[SPARK-13034] Add export/import for all estimators and transformers(w…

[GayathriMurali]

What changes were proposed in this pull request?

Add export/import for all estimators and transformers(which have Scala implementation) under pyspark/ml/classification.py.

JIRA : https://issues.apache.org/jira/browse/SPARK-13034

How was this patch tested?

Unit tests added to tests.py

…hich have Scala implementation) under pyspark/ml/classification.py

[AmplabJenkins]

Can one of the admins verify this patch?

[wangmiao1981]

Hi Gayathri,

I put my comments in the JIRA about 2 weeks ago and worked with Yanbo on putting some code.

Can we work together to get it merged? I can close my PR if needed. By the way, what is the best way to notify people that I am working on some JIRA and we will not spend time on the same JIRA in the future.

Thanks!

Miao

[GayathriMurali]

@wangmiao1981 Sorry about that. I did see your comments and since there wasnt any pull request, I went ahead and sent one. We could definitely work together to get this merged.

[wangmiao1981]

@GayathriMurali Thanks! I see you add one more classification other than logisticregression and navie bayes. When I was working on my code base, that classifier doesn't have scala import/export support yet. I think yours is more recent than mine.

[GayathriMurali]

@yanboliang Can you please help review this PR?

[jkbradley]

@GayathriMurali @wangmiao1981 It will be great to add persistence for LogisticRegression and NaiveBayes. The other algorithms will need to wait since they do not yet have Scala support for persistence. Could you please reconcile your 2 PRs? It would be great to close one and have both of you collaborate on 1 PR. Thanks!

[GayathriMurali]

@wangmiao1981 I can close my PR and we can may be work on yours?