[SPARK-3838][examples][mllib][python] Word2Vec example in python

[AtlasPilotPuppy]

This pull request refers to issue: https://issues.apache.org/jira/browse/SPARK-3838

Python example for word2vec
@mengxr

[AmplabJenkins]

Can one of the admins verify this patch?

[mengxr]

@anantasty Could you also update the example code in https://github.com/apache/spark/blob/master/docs/mllib-feature-extraction.md? Thanks!

[AtlasPilotPuppy]

@mengxr I updated the example code as well.

[mengxr]

The input to Word2Vec should be sentences instead of individual words, though it doesn't affect the implementation. The following command extract 16 words per line.

grep -o -E '\w+(\W+\w+){0,15}' text8 > text8_lines

[AtlasPilotPuppy]

@mengxr I just implemented those changes.
I kept the command line args very simple instead of using arg parse etc just for the sake of simplicity.
Thanks for the review.

[mengxr]

inp -> sentences, [row] -> row.split(' ')

[mengxr]

ok to test

[mengxr]

test this please

[SparkQA]

Test build #22364 has started for PR 2952 at commit 3d3c9ee.

• This patch merges cleanly.

[SparkQA]

Test build #22364 has finished for PR 2952 at commit 3d3c9ee.

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

[AmplabJenkins]

Test FAILed.
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[davies]

use file_path

[AtlasPilotPuppy]

I left that old line in there thanks for that!

[AtlasPilotPuppy]

@davies @mengxr Just made the suggested changes.

[SparkQA]

Test build #22598 has started for PR 2952 at commit 4bd439e.

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[davies]

remove the indent or remove this line.

[SparkQA]

Test build #22598 has finished for PR 2952 at commit 4bd439e.

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[AmplabJenkins]

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[davies]

@mengxr I think it's ready to merge.

[AtlasPilotPuppy]

@mengxr @davies Thanks for the time and guidance

[SparkQA]

Test build #22618 has started for PR 2952 at commit 87bd723.

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[SparkQA]

Test build #22618 has finished for PR 2952 at commit 87bd723.

• 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.

[AtlasPilotPuppy]

The URL shows 0 failures I am not sure why it says the tests fail.

[mengxr]

test this please

[SparkQA]

Test build #22658 has started for PR 2952 at commit 87bd723.

• This patch merges cleanly.

[SparkQA]

Test build #22658 has finished for PR 2952 at commit 87bd723.

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

[AmplabJenkins]

Test PASSed.
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Test PASSed.

[mengxr]

LGTM. Merged into master. Thanks!