code: def validate(self):
      with torch.no_grad():
          return self._test(self.valid_loader)
  
file_path: audio/examples/source_separation/conv_tasnet/trainer.py
imports: import time
  from collections import namedtuple
  from typing import Tuple
  import torch
  import torch.distributed
  from utils import dist_utils, metrics
label_desc: Use image node_id 4 for calling the Trainer obj's underlying member method code with example usage: obj.validate() and returns: self