code: def add_namespace(doctest_namespace):
      doctest_namespace["np"] = numpy
      doctest_namespace["C"] = cntk
  
file_path: CNTK/bindings/python/doc/conftest.py
imports: import sys
  import pytest
  import cntk.cntk_py
  import numpy
  import cntk
label_desc: Use image node_id 4 for calling a global function with example usage: add_namespace(doctest_namespace) without return types