Merged

theano/gof/cc.py

@@ -1105,6 +1105,12 @@ def _execute(cthunk, init_tasks, tasks, error_storage):
             except:
                 print >> sys.stderr, 'ERROR retrieving error_storage', error_storage
                 raise
+
+
+            #TODO-- someone who understands how these exceptions work, please put this info into the exception message itself
+            # (exc_value.message seems to be ignored)
+            print "while computing "+str(task.outputs)
+
             raise exc_type, exc_value, exc_trace
     execute.cthunk = cthunk
     return execute

theano/scan_module/scan.py

@@ -415,6 +415,10 @@ def scan( fn
                   # each frame by the corresponding slice
                 nw_slice = seq['input'][0].type()
                 actual_slice = seq['input'][k-mintap]
+
+                if not hasattr(seq['input'],'name'):
+                    raise TypeError('Expected object with a "name" field, got '+str(seq)+"['input'] = "+str(seq['input']))
+
                 # Add names to slices for debugging and pretty printing ..
                 # that is if the input already has a name
                 if seq['input'].name:

theano/tensor/elemwise.py

@@ -662,7 +662,7 @@ class Elemwise(Op):
         try:
             variables = ufunc(*ufunc_args)
         except Exception, e:
-            errormsg = 'Failed calling ufunc for op', self.scalar_op,\
+            errormsg = 'While computing '+str(node.outputs)+': Failed calling ufunc for op', self.scalar_op,\
                         'for params of shape', [arg.shape for arg in ufunc_args]
             e.args = e.args + errormsg
             raise