code: def _nonlinear(func):
      def aux(x):
          y = func(x)
          return y * y
  
      return aux
  
file_path: chainer/chainer/testing/unary_math_function_test.py
imports: import unittest
  import warnings
  import numpy
  from chainer.backends import cuda
  from chainer import function
  from chainer import functions
  from chainer import variable
label_desc: Use image node_id 6 for calling a global function with example usage: _nonlinear(func) and returns: aux, unknown