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author | Yanbo Liang <ybliang8@gmail.com> | 2015-11-09 08:56:22 -0800 |
---|---|---|
committer | Xiangrui Meng <meng@databricks.com> | 2015-11-09 08:56:22 -0800 |
commit | 8c0e1b50e960d3e8e51d0618c462eed2bb4936f0 (patch) | |
tree | 467a738e59a86e39c1f59f00b1c0bbfffba55e1c /mllib/src | |
parent | b541b31630b1b85b48d6096079d073ccf46a62e8 (diff) | |
download | spark-8c0e1b50e960d3e8e51d0618c462eed2bb4936f0.tar.gz spark-8c0e1b50e960d3e8e51d0618c462eed2bb4936f0.tar.bz2 spark-8c0e1b50e960d3e8e51d0618c462eed2bb4936f0.zip |
[SPARK-11494][ML][R] Expose R-like summary statistics in SparkR::glm for linear regression
Expose R-like summary statistics in SparkR::glm for linear regression, the output of ```summary``` like
```Java
$DevianceResiduals
Min Max
-0.9509607 0.7291832
$Coefficients
Estimate Std. Error t value Pr(>|t|)
(Intercept) 1.6765 0.2353597 7.123139 4.456124e-11
Sepal_Length 0.3498801 0.04630128 7.556598 4.187317e-12
Species_versicolor -0.9833885 0.07207471 -13.64402 0
Species_virginica -1.00751 0.09330565 -10.79796 0
```
Author: Yanbo Liang <ybliang8@gmail.com>
Closes #9561 from yanboliang/spark-11494.
Diffstat (limited to 'mllib/src')
-rw-r--r-- | mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala | 50 |
1 files changed, 46 insertions, 4 deletions
diff --git a/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala b/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala index 5be2f86936..4d82b90bfd 100644 --- a/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala +++ b/mllib/src/main/scala/org/apache/spark/ml/r/SparkRWrappers.scala @@ -53,10 +53,35 @@ private[r] object SparkRWrappers { def getModelCoefficients(model: PipelineModel): Array[Double] = { model.stages.last match { + case m: LinearRegressionModel => { + val coefficientStandardErrorsR = Array(m.summary.coefficientStandardErrors.last) ++ + m.summary.coefficientStandardErrors.dropRight(1) + val tValuesR = Array(m.summary.tValues.last) ++ m.summary.tValues.dropRight(1) + val pValuesR = Array(m.summary.pValues.last) ++ m.summary.pValues.dropRight(1) + if (m.getFitIntercept) { + Array(m.intercept) ++ m.coefficients.toArray ++ coefficientStandardErrorsR ++ + tValuesR ++ pValuesR + } else { + m.coefficients.toArray ++ coefficientStandardErrorsR ++ tValuesR ++ pValuesR + } + } + case m: LogisticRegressionModel => { + if (m.getFitIntercept) { + Array(m.intercept) ++ m.coefficients.toArray + } else { + m.coefficients.toArray + } + } + } + } + + def getModelDevianceResiduals(model: PipelineModel): Array[Double] = { + model.stages.last match { case m: LinearRegressionModel => - Array(m.intercept) ++ m.coefficients.toArray + m.summary.devianceResiduals case m: LogisticRegressionModel => - Array(m.intercept) ++ m.coefficients.toArray + throw new UnsupportedOperationException( + "No deviance residuals available for LogisticRegressionModel") } } @@ -65,11 +90,28 @@ private[r] object SparkRWrappers { case m: LinearRegressionModel => val attrs = AttributeGroup.fromStructField( m.summary.predictions.schema(m.summary.featuresCol)) - Array("(Intercept)") ++ attrs.attributes.get.map(_.name.get) + if (m.getFitIntercept) { + Array("(Intercept)") ++ attrs.attributes.get.map(_.name.get) + } else { + attrs.attributes.get.map(_.name.get) + } case m: LogisticRegressionModel => val attrs = AttributeGroup.fromStructField( m.summary.predictions.schema(m.summary.featuresCol)) - Array("(Intercept)") ++ attrs.attributes.get.map(_.name.get) + if (m.getFitIntercept) { + Array("(Intercept)") ++ attrs.attributes.get.map(_.name.get) + } else { + attrs.attributes.get.map(_.name.get) + } + } + } + + def getModelName(model: PipelineModel): String = { + model.stages.last match { + case m: LinearRegressionModel => + "LinearRegressionModel" + case m: LogisticRegressionModel => + "LogisticRegressionModel" } } } |