[mllib] Share the simple benchmark result about the cast cost from Spark vector to Breeze vector

[Yu Ishikawa <yu...@gmail.com>]

Hi all,

I wondered the cast cost from Spark Vectors to Breeze vector is high or low. 
So I benchmarked the simple operation about addition, multiplication and 
division of RDD[Vector] or RDD[BV[Double]]. I share the simple benchmark
result with you.

In conclusion, the cast cost was lower than I had expected. 
For more information, please read the below report, if you are interested in
it.
https://github.com/yu-iskw/benchmark-breeze-on-spark/blob/master/doc%2Fbenchmark-result.md

Best,
Yu Ishikawa



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-- Yu Ishikawa
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