[SPARK-7146][ML] Expose the common params as a DeveloperAPI for other ML developers

[holdenk]

What changes were proposed in this pull request?

Expose the common params from Spark ML as a Developer API.

How was this patch tested?

Existing tests.

[SparkQA]

Test build #79825 has finished for PR 18699 at commit 1ee22f0.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
• |trait Has$Name extends Params
• trait HasRegParam extends Params
• trait HasMaxIter extends Params
• trait HasFeaturesCol extends Params
• trait HasLabelCol extends Params
• trait HasPredictionCol extends Params
• trait HasRawPredictionCol extends Params
• trait HasProbabilityCol extends Params
• trait HasVarianceCol extends Params
• trait HasThreshold extends Params
• trait HasThresholds extends Params
• trait HasInputCol extends Params
• trait HasInputCols extends Params
• trait HasOutputCol extends Params
• trait HasCheckpointInterval extends Params
• trait HasFitIntercept extends Params
• trait HasHandleInvalid extends Params
• trait HasStandardization extends Params
• trait HasSeed extends Params
• trait HasElasticNetParam extends Params
• trait HasTol extends Params
• trait HasStepSize extends Params
• trait HasWeightCol extends Params
• trait HasSolver extends Params
• trait HasAggregationDepth extends Params

[MLnick]

Should probably be "This trait"?

[holdenk]

Good point.

[holdenk]

cc @jkbradley

[holdenk]

And updated after being called out in a talk and Spark Summit :p

[SparkQA]

Test build #83042 has finished for PR 18699 at commit a53c460.

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

[holdenk]

Jenkins retest this please

[SparkQA]

Test build #83470 has finished for PR 18699 at commit c6a7ddf.

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

[holdenk]

Merged into master