Fix values_eq_approx() for GpuAllocEmpty

theano/sandbox/cuda/basic_ops.py

@@ -3275,7 +3275,9 @@ class GpuAllocEmpty(GpuOp):
                 const_shp = None
             bcast.append(numpy.all(1 == const_shp))
         otype = CudaNdarrayType(dtype='float32', broadcastable=bcast)
-        return Apply(self, sh, [otype()])
+        output = otype()
+        output.values_eq_approx = tensor.type.values_eq_approx_always_true
+        return Apply(self, sh, [output])
 
     def perform(self, node, inputs, out_):
         out, = out_

theano/tensor/type.py

@@ -630,6 +630,10 @@ def values_eq_approx_remove_inf_nan(a, b):
     return TensorType.values_eq_approx(a, b, True, True)
 
 
+def values_eq_approx_always_true(a, b):
+    return True
+
+
 # Register TensorType C code for ViewOp.
 theano.compile.register_view_op_c_code(
         TensorType,