code: def initTestCase(self):
      self.b = 5
      self.h = 38
      self.w = 38
      self.anchors = [
          [10, 13],
          [16, 30],
          [33, 23],
          [30, 61],
          [62, 45],
          [59, 119],
          [116, 90],
          [156, 198],
          [373, 326],
      ]
      self.anchor_mask = [3, 4, 5]
      self.na = len(self.anchor_mask)
      self.class_num = 80
      self.ignore_thresh = 0.7
      self.downsample_ratio = 16
      self.x_shape = (
          self.b,
          len(self.anchor_mask) * (5 + self.class_num),
          self.h,
          self.w,
      )
      self.gtbox_shape = (self.b, 40, 4)
      self.gtscore = True
      self.use_label_smooth = False
      self.scale_x_y = 1.2
  
imports: from __future__ import division
  import unittest
  import paddle
  import paddle.nn.functional
  import os
  import sys
  from ppdet.modeling.losses import YOLOv3Loss
  from ppdet.data.transform.op_helper import jaccard_overlap
  from ppdet.modeling.bbox_utils import iou_similarity
  import numpy
label_desc: Use image node_id 1 for calling the TestYolov3LossWithScaleXY obj's underlying member method code with example usage: obj.initTestCase() without return types