code: def test_eval_mstest(self):
      cfg = load_config(self.mstest_cfg_file)
      trainer = Trainer(cfg, mode="eval")
  
      cfg.weights = "https://paddledet.bj.bcebos.com/models/faster_rcnn_r34_fpn_1x_coco.pdparams"
      trainer.load_weights(cfg.weights)
  
      trainer.evaluate()
  
file_path: PaddleDetection/ppdet/modeling/tests/test_mstest.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import unittest
  from ppdet.core.workspace import load_config
  from ppdet.engine import Trainer
label_desc: Use image node_id 3 for calling the TestMultiScaleInference obj's underlying member method code with example usage: obj.test_eval_mstest() without return types