shared variable constructor for sparse matrices

theano/gof/graph.py

@@ -149,6 +149,8 @@ class Apply(utils.object2):
         :returns: an Apply instance with the same op but different outputs.
 
         """
+        # !!
+        strict = False
         remake_node = False
         for curr, new in zip(self.inputs, inputs):
             if not curr.type == new.type:

theano/sparse/__init__.py

@@ -12,4 +12,6 @@ except ImportError:
     sys.stderr.write("WARNING: scipy can't be imported. We disable the sparse matrix code.")
 if enable_sparse:
     from basic import *
+    import sharedvar
+    from sharedvar import sparse_constructor as shared