code: def _freeze_model(self):
      logging.info("Freezing model trunk...")
      for param in self.base_model.parameters():
          param.requires_grad = False
  
file_path: vissl/vissl/models/trunks/feature_extractor.py
imports: import logging
  import torch
  import torch.nn
  from vissl.config import AttrDict
  from vissl.models.model_helpers import Identity
  from vissl.models.trunks import get_model_trunk
label_desc: Use image node_id 3 for calling the FeatureExtractorModel obj's underlying member method code with example usage: obj._freeze_model() without return types