Reference for ultralytics/models/nas/val.py#

class NASValidator(DetectionValidator):
    """Ultralytics YOLO NAS Validator for object detection.

    Extends DetectionValidator from the Ultralytics models package and is designed to post-process the raw predictions
    generated by YOLO NAS models. It performs non-maximum suppression to remove overlapping and low-confidence boxes,
    ultimately producing the final detections.

    Attributes:
        args (SimpleNamespace): Namespace containing various configurations for post-processing, such as confidence and
            IoU thresholds.

    Examples:
        >>> from ultralytics import NAS
        >>> model = NAS("yolo_nas_s")
        >>> metrics = model.val(data="coco8.yaml")  # runs NASValidator internally

    Notes:
        This class is generally not instantiated directly but is used internally within the NAS class.
    """

def postprocess(self, preds_in):
    """Apply Non-maximum suppression to prediction outputs."""
    boxes = ops.xyxy2xywh(preds_in[0][0])  # Convert bounding box format from xyxy to xywh
    preds = torch.cat((boxes, preds_in[0][1]), -1).permute(0, 2, 1)  # Concatenate boxes with scores and permute
    return super().postprocess(preds)