code: def parse_args():
      """Defines all arguments.
      Returns
      -------
      args object that contains all the params
      """
      parser = argparse.ArgumentParser(
          formatter_class=argparse.ArgumentDefaultsHelpFormatter,
          description="Create an image list or \
          make a record database by reading from an image list",
      )
      parser.add_argument(
          "prefix", help="prefix of input/output lst and rec files."
      )
      parser.add_argument(
          "root", help="path to folder containing images."
      )
  
      cgroup = parser.add_argument_group(
          "Options for creating image lists"
      )
      cgroup.add_argument(
          "--list",
          action="store_true",
          help="If this is set im2rec will create image list(s) by traversing root folder\
          and output to <prefix>.lst.\
          Otherwise im2rec will read <prefix>.lst and create a database at <prefix>.rec",
      )
      cgroup.add_argument(
          "--exts",
          nargs="+",
          default=[".jpeg", ".jpg", ".png"],
          help="list of acceptable image extensions.",
      )
      cgroup.add_argument(
          "--chunks", type=int, default=1, help="number of chunks."
      )
      cgroup.add_argument(
          "--train-ratio",
          type=float,
          default=1.0,
          help="Ratio of images to use for training.",
      )
      cgroup.add_argument(
          "--test-ratio",
          type=float,
          default=0,
          help="Ratio of images to use for testing.",
      )
      cgroup.add_argument(
          "--recursive",
          action="store_true",
          help="If true recursively walk through subdirs and assign an unique label\
          to images in each folder. Otherwise only include images in the root folder\
          and give them label 0.",
      )
      cgroup.add_argument(
          "--no-shuffle",
          dest="shuffle",
          action="store_false",
          help="If this is passed, \
          im2rec will not randomize the image order in <prefix>.lst",
      )
      rgroup = parser.add_argument_group(
          "Options for creating database"
      )
      rgroup.add_argument(
          "--pass-through",
          action="store_true",
          help="whether to skip transformation and save image as is",
      )
      rgroup.add_argument(
          "--resize",
          type=int,
          default=0,
          help="resize the shorter edge of image to the newsize, original images will\
          be packed by default.",
      )
      rgroup.add_argument(
          "--center-crop",
          action="store_true",
          help="specify whether to crop the center image to make it rectangular.",
      )
      rgroup.add_argument(
          "--quality",
          type=int,
          default=95,
          help="JPEG quality for encoding, 1-100; or PNG compression for encoding, 1-9",
      )
      rgroup.add_argument(
          "--num-thread",
          type=int,
          default=1,
          help="number of thread to use for encoding. order of images will be different\
          from the input list if >1. the input list will be modified to match the\
          resulting order.",
      )
      rgroup.add_argument(
          "--color",
          type=int,
          default=1,
          choices=[-1, 0, 1],
          help="specify the color mode of the loaded image.\
          1: Loads a color image. Any transparency of image will be neglected. It is the default flag.\
          0: Loads image in grayscale mode.\
          -1:Loads image as such including alpha channel.",
      )
      rgroup.add_argument(
          "--encoding",
          type=str,
          default=".jpg",
          choices=[".jpg", ".png"],
          help="specify the encoding of the images.",
      )
      rgroup.add_argument(
          "--pack-label",
          action="store_true",
          help="Whether to also pack multi dimensional label in the record file",
      )
      args = parser.parse_args()
      args.prefix = os.path.abspath(args.prefix)
      args.root = os.path.abspath(args.root)
      return args
  
file_path: mxnet/tools/im2rec.py
imports: from __future__ import print_function
  import os
  import sys
  import mxnet
  import random
  import argparse
  import cv2
  import time
  import traceback
label_desc: Use image node_id 8 for calling a global function with example usage: parse_args() and returns: args