Github user chanlee514 commented on the issue:
https://github.com/apache/incubator-predictionio/pull/328
@pferrel: Yes the hash of engine directory path is used as engineVersion
(which kind of acts as the id).
However, I'm working on making updates to this PR so that users can provide
the directory path as CLI argument for `pio build/train/deploy/undeploy`
commands. This will enable users to run pio commands anywhere, and hopefully
make this issue clearer.
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