class_docstr: :class:`BasePreprocessor` to input handle data.
  
  A preprocessor should be used in two steps. First, `fit`, then,
  `transform`. `fit` collects information into `context`, which includes
  everything the preprocessor needs to `transform` together with other
  useful information for later use. `fit` will only change the
  preprocessor's inner state but not the input data. In contrast,
  `transform` returns a modified copy of the input data without changing
  the preprocessor's inner state.
docstr: Initialization.
docstr_tok: ["Initialization","."]
code: def __init__(self):
      """Initialization."""
      self._context = {}
  
file_path: MatchZoo/matchzoo/engine/base_preprocessor.py
imports: import abc
  import functools
  import typing
  from pathlib import Path
  import dill
  import matchzoo
label_desc: Use image node_id 1 to create a new BasePreprocessor object  with example: obj = BasePreprocessor()