def bbox_xyxy2cs(bbox: np.ndarray,
                 padding: float = 1.) -> Tuple[np.ndarray, np.ndarray]:
    """Transform the bbox format from (x,y,w,h) into (center, scale)

    Args:
        bbox (ndarray): Bounding box(es) in shape (4,) or (n, 4), formatted
            as (left, top, right, bottom)
        padding (float): BBox padding factor that will be multilied to scale.
            Default: 1.0

    Returns:
        tuple: A tuple containing center and scale.
        - np.ndarray[float32]: Center (x, y) of the bbox in shape (2,) or
            (n, 2)
        - np.ndarray[float32]: Scale (w, h) of the bbox in shape (2,) or
            (n, 2)
    """
    # convert single bbox from (4, ) to (1, 4)
    dim = bbox.ndim
    if dim == 1:
        bbox = bbox[None, :]

    x1, y1, x2, y2 = np.hsplit(bbox, [1, 2, 3])
    center = np.hstack([x1 + x2, y1 + y2]) * 0.5
    scale = np.hstack([x2 - x1, y2 - y1]) * padding

    if dim == 1:
        center = center[0]
        scale = scale[0]

    return center, scale
Transform the bbox format from (x,y,w,h) into (center, scale)

    Args:
        bbox (ndarray): Bounding box(es) in shape (4,) or (n, 4), formatted
            as (left, top, right, bottom)
        padding (float): BBox padding factor that will be multilied to scale.
            Default: 1.0

    Returns:
        tuple: A tuple containing center and scale.
        - np.ndarray[float32]: Center (x, y) of the bbox in shape (2,) or
            (n, 2)
        - np.ndarray[float32]: Scale (w, h) of the bbox in shape (2,) or
            (n, 2)
    
mmpose/mmpose/structures/bbox/transforms.py