code: def _log_ndtr_cpu(x, dtype):
      from scipy import special
  
      return special.log_ndtr(x).astype(dtype)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_log_ndtr.py
imports: import unittest
  import numpy
  from chainer import backend
  from chainer.backends import cuda
  import chainer.functions
  from chainer import testing
label_desc: Use image node_id 1 for calling a global function with example usage: _log_ndtr_cpu(x, dtype) and returns: special