code: def defaults(cls):
      return dict(
          series_preferences=[],
          sub_series_preferences=dict(),
          chart_type=0,
          errors=[],
      )
  
imports: from fastapi import Request
  from fastapi.responses import JSONResponse
  from labml_db import Model, Index
  from labml_db.serializer.pickle import PickleSerializer
  from typing import Dict, Any, List
  from labml_app.enums import COMPUTEREnums
  from labml_app.logger import logger
  from ..analysis import Analysis
  from ..preferences import Preferences
  from ..series import SeriesModel, Series
  from ..series_collection import SeriesCollection
label_desc: Use image node_id 1 for calling the GPUPreferencesModel obj's underlying member method code with example usage: obj.defaults(cls) and returns: dict