Reference for `ultralytics/models/nas/predict.py`

Note

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ultralytics.models.nas.predict.NASPredictor

NASPredictor(cfg=DEFAULT_CFG, overrides=None, _callbacks=None)

Bases: DetectionPredictor

Ultralytics YOLO NAS Predictor for object detection.

This class extends the DetectionPredictor from Ultralytics engine and is responsible for post-processing the raw predictions generated by the YOLO NAS models. It applies operations like non-maximum suppression and scaling the bounding boxes to fit the original image dimensions.

Attributes:

Name	Type	Description
`args`	`Namespace`	Namespace containing various configurations for post-processing including confidence threshold, IoU threshold, agnostic NMS flag, maximum detections, and class filtering options.
`model`	`Module`	The YOLO NAS model used for inference.
`batch`	`list`	Batch of inputs for processing.

Examples:

>>> from ultralytics import NAS
>>> model = NAS("yolo_nas_s")
>>> predictor = model.predictor

Assume that raw_preds, img, orig_imgs are available

>>> results = predictor.postprocess(raw_preds, img, orig_imgs)

Notes

Typically, this class is not instantiated directly. It is used internally within the NAS class.

Source code in ultralytics/engine/predictor.py

def __init__(self, cfg=DEFAULT_CFG, overrides=None, _callbacks=None):
    """
    Initialize the BasePredictor class.

    Args:
        cfg (str | dict): Path to a configuration file or a configuration dictionary.
        overrides (dict | None): Configuration overrides.
        _callbacks (dict | None): Dictionary of callback functions.
    """
    self.args = get_cfg(cfg, overrides)
    self.save_dir = get_save_dir(self.args)
    if self.args.conf is None:
        self.args.conf = 0.25  # default conf=0.25
    self.done_warmup = False
    if self.args.show:
        self.args.show = check_imshow(warn=True)

    # Usable if setup is done
    self.model = None
    self.data = self.args.data  # data_dict
    self.imgsz = None
    self.device = None
    self.dataset = None
    self.vid_writer = {}  # dict of {save_path: video_writer, ...}
    self.plotted_img = None
    self.source_type = None
    self.seen = 0
    self.windows = []
    self.batch = None
    self.results = None
    self.transforms = None
    self.callbacks = _callbacks or callbacks.get_default_callbacks()
    self.txt_path = None
    self._lock = threading.Lock()  # for automatic thread-safe inference
    callbacks.add_integration_callbacks(self)

postprocess

postprocess(preds_in, img, orig_imgs)

Postprocess NAS model predictions to generate final detection results.

This method takes raw predictions from a YOLO NAS model, converts bounding box formats, and applies post-processing operations to generate the final detection results compatible with Ultralytics result visualization and analysis tools.

Parameters:

Name	Type	Description	Default
`preds_in`	`list`	Raw predictions from the NAS model, typically containing bounding boxes and class scores.	required
`img`	`Tensor`	Input image tensor that was fed to the model, with shape (B, C, H, W).	required
`orig_imgs`	`list \| Tensor \| ndarray`	Original images before preprocessing, used for scaling coordinates back to original dimensions.	required

Returns:

Type	Description
`list`	List of Results objects containing the processed predictions for each image in the batch.

Examples:

>>> predictor = NAS("yolo_nas_s").predictor
>>> results = predictor.postprocess(raw_preds, img, orig_imgs)

Source code in ultralytics/models/nas/predict.py

def postprocess(self, preds_in, img, orig_imgs):
    """
    Postprocess NAS model predictions to generate final detection results.

    This method takes raw predictions from a YOLO NAS model, converts bounding box formats, and applies
    post-processing operations to generate the final detection results compatible with Ultralytics
    result visualization and analysis tools.

    Args:
        preds_in (list): Raw predictions from the NAS model, typically containing bounding boxes and class scores.
        img (torch.Tensor): Input image tensor that was fed to the model, with shape (B, C, H, W).
        orig_imgs (list | torch.Tensor | np.ndarray): Original images before preprocessing, used for scaling
            coordinates back to original dimensions.

    Returns:
        (list): List of Results objects containing the processed predictions for each image in the batch.

    Examples:
        >>> predictor = NAS("yolo_nas_s").predictor
        >>> results = predictor.postprocess(raw_preds, img, orig_imgs)
    """
    boxes = ops.xyxy2xywh(preds_in[0][0])
    preds = torch.cat((boxes, preds_in[0][1]), -1).permute(0, 2, 1)  # concatenate with class scores
    return super().postprocess(preds, img, orig_imgs)

📅 Created 1 year ago ✏️ Updated 8 months ago

Reference for ultralytics/models/nas/predict.py

ultralytics.models.nas.predict.NASPredictor

postprocess

Reference for `ultralytics/models/nas/predict.py`