leezu commented on a change in pull request #17749: Fix races in block scope
URL: https://github.com/apache/incubator-mxnet/pull/17749#discussion_r387861538
 
 

 ##########
 File path: python/mxnet/gluon/block.py
 ##########
 @@ -48,8 +48,9 @@ class _BlockScope(object):
     def __init__(self, block):
         self._block = block
         self._counter = {}
-        self._old_scope = None
-        self._name_scope = None
+        self._local = threading.local()
 
 Review comment:
   It's a bug. MXNet will currently experience undefined behaviour when 
coroutines are used. There's no immediate plan to fix it, as it requires some 
backend work as well. However, new code should ideally be written in a correct 
way to reduce future efforts.

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