code: def test_copy():
      x = tt.dmatrix("x")
      data = np.random.rand(5, 5)
      y = x.copy(name="y")
      f = theano.function([x], y)
      assert_equal(f(data), data)
      assert_string_equal(y.name, "y")
  
file_path: Theano/theano/tensor/tests/test_var.py
imports: from __future__ import absolute_import, print_function, division
  import numpy
  from numpy.testing import assert_equal, assert_string_equal
  import theano
  import theano.tensor
  import theano.tests.unittest_tools
  from theano.tensor import Subtensor, AdvancedSubtensor, AdvancedSubtensor1, IncSubtensor, AdvancedIncSubtensor, AdvancedIncSubtensor1
label_desc: Use image node_id 3 for calling a global function with example usage: test_copy() without return types