code: def _is_constraints_file(line):
      return line.startswith("-c ") or line.startswith("--constraint ")
  
imports: import json
  import logging
  import os
  import re
  import subprocess
  import sys
  import tempfile
  from collections import namedtuple
  from itertools import chain, filterfalse
  from pathlib import Path
  from threading import Timer
  from typing import NamedTuple, Optional
  import importlib_metadata
  import pkg_resources
  from packaging.requirements import Requirement
  from packaging.version import InvalidVersion, Version
  import mlflow
  from mlflow.environment_variables import MLFLOW_REQUIREMENTS_INFERENCE_TIMEOUT
  from mlflow.exceptions import MlflowException
  from mlflow.tracking.artifact_utils import _download_artifact_from_uri
  from mlflow.utils.autologging_utils.versioning import _strip_dev_version_suffix
  from mlflow.utils.databricks_utils import is_in_databricks_runtime
label_desc: Use image node_id 5 for calling a global function with example usage: _is_constraints_file(line) and returns: unknown