I am looking for large datasets to investigate classification on time-dependent data where the data's features change over time.

An example of this might be a large spam dataset that covers a clear change in trends over time of constructing spam that can by-pass spam classifiers.

In other words are their any publicly available datasets available where it is clear that a classifier might have to be re-trained after a period of time to cope with feature changes?

  • What formats can you handle? – user4293 Dec 6 '16 at 16:23
  • The format doesn't really matter. – MattLBeck Dec 6 '16 at 16:35

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