fixed theano_opt.gemm_pattern_1

tensor_opt.py

@@ -4,14 +4,14 @@ from elemwise import Elemwise, DimShuffle
 import scalar
 import tensor as T
 
-
+# gemm: (d,a,b,c,s) -> d = d*s + a*dot(b,c)
 gemm_pattern_1 = gof.PatternSub((T.sub_inplace,
                                  'd',
                                  (T.mul,
                                   dict(pattern = (T.DimShuffle((), ['x', 'x'], inplace = True), 'a'),
                                        allow_multiple_clients = True),
                                   (T.dot, 'b', 'c'))),
-                                (T.gemm, 'd', 'a', 'b', 'c', T.constant(-1.0)),
+                                (T.gemm, 'd', (T.neg, 'a'), 'b', 'c', T.constant(1.0)),
                                 allow_multiple_clients = False)