code: def product_dict(dictionary):
      keys = dictionary.keys()
      vals = dictionary.values()
      for instance in itertools.product(*vals):
          yield dict(zip(keys, instance))
  
file_path: ParlAI/tests/tasks/test_wizard_of_wikipedia.py
imports: from parlai.scripts.display_data import display_data, setup_args
  from parlai.agents.repeat_label.repeat_label import RepeatLabelAgent
  from parlai.core.message import Message
  from parlai.core.metrics import F1Metric, AverageMetric
  from parlai.core.teachers import create_task_agent_from_taskname
  from parlai.core.worlds import create_task
  from parlai.tasks.wizard_of_wikipedia.agents import TOKEN_KNOWLEDGE
  import unittest
  import itertools
  import parlai.utils.testing
label_desc: Use image node_id 1 for calling a global function with example usage: product_dict(dictionary) without return types