[SPARK-4259][MLlib]: Add Power Iteration Clustering Algorithm with Gaussian Similarity Function#4254

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fjiang6 wants to merge 31 commits intoapache:masterfrom

Huawei-Spark:PIC

Commits on Jan 22, 2015

Commits on Jan 24, 2015

First end to end working PIC
sboeschhuawei
committed

Commits on Jan 25, 2015

Commits on Jan 28, 2015

Converted custom Linear Algebra datatypes/routines to use Breeze.
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Converted from custom Linalg routines to Breeze: added JavaDoc comments; added Markdown documentation
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Added mllib specific log4j
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Added link to PIC doc from the main clustering md doc
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fixed incorrect markdown in clustering doc
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Add assert to testcase on cluster sizes
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Change last two println's to log4j logger
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Applied Xiangrui's comments - especially removing RDD/PICLinalg classes and making noncritical methods private
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removed matplot.py and reordered all private methods to bottom of PIC
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Remove unused testing data files
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Incorporate Xiangrui's first set of PR comments except restructure PIC.run to take Graph but do not remove Gaussian
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Commits on Jan 29, 2015