barry-jin commented on a change in pull request #20462:
URL: https://github.com/apache/incubator-mxnet/pull/20462#discussion_r673515352
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File path: src/imperative/cached_op.cc
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@@ -989,7 +991,12 @@ void CachedOp::StaticBackward(
auto entry = state.info.grad_graph.outputs[iter->second];
if (!idx.exist(entry.node.get())) continue;
auto eid = idx.entry_id(entry);
- state.array_reqs[eid] = reqs[iter->second];
+ // if ref count is not 0, then we should not assign req user provide
+ if (reqs[iter->second] == kNullOp && !(ref_count[eid] == 0)) {
+ state.array_reqs[eid] = kWriteTo;
Review comment:
Yes, we need to put `kWriteTo` here. Because memory plan already happens
in
[SetBackwardGraph](https://github.com/apache/incubator-mxnet/blob/3480ba2c6df02bb907d3a975d354efa8697c4e71/src/imperative/cached_op.cc#L259)
before this. Here we get the updated ref_count from the graph and modify the
req_types based on the ref_count.
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