code: def fit(self, X, y=None, **fit_params):
      return self
  
file_path: neupy/examples/mlp/imdb_review_classification/src/preprocessing.py
imports: from nltk.corpus import stopwords
  from nltk.tokenize import RegexpTokenizer
  from sklearn.base import TransformerMixin
  from sklearn.preprocessing import FunctionTransformer
label_desc: Use image node_id 1 for calling the CustomTransformerMixin obj's underlying member method code with example usage: obj.fit(X, y) and returns: self