code: def test_none_Constant():
      # Tests equals
      # We had an error in the past with unpickling
  
      o1 = Constant(NoneTypeT(), None, name="NoneConst")
      o2 = Constant(NoneTypeT(), None, name="NoneConst")
      assert o1.equals(o2)
      assert NoneConst.equals(o1)
      assert o1.equals(NoneConst)
      assert NoneConst.equals(o2)
      assert o2.equals(NoneConst)
  
      # This trigger equals that returned the wrong answer in the past.
      import six.moves.cPickle as pickle
      import theano
      from theano import tensor
  
      x = tensor.vector("x")
      y = tensor.argmax(x)
      kwargs = {}
      # We can't pickle DebugMode
      if theano.config.mode in ["DebugMode", "DEBUG_MODE"]:
          kwargs = {"mode": "FAST_RUN"}
      f = theano.function([x], [y], **kwargs)
      pickle.loads(pickle.dumps(f))
  
imports: from __future__ import absolute_import, print_function, division
  import theano
  from theano.gof import Constant
  from theano.tensor.type_other import MakeSlice, make_slice, NoneTypeT, NoneConst
label_desc: Use image node_id 2 for calling a global function with example usage: test_none_Constant() without return types