[Spark-11968][ML][MLLIB]Optimize MLLIB ALS recommendForAll#17742

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mpjlu wants to merge 9 commits intoapache:masterfrom

mpjlu:OptimizeAls

Commits on Apr 24, 2017

Optimize ALS recommendForAll
Peng
committed
change breaze.min to math.min
Peng
committed

Commits on Apr 26, 2017

use BoundedProrityQueue to replace ProrityQueue
Peng Meng
committed
change code format
Peng Meng
committed

Commits on Apr 28, 2017

improve the comments of the code
Peng
committed
fix typo
Peng
committed
fix indent 4 space
Peng
committed

Commits on May 3, 2017

move PriorityQueue out of foreach, improve comments
Peng Meng
committed

Commits on May 4, 2017

match comments with PR 17854
Peng Meng
committed