Github user pferrel commented on the issue:
https://github.com/apache/incubator-predictionio/pull/328
Ideally `pio build` and `pio train` should run anywhere by supplying any
params needed.
@chanlee514 metadata still is needed in a service like Elasticsearch so
every place the model is deployed will know the params. When is engine.json etc
written to the metastore?
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