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Please predict whether this patent is acceptable.PATENT ABSTRACT: Technologies are generally described for methods and systems in a machine learning environment. In an example, a method may include receiving training data and test data. The method may also include determining a set of out of sample errors based on the training data and test data. The method may also include determining a set of gradient values based on the out of sample errors. Each gradient value may relate to a first magnitude and to a second magnitude. The first magnitude may be associated with the set of out of sample errors. The second magnitude may be associated with out of sample errors of a portion of the training data excluding a particular point of the test data. The method may also include transforming the set of gradient values into modified density data. The method may also include generating alternative training data based on the modified density data.