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Convert FTRL code to a core datatable class (#1417)
FTRL code has been converted into a core datatable class: - added `fit` and `predict` methods for training and making predictions; - added `reset` method to reset the model; - added getters and setters for all the model parameters; - the `model` itself can now be returned and loaded as a separate frame; - some other refactoring and modifications. The algo itself was also slightly optimized, however, it still gets the same score on Kaggle. So we're ok from the accuracy point of view.
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