multinomial grad changed to zeros_like

theano/sandbox/multinomial.py

@@ -5,7 +5,6 @@ from theano import Op, Apply
 import theano.tensor as T
 from theano.gof import local_optimizer
 from theano.gof.python25 import any
-from theano.gradient import DisconnectedType
 
 from theano.sandbox.cuda import cuda_available, GpuOp
 if cuda_available:
@@ -45,7 +44,7 @@ class MultinomialFromUniform(Op):
     def grad(self, ins, outgrads):
         pvals, unis = ins
         (gz,) = outgrads
-        return [DisconnectedType()() for x in ins]
+        return [T.zeros_like(x) for x in ins]
 
     def c_code_cache_version(self):
         return (5,)