code: def download_parameter(meta_list, args):
      """
      Download parameter file to local working directory.
      meta_list format is defined in paiJobRestServer.ts
      example meta_list:
      [
          {"experimentId":"yWFJarYa","trialId":"UpPkl","filePath":"/chec/nni/experiments/yWFJarYa/trials/UpPkl/parameter_1.cfg"},
          {"experimentId":"yWFJarYa","trialId":"aIUMA","filePath":"/chec/nni/experiments/yWFJarYa/trials/aIUMA/parameter_1.cfg"}
      ]
      """
      nni_log(LogType.Debug, str(meta_list))
      nni_log(
          LogType.Debug,
          "NNI_SYS_DIR: {}, trial Id: {}, experiment ID: {}".format(
              NNI_SYS_DIR, NNI_TRIAL_JOB_ID, NNI_EXP_ID
          ),
      )
      nni_log(
          LogType.Debug,
          "NNI_SYS_DIR files: {}".format(os.listdir(NNI_SYS_DIR)),
      )
      for meta in meta_list:
          if (
              meta["experimentId"] == NNI_EXP_ID
              and meta["trialId"] == NNI_TRIAL_JOB_ID
          ):
              param_fp = os.path.join(
                  NNI_SYS_DIR, os.path.basename(meta["filePath"])
              )
              if not os.path.exists(param_fp):
                  hdfs_client = get_hdfs_client(args)
                  copyHdfsFileToLocal(
                      meta["filePath"],
                      param_fp,
                      hdfs_client,
                      override=False,
                  )
  
imports: import argparse
  import ctypes
  import json
  import logging
  import os
  import re
  import shlex
  import sys
  import threading
  import time
  from subprocess import Popen
  import pkg_resources
  from pyhdfs import HdfsClient
  from .constants import LOG_DIR, MULTI_PHASE, NNI_EXP_ID, NNI_PLATFORM, NNI_SYS_DIR, NNI_TRIAL_JOB_ID
  from .hdfsClientUtility import copyDirectoryToHdfs, copyHdfsDirectoryToLocal, copyHdfsFileToLocal
  from .log_utils import LogType, RemoteLogger, StdOutputType, nni_log
  from .rest_utils import rest_get, rest_post
  from .url_utils import gen_parameter_meta_url, gen_send_version_url
label_desc: Use image node_id 6 for calling a global function with example usage: download_parameter(meta_list, args) without return types