code: def fit_transform(self, X, y=None):
      self.fit(X, y)
      return self.transform(X)
  
imports: import logging
  import pytest
  from sklearn import datasets
  from sklearn.base import BaseEstimator, TransformerMixin
  from sklearn.model_selection import GridSearchCV
  from sklearn.multiclass import OneVsOneClassifier, OneVsRestClassifier, OutputCodeClassifier
  from sklearn.pipeline import FeatureUnion
  from sklearn.preprocessing import StandardScaler
  from sklearn.svm import LinearSVC
  from sklego.pipeline import DebugPipeline, make_debug_pipeline
label_desc: Use image node_id 4 for calling the Adder obj's underlying member method code with example usage: obj.fit_transform(X, y) and returns: self