code: def iter_stage_params(stage, dvc_config):
      """Returns an iteration of param_name and filename containing param."""
      stage_config = _stage_config(stage, dvc_config)
      for item in _stage_params(stage_config):
          if isinstance(item, str):
              yield item, "params.yaml"
          elif isinstance(item, dict):
              for key, val in item.items():
                  if isinstance(val, str):
                      yield val, key
                  elif isinstance(val, list):
                      for val_item in val:
                          yield val_item, key
                  else:
                      assert False, (val, item)
          else:
              assert False, item
  
imports: import json
  import logging
  import os
  import subprocess
  import yaml
  from guild import util
  from guild import var
label_desc: Use image node_id 11 for calling a global function with example usage: iter_stage_params(stage, dvc_config) without return types