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Optimizes NN model serialization #298

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Optimizes NN model serialization #298

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Commits on Jun 27, 2016

  1. Optimizes NN model serialization 

    * Reserves a vector/unordered_map's memory to avoid resize/rehash
* abstract_columns<bit_vector> serializes to a raw type instead of an array

Performance (lsh, 2048bit, 10000000 records)
  size: 3020.78 => 2715.60 [MiB] (10% smaller)
  load: 14969.7 =>  6967.9 [ms]  (x2.15 faster)
  save: 4686.22 =>  2341.5 [ms]  (x2.00 faster)
    Kazuki OIKAWA committed Jun 27, 2016
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