Merge pull request #3369 from yingzha/ccw

theano/tensor/tests/test_var.py

 import numpy as np
+from numpy.testing import assert_equal, assert_string_equal
 
 import theano
 import theano.tensor as tt
@@ -19,3 +20,12 @@ def test_numpy_method():
         f = theano.function([x], y)
         utt.assert_allclose(np.nan_to_num(f(data)),
                             np.nan_to_num(fct(data)))
+
+
+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')

theano/tensor/var.py

@@ -520,8 +520,11 @@ class _tensor_py_operators:
         return theano.tensor.subtensor.take(self, indices, axis, mode)
 
     # COPYING
-    def copy(self):
-        return theano.tensor.basic.tensor_copy(self)
+    def copy(self, name=None):
+        """Copy a variable and optionally assign a name."""
+        copied_variable = theano.tensor.basic.tensor_copy(self)
+        copied_variable.name = name
+        return copied_variable
 
     def __iter__(self):
         try: