class_docstr: Limits unbound ahead-processing of multiprocessing.Pool's imap method
  before items get consumed by the iteration caller.
  This prevents OOM issues in situations where items represent larger memory allocations.
code: def __enter__(self):
      return self
  
imports: import os
  import sys
  import time
  import heapq
  import semver
  import random
  from multiprocessing import Pool
  from collections import namedtuple
label_desc: Use image node_id 2 for calling the LimitingPool obj's underlying member method code with example usage: obj.__enter__() and returns: self