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This PR implements a streaming linear regression analysis, in which a linear regression model is trained online as new data arrive. The design is based on discussions with tdas and mengxr, in which we determined how to add this functionality in a general way, with minimal changes to existing libraries. __Summary of additions:__ _StreamingLinearAlgorithm_ - An abstract class for fitting generalized linear models online to streaming data, including training on (and updating) a model, and making predictions. _StreamingLinearRegressionWithSGD_ - Class and companion object for running streaming linear regression _StreamingLinearRegressionTestSuite_ - Unit tests _StreamingLinearRegression_ - Example use case: fitting a model online to data from one stream, and making predictions on other data __Notes__ - If this looks good, I can use the StreamingLinearAlgorithm class to easily implement other analyses that follow the same logic (Ridge, Lasso, Logistic, SVM). Author: Jeremy Freeman <the.freeman.lab@gmail.com> Author: freeman <the.freeman.lab@gmail.com> Closes #1361 from freeman-lab/streaming-mllib and squashes the following commits: 775ea29 [Jeremy Freeman] Throw error if user doesn't initialize weights 4086fee [Jeremy Freeman] Fixed current weight formatting 8b95b27 [Jeremy Freeman] Restored broadcasting 29f27ec [Jeremy Freeman] Formatting 8711c41 [Jeremy Freeman] Used return to avoid indentation 777b596 [Jeremy Freeman] Restored treeAggregate 74cf440 [Jeremy Freeman] Removed static methods d28cf9a [Jeremy Freeman] Added usage notes c3326e7 [Jeremy Freeman] Improved documentation 9541a41 [Jeremy Freeman] Merge remote-tracking branch 'upstream/master' into streaming-mllib 66eba5e [Jeremy Freeman] Fixed line lengths 2fe0720 [Jeremy Freeman] Minor cleanup 7d51378 [Jeremy Freeman] Moved streaming loader to MLUtils b9b69f6 [Jeremy Freeman] Added setter methods c3f8b5a [Jeremy Freeman] Modified logging 00aafdc [Jeremy Freeman] Add modifiers 14b801e [Jeremy Freeman] Name changes c7d38a3 [Jeremy Freeman] Move check for empty data to GradientDescent 4b0a5d3 [Jeremy Freeman] Cleaned up tests 74188d6 [Jeremy Freeman] Eliminate dependency on commons 50dd237 [Jeremy Freeman] Removed experimental tag 6bfe1e6 [Jeremy Freeman] Fixed imports a2a63ad [freeman] Makes convergence test more robust 86220bc [freeman] Streaming linear regression unit tests fb4683a [freeman] Minor changes for scalastyle consistency fd31e03 [freeman] Changed logging behavior 453974e [freeman] Fixed indentation c4b1143 [freeman] Streaming linear regression 604f4d7 [freeman] Expanded private class to include mllib d99aa85 [freeman] Helper methods for streaming MLlib apps 0898add [freeman] Added dependency on streaming |
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