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Fractional pooling layer #171

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Rudimentary implementation of fractional pooling, as described in http://arxiv.org/abs/1412.6071
Currently only the overlapping random mode is done. I also need to figure out how to add a deterministic mode.

Suggestions on how to do it more efficiently are welcome, it is currently about 4X slower than maxpooling in the best case.

TODO:

  • add some tests
  • implement pseduorandom mode
  • implement disjoint mode
  • figure out a deterministic mode
  • figure out how to support None in input shape

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