code: def _create_data_source(shape):
      data_inputs = np.random.random(shape).astype(np.float32)
      expected_outputs = np.random.random(shape).astype(np.float32)
      return data_inputs, expected_outputs
  
file_path: Neuraxle/testing_neuraxle/steps/test_column_selector_2d.py
imports: import numpy
  import pytest
  from neuraxle.steps.column_transformer import ColumnSelector2D, ColumnsSelectorND, NumpyColumnSelector2D
label_desc: Use image node_id 6 for calling a global function with example usage: _create_data_source(shape) and returns: data_inputs,  expected_outputs