(boxes, min_size)
return keep
filter small boxes.
    :param boxes: [N, 4* num_classes]
    :param min_size:
    :return: keep:
filter small boxes.
    :param boxes: [N, 4* num_classes]
    :param min_size:
    :return: keep:
filter small boxes . : param boxes : [ N 4 * num_classes ] : param min_size : : return : keep :
def filter_boxes(boxes, min_size):
    """
    filter small boxes.
    :param boxes: [N, 4* num_classes]
    :param min_size:
    :return: keep:
    """
    ws = boxes[:, 2] - boxes[:, 0] + 1
    hs = boxes[:, 3] - boxes[:, 1] + 1
    keep = np.where((ws >= min_size) & (hs >= min_size))[0]
    return keep
def filter_boxes ( boxes , min_size ) : ws = boxes [ : , 2 ] - boxes [ : , 0 ] + 1 hs = boxes [ : , 3 ] - boxes [ : , 1 ] + 1 keep = np . where ( ( ws >= min_size ) & ( hs >= min_size ) ) [ 0 ] return keep