code: def test_build_soft_target_cross_entropy(self):
      config = self._get_config()
      crit = build_loss(config)
      self.assertTrue(isinstance(crit, SoftTargetCrossEntropyLoss))
      self.assertEqual(crit._ignore_index, -1)
      self.assertEqual(crit._reduction, "mean")
  
file_path: ClassyVision/test/losses_soft_target_cross_entropy_loss_test.py
imports: import copy
  import unittest
  import torch
  from classy_vision.losses import build_loss, SoftTargetCrossEntropyLoss
label_desc: Use image node_id 5 for calling the TestSoftTargetCrossEntropyLoss obj's underlying member method code with example usage: obj.test_build_soft_target_cross_entropy() without return types