[WIP][MLLIB][SPARK-4675][SPARK-4823]RowSimilarity#6213

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debasish83 wants to merge 17 commits intoapache:masterfrom

debasish83:similarity

Commits on May 17, 2015

blocked kernalized row similarity calculation and tests
Debasish Das
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Cosine, Euclidean, RBF and Product Kernel added
Debasish Das
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row similarity API added to drive MatrixFactorizationModel similarUsers and similarProducts
Debasish Das
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MovieLens flow to demonstrate item similarity calculation using raw features and ALS factors
Debasish Das
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import cleanup
Debasish Das
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Merge branch 'similarity' of https://github.com/debasish83/spark into similarity
Debasish Das
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Commits on May 23, 2015

Cleaned EuclideanKernel since PowerIterationClustering flow uses RBF
Debasish Das
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IndexedRowMatrix refactor: rowSimilarity is only exposed as public API
Debasish Das
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recommendAll generalized for user->item (product kernel), user->user and item->item (cosine kernel)
Debasish Das
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testcases for similarUsers, similarProducts
Debasish Das
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scalastyle cleanup
Debasish Das
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recommendAll changed back to recommendForAll
Debasish Das
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newline character added
Debasish Das
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scalastyle fix
Debasish Das
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Commits on May 24, 2015

examples updated with row and column based flow and comparison with ALS for low rank item similarity calculation
Debasish Das
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Commits on Jul 24, 2015

use coalesce in place of repartition to avoid shuffle
Debasish Das
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cleaned caches for runtime/shuffle benchmark; added topk option in similarity example
Debasish Das
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