(bbox, ratio, featmap_size=None)
return (x1, y1, x2, y2)
Calculate a proportional bbox region.

    The bbox center are fixed and the new h' and w' is h * ratio and w * ratio.

    Args:
        bbox (Tensor): Bboxes to calculate regions, shape (n, 4)
        ratio (float): Ratio of the output region.
        featmap_size (tuple): Feature map size used for clipping the boundary.

    Returns:
        tuple: x1, y1, x2, y2
Calculate a proportional bbox region.
Calculate a proportional bbox region .
def calc_region(bbox, ratio, featmap_size=None):
    """Calculate a proportional bbox region.

    The bbox center are fixed and the new h' and w' is h * ratio and w * ratio.

    Args:
        bbox (Tensor): Bboxes to calculate regions, shape (n, 4)
        ratio (float): Ratio of the output region.
        featmap_size (tuple): Feature map size used for clipping the boundary.

    Returns:
        tuple: x1, y1, x2, y2
    """
    x1 = torch.round((1 - ratio) * bbox[0] + ratio * bbox[2]).long()
    y1 = torch.round((1 - ratio) * bbox[1] + ratio * bbox[3]).long()
    x2 = torch.round(ratio * bbox[0] + (1 - ratio) * bbox[2]).long()
    y2 = torch.round(ratio * bbox[1] + (1 - ratio) * bbox[3]).long()
    if featmap_size is not None:
        x1 = x1.clamp(min=0, max=featmap_size[1] - 1)
        y1 = y1.clamp(min=0, max=featmap_size[0] - 1)
        x2 = x2.clamp(min=0, max=featmap_size[1] - 1)
        y2 = y2.clamp(min=0, max=featmap_size[0] - 1)
    return (x1, y1, x2, y2)
def calc_region ( bbox , ratio , featmap_size = None ) : x1 = torch . round ( ( 1 - ratio ) * bbox [ 0 ] + ratio * bbox [ 2 ] ) . long ( ) y1 = torch . round ( ( 1 - ratio ) * bbox [ 1 ] + ratio * bbox [ 3 ] ) . long ( ) x2 = torch . round ( ratio * bbox [ 0 ] + ( 1 - ratio ) * bbox [ 2 ] ) . long ( ) y2 = torch . round ( ratio * bbox [ 1 ] + ( 1 - ratio ) * bbox [ 3 ] ) . long ( ) if featmap_size is not None : x1 = x1 . clamp ( min = 0 , max = featmap_size [ 1 ] - 1 ) y1 = y1 . clamp ( min = 0 , max = featmap_size [ 0 ] - 1 ) x2 = x2 . clamp ( min = 0 , max = featmap_size [ 1 ] - 1 ) y2 = y2 . clamp ( min = 0 , max = featmap_size [ 0 ] - 1 ) return ( x1 , y1 , x2 , y2 )