class_docstr: This class provides a way to pickle a function and its arguments.
  It also provides a way to create a script that can run a
  function with arguments if they have them pickled to a file.
  It also provides a way of extracting the conents of a pickle file.
docstr: Given a function and args, this function will pickle them to a file.
  
  Parameters
  ----------
  fn: Callable
      The picklable function that will be pickled to a file.
  file_path: str
      The path where to save the pickled function, args, and kwargs. If it's the
      empty string, the function will decide on a random name.
  save_dir: str
      The directory in which to save the file with the pickled function and arguments.
      Does nothing if the path is specified. If both file_path and save_dir are empty,
      the function will write the file to the current working directory with a random
      name.
  *args: Any
      Arguments of fn that will be pickled.
  **kwargs: Any
      Key word arguments to fn that will be pickled.
  
  Returns
  -------
  str
      The path to the file where the function and arguments are pickled.
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code: def pickle_fn_and_save(
      fn: Callable,
      file_path: str,
      save_dir: str,
      *args: Any,
      **kwargs: Any,
  ) -> str:
      """
      Given a function and args, this function will pickle them to a file.
  
      Parameters
      ----------
      fn: Callable
          The picklable function that will be pickled to a file.
      file_path: str
          The path where to save the pickled function, args, and kwargs. If it's the
          empty string, the function will decide on a random name.
      save_dir: str
          The directory in which to save the file with the pickled function and arguments.
          Does nothing if the path is specified. If both file_path and save_dir are empty,
          the function will write the file to the current working directory with a random
          name.
      *args: Any
          Arguments of fn that will be pickled.
      **kwargs: Any
          Key word arguments to fn that will be pickled.
  
      Returns
      -------
      str
          The path to the file where the function and arguments are pickled.
      """
      if file_path != "":
          with open(file_path, "wb") as f:
              cloudpickle.dump((fn, args, kwargs), f)
              return f.name
  
      if save_dir == "":
          save_dir = os.getcwd()
  
      with tempfile.NamedTemporaryFile(dir=save_dir, delete=False) as f:
          cloudpickle.dump((fn, args, kwargs), f)
          return f.name
  
file_path: spark/python/pyspark/ml/dl_util.py
imports: import os
  import tempfile
  import textwrap
  from typing import Any, Callable
  from pyspark import cloudpickle
label_desc: Use image node_id 1 for calling the FunctionPickler obj's underlying member method code with example usage: obj.pickle_fn_and_save(fn, file_path, save_dir) and returns: f, f