[SPARK-18286][ML] Add Scala/Java examples for MinHash and RandomProjection

[jiayue-zhang]

What changes were proposed in this pull request?

Add Scala/Java/Python examples for MinHash and RandomProjection

How was this patch tested?

./bin/run-example ml.MinHashExample
./bin/run-example ml.JavaMinHashExample
./bin/run-example ml.RandomProjectionExample
./bin/run-example ml.JavaRandomProjectionExample

[yanboliang]

@jkbradley @MLnick @srowen Could you help to add @bravo-zhang to whitelist? Thanks.

[srowen]

Jenkins add to whitelist

[srowen]

Looking good, excepting that there are no python examples?

[yanboliang]

@srowen The Python API is still waiting for review at #15768. Would you mind to take a look? Thanks.

[SparkQA]

Test build #68271 has finished for PR 15787 at commit 8a086a0.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • public class JavaMinHashExample
  • public class JavaRandomProjectionExample

[srowen]

OK, to keep this straight: let's remove "Python" from this JIRA and PR and get it in. The Python API JIRA, SPARK-18010, should also add examples if possible.

However this seems to overlap with SPARK-18081. I think this needs to coordinate what examples are being added.

[SparkQA]

Test build #68282 has finished for PR 15787 at commit 78593e5.

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

[srowen]

It looks OK to me, though given how much is being discussed in SPARK-18081 it might even be better to make sure this is consistent with its outcome, which also includes examples.

[jkbradley]

Linking [https://issues.apache.org/jira/browse/SPARK-18392] since it will alter the public API for LSH

[jiayue-zhang]

This PR can be closed since #15795 has merged

[jkbradley]

Ah, thank you @bravo-zhang !