search for: original_instance

Is there a built-in way to determine if a model object has just been created (ie. this object was the one that was originally persisted)? I can''t see it anywhere in the AR code, but thought I''d check. I want something like: p = Person.create p.original_instance? # true Is this built-in or should I just patch AR? -Jonathan.

...er of each class is not enough to obtain a good accuracy using some classifiers( svm, rna, knn) I need to "oversampling" the number of instances of each class. I have heard that there is a method to do this. It consists in generating these new instances as follows: new_instance <---- original_instance + u(epsilon) U(epsilon) is a uniform number in the range [-epsilon,epsilon] and this number is applied to each feature of the dataset to obtain a new instance without modified the original class. Anybody has used this method to "oversampling" his data? Anybody has more information abou...