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From WangJianfei <>
Subject Re: Reduce the memory usage if we do same first in GradientBoostedTrees if subsamplingRate< 1.0
Date Wed, 16 Nov 2016 01:05:55 GMT
with ,we get RDD data,  so we can just do a sample on
predError or input, if so, we can't use zip(the elements number must be the
same in each partition),thank you!

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