[jira] [Created] (PIO-105) Batch Predictions

["Mars Hall (JIRA)" <ji...@apache.org>]

Mars Hall created PIO-105:
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             Summary: Batch Predictions
                 Key: PIO-105
                 URL: https://issues.apache.org/jira/browse/PIO-105
             Project: PredictionIO
          Issue Type: New Feature
          Components: Core
            Reporter: Mars Hall
            Assignee: Mars Hall


Implement a new {{pio batchpredict}} command to enable massive, fast, batch predictions from a trained model. Read a multi-object JSON file as the input format, with one query object per line. Similarly, write results to a multi-object JSON file, with one prediction result + its original query per line.

Currently getting bulk predictions from PredictionIO is possible with either:

* a {{pio eval}} script, which will always train a fresh, unvalidated model before getting predictions
* a custom script that hits the {{queries.json}} HTTP API, which is a serious bottleneck when requesting hundreds-of-thousands or millions of predictions

Neither of these existing bulk-prediction hacks are adequate for the reasons mentioned.

It's time for this use-case to be a firstclass command :D



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