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[SPARK-20501] [ML] ML 2.2 QA: New Scala APIs, docs #17934

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[SPARK-20501] [ML] ML 2.2 QA: New Scala APIs, docs #17934

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ML 2.2 QA: New Scala APIs, docs
yanboliang May 10, 2017
2aab9ba
Fix typo.
yanboliang May 10, 2017
65f22a0
Fix LinearSVC threshold.
yanboliang May 10, 2017
cef372b
Revert the change for StringIndexerModel.
yanboliang May 16, 2017
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5 changes: 3 additions & 2 deletions mllib/src/main/scala/org/apache/spark/ml/classification/LinearSVC.scala
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Expand Up @@ -51,6 +51,7 @@ private[classification] trait LinearSVCParams extends ClassifierParams with HasR
* Linear SVM Classifier</a>
*
* This binary classifier optimizes the Hinge Loss using the OWLQN optimizer.
* Only supports L2 regularization currently.

@felixcheung felixcheung May 11, 2017

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is this something should be mentioned in R too?

@yanboliang yanboliang May 11, 2017 •
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@felixcheung Yeah, it should be. However, since SparkR exposed more MLlib APIs during 2.2 releasing cycle, I'm preparing a separate PR to audit new SparkR MLlib APIs which would include this update. Thanks.

*
*/
@Since("2.2.0")
Expand Down Expand Up @@ -148,7 +149,7 @@ class LinearSVC @Since("2.2.0") (
@Since("2.2.0")
override def copy(extra: ParamMap): LinearSVC = defaultCopy(extra)

override protected[classification] def train(dataset: Dataset[_]): LinearSVCModel = {
override protected def train(dataset: Dataset[_]): LinearSVCModel = {
val w = if (!isDefined(weightCol) || $(weightCol).isEmpty) lit(1.0) else col($(weightCol))
val instances: RDD[Instance] =
dataset.select(col($(labelCol)), w, col($(featuresCol))).rdd.map {
Expand Down Expand Up @@ -264,7 +265,7 @@ object LinearSVC extends DefaultParamsReadable[LinearSVC] {

/**
* :: Experimental ::
* SVM Model trained by [[LinearSVC]]
* Linear SVM Model trained by [[LinearSVC]]
*/
@Since("2.2.0")
@Experimental
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8 changes: 6 additions & 2 deletions mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
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Expand Up @@ -267,8 +267,12 @@ private[classification] trait LogisticRegressionParams extends ProbabilisticClas
}

/**
* Logistic regression. Supports multinomial logistic (softmax) regression and binomial logistic
* regression.
* Logistic regression. Supports:
* - Multinomial logistic (softmax) regression.
* - Binomial logistic regression.
*
* This class supports fitting traditional logistic regression model by LBFGS/OWLQN and
* bound (box) constrained logistic regression model by LBFGSB.
*/
@Since("1.2.0")
class LogisticRegression @Since("1.2.0") (
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14 changes: 8 additions & 6 deletions mllib/src/main/scala/org/apache/spark/ml/feature/Imputer.scala
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Expand Up @@ -102,7 +102,8 @@ private[feature] trait ImputerParams extends Params with HasInputCols {
* computing median, DataFrameStatFunctions.approxQuantile is used with a relative error of 0.001.
*/
@Experimental
class Imputer @Since("2.2.0")(override val uid: String)
@Since("2.2.0")
class Imputer @Since("2.2.0") (@Since("2.2.0") override val uid: String)
extends Estimator[ImputerModel] with ImputerParams with DefaultParamsWritable {

@Since("2.2.0")
Expand Down Expand Up @@ -165,8 +166,8 @@ class Imputer @Since("2.2.0")(override val uid: String)
object Imputer extends DefaultParamsReadable[Imputer] {

/** strategy names that Imputer currently supports. */
private[ml] val mean = "mean"
private[ml] val median = "median"
private[feature] val mean = "mean"
private[feature] val median = "median"

@Since("2.2.0")
override def load(path: String): Imputer = super.load(path)
Expand All @@ -180,9 +181,10 @@ object Imputer extends DefaultParamsReadable[Imputer] {
* which are used to replace the missing values in the input DataFrame.
*/
@Experimental
class ImputerModel private[ml](
override val uid: String,
val surrogateDF: DataFrame)
@Since("2.2.0")
class ImputerModel private[ml] (
@Since("2.2.0") override val uid: String,
@Since("2.2.0") val surrogateDF: DataFrame)
extends Model[ImputerModel] with ImputerParams with MLWritable {

import ImputerModel._
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2 changes: 1 addition & 1 deletion mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala
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Expand Up @@ -146,7 +146,7 @@ object StringIndexer extends DefaultParamsReadable[StringIndexer] {
* This is a temporary fix for the case when target labels do not exist during prediction.
*/
@Since("1.4.0")
class StringIndexerModel (
class StringIndexerModel private[ml] (

@MLnick MLnick May 10, 2017

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Hmm, making this private now will break user code if it is used, no? It's unfortunate that it wasn't private before, but do we want to do this?

@yanboliang yanboliang May 10, 2017

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We make this public by mistake, so I think we should fix this bug. AFAIK, this is the only model whose constructor is public, so there is little chance to break user code. And I think it makes sense to break user code by fixing bug. Thanks.

@jkbradley jkbradley May 16, 2017

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I thought this was made public on purpose. StringIndexerModel is one case where it makes sense for users to create it manually (if they already have a list of the possible Strings).

@yanboliang yanboliang May 16, 2017

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OK, I reverted back. Thanks.

@Since("1.4.0") override val uid: String,
@Since("1.5.0") val labels: Array[String])
extends Model[StringIndexerModel] with StringIndexerBase with MLWritable {
Expand Down
2 changes: 1 addition & 1 deletion mllib/src/main/scala/org/apache/spark/ml/fpm/FPGrowth.scala
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Expand Up @@ -200,7 +200,7 @@ object FPGrowth extends DefaultParamsReadable[FPGrowth] {
@Experimental
class FPGrowthModel private[ml] (
@Since("2.2.0") override val uid: String,
@transient val freqItemsets: DataFrame)
@Since("2.2.0") @transient val freqItemsets: DataFrame)
extends Model[FPGrowthModel] with FPGrowthParams with MLWritable {

/** @group setParam */
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2 changes: 1 addition & 1 deletion mllib/src/main/scala/org/apache/spark/ml/stat/Correlation.scala
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Expand Up @@ -27,7 +27,7 @@ import org.apache.spark.sql.{DataFrame, Dataset, Row}
import org.apache.spark.sql.types.{StructField, StructType}

/**
* API for correlation functions in MLlib, compatible with Dataframes and Datasets.
* API for correlation functions in MLlib, compatible with DataFrames and Datasets.
*
* The functions in this package generalize the functions in [[org.apache.spark.sql.Dataset#stat]]
* to spark.ml's Vector types.
Expand Down
1 change: 1 addition & 0 deletions python/pyspark/ml/classification.py
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Expand Up @@ -70,6 +70,7 @@ class LinearSVC(JavaEstimator, HasFeaturesCol, HasLabelCol, HasPredictionCol, Ha
`Linear SVM Classifier <https://en.wikipedia.org/wiki/Support_vector_machine#Linear_SVM>`_

This binary classifier optimizes the Hinge Loss using the OWLQN optimizer.
Only supports L2 regularization currently.

>>> from pyspark.sql import Row
>>> from pyspark.ml.linalg import Vectors
Expand Down