made available the rebuild_collect_shared function and make the docsting a little better.

theano/compile/__init__.py

@@ -20,7 +20,7 @@ from debugmode import DebugMode
 from profilemode import ProfileMode
 
 from theano.compile.sharedvalue import shared, shared_constructor, SharedVariable
-from theano.compile.pfunc import pfunc, Param
+from theano.compile.pfunc import pfunc, Param, rebuild_collect_shared
 
 from function import function
 

theano/compile/pfunc.py

@@ -42,7 +42,7 @@ def rebuild_collect_shared(outputs,
                     inputs of the computational graph (or None)
     :type replace: dict
     :param replace: dictionary describing which subgraphs should be
-                    replaced by what
+                    replaced by what. orig_value => new_value
 
     :type updates: dict
     :param updates: dictionary describing updates expressions for shared