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https://issues.apache.org/jira/browse/MADLIB-1332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Domino Valdano updated MADLIB-1332:
-----------------------------------
Priority: Major (was: Minor)
> DL: Support mini-batched validation data for fit/evaluate
> ---------------------------------------------------------
>
> Key: MADLIB-1332
> URL: https://issues.apache.org/jira/browse/MADLIB-1332
> Project: Apache MADlib
> Issue Type: Improvement
> Components: Deep Learning
> Reporter: Domino Valdano
> Priority: Major
> Fix For: v1.16
>
>
> Currently, {{keras_evaluate()}} is implemented by calling
> {{internal_keras_evaluate()}} as a UDF. This requires the validation table
> passed to {{keras_fit()}} to be in a format with only 1 image per row, even
> though the training table is in a different format, with a batch of images in
> every row. This is potentially confusing and cumbersome for users to deal
> with, and based on some preliminary testing it seems that passing only 1
> image at a time to keras_evaluate() is also slowing down performance.
> We can solve this by converting {{internal_keras_evaluate()}} into a UDA, so
> that it runs on a minibatched validation table in the same form as the
> training table.
>
> Tasks:
> * Convert the {{internal_keras_evaluate}} UDF to a UDA and perform weighted
> averaging of loss and accuracy.
> * Since x and y will now be minibatched, we don't need to add another
> dimension to {{x and y}} np arrays in {{internal_keras_evaluate}}.
> * Compare UDF to UDA and verify that the UDA results in a speed improvement
>
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