fix for GpuContiguous and GpuElemwise

theano/gpuarray/opt.py

@@ -424,7 +424,8 @@ class GraphToGPU(Optimizer):
             outputs = []
 
             if isinstance(new_ops, theano.Op):
-                outputs = new_ops(*[mapping[i] for i in node.inputs], return_list=True)
+                with inherit_stack_trace(node.outputs):
+                    outputs = new_ops(*[mapping[i] for i in node.inputs], return_list=True)
             elif not new_ops:
                 newnode = node.clone_with_new_inputs([mapping.get(i) for i in node.inputs])
                 outputs = newnode.outputs

theano/gpuarray/tests/test_opt.py

@@ -40,8 +40,6 @@ def _check_stack_trace(thing):
                                    theano.tensor.elemwise.Elemwise,
                                    theano.ifelse.IfElse,
                                    GpuFromHost, HostFromGpu,
-                                   basic_ops.GpuContiguous,
-                                   GpuElemwise,
                                    ))
     return check_stack_trace(thing, ops_to_check=_ops_to_check,
                              bug_print="ignore")