eric-haibin-lin commented on a change in pull request #10292: [MXNET-243] Allow 
custom merger in KVStore
URL: https://github.com/apache/incubator-mxnet/pull/10292#discussion_r180639323
 
 

 ##########
 File path: python/mxnet/kvstore.py
 ##########
 @@ -83,6 +83,22 @@ def updater_handle(key, lhs_handle, rhs_handle, _):
         updater(key, lhs, rhs)
     return updater_handle
 
+class MergeMeta(ctypes.Structure):
+    _fields_ = [('num_merged', ctypes.c_size_t),
+                ('sender_id', ctypes.c_int),
+                ('timestamp', ctypes.c_int)]
+MergeMetaHandle = ctypes.c_void_p
 
 Review comment:
   Can we put this in base.py?
   
https://github.com/apache/incubator-mxnet/blob/master/python/mxnet/base.py#L120

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