zhreshold commented on issue #14396: mx.nd.Custom not working in subprocess URL: https://github.com/apache/incubator-mxnet/issues/14396#issuecomment-471961381 I rekon there's a limitation of custom op with requires a global lock when executing the python custom op, and it might cause dead lock when combined with subprocess. @eric-haibin-lin raising for expertise in engine part.
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