added eq and hash for tensor.Dot

theano/tensor/basic.py

@@ -3578,6 +3578,11 @@ class Dot(Op):
 
     """
 
+    def __eq__(self, other):
+        return type(self) == type(other)
+    def __hash__(self):
+        return hash(type(self))
+
     # the rationale for Dot22 is related to getting GEMM Ops into the graph.  See Dot22 in tensor.blas for details.
     
     def make_node(self, *inputs):

theano/tensor/tests/test_blas.py

@@ -21,6 +21,9 @@ else: mode_not_fast_compile = config.mode
 
 mode_blas_opt = theano.compile.get_default_mode().including('BlasOpt', 'specialize')
 
+def test_dot_eq():
+    assert T.Dot() == T.Dot()
+
 class t_gemm(TestCase):
     """This test suite is supposed to establish that gemm works as it is supposed to."""
     def setUp(self):