[SPARK-3516] [mllib] DecisionTree: Add minInstancesPerNode, minInfoGain params to example and Python API#2349

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jkbradley wants to merge 23 commits intoapache:masterfrom

jkbradley:chouqin-dt-preprune

Commits on Sep 9, 2014

add min info gain and min instances per node parameters in decision tree
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separate calculation of predict of node from calculation of info gain
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fix bug
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fix style
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fix style
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add comments
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fix bug
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add api docs
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Merge branch 'master' of https://github.com/apache/spark into dt-preprune
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minor fix: remove empty lines
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fix style
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fix bug
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fix docs and change minInstancesPerNode to 1
chouqin
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Commits on Sep 10, 2014

Commits on Sep 13, 2014