zhreshold commented on issue #16708: Training an FPN model using grad_req="add" causes rapid divergence, while manually implemented gradient accumulation works fine URL: https://github.com/apache/incubator-mxnet/issues/16708#issuecomment-552634447 At first glance it's related to implementation in contrib operator, however, when I dig into it, it's more complicated than I though, I am still investigating.
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