code: def reset_cost(self, user):
      self.user_dict[user]["current_cost"] = 0
      self.user_dict[user]["model_cost"] = {}
      return {"user": self.user_dict[user]}
  
imports: import os, json, time
  import litellm
  from litellm.utils import ModelResponse
  import requests, threading
  from typing import Optional, Union, Literal
label_desc: Use image node_id 12 for calling the BudgetManager obj's underlying member method code with example usage: obj.reset_cost(user) and returns: dict