code: def _assert_dvc_yaml(project_dir):
      dvc_yaml = os.path.join(project_dir, "dvc.yaml")
      if not os.path.exists(dvc_yaml):
          _missing_dvc_yaml_error(project_dir)
  
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 1 for calling a global function with example usage: _assert_dvc_yaml(project_dir) without return types