Parallelize training for RegexTokenizer#5
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Calculating bigram frequencies (
update_stats()) andmerge()can easily be done in parallel when training a RegexTokenizer by splitting theidsvector into chunks and having multiple threads performing the operations simultaneously on each chunk. The order of thestatsIndexMap is still preserved here as the threads are joined sequentially.On a 75MB dataset, this change reduced the training time taken for 400 merges from ~8mins down to ~3.5min on a 6 core 12 thread CPU.