class_docstr: A simplified linked list with limited supported operations.
  
  It doesn't copy any data pass to it but directly refer to it.
class_docstr_tok: ["A","simplified","linked","list","with","limited","supported","operations",".","It","does","n't","copy","any","data","pass","to","it","but","directly","refer","to","it","."]
code: def __init__(self):
      # _memory is a list to store data.
      # Its index is the address for the linked list.
      # index to data
      self._memory = []
      self._data_to_index = {}
      # index to index
      self._next_index = collections.defaultdict(lambda: None)
      self._last_index = None
  
file_path: keras-tuner/keras_tuner/tuners/gridsearch.py
imports: import collections
  import copy
  from keras_tuner.api_export import keras_tuner_export
  from keras_tuner.engine import oracle
  from keras_tuner.engine import trial
  from keras_tuner.engine import tuner
label_desc: Use image node_id 1 to create a new LinkedList object  with example: obj = LinkedList()