code: def set_default_quotas(account: Account):
      """Impose the `DEFAULT_QUOTAS` on the `account` if they don't exist, but don't override anything."""
      for model_group, default_quotas in DEFAULT_QUOTAS.items():
          model_group_usages = account.usages.get(model_group)
          if model_group_usages is None:
              model_group_usages = account.usages[model_group] = {}
          for granularity, quota in default_quotas.items():
              usage = model_group_usages.get(granularity)
              if usage is None:
                  usage = model_group_usages[granularity] = Usage()
                  usage.quota = quota
  
imports: import copy
  import datetime
  import random
  import string
  from typing import Dict, Optional, Callable, List
  from dacite import from_dict
  from dataclasses import asdict, dataclass, field
  from sqlitedict import SqliteDict
  from helm.common.authentication import Authentication
  from helm.common.general import hlog
label_desc: Use image node_id 1 for calling a global function with example usage: set_default_quotas(account) without return types