code: def test_step(self, batch, batch_idx):
      loss = self._step(batch, False)
      self.log("test_loss", loss)
      return loss
  
file_path: SynapseML/deep-learning/src/main/python/synapse/ml/dl/LitDeepTextModel.py
imports: import inspect
  import pytorch_lightning
  import torch
  import torch.nn.functional
  import torch.optim
  from pytorch_lightning.utilities import _module_available
label_desc: Use image node_id 11 for calling the LitDeepTextModel obj's underlying member method code with example usage: obj.test_step(batch, batch_idx) and returns: loss