code: def _iter_stage_param_files(state):
      seen = set()
      for _param, filename in dvc_util.iter_stage_params(
          state.target_stage, state.dvc_config
      ):
          if not filename in seen:
              seen.add(filename)
              yield filename
  
imports: import argparse
  import logging
  import os
  import subprocess
  import yaml
  from guild import op_util
  from guild import run
  from guild import run_manifest
  from guild import summary
  from guild import util
  from .None import dvc_util
label_desc: Use image node_id 30 for calling a global function with example usage: _iter_stage_param_files(state) without return types