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Orhan Kislal commented on MADLIB-1168: -------------------------------------- [~fmcquillan] How should we handle negative values for output_table_size. I think giving an error should be fine but wanted to make sure that is the expected behavior in other similar modules (MADlib or other open source projects). > Balance datasets > ---------------- > > Key: MADLIB-1168 > URL: https://issues.apache.org/jira/browse/MADLIB-1168 > Project: Apache MADlib > Issue Type: New Feature > Components: Module: Sampling > Reporter: Frank McQuillan > Assignee: ssoni > Fix For: v1.14 > > Attachments: MADlib Balance Datasets Requirements.pdf, > MADlib_Balance_Datasets_Requirements_v2.pdf > > > From [1] here is the motivation behind balancing datasets: > “Most classification algorithms will only perform optimally when the number > of samples of each class is roughly the same. Highly skewed datasets, where > the minority is heavily outnumbered by one or more classes, have proven to be > a challenge while at the same time becoming more and more common. > One way of addressing this issue is by re-sampling the dataset as to offset > this imbalance with the hope of arriving at a more robust and fair decision > boundary than you would otherwise. > Re-sampling techniques can be divided in these categories: > * Under-sampling the majority class(es). > * Over-sampling the minority class. > * Combining over- and under-sampling. > * Create ensemble balanced sets.” > There is an extensive literature on balancing datasets. The plan for MADlib > in the initial phase is to offer basic functionality that can be extended in > later phases based on feedback from users. > Please see attached document for proposed scope of this story. > References > [1] imbalance-learn Python project > http://contrib.scikit-learn.org/imbalanced-learn/stable/index.html > https://github.com/scikit-learn-contrib/imbalanced-learn -- This message was sent by Atlassian JIRA (v6.4.14#64029)