szha commented on issue #16955: [Dataset] add flatten API to dataset URL: https://github.com/apache/incubator-mxnet/pull/16955#issuecomment-560571415 @sxjscience yes, it's similar to flat_map, minus the map part. Using itertools should make it possible for lazy flattening. I'm not sure what use cases there would be yet as it merely came from analogy. Plan for dataset API would be a larger topic.
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