Optimizes NN model serialization #298
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* 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)
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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)
This change breaks a model compatibility.