[jvm-packages] support distributed synchronization of customized evaluation metrics#4280

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CodingCat wants to merge 39 commits intodmlc:masterfrom CodingCat:distributed_custom_eval_metrics

+1,066-500

Commits on Apr 18, 2019

add JNI stub
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temp
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temp
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basic framework
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fixing metrics adding logic
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investigation
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fix refernce problem
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fix race condition when registering new customized functions
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temporarily to private dmlc-core
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update dmlc-core
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support multi_classes
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try to fix double free
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investigate
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fix compilation
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test
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thread safe registering
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up
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copy constructor
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fix lambda syntax
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recover some changes
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fix race condition
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fix cuda build
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add ranking
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add unit test
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move files
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make lint happy
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make lint further happy
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fix windows build
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windows build
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add docs
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support both 4j and 4j-spark
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recover header
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address comments
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update file names
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sync with upstream
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Commits on Apr 19, 2019