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https://issues.apache.org/jira/browse/SYSTEMML-1401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924804#comment-15924804
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Imran Younus commented on SYSTEMML-1401:
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[~prithvianight] [~mboehm7] [~ae2015] [~a1singh]
Please have a look at this. This is important for R4ML.
> Data mismatch problem with Cox Predict script
> ---------------------------------------------
>
> Key: SYSTEMML-1401
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1401
> Project: SystemML
> Issue Type: Bug
> Components: Algorithms
> Environment:
> Reporter: Imran Younus
>
> The Cox predict script internally sorts the input/test data set w.r.t. time.
> This is necessary to calculate the cumulative hazard function. But creates a
> serious problem for the user because all the results returned from the
> predict script are sorted by time but the input data is not, and user has no
> way of matching the input data with predictions.
> There are two possible solutions to this problems:
> 1) We should restore the original order inside the predict script before
> returning the final results, so that the order of the predictions match
> exactly with order of the input data.
> 2) We can add sorted time column in the final output to let the user know
> which prediction corresponds to which time value. This may be easier to
> implement, but I think this is not ideal solution because in case of ties in
> time values, user will still have problem matching input with the predictions.
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