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https://issues.apache.org/jira/browse/MADLIB-1303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Frank McQuillan closed MADLIB-1303.
-----------------------------------
Resolution: Fixed
https://github.com/apache/madlib/pull/360
> Add 1-hot encoding to dependent variable in mini-batch preprocessor for images
> ------------------------------------------------------------------------------
>
> Key: MADLIB-1303
> URL: https://issues.apache.org/jira/browse/MADLIB-1303
> Project: Apache MADlib
> Issue Type: Improvement
> Components: Module: Utilities
> Reporter: Frank McQuillan
> Priority: Minor
> Fix For: v1.16
>
>
> Story
> As a data scientist, I want to have the mini-batch preprocessor 1-hot encode
> the dependent variable so that I don't need to do it myself. This applies to
> all types: boolean and character types such as text, char and varchar, &
> integers and floats.
> If the dependent variable is already an array, then we assume it is already
> 1-hot encoded and we just cast it to int[] and pass it along.
> We can remove the param `dependent_offset (optional)` from the current
> interface since 1-hot encoding is the more general solution.
> Open questions
> 1) Q: Can we just use the exact same 1-hot encoding as in
> http://madlib.apache.org/docs/latest/group__grp__minibatch__preprocessing.html
> ???
> i.e., add the param `one_hot_encode_int_dep_var (optional)`
> then we could use the same code that is already written and tested and such?
> A: we can re-use the code to the extent possible, but we do not need this
> param.
> 2) Q: In the case where the dependent variable is already 1-hot encoded, this
> means need to support array input for dependent variable. Also, should we
> just pass it thru or check for an array only with 1's and 0's?
> A: We will check first row but it does not guarantee all rows are correct.
> 3) Q: How to handle float? If user wants to encode float values for some
> reason, they could cast them to text first. Or just pass them along?
> A: If scalar float, we 1-hot encode (could be a valid case). If float[], we
> cast to int[].
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