org.apache.spark.ml.feature.VectorSlicer Java Examples

The following examples show how to use org.apache.spark.ml.feature.VectorSlicer. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: JavaVectorSlicerExample.java    From SparkDemo with MIT License 5 votes vote down vote up 
public static void main(String[] args) {
  SparkSession spark = SparkSession
    .builder()
    .appName("JavaVectorSlicerExample")
    .getOrCreate();

  // $example on$
  Attribute[] attrs = new Attribute[]{
    NumericAttribute.defaultAttr().withName("f1"),
    NumericAttribute.defaultAttr().withName("f2"),
    NumericAttribute.defaultAttr().withName("f3")
  };
  AttributeGroup group = new AttributeGroup("userFeatures", attrs);

  List<Row> data = Lists.newArrayList(
    RowFactory.create(Vectors.sparse(3, new int[]{0, 1}, new double[]{-2.0, 2.3})),
    RowFactory.create(Vectors.dense(-2.0, 2.3, 0.0))
  );

  Dataset<Row> dataset =
    spark.createDataFrame(data, (new StructType()).add(group.toStructField()));

  VectorSlicer vectorSlicer = new VectorSlicer()
    .setInputCol("userFeatures").setOutputCol("features");

  vectorSlicer.setIndices(new int[]{1}).setNames(new String[]{"f3"});
  // or slicer.setIndices(new int[]{1, 2}), or slicer.setNames(new String[]{"f2", "f3"})

  Dataset<Row> output = vectorSlicer.transform(dataset);
  output.show(false);
  // $example off$

  spark.stop();
}
Example #2
Source File: VectorSlicerConverter.java    From jpmml-sparkml with GNU Affero General Public License v3.0 5 votes vote down vote up 
@Override
public List<Feature> encodeFeatures(SparkMLEncoder encoder){
	VectorSlicer transformer = getTransformer();

	String[] names = transformer.getNames();
	if(names != null && names.length > 0){
		throw new IllegalArgumentException("Expected index mode, got name mode");
	}

	return encoder.getFeatures(transformer.getInputCol(), transformer.getIndices());
}
Example #3
Source File: VectorSlicerConverter.java    From jpmml-sparkml with GNU Affero General Public License v3.0 4 votes vote down vote up 
public VectorSlicerConverter(VectorSlicer transformer){
	super(transformer);
}