code: def zero_grad(self, set_to_none=False):
      self.optimizer.zero_grad(set_to_none)
  
file_path: speechbrain/recipes/MultiWOZ/response_generation/llama2/train_with_llama2.py
imports: import sys
  import speechbrain
  import torch
  from itertools import chain
  from hyperpyyaml import load_hyperpyyaml
  from speechbrain.utils.distributed import run_on_main
  import math
  from speechbrain.dataio.batch import PaddedBatch
label_desc: Use image node_id 7 for calling the ResGenBrain obj's underlying member method code with example usage: obj.zero_grad(set_to_none) without return types