zheng-da commented on issue #12154: the cond operator doesn't support a function that doesn't require inputs. URL: https://github.com/apache/incubator-mxnet/issues/12154#issuecomment-412695405 The reason that the cond operator fails is that CachedOp, which the cond operator uses to execute a subgraph, requires to have inputs for every subgraph.
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