code: def load(
      self,
      source: Union[str, dict],
      internal_state_data: Optional[dict] = None,
  ):
      data = json.loads(source)
      self.__dict__.update(data)
  
imports: import json
  import uuid
  from datetime import timedelta
  from typing import Tuple, Union, Optional, Sequence
  import pytest
  from golem.utilities.serializable import Serializable
  from fedot.remote.infrastructure.clients.client import Client
  from fedot.remote.remote_evaluator import RemoteEvaluator, RemoteTaskParams
label_desc: Use image node_id 4 for calling the MockSerializableGraph obj's underlying member method code with example usage: obj.load(source, internal_state_data) without return types