[SPARK-4891][PySpark][MLlib] Add gamma/log normal/exp dist sampling to P...

[rnowling]

...ySpark MLlib

This is a follow up to PR3680 #3680 .

[SparkQA]

Test build #25237 has started for PR 3955 at commit 174beab.

• This patch merges cleanly.

[SparkQA]

Test build #25237 has finished for PR 3955 at commit 174beab.

• This patch fails Python style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test FAILed.
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Test FAILed.

[SparkQA]

Test build #25238 has started for PR 3955 at commit 7a01a78.

• This patch merges cleanly.

[SparkQA]

Test build #25238 has finished for PR 3955 at commit 7a01a78.

• This patch fails Python style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test FAILed.
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Test FAILed.

[SparkQA]

Test build #25239 has started for PR 3955 at commit 1236a01.

• This patch merges cleanly.

[SparkQA]

Test build #25239 has finished for PR 3955 at commit 1236a01.

• This patch fails PySpark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test FAILed.
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Test FAILed.

[rnowling]

@mengxr The test failures seem to be unrelated to my changes -- they were in streaming, but I modified rand.

[mengxr]

Let's retry Jenkins, test this please.

[SparkQA]

Test build #25254 has started for PR 3955 at commit 1236a01.

• This patch merges cleanly.

[rnowling]

Thanks, @mengxr !

[SparkQA]

Test build #25254 has finished for PR 3955 at commit 1236a01.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test FAILed.
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Test FAILed.

[mengxr]

@rnowling The code LGTM, but let's make Jenkins happy. Since you are on the whitelist, I think you should be able to trigger Jenkins by "test this please".

[SparkQA]

Test build #25262 has started for PR 3955 at commit 1236a01.

• This patch merges cleanly.

[rnowling]

Jenkins, test this please.

[SparkQA]

Test build #25264 has started for PR 3955 at commit 1236a01.

• This patch merges cleanly.

[SparkQA]

Test build #25262 has finished for PR 3955 at commit 1236a01.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

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Test PASSed.
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Test PASSed.

[SparkQA]

Test build #25264 has finished for PR 3955 at commit 1236a01.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

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Test PASSed.
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[rnowling]

@mengxr tested passed! :)

[mengxr]

Merged into master. Thanks!