code: def __init__(self, memory_size, **kwargs):
      super(BABI20Field, self).__init__(**kwargs)
      self.memory_size = memory_size
      self.unk_token = None
      self.batch_first = True
  
file_path: pytext/pytext/legacy/datasets/babi.py
imports: import os
  from io import open
  import torch
  from ..data import Dataset, Example, Field, Iterator
label_desc: Use image node_id 1 to create a new BABI20Field object from inherited base classes: Field with example: obj = BABI20Field(memory_size)