code: def set_grad_none(self):
      self.saved_grad.set_null()
  
file_path: colossalai/colossalai/legacy/zero/sharded_param/sharded_param.py
imports: from typing import List, Optional, Tuple
  import torch
  from colossalai.legacy.zero.gemini.stateful_tensor import StatefulTensor, TensorState
  from colossalai.legacy.zero.gemini.tensor_utils import colo_tensor_mem_usage
  from .sharded_tensor import ShardedTensor
label_desc: Use image node_id 4 for calling the ShardedParamV2 obj's underlying member method code with example usage: obj.set_grad_none() without return types