code: def _weak_lru_cache(maxsize=100):
      """
      Users should only access the lru_cache through its public API:
      cache_info, cache_clear
      The internals of the lru_cache are encapsulated for thread safety and
      to allow the implementation to change.
      """
  
      def decorating_function(
          user_function,
          tuple=tuple,
          sorted=sorted,
          len=len,
          KeyError=KeyError,
      ):
          hits, misses = [0], [0]
          kwd_mark = (
              object(),
          )  # separates positional and keyword args
          lock = Lock()  # needed because OrderedDict isn't threadsafe
  
          if maxsize is None:
              cache = (
                  _WeakArgsDict()
              )  # cache without ordering or size limit
  
              @wraps(user_function)
              def wrapper(*args, **kwds):
                  key = args
                  if kwds:
                      key += kwd_mark + tuple(sorted(kwds.items()))
                  try:
                      result = cache[key]
                      hits[0] += 1
                      return result
                  except KeyError:
                      pass
                  result = user_function(*args, **kwds)
                  cache[key] = result
                  misses[0] += 1
                  return result
  
          else:
              # ordered least recent to most recent
              cache = _WeakArgsOrderedDict()
              cache_popitem = cache.popitem
              cache_renew = cache.move_to_end
  
              @wraps(user_function)
              def wrapper(*args, **kwds):
                  key = args
                  if kwds:
                      key += kwd_mark + tuple(sorted(kwds.items()))
                  with lock:
                      try:
                          result = cache[key]
                          cache_renew(
                              key
                          )  # record recent use of this key
                          hits[0] += 1
                          return result
                      except KeyError:
                          pass
                  result = user_function(*args, **kwds)
                  with lock:
                      cache[
                          key
                      ] = result  # record recent use of this key
                      misses[0] += 1
                      if len(cache) > maxsize:
                          # purge least recently used cache entry
                          cache_popitem(False)
                  return result
  
          def cache_info():
              """Report cache statistics"""
              with lock:
                  return hits[0], misses[0], maxsize, len(cache)
  
          def cache_clear():
              """Clear the cache and cache statistics"""
              with lock:
                  cache.clear()
                  hits[0] = misses[0] = 0
  
          wrapper.cache_info = cache_info
          wrapper.cache_clear = cache_clear
          return wrapper
  
      return decorating_function
  
imports: from collections import OrderedDict, Sequence
  from functools import wraps
  from itertools import compress
  from weakref import WeakKeyDictionary, ref
  from six.moves._thread import allocate_lock
  from toolz.sandbox import unzip
label_desc: Use image node_id 1 for calling a global function with example usage: _weak_lru_cache(maxsize) and returns: decorating_function, wrapper, result, result, hits,  misses,  maxsize,  len, result, result