class_docstr: Base class for all 1-D transformers.
      
class_docstr_tok: ["Base","class","for","all","1-D","transformers","."]
code: def fit(self, X):
      return self
  
imports: from __future__ import division
  import numpy
  from sklearn.preprocessing import LabelBinarizer
  from sklearn.utils import column_or_1d
label_desc: Use image node_id 1 for calling the Transformer obj's underlying member method code with example usage: obj.fit(X) and returns: self