code: def set_file_mode(value):
      if value == "single":
          return True, False
      else:
          return False, True
  
file_path: merlion/merlion/dashboard/callbacks/forecast.py
imports: import logging
  import os
  import traceback
  import dash
  from dash import Input, Output, State, dcc, callback
  from merlion.dashboard.utils.file_manager import FileManager
  from merlion.dashboard.models.forecast import ForecastModel
  from merlion.dashboard.pages.utils import create_param_table, create_metric_table, create_empty_figure
label_desc: Use image node_id 9 for calling a global function with example usage: set_file_mode(value) and returns: True,  False, False,  True