code: def _install_missing_requirements(
      retriever: _LightningAppOpenAPIRetriever,
      fail_if_missing: bool = False,
  ):
      requirements = set()
      for metadata in retriever.api_commands.values():
          if metadata["tag"] == OpenAPITags.APP_CLIENT_COMMAND:
              for req in metadata.get("requirements", []) or []:
                  requirements.add(req)
  
      if requirements:
          missing_requirements = []
          for req in requirements:
              if not (
                  package_available(req)
                  or package_available(req.replace("-", "_"))
              ):
                  missing_requirements.append(req)
  
          if missing_requirements:
              if fail_if_missing:
                  missing_requirements = " ".join(missing_requirements)
                  print(
                      f"The command failed as you are missing the following requirements: `{missing_requirements}`."
                  )
                  sys.exit(0)
  
              for req in missing_requirements:
                  std_out_out = get_logfile("output.log")
                  with open(std_out_out, "wb") as stdout:
                      Popen(
                          f"{sys.executable} -m pip install {req}",
                          shell=True,
                          stdout=stdout,
                          stderr=stdout,
                      ).wait()
                  os.remove(std_out_out)
  
imports: import json
  import os
  import shutil
  import sys
  from subprocess import Popen
  from typing import List, Optional, Tuple
  import click
  import psutil
  from lightning_utilities.core.imports import package_available
  from rich.progress import Progress
  from lightning.app.utilities.cli_helpers import _get_app_display_name, _LightningAppOpenAPIRetriever
  from lightning.app.utilities.cloud import _get_project
  from lightning.app.utilities.enum import OpenAPITags
  from lightning.app.utilities.log import get_logfile
  from lightning.app.utilities.network import LightningClient
label_desc: Use image node_id 10 for calling a global function with example usage: _install_missing_requirements(retriever, fail_if_missing) without return types