabel("True")
        ax.set_ylabel("Predicted")
        ax.set_title(title)
        plot_fname = Path(save_dir) / f'{title.lower().replace(" ", "_")}.png'
        fig.savefig(plot_fname, dpi=250)
        plt.close(fig)
        if on_plot:
            on_plot(plot_fname)

    def print(self):
        """Print the confusion matrix to the console."""
        for i in range(self.nc + 1):
            LOGGER.info(" ".join(map(str, self.matrix[i])))

__init__(nc, conf=0.25, iou_thres=0.45, task='detect')

初始化YOLO 模型的属性。

源代码 ultralytics/utils/metrics.py
def __init__(self, nc, conf=0.25, iou_thres=0.45, task="detect"):
    """Initialize attributes for the YOLO model."""
    self.task = task
    self.matrix = np.zeros((nc + 1, nc + 1)) if self.task == "detect" else np.zeros((nc, nc))
    self.nc = nc  # number of classes
    self.conf = 0.25 if conf in (None, 0.001) else conf  # apply 0.25 if default val conf is passed
    self.iou_thres = iou_thres

matrix()

返回混淆矩阵。

源代码 ultralytics/utils/metrics.py
def matrix(self):
    """Returns the confusion matrix."""
    return self.matrix

plot(normalize=True, save_dir='', names=(), on_plot=None)

使用 seaborn 绘制混淆矩阵并保存到文件中。

参数

名称 类型 说明 默认值
normalize bool

是否对混淆矩阵进行归一化处理。

True
save_dir str

保存绘图的目录。

''
names tuple

类别名称,用作绘图上的标签。

()
on_plot func

可选的回调,用于在渲染时传递绘图路径和数据。

None
源代码 ultralytics/utils/metrics.py
@TryExcept("WARNING ⚠️ ConfusionMatrix plot failure")
@plt_settings()
def plot(self, normalize=True, save_dir="", names=(), on_plot=None):
    """
    Plot the confusion matrix using seaborn and save it to a file.

    Args:
        normalize (bool): Whether to normalize the confusion matrix.
        save_dir (str): Directory where the plot will be saved.
        names (tuple): Names of classes, used as labels on the plot.
        on_plot (func): An optional callback to pass plots path and data when they are rendered.
    """
    import seaborn as sn

    array = self.matrix / ((self.matrix.sum(0).reshape(1, -1) + 1e-9) if normalize else 1)  # normalize columns
    array[array < 0.005] = np.nan  # don't annotate (would appear as 0.00)

    fig, ax = plt.subplots(1, 1, figsize=(12, 9), tight_layout=True)
    nc, nn = self.nc, len(names)  # number of classes, names
    sn.set(font_scale=1.0 if nc < 50 else 0.8)  # for label size
    labels = (0 < nn < 99) and (nn == nc)  # apply names to ticklabels
    ticklabels = (list(names) + ["background"]) if labels else "auto"
    with warnings.catch_warnings():
        warnings.simplefilter("ignore")  # suppress empty matrix RuntimeWarning: All-NaN slice encountered
        sn.heatmap(
            array,
            ax=ax,
            annot=nc < 30,
            annot_kws={"size": 8},
            cmap="Blues",
            fmt=".2f" if normalize else ".0f",
            square=True,
            vmin=0.0,
            xticklabels=ticklabels,
            yticklabels=ticklabels,
        ).set_facecolor((1, 1, 1))
    title = "Confusion Matrix" + " Normalized" * normalize
    ax.set_xlabel("True")
    ax.set_ylabel("Predicted")
    ax.set_title(title)
    plot_fname = Path(save_dir) / f'{title.lower().replace(" ", "_")}.png'
    fig.savefig(plot_fname, dpi=250)
    plt.close(fig)
    if on_plot:
        on_plot(plot_fname)

print()

将混淆矩阵打印到控制台。

源代码 ultralytics/utils/metrics.py
def print(self):
    """Print the confusion matrix to the console."""
    for i in range(self.nc + 1):
        LOGGER.info(" ".join(map(str, self.matrix[i])))

process_batch(detections, gt_bboxes, gt_cls)

更新目标检测任务的混淆矩阵

参数

名称 类型 说明 默认值
detections Array[N, 6] | Array[N, 7]

检测到的边界框及其相关信息。 每行应包含(x1, y1, x2, y2, conf, class) 或一个附加元素 angle 当它是 obb 时。

所需
gt_bboxes Array[M, 4] | Array[N, 5]

采用 xyxy/xyxyr 格式的地面实况边界框。

所需
gt_cls Array[M]

类标签。

所需
源代码 ultralytics/utils/metrics.py
def process_batch(self, detections, gt_bboxes, gt_cls):
    """
    Update confusion matrix for object detection task.

    Args:
        detections (Array[N, 6] | Array[N, 7]): Detected bounding boxes and their associated information.
                                  Each row should contain (x1, y1, x2, y2, conf, class)
                                  or with an additional element `angle` when it's obb.
        gt_bboxes (Array[M, 4]| Array[N, 5]): Ground truth bounding boxes with xyxy/xyxyr format.
        gt_cls (Array[M]): The class labels.
    """
    if gt_cls.shape[0] == 0:  # Check if labels is empty
        if detections is not None:
            detections = detections[detections[:, 4] > self.conf]
            detection_classes = detections[:, 5].int()
            for dc in detection_classes:
                self.matrix[dc, self.nc] += 1  # false positives
        return
    if detections is None:
        gt_classes = gt_cls.int()
        for gc in gt_classes:
            self.matrix[self.nc, gc] += 1  # background FN
        return

    detections = detections[detections[:, 4] > self.conf]
    gt_classes = gt_cls.int()
    detection_classes = detections[:, 5].int()
    is_obb = detections.shape[1] == 7 and gt_bboxes.shape[1] == 5  # with additional `angle` dimension
    iou = (
        batch_probiou(gt_bboxes, torch.cat([detections[:, :4], detections[:, -1:]], dim=-1))
        if is_obb
        else box_iou(gt_bboxes, detections[:, :4])
    )

    x = torch.where(iou > self.iou_thres)
    if x[0].shape[0]:
        matches = torch.cat((torch.stack(x, 1), iou[x[0], x[1]][:, None]), 1).cpu().numpy()
        if x[0].shape[0] > 1:
            matches = matches[matches[:, 2].argsort()[::-1]]
            matches = matches[np.unique(matches[:, 1], return_index=True)[1]]
            matches = matches[matches[:, 2].argsort()[::-1]]
            matches = matches[np.unique(matches[:, 0], return_index=True)[1]]
    else:
        matches = np.zeros((0, 3))

    n = matches.shape[0] > 0
    m0, m1, _ = matches.transpose().astype(int)
    for i, gc in enumerate(gt_classes):
        j = m0 == i
        if n and sum(j) == 1:
            self.matrix[detection_classes[m1[j]], gc] += 1  # correct
        else:
            self.matrix[self.nc, gc] += 1  # true background

    if n:
        for i, dc in enumerate(detection_classes):
            if not any(m1 == i):
                self.matrix[dc, self.nc] += 1  # predicted background

process_cls_preds(preds, targets)

更新分类任务的混淆矩阵

参数

名称 类型 说明 默认值
preds Array[N, min(nc, 5)]

预测的类别标签

所需
targets Array[N, 1]

基本真实类别标签。

所需
源代码 ultralytics/utils/metrics.py
def process_cls_preds(self, preds, targets):
    """
    Update confusion matrix for classification task.

    Args:
        preds (Array[N, min(nc,5)]): Predicted class labels.
        targets (Array[N, 1]): Ground truth class labels.
    """
    preds, targets = torch.cat(preds)[:, 0], torch.cat(targets)
    for p, t in zip(preds.cpu().numpy(), targets.cpu().numpy()):
        self.matrix[p][t] += 1

tp_fp()

返回真阳性和假阳性。

源代码 ultralytics/utils/metrics.py
def tp_fp(self):
    """Returns true positives and false positives."""
    tp = self.matrix.diagonal()  # true positives
    fp = self.matrix.sum(1) - tp  # false positives
    # fn = self.matrix.sum(0) - tp  # false negatives (missed detections)
    return (tp[:-1], fp[:-1]) if self.task == "detect" else (tp, fp)  # remove background class if task=detect



ultralytics.utils.metrics.Metric

垒球 SimpleClass

用于计算YOLOv8 模型评价指标的类。

属性

名称 类型 说明
p list

每类的精确度。形状:(nc,)。

r list

每类的召回率。形状:(nc, )。

f1 list

每类的 F1 分数。形状:(nc, )。

all_ap list

所有班级和所有 IoU 临界值的 AP 分数。形状:(nc,10)。

ap_class_index list

每个 AP 分数的班级指数。形状:(nc,)。

nc int

班级数量

方法

名称 说明
ap50

所有班级在 IoU 临界值为 0.5 时的 AP。返回:AP 分数列表。形状: (nc,) 或 [].

ap

在 IoU 临界值为 0.5 至 0.95 时的所有类别的 AP。返回:AP 分数列表。形状: (nc,) 或 [].

mp

所有等级的平均精度。返回值:浮点数。

mr

所有班级的平均召回率。返回值:浮点数。

map50

所有班级在 IoU 临界值 0.5 时的平均 AP 值。返回值:浮点数。

map75

所有班级在 IoU 临界值 0.75 时的平均 AP 值。返回值:浮点数。

map

所有等级在 IoU 临界值 0.5 至 0.95 时的平均 AP 值。返回值:浮点数。

mean_results

结果的平均值,返回 mp、mr、map50、map。

class_result

类别感知结果,返回 p[i]、r[i]、ap50[i]、ap[i]。

maps

每个类的 mAP。返回值mAP 分数数组,形状:(nc,)。

fitness

模型适配度作为各项指标的加权组合。返回值:浮点数。

update

根据新的评估结果更新度量属性。

源代码 ultralytics/utils/metrics.py
class Metric(SimpleClass):
    """
    Class for computing evaluation metrics for YOLOv8 model.

    Attributes:
        p (list): Precision for each class. Shape: (nc,).
        r (list): Recall for each class. Shape: (nc,).
        f1 (list): F1 score for each class. Shape: (nc,).
        all_ap (list): AP scores for all classes and all IoU thresholds. Shape: (nc, 10).
        ap_class_index (list): Index of class for each AP score. Shape: (nc,).
        nc (int): Number of classes.

    Methods:
        ap50(): AP at IoU threshold of 0.5 for all classes. Returns: List of AP scores. Shape: (nc,) or [].
        ap(): AP at IoU thresholds from 0.5 to 0.95 for all classes. Returns: List of AP scores. Shape: (nc,) or [].
        mp(): Mean precision of all classes. Returns: Float.
        mr(): Mean recall of all classes. Returns: Float.
        map50(): Mean AP at IoU threshold of 0.5 for all classes. Returns: Float.
        map75(): Mean AP at IoU threshold of 0.75 for all classes. Returns: Float.
        map(): Mean AP at IoU thresholds from 0.5 to 0.95 for all classes. Returns: Float.
        mean_results(): Mean of results, returns mp, mr, map50, map.
        class_result(i): Class-aware result, returns p[i], r[i], ap50[i], ap[i].
        maps(): mAP of each class. Returns: Array of mAP scores, shape: (nc,).
        fitness(): Model fitness as a weighted combination of metrics. Returns: Float.
        update(results): Update metric attributes with new evaluation results.
    """

    def __init__(self) -> None:
        """Initializes a Metric instance for computing evaluation metrics for the YOLOv8 model."""
        self.p = []  # (nc, )
        self.r = []  # (nc, )
        self.f1 = []  # (nc, )
        self.all_ap = []  # (nc, 10)
        self.ap_class_index = []  # (nc, )
        self.nc = 0

    @property
    def ap50(self):
        """
        Returns the Average Precision (AP) at an IoU threshold of 0.5 for all classes.

        Returns:
            (np.ndarray, list): Array of shape (nc,) with AP50 values per class, or an empty list if not available.
        """
        return self.all_ap[:, 0] if len(self.all_ap) else []

    @property
    def ap(self):
        """
        Returns the Average Precision (AP) at an IoU threshold of 0.5-0.95 for all classes.

        Returns:
            (np.ndarray, list): Array of shape (nc,) with AP50-95 values per class, or an empty list if not available.
        """
        return self.all_ap.mean(1) if len(self.all_ap) else []

    @property
    def mp(self):
        """
        Returns the Mean Precision of all classes.

        Returns:
            (float): The mean precision of all classes.
        """
        return self.p.mean() if len(self.p) else 0.0

    @property
    def mr(self):
        """
        Returns the Mean Recall of all classes.

        Returns:
            (float): The mean recall of all classes.
        """
        return self.r.mean() if len(self.r) else 0.0

    @property
    def map50(self):
        """
        Returns the mean Average Precision (mAP) at an IoU threshold of 0.5.

        Returns:
            (float): The mAP at an IoU threshold of 0.5.
        """
        return self.all_ap[:, 0].mean() if len(self.all_ap) else 0.0

    @property
    def map75(self):
        """
        Returns the mean Average Precision (mAP) at an IoU threshold of 0.75.

        Returns:
            (float): The mAP at an IoU threshold of 0.75.
        """
        return self.all_ap[:, 5].mean() if len(self.all_ap) else 0.0

    @property
    def map(self):
        """
        Returns the mean Average Precision (mAP) over IoU thresholds of 0.5 - 0.95 in steps of 0.05.

        Returns:
            (float): The mAP over IoU thresholds of 0.5 - 0.95 in steps of 0.05.
        """
        return self.all_ap.mean() if len(self.all_ap) else 0.0

    def mean_results(self):
        """Mean of results, return mp, mr, map50, map."""
        return [self.mp, self.mr, self.map50, self.map]

    def class_result(self, i):
        """Class-aware result, return p[i], r[i], ap50[i], ap[i]."""
        return self.p[i], self.r[i], self.ap50[i], self.ap[i]

    @property
    def maps(self):
        """MAP of each class."""
        maps = np.zeros(self.nc) + self.map
        for i, c in enumerate(self.ap_class_index):
            maps[c] = self.ap[i]
        return maps

    def fitness(self):
        """Model fitness as a weighted combination of metrics."""
        w = [0.0, 0.0, 0.1, 0.9]  # weights for [P, R, mAP@0.5, mAP@0.5:0.95]
        return (np.array(self.mean_results()) * w).sum()

    def update(self, results):
        """
        Updates the evaluation metrics of the model with a new set of results.

        Args:
            results (tuple): A tuple containing the following evaluation metrics:
                - p (list): Precision for each class. Shape: (nc,).
                - r (list): Recall for each class. Shape: (nc,).
                - f1 (list): F1 score for each class. Shape: (nc,).
                - all_ap (list): AP scores for all classes and all IoU thresholds. Shape: (nc, 10).
                - ap_class_index (list): Index of class for each AP score. Shape: (nc,).

        Side Effects:
            Updates the class attributes `self.p`, `self.r`, `self.f1`, `self.all_ap`, and `self.ap_class_index` based
            on the values provided in the `results` tuple.
        """
        (
            self.p,
            self.r,
            self.f1,
            self.all_ap,
            self.ap_class_index,
            self.p_curve,
            self.r_curve,
            self.f1_curve,
            self.px,
            self.prec_values,
        ) = results

    @property
    def curves(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return []

    @property
    def curves_results(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return [
            [self.px, self.prec_values, "Recall", "Precision"],
            [self.px, self.f1_curve, "Confidence", "F1"],
            [self.px, self.p_curve, "Confidence", "Precision"],
            [self.px, self.r_curve, "Confidence", "Recall"],
        ]

ap property

在 IoU 阈值为 0.5-0.95 时,返回所有类别的平均精度 (AP)。

返回:

类型 说明
(ndarray, list)

包含每个类别 AP50-95 值的形状 (nc,) 数组,如果没有,则为空列表。

ap50 property

在 IoU 阈值为 0.5 时,返回所有类别的平均精度 (AP)。

返回:

类型 说明
(ndarray, list)

包含每个类别 AP50 值的形状 (nc,) 数组,如果没有,则为空列表。

curves property

返回用于访问特定度量曲线的曲线列表。

curves_results property

返回用于访问特定度量曲线的曲线列表。

map property

在 0.5 - 0.95 的 IoU 临界值范围内,以 0.05 为步长,返回平均精度 (mAP)。

返回:

类型 说明
float

在 IoU 临界值 0.5 - 0.95 之间的 mAP,步长为 0.05。

map50 property

返回 IoU 阈值为 0.5 时的平均精度 (mAP)。

返回:

类型 说明
float

IoU 临界值为 0.5 时的 mAP。

map75 property

返回 IoU 阈值为 0.75 时的平均精度 (mAP)。

返回:

类型 说明
float

IoU 临界值为 0.75 时的 mAP。

maps property

各班的 MAP。

mp property

返回所有类别的平均精度。

返回:

类型 说明
float

所有等级的平均精度。

mr property

返回所有类别的平均召回率。

返回:

类型 说明
float

所有班级的平均召回率。

__init__()

初始化一个 Metric 实例,用于计算YOLOv8 模型的评估指标。

源代码 ultralytics/utils/metrics.py
def __init__(self) -> None:
    """Initializes a Metric instance for computing evaluation metrics for the YOLOv8 model."""
    self.p = []  # (nc, )
    self.r = []  # (nc, )
    self.f1 = []  # (nc, )
    self.all_ap = []  # (nc, 10)
    self.ap_class_index = []  # (nc, )
    self.nc = 0

class_result(i)

类别感知结果,返回 p[i]、r[i]、ap50[i]、ap[i]。

源代码 ultralytics/utils/metrics.py
def class_result(self, i):
    """Class-aware result, return p[i], r[i], ap50[i], ap[i]."""
    return self.p[i], self.r[i], self.ap50[i], self.ap[i]

fitness()

模型适配性是各项指标的加权组合。

源代码 ultralytics/utils/metrics.py
def fitness(self):
    """Model fitness as a weighted combination of metrics."""
    w = [0.0, 0.0, 0.1, 0.9]  # weights for [P, R, mAP@0.5, mAP@0.5:0.95]
    return (np.array(self.mean_results()) * w).sum()

mean_results()

结果的平均值,返回 mp、mr、map50、map。

源代码 ultralytics/utils/metrics.py
def mean_results(self):
    """Mean of results, return mp, mr, map50, map."""
    return [self.mp, self.mr, self.map50, self.map]

update(results)

用一组新结果更新模型的评估指标。

参数

名称 类型 说明 默认值
results tuple

包含以下评价指标的元组: - p(列表):每个类别的精确度。形状:(nc,)。 - r(列表):每个类别的召回率。形状:(nc,)。 - f1(列表):每个类别的 F1 分数。Shape: (nc,). - all_ap(列表):所有类别和所有 IoU 临界值的 AP 分数。形状:(nc, 10)。 - ap_class_index(列表):每个 AP 分数的类别索引。形状:(nc, )。

所需
副作用

更新类属性 self.p, self.r, self.f1, self.all_apself.ap_class_index 基于 中提供的值为基础 results 元组。

源代码 ultralytics/utils/metrics.py
def update(self, results):
    """
    Updates the evaluation metrics of the model with a new set of results.

    Args:
        results (tuple): A tuple containing the following evaluation metrics:
            - p (list): Precision for each class. Shape: (nc,).
            - r (list): Recall for each class. Shape: (nc,).
            - f1 (list): F1 score for each class. Shape: (nc,).
            - all_ap (list): AP scores for all classes and all IoU thresholds. Shape: (nc, 10).
            - ap_class_index (list): Index of class for each AP score. Shape: (nc,).

    Side Effects:
        Updates the class attributes `self.p`, `self.r`, `self.f1`, `self.all_ap`, and `self.ap_class_index` based
        on the values provided in the `results` tuple.
    """
    (
        self.p,
        self.r,
        self.f1,
        self.all_ap,
        self.ap_class_index,
        self.p_curve,
        self.r_curve,
        self.f1_curve,
        self.px,
        self.prec_values,
    ) = results



ultralytics.utils.metrics.DetMetrics

垒球 SimpleClass

该类是一个实用类,用于计算检测指标,如精度、召回率和平均精度(mAP (mAP) 的检测指标。

参数

名称 类型 说明 默认值
save_dir Path

保存输出绘图的目录路径。默认为当前目录。

Path('.')
plot bool

表示是否为每个类别绘制精确度-召回曲线的标志。默认为 "假"。

False
on_plot func

可选的回调,用于在渲染时传递绘图路径和数据。默认为 "无"。

None
names tuple of str

表示类名称的字符串元组。默认为空元组。

()

属性

名称 类型 说明
save_dir Path

保存输出绘图的目录路径。

plot bool

表示是否绘制每个类别的精度-召回曲线的标志。

on_plot func

可选的回调,用于在渲染时传递绘图路径和数据。

names tuple of str

表示类名称的字符串元组。

box Metric

度量类的实例,用于存储检测度量的结果。

speed dict

用于存储检测过程各部分执行时间的字典。

方法

名称 说明
process

用最新一批预测结果更新度量结果。

keys

返回用于访问计算出的检测指标的键列表。

mean_results

返回计算出的检测指标的平均值列表。

class_result

返回特定类的计算检测指标值列表。

maps

返回不同 IoU 阈值的平均精度 (mAP) 值字典。

fitness

根据计算出的检测指标计算适合度得分。

ap_class_index

返回按平均精度 (AP) 值排序的类索引列表。

results_dict

返回将检测度量键映射到其计算值的字典。

curves

TODO

curves_results

TODO

源代码 ultralytics/utils/metrics.py
class DetMetrics(SimpleClass):
    """
    This class is a utility class for computing detection metrics such as precision, recall, and mean average precision
    (mAP) of an object detection model.

    Args:
        save_dir (Path): A path to the directory where the output plots will be saved. Defaults to current directory.
        plot (bool): A flag that indicates whether to plot precision-recall curves for each class. Defaults to False.
        on_plot (func): An optional callback to pass plots path and data when they are rendered. Defaults to None.
        names (tuple of str): A tuple of strings that represents the names of the classes. Defaults to an empty tuple.

    Attributes:
        save_dir (Path): A path to the directory where the output plots will be saved.
        plot (bool): A flag that indicates whether to plot the precision-recall curves for each class.
        on_plot (func): An optional callback to pass plots path and data when they are rendered.
        names (tuple of str): A tuple of strings that represents the names of the classes.
        box (Metric): An instance of the Metric class for storing the results of the detection metrics.
        speed (dict): A dictionary for storing the execution time of different parts of the detection process.

    Methods:
        process(tp, conf, pred_cls, target_cls): Updates the metric results with the latest batch of predictions.
        keys: Returns a list of keys for accessing the computed detection metrics.
        mean_results: Returns a list of mean values for the computed detection metrics.
        class_result(i): Returns a list of values for the computed detection metrics for a specific class.
        maps: Returns a dictionary of mean average precision (mAP) values for different IoU thresholds.
        fitness: Computes the fitness score based on the computed detection metrics.
        ap_class_index: Returns a list of class indices sorted by their average precision (AP) values.
        results_dict: Returns a dictionary that maps detection metric keys to their computed values.
        curves: TODO
        curves_results: TODO
    """

    def __init__(self, save_dir=Path("."), plot=False, on_plot=None, names=()) -> None:
        """Initialize a DetMetrics instance with a save directory, plot flag, callback function, and class names."""
        self.save_dir = save_dir
        self.plot = plot
        self.on_plot = on_plot
        self.names = names
        self.box = Metric()
        self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
        self.task = "detect"

    def process(self, tp, conf, pred_cls, target_cls):
        """Process predicted results for object detection and update metrics."""
        results = ap_per_class(
            tp,
            conf,
            pred_cls,
            target_cls,
            plot=self.plot,
            save_dir=self.save_dir,
            names=self.names,
            on_plot=self.on_plot,
        )[2:]
        self.box.nc = len(self.names)
        self.box.update(results)

    @property
    def keys(self):
        """Returns a list of keys for accessing specific metrics."""
        return ["metrics/precision(B)", "metrics/recall(B)", "metrics/mAP50(B)", "metrics/mAP50-95(B)"]

    def mean_results(self):
        """Calculate mean of detected objects & return precision, recall, mAP50, and mAP50-95."""
        return self.box.mean_results()

    def class_result(self, i):
        """Return the result of evaluating the performance of an object detection model on a specific class."""
        return self.box.class_result(i)

    @property
    def maps(self):
        """Returns mean Average Precision (mAP) scores per class."""
        return self.box.maps

    @property
    def fitness(self):
        """Returns the fitness of box object."""
        return self.box.fitness()

    @property
    def ap_class_index(self):
        """Returns the average precision index per class."""
        return self.box.ap_class_index

    @property
    def results_dict(self):
        """Returns dictionary of computed performance metrics and statistics."""
        return dict(zip(self.keys + ["fitness"], self.mean_results() + [self.fitness]))

    @property
    def curves(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return ["Precision-Recall(B)", "F1-Confidence(B)", "Precision-Confidence(B)", "Recall-Confidence(B)"]

    @property
    def curves_results(self):
        """Returns dictionary of computed performance metrics and statistics."""
        return self.box.curves_results

ap_class_index property

返回每个类别的平均精度指数。

curves property

返回用于访问特定度量曲线的曲线列表。

curves_results property

返回已计算性能指标和统计数据的字典。

fitness property

返回盒对象的适配性。

keys property

返回用于访问特定指标的键列表。

maps property

返回每个类别的平均精度 (mAP) 分数。

results_dict property

返回已计算性能指标和统计数据的字典。

__init__(save_dir=Path('.'), plot=False, on_plot=None, names=())

使用保存目录、绘图标志、回调函数和类名初始化 DetMetrics 实例。

源代码 ultralytics/utils/metrics.py
def __init__(self, save_dir=Path("."), plot=False, on_plot=None, names=()) -> None:
    """Initialize a DetMetrics instance with a save directory, plot flag, callback function, and class names."""
    self.save_dir = save_dir
    self.plot = plot
    self.on_plot = on_plot
    self.names = names
    self.box = Metric()
    self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
    self.task = "detect"

class_result(i)

返回对象检测模型在特定类别上的性能评估结果。

源代码 ultralytics/utils/metrics.py
def class_result(self, i):
    """Return the result of evaluating the performance of an object detection model on a specific class."""
    return self.box.class_result(i)

mean_results()

计算检测对象的平均值,并返回精确度、召回率、mAP50 和 mAP50-95。

源代码 ultralytics/utils/metrics.py
def mean_results(self):
    """Calculate mean of detected objects & return precision, recall, mAP50, and mAP50-95."""
    return self.box.mean_results()

process(tp, conf, pred_cls, target_cls)

处理物体检测的预测结果并更新指标。

源代码 ultralytics/utils/metrics.py
def process(self, tp, conf, pred_cls, target_cls):
    """Process predicted results for object detection and update metrics."""
    results = ap_per_class(
        tp,
        conf,
        pred_cls,
        target_cls,
        plot=self.plot,
        save_dir=self.save_dir,
        names=self.names,
        on_plot=self.on_plot,
    )[2:]
    self.box.nc = len(self.names)
    self.box.update(results)



ultralytics.utils.metrics.SegmentMetrics

垒球 SimpleClass

计算和汇总给定类别集的检测和分割指标。

参数

名称 类型 说明 默认值
save_dir Path

保存输出绘图的目录路径。默认为当前目录。

Path('.')
plot bool

是否保存检测和分割图。默认为 "假"。

False
on_plot func

可选的回调,用于在渲染时传递绘图路径和数据。默认为 "无"。

None
names list

类名称列表。默认为空列表。

()

属性

名称 类型 说明
save_dir Path

保存输出绘图的目录路径。

plot bool

是否保存检测和分割图。

on_plot func

可选的回调,用于在渲染时传递绘图路径和数据。

names list

类名列表。

box Metric

用于计算方框检测指标的 Metric 类实例。

seg Metric

度量类的一个实例,用于计算掩膜分割度量。

speed dict

字典,用于存储推理不同阶段所用的时间。

方法

名称 说明
process

对给定的预测集进行度量处理。

mean_results

返回所有类别的检测和分割指标的平均值。

class_result

返回类别 i.

maps

返回 IoU 阈值从 0.50 到 0.95 的平均精度 (mAP) 分数。

fitness

返回拟合度得分,它是各项指标的单一加权组合。

ap_class_index

返回用于计算平均精度 (AP) 的类索引列表。

results_dict

返回包含所有检测和分割指标以及适合度得分的字典。

源代码 ultralytics/utils/metrics.py
class SegmentMetrics(SimpleClass):
    """
    Calculates and aggregates detection and segmentation metrics over a given set of classes.

    Args:
        save_dir (Path): Path to the directory where the output plots should be saved. Default is the current directory.
        plot (bool): Whether to save the detection and segmentation plots. Default is False.
        on_plot (func): An optional callback to pass plots path and data when they are rendered. Defaults to None.
        names (list): List of class names. Default is an empty list.

    Attributes:
        save_dir (Path): Path to the directory where the output plots should be saved.
        plot (bool): Whether to save the detection and segmentation plots.
        on_plot (func): An optional callback to pass plots path and data when they are rendered.
        names (list): List of class names.
        box (Metric): An instance of the Metric class to calculate box detection metrics.
        seg (Metric): An instance of the Metric class to calculate mask segmentation metrics.
        speed (dict): Dictionary to store the time taken in different phases of inference.

    Methods:
        process(tp_m, tp_b, conf, pred_cls, target_cls): Processes metrics over the given set of predictions.
        mean_results(): Returns the mean of the detection and segmentation metrics over all the classes.
        class_result(i): Returns the detection and segmentation metrics of class `i`.
        maps: Returns the mean Average Precision (mAP) scores for IoU thresholds ranging from 0.50 to 0.95.
        fitness: Returns the fitness scores, which are a single weighted combination of metrics.
        ap_class_index: Returns the list of indices of classes used to compute Average Precision (AP).
        results_dict: Returns the dictionary containing all the detection and segmentation metrics and fitness score.
    """

    def __init__(self, save_dir=Path("."), plot=False, on_plot=None, names=()) -> None:
        """Initialize a SegmentMetrics instance with a save directory, plot flag, callback function, and class names."""
        self.save_dir = save_dir
        self.plot = plot
        self.on_plot = on_plot
        self.names = names
        self.box = Metric()
        self.seg = Metric()
        self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
        self.task = "segment"

    def process(self, tp, tp_m, conf, pred_cls, target_cls):
        """
        Processes the detection and segmentation metrics over the given set of predictions.

        Args:
            tp (list): List of True Positive boxes.
            tp_m (list): List of True Positive masks.
            conf (list): List of confidence scores.
            pred_cls (list): List of predicted classes.
            target_cls (list): List of target classes.
        """

        results_mask = ap_per_class(
            tp_m,
            conf,
            pred_cls,
            target_cls,
            plot=self.plot,
            on_plot=self.on_plot,
            save_dir=self.save_dir,
            names=self.names,
            prefix="Mask",
        )[2:]
        self.seg.nc = len(self.names)
        self.seg.update(results_mask)
        results_box = ap_per_class(
            tp,
            conf,
            pred_cls,
            target_cls,
            plot=self.plot,
            on_plot=self.on_plot,
            save_dir=self.save_dir,
            names=self.names,
            prefix="Box",
        )[2:]
        self.box.nc = len(self.names)
        self.box.update(results_box)

    @property
    def keys(self):
        """Returns a list of keys for accessing metrics."""
        return [
            "metrics/precision(B)",
            "metrics/recall(B)",
            "metrics/mAP50(B)",
            "metrics/mAP50-95(B)",
            "metrics/precision(M)",
            "metrics/recall(M)",
            "metrics/mAP50(M)",
            "metrics/mAP50-95(M)",
        ]

    def mean_results(self):
        """Return the mean metrics for bounding box and segmentation results."""
        return self.box.mean_results() + self.seg.mean_results()

    def class_result(self, i):
        """Returns classification results for a specified class index."""
        return self.box.class_result(i) + self.seg.class_result(i)

    @property
    def maps(self):
        """Returns mAP scores for object detection and semantic segmentation models."""
        return self.box.maps + self.seg.maps

    @property
    def fitness(self):
        """Get the fitness score for both segmentation and bounding box models."""
        return self.seg.fitness() + self.box.fitness()

    @property
    def ap_class_index(self):
        """Boxes and masks have the same ap_class_index."""
        return self.box.ap_class_index

    @property
    def results_dict(self):
        """Returns results of object detection model for evaluation."""
        return dict(zip(self.keys + ["fitness"], self.mean_results() + [self.fitness]))

    @property
    def curves(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return [
            "Precision-Recall(B)",
            "F1-Confidence(B)",
            "Precision-Confidence(B)",
            "Recall-Confidence(B)",
            "Precision-Recall(M)",
            "F1-Confidence(M)",
            "Precision-Confidence(M)",
            "Recall-Confidence(M)",
        ]

    @property
    def curves_results(self):
        """Returns dictionary of computed performance metrics and statistics."""
        return self.box.curves_results + self.seg.curves_results

ap_class_index property

方框和屏蔽具有相同的 ap_class_index。

curves property

返回用于访问特定度量曲线的曲线列表。

curves_results property

返回已计算性能指标和统计数据的字典。

fitness property

获取分割模型和边界框模型的适合度得分。

keys property

返回用于访问度量的键值列表。

maps property

返回对象检测和语义分割模型的 mAP 分数。

results_dict property

返回对象检测模型的评估结果。

__init__(save_dir=Path('.'), plot=False, on_plot=None, names=())

使用保存目录、绘图标志、回调函数和类名初始化 SegmentMetrics 实例。

源代码 ultralytics/utils/metrics.py
def __init__(self, save_dir=Path("."), plot=False, on_plot=None, names=()) -> None:
    """Initialize a SegmentMetrics instance with a save directory, plot flag, callback function, and class names."""
    self.save_dir = save_dir
    self.plot = plot
    self.on_plot = on_plot
    self.names = names
    self.box = Metric()
    self.seg = Metric()
    self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
    self.task = "segment"

class_result(i)

返回指定类别索引的分类结果。

源代码 ultralytics/utils/metrics.py
def class_result(self, i):
    """Returns classification results for a specified class index."""
    return self.box.class_result(i) + self.seg.class_result(i)

mean_results()

返回边界框和分割结果的平均指标。

源代码 ultralytics/utils/metrics.py
def mean_results(self):
    """Return the mean metrics for bounding box and segmentation results."""
    return self.box.mean_results() + self.seg.mean_results()

process(tp, tp_m, conf, pred_cls, target_cls)

根据给定的预测集处理检测和分割指标。

参数

名称 类型 说明 默认值
tp list

真阳性方框列表。

所需
tp_m list

真阳性面具列表。

所需
conf list

置信度列表。

所需
pred_cls list

预测等级列表。

所需
target_cls list

目标类列表。

所需
源代码 ultralytics/utils/metrics.py
def process(self, tp, tp_m, conf, pred_cls, target_cls):
    """
    Processes the detection and segmentation metrics over the given set of predictions.

    Args:
        tp (list): List of True Positive boxes.
        tp_m (list): List of True Positive masks.
        conf (list): List of confidence scores.
        pred_cls (list): List of predicted classes.
        target_cls (list): List of target classes.
    """

    results_mask = ap_per_class(
        tp_m,
        conf,
        pred_cls,
        target_cls,
        plot=self.plot,
        on_plot=self.on_plot,
        save_dir=self.save_dir,
        names=self.names,
        prefix="Mask",
    )[2:]
    self.seg.nc = len(self.names)
    self.seg.update(results_mask)
    results_box = ap_per_class(
        tp,
        conf,
        pred_cls,
        target_cls,
        plot=self.plot,
        on_plot=self.on_plot,
        save_dir=self.save_dir,
        names=self.names,
        prefix="Box",
    )[2:]
    self.box.nc = len(self.names)
    self.box.update(results_box)



ultralytics.utils.metrics.PoseMetrics

垒球 SegmentMetrics

计算和汇总给定类别集的检测和姿势指标。

参数

名称 类型 说明 默认值
save_dir Path

保存输出绘图的目录路径。默认为当前目录。

Path('.')
plot bool

是否保存检测和分割图。默认为 "假"。

False
on_plot func

可选的回调,用于在渲染时传递绘图路径和数据。默认为 "无"。

None
names list

类名称列表。默认为空列表。

()

属性

名称 类型 说明
save_dir Path

保存输出绘图的目录路径。

plot bool

是否保存检测和分割图。

on_plot func

可选的回调,用于在渲染时传递绘图路径和数据。

names list

类名列表。

box Metric

用于计算方框检测指标的 Metric 类实例。

pose Metric

度量类的一个实例,用于计算掩膜分割度量。

speed dict

字典,用于存储推理不同阶段所用的时间。

方法

名称 说明
process

对给定的预测集进行度量处理。

mean_results

返回所有类别的检测和分割指标的平均值。

class_result

返回类别 i.

maps

返回 IoU 阈值从 0.50 到 0.95 的平均精度 (mAP) 分数。

fitness

返回拟合度得分,它是各项指标的单一加权组合。

ap_class_index

返回用于计算平均精度 (AP) 的类索引列表。

results_dict

返回包含所有检测和分割指标以及适合度得分的字典。

源代码 ultralytics/utils/metrics.py
class PoseMetrics(SegmentMetrics):
    """
    Calculates and aggregates detection and pose metrics over a given set of classes.

    Args:
        save_dir (Path): Path to the directory where the output plots should be saved. Default is the current directory.
        plot (bool): Whether to save the detection and segmentation plots. Default is False.
        on_plot (func): An optional callback to pass plots path and data when they are rendered. Defaults to None.
        names (list): List of class names. Default is an empty list.

    Attributes:
        save_dir (Path): Path to the directory where the output plots should be saved.
        plot (bool): Whether to save the detection and segmentation plots.
        on_plot (func): An optional callback to pass plots path and data when they are rendered.
        names (list): List of class names.
        box (Metric): An instance of the Metric class to calculate box detection metrics.
        pose (Metric): An instance of the Metric class to calculate mask segmentation metrics.
        speed (dict): Dictionary to store the time taken in different phases of inference.

    Methods:
        process(tp_m, tp_b, conf, pred_cls, target_cls): Processes metrics over the given set of predictions.
        mean_results(): Returns the mean of the detection and segmentation metrics over all the classes.
        class_result(i): Returns the detection and segmentation metrics of class `i`.
        maps: Returns the mean Average Precision (mAP) scores for IoU thresholds ranging from 0.50 to 0.95.
        fitness: Returns the fitness scores, which are a single weighted combination of metrics.
        ap_class_index: Returns the list of indices of classes used to compute Average Precision (AP).
        results_dict: Returns the dictionary containing all the detection and segmentation metrics and fitness score.
    """

    def __init__(self, save_dir=Path("."), plot=False, on_plot=None, names=()) -> None:
        """Initialize the PoseMetrics class with directory path, class names, and plotting options."""
        super().__init__(save_dir, plot, names)
        self.save_dir = save_dir
        self.plot = plot
        self.on_plot = on_plot
        self.names = names
        self.box = Metric()
        self.pose = Metric()
        self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
        self.task = "pose"

    def process(self, tp, tp_p, conf, pred_cls, target_cls):
        """
        Processes the detection and pose metrics over the given set of predictions.

        Args:
            tp (list): List of True Positive boxes.
            tp_p (list): List of True Positive keypoints.
            conf (list): List of confidence scores.
            pred_cls (list): List of predicted classes.
            target_cls (list): List of target classes.
        """

        results_pose = ap_per_class(
            tp_p,
            conf,
            pred_cls,
            target_cls,
            plot=self.plot,
            on_plot=self.on_plot,
            save_dir=self.save_dir,
            names=self.names,
            prefix="Pose",
        )[2:]
        self.pose.nc = len(self.names)
        self.pose.update(results_pose)
        results_box = ap_per_class(
            tp,
            conf,
            pred_cls,
            target_cls,
            plot=self.plot,
            on_plot=self.on_plot,
            save_dir=self.save_dir,
            names=self.names,
            prefix="Box",
        )[2:]
        self.box.nc = len(self.names)
        self.box.update(results_box)

    @property
    def keys(self):
        """Returns list of evaluation metric keys."""
        return [
            "metrics/precision(B)",
            "metrics/recall(B)",
            "metrics/mAP50(B)",
            "metrics/mAP50-95(B)",
            "metrics/precision(P)",
            "metrics/recall(P)",
            "metrics/mAP50(P)",
            "metrics/mAP50-95(P)",
        ]

    def mean_results(self):
        """Return the mean results of box and pose."""
        return self.box.mean_results() + self.pose.mean_results()

    def class_result(self, i):
        """Return the class-wise detection results for a specific class i."""
        return self.box.class_result(i) + self.pose.class_result(i)

    @property
    def maps(self):
        """Returns the mean average precision (mAP) per class for both box and pose detections."""
        return self.box.maps + self.pose.maps

    @property
    def fitness(self):
        """Computes classification metrics and speed using the `targets` and `pred` inputs."""
        return self.pose.fitness() + self.box.fitness()

    @property
    def curves(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return [
            "Precision-Recall(B)",
            "F1-Confidence(B)",
            "Precision-Confidence(B)",
            "Recall-Confidence(B)",
            "Precision-Recall(P)",
            "F1-Confidence(P)",
            "Precision-Confidence(P)",
            "Recall-Confidence(P)",
        ]

    @property
    def curves_results(self):
        """Returns dictionary of computed performance metrics and statistics."""
        return self.box.curves_results + self.pose.curves_results

curves property

返回用于访问特定度量曲线的曲线列表。

curves_results property

返回已计算性能指标和统计数据的字典。

fitness property

计算分类指标和速度。 targetspred 投入。

keys property

返回评估指标键的列表。

maps property

返回箱体和姿态检测的每类平均精度 (mAP)。

__init__(save_dir=Path('.'), plot=False, on_plot=None, names=())

使用目录路径、类名和绘图选项初始化 PoseMetrics 类。

源代码 ultralytics/utils/metrics.py
def __init__(self, save_dir=Path("."), plot=False, on_plot=None, names=()) -> None:
    """Initialize the PoseMetrics class with directory path, class names, and plotting options."""
    super().__init__(save_dir, plot, names)
    self.save_dir = save_dir
    self.plot = plot
    self.on_plot = on_plot
    self.names = names
    self.box = Metric()
    self.pose = Metric()
    self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
    self.task = "pose"

class_result(i)

返回特定类别 i 的类别检测结果。

源代码 ultralytics/utils/metrics.py
def class_result(self, i):
    """Return the class-wise detection results for a specific class i."""
    return self.box.class_result(i) + self.pose.class_result(i)

mean_results()

返回方框和姿势的平均结果。

源代码 ultralytics/utils/metrics.py
def mean_results(self):
    """Return the mean results of box and pose."""
    return self.box.mean_results() + self.pose.mean_results()

process(tp, tp_p, conf, pred_cls, target_cls)

根据给定的预测集处理检测和姿态指标。

参数

名称 类型 说明 默认值
tp list

真阳性方框列表。

所需
tp_p list

真实积极关键点列表。

所需
conf list

置信度列表。

所需
pred_cls list

预测等级列表。

所需
target_cls list

目标类列表。

所需
源代码 ultralytics/utils/metrics.py
def process(self, tp, tp_p, conf, pred_cls, target_cls):
    """
    Processes the detection and pose metrics over the given set of predictions.

    Args:
        tp (list): List of True Positive boxes.
        tp_p (list): List of True Positive keypoints.
        conf (list): List of confidence scores.
        pred_cls (list): List of predicted classes.
        target_cls (list): List of target classes.
    """

    results_pose = ap_per_class(
        tp_p,
        conf,
        pred_cls,
        target_cls,
        plot=self.plot,
        on_plot=self.on_plot,
        save_dir=self.save_dir,
        names=self.names,
        prefix="Pose",
    )[2:]
    self.pose.nc = len(self.names)
    self.pose.update(results_pose)
    results_box = ap_per_class(
        tp,
        conf,
        pred_cls,
        target_cls,
        plot=self.plot,
        on_plot=self.on_plot,
        save_dir=self.save_dir,
        names=self.names,
        prefix="Box",
    )[2:]
    self.box.nc = len(self.names)
    self.box.update(results_box)



ultralytics.utils.metrics.ClassifyMetrics

垒球 SimpleClass

用于计算分类指标的类,包括前 1 名和前 5 名的准确率。

属性

名称 类型 说明
top1 float

1 级精度

top5 float

前五名的准确度

speed Dict[str, float]

一个字典,包含管道中每个步骤所需的时间。

属性

fitness (浮点数):模型的适配度,等于前五名的准确率。 results_dict (Dict[str, Union[float, str]]):包含分类指标和适配度的字典。 keys (List[str]):results_dict 的键值列表。

方法

名称 说明
process

处理目标和预测,计算分类指标。

源代码 ultralytics/utils/metrics.py
class ClassifyMetrics(SimpleClass):
    """
    Class for computing classification metrics including top-1 and top-5 accuracy.

    Attributes:
        top1 (float): The top-1 accuracy.
        top5 (float): The top-5 accuracy.
        speed (Dict[str, float]): A dictionary containing the time taken for each step in the pipeline.

    Properties:
        fitness (float): The fitness of the model, which is equal to top-5 accuracy.
        results_dict (Dict[str, Union[float, str]]): A dictionary containing the classification metrics and fitness.
        keys (List[str]): A list of keys for the results_dict.

    Methods:
        process(targets, pred): Processes the targets and predictions to compute classification metrics.
    """

    def __init__(self) -> None:
        """Initialize a ClassifyMetrics instance."""
        self.top1 = 0
        self.top5 = 0
        self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
        self.task = "classify"

    def process(self, targets, pred):
        """Target classes and predicted classes."""
        pred, targets = torch.cat(pred), torch.cat(targets)
        correct = (targets[:, None] == pred).float()
        acc = torch.stack((correct[:, 0], correct.max(1).values), dim=1)  # (top1, top5) accuracy
        self.top1, self.top5 = acc.mean(0).tolist()

    @property
    def fitness(self):
        """Returns mean of top-1 and top-5 accuracies as fitness score."""
        return (self.top1 + self.top5) / 2

    @property
    def results_dict(self):
        """Returns a dictionary with model's performance metrics and fitness score."""
        return dict(zip(self.keys + ["fitness"], [self.top1, self.top5, self.fitness]))

    @property
    def keys(self):
        """Returns a list of keys for the results_dict property."""
        return ["metrics/accuracy_top1", "metrics/accuracy_top5"]

    @property
    def curves(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return []

    @property
    def curves_results(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return []

curves property

返回用于访问特定度量曲线的曲线列表。

curves_results property

返回用于访问特定度量曲线的曲线列表。

fitness property

返回前 1 名和前 5 名准确度的平均值作为适合度得分。

keys property

返回 results_dict 属性的键值列表。

results_dict property

返回包含模型性能指标和适应度得分的字典。

__init__()

初始化一个 ClassifyMetrics 实例。

源代码 ultralytics/utils/metrics.py
def __init__(self) -> None:
    """Initialize a ClassifyMetrics instance."""
    self.top1 = 0
    self.top5 = 0
    self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}
    self.task = "classify"

process(targets, pred)

目标班级和预测班级。

源代码 ultralytics/utils/metrics.py
def process(self, targets, pred):
    """Target classes and predicted classes."""
    pred, targets = torch.cat(pred), torch.cat(targets)
    correct = (targets[:, None] == pred).float()
    acc = torch.stack((correct[:, 0], correct.max(1).values), dim=1)  # (top1, top5) accuracy
    self.top1, self.top5 = acc.mean(0).tolist()



ultralytics.utils.metrics.OBBMetrics

垒球 SimpleClass

源代码 ultralytics/utils/metrics.py
class OBBMetrics(SimpleClass):
    def __init__(self, save_dir=Path("."), plot=False, on_plot=None, names=()) -> None:
        self.save_dir = save_dir
        self.plot = plot
        self.on_plot = on_plot
        self.names = names
        self.box = Metric()
        self.speed = {"preprocess": 0.0, "inference": 0.0, "loss": 0.0, "postprocess": 0.0}

    def process(self, tp, conf, pred_cls, target_cls):
        """Process predicted results for object detection and update metrics."""
        results = ap_per_class(
            tp,
            conf,
            pred_cls,
            target_cls,
            plot=self.plot,
            save_dir=self.save_dir,
            names=self.names,
            on_plot=self.on_plot,
        )[2:]
        self.box.nc = len(self.names)
        self.box.update(results)

    @property
    def keys(self):
        """Returns a list of keys for accessing specific metrics."""
        return ["metrics/precision(B)", "metrics/recall(B)", "metrics/mAP50(B)", "metrics/mAP50-95(B)"]

    def mean_results(self):
        """Calculate mean of detected objects & return precision, recall, mAP50, and mAP50-95."""
        return self.box.mean_results()

    def class_result(self, i):
        """Return the result of evaluating the performance of an object detection model on a specific class."""
        return self.box.class_result(i)

    @property
    def maps(self):
        """Returns mean Average Precision (mAP) scores per class."""
        return self.box.maps

    @property
    def fitness(self):
        """Returns the fitness of box object."""
        return self.box.fitness()

    @property
    def ap_class_index(self):
        """Returns the average precision index per class."""
        return self.box.ap_class_index

    @property
    def results_dict(self):
        """Returns dictionary of computed performance metrics and statistics."""
        return dict(zip(self.keys + ["fitness"], self.mean_results() + [self.fitness]))

    @property
    def curves(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return []

    @property
    def curves_results(self):
        """Returns a list of curves for accessing specific metrics curves."""
        return []

ap_class_index property

返回每个类别的平均精度指数。

curves property

返回用于访问特定度量曲线的曲线列表。

curves_results property

返回用于访问特定度量曲线的曲线列表。

fitness property

返回盒对象的适配性。

keys property

返回用于访问特定指标的键列表。

maps property

返回每个类别的平均精度 (mAP) 分数。

results_dict property

返回已计算性能指标和统计数据的字典。

class_result(i)

返回对象检测模型在特定类别上的性能评估结果。

源代码 ultralytics/utils/metrics.py
def class_result(self, i):
    """Return the result of evaluating the performance of an object detection model on a specific class."""
    return self.box.class_result(i)

mean_results()

计算检测对象的平均值,并返回精确度、召回率、mAP50 和 mAP50-95。

源代码 ultralytics/utils/metrics.py
def mean_results(self):
    """Calculate mean of detected objects & return precision, recall, mAP50, and mAP50-95."""
    return self.box.mean_results()

process(tp, conf, pred_cls, target_cls)

处理物体检测的预测结果并更新指标。

源代码 ultralytics/utils/metrics.py
def process(self, tp, conf, pred_cls, target_cls):
    """Process predicted results for object detection and update metrics."""
    results = ap_per_class(
        tp,
        conf,
        pred_cls,
        target_cls,
        plot=self.plot,
        save_dir=self.save_dir,
        names=self.names,
        on_plot=self.on_plot,
    )[2:]
    self.box.nc = len(self.names)
    self.box.update(results)



ultralytics.utils.metrics.bbox_ioa(box1, box2, iou=False, eps=1e-07)

给定方框 1 和方框 2,计算方框 2 面积的交点。方框的格式为 x1y1x2y2。

参数

名称 类型 说明 默认值
box1 ndarray

形状为 (n, 4) 的 numpy 数组,代表 n 个边界框。

所需
box2 ndarray

形状为 (m, 4) 的 numpy 数组,代表 m 个边界框。

所需
iou bool

如果为 True,则计算标准 iou,否则返回 inter_area/box2_area。

False
eps float

一个小值,以避免除以零。默认为 1e-7。

1e-07

返回:

类型 说明
ndarray

一个形状为 (n, m) 的 numpy 数组,代表方框 2 区域的交叉点。

源代码 ultralytics/utils/metrics.py
def bbox_ioa(box1, box2, iou=False, eps=1e-7):
    """
    Calculate the intersection over box2 area given box1 and box2. Boxes are in x1y1x2y2 format.

    Args:
        box1 (np.ndarray): A numpy array of shape (n, 4) representing n bounding boxes.
        box2 (np.ndarray): A numpy array of shape (m, 4) representing m bounding boxes.
        iou (bool): Calculate the standard iou if True else return inter_area/box2_area.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-7.

    Returns:
        (np.ndarray): A numpy array of shape (n, m) representing the intersection over box2 area.
    """

    # Get the coordinates of bounding boxes
    b1_x1, b1_y1, b1_x2, b1_y2 = box1.T
    b2_x1, b2_y1, b2_x2, b2_y2 = box2.T

    # Intersection area
    inter_area = (np.minimum(b1_x2[:, None], b2_x2) - np.maximum(b1_x1[:, None], b2_x1)).clip(0) * (
        np.minimum(b1_y2[:, None], b2_y2) - np.maximum(b1_y1[:, None], b2_y1)
    ).clip(0)

    # Box2 area
    area = (b2_x2 - b2_x1) * (b2_y2 - b2_y1)
    if iou:
        box1_area = (b1_x2 - b1_x1) * (b1_y2 - b1_y1)
        area = area + box1_area[:, None] - inter_area

    # Intersection over box2 area
    return inter_area / (area + eps)



ultralytics.utils.metrics.box_iou(box1, box2, eps=1e-07)

计算方框的交叉-联合(IoU)。预计两组方框都是 (x1, y1, x2, y2) 格式。 基于 https://github.com/pytorch/vision/blob/master/torchvision/ops/boxes.py

参数

名称 类型 说明 默认值
box1 Tensor

tensor 的形状 (N, 4) 代表 N 个边界框。

所需
box2 Tensor

tensor 的形状 (M, 4) 代表 M 个边界框。

所需
eps float

一个小值,以避免除以零。默认为 1e-7。

1e-07

返回:

类型 说明
Tensor

一个 NxMtensor ,包含方框 1 和方框 2 中每个元素的成对 IoU 值。

源代码 ultralytics/utils/metrics.py
def box_iou(box1, box2, eps=1e-7):
    """
    Calculate intersection-over-union (IoU) of boxes. Both sets of boxes are expected to be in (x1, y1, x2, y2) format.
    Based on https://github.com/pytorch/vision/blob/master/torchvision/ops/boxes.py

    Args:
        box1 (torch.Tensor): A tensor of shape (N, 4) representing N bounding boxes.
        box2 (torch.Tensor): A tensor of shape (M, 4) representing M bounding boxes.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-7.

    Returns:
        (torch.Tensor): An NxM tensor containing the pairwise IoU values for every element in box1 and box2.
    """

    # inter(N,M) = (rb(N,M,2) - lt(N,M,2)).clamp(0).prod(2)
    (a1, a2), (b1, b2) = box1.unsqueeze(1).chunk(2, 2), box2.unsqueeze(0).chunk(2, 2)
    inter = (torch.min(a2, b2) - torch.max(a1, b1)).clamp_(0).prod(2)

    # IoU = inter / (area1 + area2 - inter)
    return inter / ((a2 - a1).prod(2) + (b2 - b1).prod(2) - inter + eps)



ultralytics.utils.metrics.bbox_iou(box1, box2, xywh=True, GIoU=False, DIoU=False, CIoU=False, eps=1e-07)

计算方框 1(1,4)与方框 2(n,4)之间的 "联合相交"(IoU)。

参数

名称 类型 说明 默认值
box1 Tensor

tensor 表示形状为 (1, 4) 的单一边界框。

所需
box2 Tensor

代表 n 个边界框的tensor ,形状为 (n,4)。

所需
xywh bool

如果为 True,则输入框采用 (x, y, w, h) 格式。若为 False,则输入框格式为 (x1、y1、x2、y2)格式。默认为 True。

True
GIoU bool

如果为 True,则计算广义 IoU。默认为 "假"。

False
DIoU bool

如果为 True,则计算距离 IoU。默认为假。

False
CIoU bool

如果为 "true",则计算完整 IoU。默认为 "假"。

False
eps float

一个小值,以避免除以零。默认为 1e-7。

1e-07

返回:

类型 说明
Tensor

IoU、GIoU、DIoU 或 CIoU 值,具体取决于指定的标志。

源代码 ultralytics/utils/metrics.py
def bbox_iou(box1, box2, xywh=True, GIoU=False, DIoU=False, CIoU=False, eps=1e-7):
    """
    Calculate Intersection over Union (IoU) of box1(1, 4) to box2(n, 4).

    Args:
        box1 (torch.Tensor): A tensor representing a single bounding box with shape (1, 4).
        box2 (torch.Tensor): A tensor representing n bounding boxes with shape (n, 4).
        xywh (bool, optional): If True, input boxes are in (x, y, w, h) format. If False, input boxes are in
                               (x1, y1, x2, y2) format. Defaults to True.
        GIoU (bool, optional): If True, calculate Generalized IoU. Defaults to False.
        DIoU (bool, optional): If True, calculate Distance IoU. Defaults to False.
        CIoU (bool, optional): If True, calculate Complete IoU. Defaults to False.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-7.

    Returns:
        (torch.Tensor): IoU, GIoU, DIoU, or CIoU values depending on the specified flags.
    """

    # Get the coordinates of bounding boxes
    if xywh:  # transform from xywh to xyxy
        (x1, y1, w1, h1), (x2, y2, w2, h2) = box1.chunk(4, -1), box2.chunk(4, -1)
        w1_, h1_, w2_, h2_ = w1 / 2, h1 / 2, w2 / 2, h2 / 2
        b1_x1, b1_x2, b1_y1, b1_y2 = x1 - w1_, x1 + w1_, y1 - h1_, y1 + h1_
        b2_x1, b2_x2, b2_y1, b2_y2 = x2 - w2_, x2 + w2_, y2 - h2_, y2 + h2_
    else:  # x1, y1, x2, y2 = box1
        b1_x1, b1_y1, b1_x2, b1_y2 = box1.chunk(4, -1)
        b2_x1, b2_y1, b2_x2, b2_y2 = box2.chunk(4, -1)
        w1, h1 = b1_x2 - b1_x1, b1_y2 - b1_y1 + eps
        w2, h2 = b2_x2 - b2_x1, b2_y2 - b2_y1 + eps

    # Intersection area
    inter = (b1_x2.minimum(b2_x2) - b1_x1.maximum(b2_x1)).clamp_(0) * (
        b1_y2.minimum(b2_y2) - b1_y1.maximum(b2_y1)
    ).clamp_(0)

    # Union Area
    union = w1 * h1 + w2 * h2 - inter + eps

    # IoU
    iou = inter / union
    if CIoU or DIoU or GIoU:
        cw = b1_x2.maximum(b2_x2) - b1_x1.minimum(b2_x1)  # convex (smallest enclosing box) width
        ch = b1_y2.maximum(b2_y2) - b1_y1.minimum(b2_y1)  # convex height
        if CIoU or DIoU:  # Distance or Complete IoU https://arxiv.org/abs/1911.08287v1
            c2 = cw**2 + ch**2 + eps  # convex diagonal squared
            rho2 = ((b2_x1 + b2_x2 - b1_x1 - b1_x2) ** 2 + (b2_y1 + b2_y2 - b1_y1 - b1_y2) ** 2) / 4  # center dist ** 2
            if CIoU:  # https://github.com/Zzh-tju/DIoU-SSD-pytorch/blob/master/utils/box/box_utils.py#L47
                v = (4 / math.pi**2) * (torch.atan(w2 / h2) - torch.atan(w1 / h1)).pow(2)
                with torch.no_grad():
                    alpha = v / (v - iou + (1 + eps))
                return iou - (rho2 / c2 + v * alpha)  # CIoU
            return iou - rho2 / c2  # DIoU
        c_area = cw * ch + eps  # convex area
        return iou - (c_area - union) / c_area  # GIoU https://arxiv.org/pdf/1902.09630.pdf
    return iou  # IoU



ultralytics.utils.metrics.mask_iou(mask1, mask2, eps=1e-07)

计算面具 IoU。

参数

名称 类型 说明 默认值
mask1 Tensor

tensor 的形状 (N, n),其中 N 是地面实况对象的数量,n 是图像宽度和高度的乘积。 是图像宽度和高度的乘积。

所需
mask2 Tensor

tensor 的形状 (M,n),其中 M 是预测对象的数量,n 是图像宽度和高度的乘积。 是图像宽度和高度的乘积。

所需
eps float

一个小值,以避免除以零。默认为 1e-7。

1e-07

返回:

类型 说明
Tensor

tensor 的形状(N,M)代表掩码 IoU。

源代码 ultralytics/utils/metrics.py
def mask_iou(mask1, mask2, eps=1e-7):
    """
    Calculate masks IoU.

    Args:
        mask1 (torch.Tensor): A tensor of shape (N, n) where N is the number of ground truth objects and n is the
                        product of image width and height.
        mask2 (torch.Tensor): A tensor of shape (M, n) where M is the number of predicted objects and n is the
                        product of image width and height.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-7.

    Returns:
        (torch.Tensor): A tensor of shape (N, M) representing masks IoU.
    """
    intersection = torch.matmul(mask1, mask2.T).clamp_(0)
    union = (mask1.sum(1)[:, None] + mask2.sum(1)[None]) - intersection  # (area1 + area2) - intersection
    return intersection / (union + eps)



ultralytics.utils.metrics.kpt_iou(kpt1, kpt2, area, sigma, eps=1e-07)

计算对象关键点相似度 (OKS)。

参数

名称 类型 说明 默认值
kpt1 Tensor

tensor 的形状 (N, 17, 3) 代表地面真实关键点。

所需
kpt2 Tensor

tensor 的形状 (M,17,3) 代表预测的关键点。

所需
area Tensor

tensor 的形状 (N,) 代表来自地面实况的区域。

所需
sigma list

一个包含 17 个数值的列表,代表关键点刻度。

所需
eps float

一个小值,以避免除以零。默认为 1e-7。

1e-07

返回:

类型 说明
Tensor

tensor 的形状(N,M)代表关键点的相似性。

源代码 ultralytics/utils/metrics.py
def kpt_iou(kpt1, kpt2, area, sigma, eps=1e-7):
    """
    Calculate Object Keypoint Similarity (OKS).

    Args:
        kpt1 (torch.Tensor): A tensor of shape (N, 17, 3) representing ground truth keypoints.
        kpt2 (torch.Tensor): A tensor of shape (M, 17, 3) representing predicted keypoints.
        area (torch.Tensor): A tensor of shape (N,) representing areas from ground truth.
        sigma (list): A list containing 17 values representing keypoint scales.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-7.

    Returns:
        (torch.Tensor): A tensor of shape (N, M) representing keypoint similarities.
    """
    d = (kpt1[:, None, :, 0] - kpt2[..., 0]) ** 2 + (kpt1[:, None, :, 1] - kpt2[..., 1]) ** 2  # (N, M, 17)
    sigma = torch.tensor(sigma, device=kpt1.device, dtype=kpt1.dtype)  # (17, )
    kpt_mask = kpt1[..., 2] != 0  # (N, 17)
    e = d / (2 * sigma) ** 2 / (area[:, None, None] + eps) / 2  # from cocoeval
    # e = d / ((area[None, :, None] + eps) * sigma) ** 2 / 2  # from formula
    return (torch.exp(-e) * kpt_mask[:, None]).sum(-1) / (kpt_mask.sum(-1)[:, None] + eps)



ultralytics.utils.metrics._get_covariance_matrix(boxes)

从 obbs 生成协方差矩阵。

参数

名称 类型 说明 默认值
boxes Tensor

tensor 的形状 (N,5) 代表旋转边界框,格式为 xywhr。

所需

返回:

类型 说明
Tensor

与原始旋转边界框相对应的协方差矩阵。

源代码 ultralytics/utils/metrics.py
def _get_covariance_matrix(boxes):
    """
    Generating covariance matrix from obbs.

    Args:
        boxes (torch.Tensor): A tensor of shape (N, 5) representing rotated bounding boxes, with xywhr format.

    Returns:
        (torch.Tensor): Covariance metrixs corresponding to original rotated bounding boxes.
    """
    # Gaussian bounding boxes, ignore the center points (the first two columns) because they are not needed here.
    gbbs = torch.cat((torch.pow(boxes[:, 2:4], 2) / 12, boxes[:, 4:]), dim=-1)
    a, b, c = gbbs.split(1, dim=-1)
    return (
        a * torch.cos(c) ** 2 + b * torch.sin(c) ** 2,
        a * torch.sin(c) ** 2 + b * torch.cos(c) ** 2,
        a * torch.cos(c) * torch.sin(c) - b * torch.sin(c) * torch.cos(c),
    )



ultralytics.utils.metrics.probiou(obb1, obb2, CIoU=False, eps=1e-07)

计算定向边界框之间的概率 https://arxiv.org/pdf/2106.06072v1.pdf。

参数

名称 类型 说明 默认值
obb1 Tensor

tensor 的形状 (N, 5) 代表地面实况 obbs,格式为 xywhr。

所需
obb2 Tensor

tensor 形状 (N,5) 代表预测 obbs,格式为 xywhr。

所需
eps float

一个小值,以避免除以零。默认为 1e-7。

1e-07

返回:

类型 说明
Tensor

tensor 的形状(N, )代表 obb 相似性。

源代码 ultralytics/utils/metrics.py
def probiou(obb1, obb2, CIoU=False, eps=1e-7):
    """
    Calculate the prob iou between oriented bounding boxes, https://arxiv.org/pdf/2106.06072v1.pdf.

    Args:
        obb1 (torch.Tensor): A tensor of shape (N, 5) representing ground truth obbs, with xywhr format.
        obb2 (torch.Tensor): A tensor of shape (N, 5) representing predicted obbs, with xywhr format.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-7.

    Returns:
        (torch.Tensor): A tensor of shape (N, ) representing obb similarities.
    """
    x1, y1 = obb1[..., :2].split(1, dim=-1)
    x2, y2 = obb2[..., :2].split(1, dim=-1)
    a1, b1, c1 = _get_covariance_matrix(obb1)
    a2, b2, c2 = _get_covariance_matrix(obb2)

    t1 = (
        ((a1 + a2) * (torch.pow(y1 - y2, 2)) + (b1 + b2) * (torch.pow(x1 - x2, 2)))
        / ((a1 + a2) * (b1 + b2) - (torch.pow(c1 + c2, 2)) + eps)
    ) * 0.25
    t2 = (((c1 + c2) * (x2 - x1) * (y1 - y2)) / ((a1 + a2) * (b1 + b2) - (torch.pow(c1 + c2, 2)) + eps)) * 0.5
    t3 = (
        torch.log(
            ((a1 + a2) * (b1 + b2) - (torch.pow(c1 + c2, 2)))
            / (4 * torch.sqrt((a1 * b1 - torch.pow(c1, 2)).clamp_(0) * (a2 * b2 - torch.pow(c2, 2)).clamp_(0)) + eps)
            + eps
        )
        * 0.5
    )
    bd = t1 + t2 + t3
    bd = torch.clamp(bd, eps, 100.0)
    hd = torch.sqrt(1.0 - torch.exp(-bd) + eps)
    iou = 1 - hd
    if CIoU:  # only include the wh aspect ratio part
        w1, h1 = obb1[..., 2:4].split(1, dim=-1)
        w2, h2 = obb2[..., 2:4].split(1, dim=-1)
        v = (4 / math.pi**2) * (torch.atan(w2 / h2) - torch.atan(w1 / h1)).pow(2)
        with torch.no_grad():
            alpha = v / (v - iou + (1 + eps))
        return iou - v * alpha  # CIoU
    return iou



ultralytics.utils.metrics.batch_probiou(obb1, obb2, eps=1e-07)

计算定向边界框之间的概率 https://arxiv.org/pdf/2106.06072v1.pdf。

参数

名称 类型 说明 默认值
obb1 Tensor | ndarray

tensor 的形状 (N, 5) 代表地面实况 obbs,格式为 xywhr。

所需
obb2 Tensor | ndarray

tensor 形状 (M,5) 代表预测 obbs,格式为 xywhr。

所需
eps float

一个小值,以避免除以零。默认为 1e-7。

1e-07

返回:

类型 说明
Tensor

tensor 的形状(N,M)代表 obb 相似性。

源代码 ultralytics/utils/metrics.py
def batch_probiou(obb1, obb2, eps=1e-7):
    """
    Calculate the prob iou between oriented bounding boxes, https://arxiv.org/pdf/2106.06072v1.pdf.

    Args:
        obb1 (torch.Tensor | np.ndarray): A tensor of shape (N, 5) representing ground truth obbs, with xywhr format.
        obb2 (torch.Tensor | np.ndarray): A tensor of shape (M, 5) representing predicted obbs, with xywhr format.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-7.

    Returns:
        (torch.Tensor): A tensor of shape (N, M) representing obb similarities.
    """
    obb1 = torch.from_numpy(obb1) if isinstance(obb1, np.ndarray) else obb1
    obb2 = torch.from_numpy(obb2) if isinstance(obb2, np.ndarray) else obb2

    x1, y1 = obb1[..., :2].split(1, dim=-1)
    x2, y2 = (x.squeeze(-1)[None] for x in obb2[..., :2].split(1, dim=-1))
    a1, b1, c1 = _get_covariance_matrix(obb1)
    a2, b2, c2 = (x.squeeze(-1)[None] for x in _get_covariance_matrix(obb2))

    t1 = (
        ((a1 + a2) * (torch.pow(y1 - y2, 2)) + (b1 + b2) * (torch.pow(x1 - x2, 2)))
        / ((a1 + a2) * (b1 + b2) - (torch.pow(c1 + c2, 2)) + eps)
    ) * 0.25
    t2 = (((c1 + c2) * (x2 - x1) * (y1 - y2)) / ((a1 + a2) * (b1 + b2) - (torch.pow(c1 + c2, 2)) + eps)) * 0.5
    t3 = (
        torch.log(
            ((a1 + a2) * (b1 + b2) - (torch.pow(c1 + c2, 2)))
            / (4 * torch.sqrt((a1 * b1 - torch.pow(c1, 2)).clamp_(0) * (a2 * b2 - torch.pow(c2, 2)).clamp_(0)) + eps)
            + eps
        )
        * 0.5
    )
    bd = t1 + t2 + t3
    bd = torch.clamp(bd, eps, 100.0)
    hd = torch.sqrt(1.0 - torch.exp(-bd) + eps)
    return 1 - hd



ultralytics.utils.metrics.smooth_BCE(eps=0.1)

计算平滑正负二元交叉熵目标。

该函数根据给定的ε值计算正负标签平滑 BCE 目标。 有关实现细节,请参阅 https://github.com/ultralytics/yolov3/issues/238#issuecomment-598028441。

参数

名称 类型 说明 默认值
eps float

标签平滑的ε值。默认值为 0.1。

0.1

返回:

类型 说明
tuple

包含正负标签平滑 BCE 目标的元组。

源代码 ultralytics/utils/metrics.py
def smooth_BCE(eps=0.1):
    """
    Computes smoothed positive and negative Binary Cross-Entropy targets.

    This function calculates positive and negative label smoothing BCE targets based on a given epsilon value.
    For implementation details, refer to https://github.com/ultralytics/yolov3/issues/238#issuecomment-598028441.

    Args:
        eps (float, optional): The epsilon value for label smoothing. Defaults to 0.1.

    Returns:
        (tuple): A tuple containing the positive and negative label smoothing BCE targets.
    """
    return 1.0 - 0.5 * eps, 0.5 * eps



ultralytics.utils.metrics.smooth(y, f=0.05)

分数 f 的盒式滤波器

源代码 ultralytics/utils/metrics.py
def smooth(y, f=0.05):
    """Box filter of fraction f."""
    nf = round(len(y) * f * 2) // 2 + 1  # number of filter elements (must be odd)
    p = np.ones(nf // 2)  # ones padding
    yp = np.concatenate((p * y[0], y, p * y[-1]), 0)  # y padded
    return np.convolve(yp, np.ones(nf) / nf, mode="valid")  # y-smoothed



ultralytics.utils.metrics.plot_pr_curve(px, py, ap, save_dir=Path('pr_curve.png'), names=(), on_plot=None)

绘制精确度-召回曲线

源代码 ultralytics/utils/metrics.py
@plt_settings()
def plot_pr_curve(px, py, ap, save_dir=Path("pr_curve.png"), names=(), on_plot=None):
    """Plots a precision-recall curve."""
    fig, ax = plt.subplots(1, 1, figsize=(9, 6), tight_layout=True)
    py = np.stack(py, axis=1)

    if 0 < len(names) < 21:  # display per-class legend if < 21 classes
        for i, y in enumerate(py.T):
            ax.plot(px, y, linewidth=1, label=f"{names[i]} {ap[i, 0]:.3f}")  # plot(recall, precision)
    else:
        ax.plot(px, py, linewidth=1, color="grey")  # plot(recall, precision)

    ax.plot(px, py.mean(1), linewidth=3, color="blue", label="all classes %.3f mAP@0.5" % ap[:, 0].mean())
    ax.set_xlabel("Recall")
    ax.set_ylabel("Precision")
    ax.set_xlim(0, 1)
    ax.set_ylim(0, 1)
    ax.legend(bbox_to_anchor=(1.04, 1), loc="upper left")
    ax.set_title("Precision-Recall Curve")
    fig.savefig(save_dir, dpi=250)
    plt.close(fig)
    if on_plot:
        on_plot(save_dir)



ultralytics.utils.metrics.plot_mc_curve(px, py, save_dir=Path('mc_curve.png'), names=(), xlabel='Confidence', ylabel='Metric', on_plot=None)

绘制度量置信度曲线。

源代码 ultralytics/utils/metrics.py
@plt_settings()
def plot_mc_curve(px, py, save_dir=Path("mc_curve.png"), names=(), xlabel="Confidence", ylabel="Metric", on_plot=None):
    """Plots a metric-confidence curve."""
    fig, ax = plt.subplots(1, 1, figsize=(9, 6), tight_layout=True)

    if 0 < len(names) < 21:  # display per-class legend if < 21 classes
        for i, y in enumerate(py):
            ax.plot(px, y, linewidth=1, label=f"{names[i]}")  # plot(confidence, metric)
    else:
        ax.plot(px, py.T, linewidth=1, color="grey")  # plot(confidence, metric)

    y = smooth(py.mean(0), 0.05)
    ax.plot(px, y, linewidth=3, color="blue", label=f"all classes {y.max():.2f} at {px[y.argmax()]:.3f}")
    ax.set_xlabel(xlabel)
    ax.set_ylabel(ylabel)
    ax.set_xlim(0, 1)
    ax.set_ylim(0, 1)
    ax.legend(bbox_to_anchor=(1.04, 1), loc="upper left")
    ax.set_title(f"{ylabel}-Confidence Curve")
    fig.savefig(save_dir, dpi=250)
    plt.close(fig)
    if on_plot:
        on_plot(save_dir)



ultralytics.utils.metrics.compute_ap(recall, precision)

根据召回率和精度曲线计算平均精度 (AP)。

参数

名称 类型 说明 默认值
recall list

召回曲线

所需
precision list

精度曲线

所需

返回:

类型 说明
float

平均精度。

ndarray

精密包络曲线

ndarray

修改后的召回曲线,在开始和结束处添加了哨点值。

源代码 ultralytics/utils/metrics.py
def compute_ap(recall, precision):
    """
    Compute the average precision (AP) given the recall and precision curves.

    Args:
        recall (list): The recall curve.
        precision (list): The precision curve.

    Returns:
        (float): Average precision.
        (np.ndarray): Precision envelope curve.
        (np.ndarray): Modified recall curve with sentinel values added at the beginning and end.
    """

    # Append sentinel values to beginning and end
    mrec = np.concatenate(([0.0], recall, [1.0]))
    mpre = np.concatenate(([1.0], precision, [0.0]))

    # Compute the precision envelope
    mpre = np.flip(np.maximum.accumulate(np.flip(mpre)))

    # Integrate area under curve
    method = "interp"  # methods: 'continuous', 'interp'
    if method == "interp":
        x = np.linspace(0, 1, 101)  # 101-point interp (COCO)
        ap = np.trapz(np.interp(x, mrec, mpre), x)  # integrate
    else:  # 'continuous'
        i = np.where(mrec[1:] != mrec[:-1])[0]  # points where x-axis (recall) changes
        ap = np.sum((mrec[i + 1] - mrec[i]) * mpre[i + 1])  # area under curve

    return ap, mpre, mrec



ultralytics.utils.metrics.ap_per_class(tp, conf, pred_cls, target_cls, plot=False, on_plot=None, save_dir=Path(), names=(), eps=1e-16, prefix='')

计算对象检测评估的每类平均精度。

参数

名称 类型 说明 默认值
tp ndarray

表示检测正确(True)或不正确(False)的二进制数组。

所需
conf ndarray

检测结果的置信度分数阵列。

所需
pred_cls ndarray

检测结果的预测类别阵列。

所需
target_cls ndarray

检测结果的真实类别数组。

所需
plot bool

是否绘制 PR 曲线。默认为 "假"。

False
on_plot func

回调,用于在渲染时传递绘图路径和数据。默认为 "无"。

None
save_dir Path

保存 PR 曲线的目录。默认为空路径。

Path()
names tuple

用于绘制 PR 曲线的类名元组。默认为空元组。

()
eps float

一个小值,以避免除以零。默认为 1e-16。

1e-16
prefix str

保存绘图文件的前缀字符串。默认为空字符串。

''

返回:

类型 说明
tuple

由六个数组和一个唯一类数组组成的元组,其中 tp(ndarray):在每个类别的最大 F1 指标给出的阈值处的真阳性计数。形状:(nc,)。 fp(np.ndarray):每个类别在最大 F1 指标给定的阈值下的假阳性计数。形状:(nc, )。 p(np.ndarray):每个类别在最大 F1 指标给定的阈值下的精度值。形状:(nc, )。 r(np.ndarray):每个类别在最大 F1 指标给出的阈值处的召回值。形状:(nc,)。 f1 (np.ndarray):每个类别在最大 F1 指标给定的阈值处的 F1 分数值。形状:(nc, )。 ap(np.ndarray):每个类别在不同 IoU 阈值下的平均精度。形状:(nc, 10)。 unique_classes (np.ndarray):有数据的唯一类别数组。形状:(nc,)。 p_curve (np.ndarray):每个类别的精度曲线。形状:(nc, 1000)。 r_curve (np.ndarray):每个类别的召回率曲线。形状:(nc, 1000)。 f1_curve (np.ndarray):每个类别的 F1 分数曲线。形状:(nc,1000)。 x(np.ndarray):曲线的 X 轴值。形状:(1000,)。 prec_values:精度值:mAP@0.5 中每个类别的精度值。形状:(nc, 1000)。

源代码 ultralytics/utils/metrics.py
def ap_per_class(
    tp, conf, pred_cls, target_cls, plot=False, on_plot=None, save_dir=Path(), names=(), eps=1e-16, prefix=""
):
    """
    Computes the average precision per class for object detection evaluation.

    Args:
        tp (np.ndarray): Binary array indicating whether the detection is correct (True) or not (False).
        conf (np.ndarray): Array of confidence scores of the detections.
        pred_cls (np.ndarray): Array of predicted classes of the detections.
        target_cls (np.ndarray): Array of true classes of the detections.
        plot (bool, optional): Whether to plot PR curves or not. Defaults to False.
        on_plot (func, optional): A callback to pass plots path and data when they are rendered. Defaults to None.
        save_dir (Path, optional): Directory to save the PR curves. Defaults to an empty path.
        names (tuple, optional): Tuple of class names to plot PR curves. Defaults to an empty tuple.
        eps (float, optional): A small value to avoid division by zero. Defaults to 1e-16.
        prefix (str, optional): A prefix string for saving the plot files. Defaults to an empty string.

    Returns:
        (tuple): A tuple of six arrays and one array of unique classes, where:
            tp (np.ndarray): True positive counts at threshold given by max F1 metric for each class.Shape: (nc,).
            fp (np.ndarray): False positive counts at threshold given by max F1 metric for each class. Shape: (nc,).
            p (np.ndarray): Precision values at threshold given by max F1 metric for each class. Shape: (nc,).
            r (np.ndarray): Recall values at threshold given by max F1 metric for each class. Shape: (nc,).
            f1 (np.ndarray): F1-score values at threshold given by max F1 metric for each class. Shape: (nc,).
            ap (np.ndarray): Average precision for each class at different IoU thresholds. Shape: (nc, 10).
            unique_classes (np.ndarray): An array of unique classes that have data. Shape: (nc,).
            p_curve (np.ndarray): Precision curves for each class. Shape: (nc, 1000).
            r_curve (np.ndarray): Recall curves for each class. Shape: (nc, 1000).
            f1_curve (np.ndarray): F1-score curves for each class. Shape: (nc, 1000).
            x (np.ndarray): X-axis values for the curves. Shape: (1000,).
            prec_values: Precision values at mAP@0.5 for each class. Shape: (nc, 1000).
    """

    # Sort by objectness
    i = np.argsort(-conf)
    tp, conf, pred_cls = tp[i], conf[i], pred_cls[i]

    # Find unique classes
    unique_classes, nt = np.unique(target_cls, return_counts=True)
    nc = unique_classes.shape[0]  # number of classes, number of detections

    # Create Precision-Recall curve and compute AP for each class
    x, prec_values = np.linspace(0, 1, 1000), []

    # Average precision, precision and recall curves
    ap, p_curve, r_curve = np.zeros((nc, tp.shape[1])), np.zeros((nc, 1000)), np.zeros((nc, 1000))
    for ci, c in enumerate(unique_classes):
        i = pred_cls == c
        n_l = nt[ci]  # number of labels
        n_p = i.sum()  # number of predictions
        if n_p == 0 or n_l == 0:
            continue

        # Accumulate FPs and TPs
        fpc = (1 - tp[i]).cumsum(0)
        tpc = tp[i].cumsum(0)

        # Recall
        recall = tpc / (n_l + eps)  # recall curve
        r_curve[ci] = np.interp(-x, -conf[i], recall[:, 0], left=0)  # negative x, xp because xp decreases

        # Precision
        precision = tpc / (tpc + fpc)  # precision curve
        p_curve[ci] = np.interp(-x, -conf[i], precision[:, 0], left=1)  # p at pr_score

        # AP from recall-precision curve
        for j in range(tp.shape[1]):
            ap[ci, j], mpre, mrec = compute_ap(recall[:, j], precision[:, j])
            if plot and j == 0:
                prec_values.append(np.interp(x, mrec, mpre))  # precision at mAP@0.5

    prec_values = np.array(prec_values)  # (nc, 1000)

    # Compute F1 (harmonic mean of precision and recall)
    f1_curve = 2 * p_curve * r_curve / (p_curve + r_curve + eps)
    names = [v for k, v in names.items() if k in unique_classes]  # list: only classes that have data
    names = dict(enumerate(names))  # to dict
    if plot:
        plot_pr_curve(x, prec_values, ap, save_dir / f"{prefix}PR_curve.png", names, on_plot=on_plot)
        plot_mc_curve(x, f1_curve, save_dir / f"{prefix}F1_curve.png", names, ylabel="F1", on_plot=on_plot)
        plot_mc_curve(x, p_curve, save_dir / f"{prefix}P_curve.png", names, ylabel="Precision", on_plot=on_plot)
        plot_mc_curve(x, r_curve, save_dir / f"{prefix}R_curve.png", names, ylabel="Recall", on_plot=on_plot)

    i = smooth(f1_curve.mean(0), 0.1).argmax()  # max F1 index
    p, r, f1 = p_curve[:, i], r_curve[:, i], f1_curve[:, i]  # max-F1 precision, recall, F1 values
    tp = (r * nt).round()  # true positives
    fp = (tp / (p + eps) - tp).round()  # false positives
    return tp, fp, p, r, f1, ap, unique_classes.astype(int), p_curve, r_curve, f1_curve, x, prec_values





创建于 2023-11-12,更新于 2024-01-05
作者:glenn-jocher(4),Laughing-q(1)