code: def validation_step(self, batch, _):
      output = self.layer(batch)
      loss = self.loss(batch, output)
      self.validation_step_outputs.append(loss)
      return loss
  
file_path: wandb/tests/functional_tests/t0_main/lightning/pl_base.py
imports: import torch
  from lightning import LightningModule
  from torch.utils.data import Dataset
label_desc: Use image node_id 7 for calling the BoringModel obj's underlying member method code with example usage: obj.validation_step(batch, _) and returns: loss