class_docstr: Used to check output of featureunions
class_docstr_tok: ["Used","to","check","output","of","featureunions"]
code: def __init__(self, expected_X=None):
      self.expected_X = expected_X
  
imports: import os
  from ast import literal_eval
  import numpy
  from distributed import Lock, Variable, get_worker
  from sklearn.base import BaseEstimator, ClassifierMixin
  from sklearn.utils.validation import _num_samples, check_array
label_desc: Use image node_id 1 to create a new CheckXClassifier object from inherited base classes: BaseEstimator with example: obj = CheckXClassifier(expected_X)