Add Reshape track to local_dimshuffle_lift

theano/tensor/opt.py

@@ -559,7 +559,7 @@ def is_dimshuffle_useless(new_order, input):
     return is_useless
 
 
-@gof.local_optimizer([DimShuffle])
+@gof.local_optimizer([DimShuffle, Reshape])
 def local_dimshuffle_lift(node):
     """
     "Lifts" DimShuffle through Elemwise operations and merges
@@ -573,9 +573,16 @@ def local_dimshuffle_lift(node):
     After this transform, clusters of Elemwise operations are
     void of DimShuffle operations.
 
+    Also removes useless DimShuffle operation inside Reshape:
+
+      reshape(vector.dimshuffle('x', 0), shp) => reshape(vector, shp)
+      reshape(matrix.dimshuffle('x', 0, 'x', 1), shp) => reshape(matrix, shp)
+      reshape(row.dimshuffle(1, 'x'), shp) => reshape(row, shp)
+      reshape(col.dimshuffle(0), shp) => reshape(col, shp)
+
     """
     op = node.op
-    if (isinstance(op, T.Reshape) and
+    if (isinstance(op, Reshape) and
             node.inputs[0].owner is not None and
             isinstance(node.inputs[0].owner.op, DimShuffle)):
         new_order = node.inputs[0].owner.op.new_order