diff options
| -rw-r--r-- | mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala | 2 | ||||
| -rw-r--r-- | mllib/src/main/scala/org/apache/spark/ml/param/params.scala | 15 | ||||
| -rw-r--r-- | python/pyspark/ml/feature.py | 77 |
3 files changed, 92 insertions, 2 deletions
diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala index b28c88aaae..e52d797293 100644 --- a/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala +++ b/mllib/src/main/scala/org/apache/spark/ml/feature/Bucketizer.scala @@ -48,7 +48,7 @@ final class Bucketizer private[ml] (override val parent: Estimator[Bucketizer]) * otherwise, values outside the splits specified will be treated as errors. * @group param */ - val splits: Param[Array[Double]] = new Param[Array[Double]](this, "splits", + val splits: DoubleArrayParam = new DoubleArrayParam(this, "splits", "Split points for mapping continuous features into buckets. With n+1 splits, there are n " + "buckets. A bucket defined by splits x,y holds values in the range [x,y) except the last " + "bucket, which also includes y. The splits should be strictly increasing. " + diff --git a/mllib/src/main/scala/org/apache/spark/ml/param/params.scala b/mllib/src/main/scala/org/apache/spark/ml/param/params.scala index 7ebbf106ee..5a7ec29aac 100644 --- a/mllib/src/main/scala/org/apache/spark/ml/param/params.scala +++ b/mllib/src/main/scala/org/apache/spark/ml/param/params.scala @@ -219,7 +219,7 @@ class BooleanParam(parent: Params, name: String, doc: String) // No need for isV override def w(value: Boolean): ParamPair[Boolean] = super.w(value) } -/** Specialized version of [[Param[Array[T]]]] for Java. */ +/** Specialized version of [[Param[Array[String]]]] for Java. */ class StringArrayParam(parent: Params, name: String, doc: String, isValid: Array[String] => Boolean) extends Param[Array[String]](parent, name, doc, isValid) { @@ -232,6 +232,19 @@ class StringArrayParam(parent: Params, name: String, doc: String, isValid: Array def w(value: java.util.List[String]): ParamPair[Array[String]] = w(value.asScala.toArray) } +/** Specialized version of [[Param[Array[Double]]]] for Java. */ +class DoubleArrayParam(parent: Params, name: String, doc: String, isValid: Array[Double] => Boolean) + extends Param[Array[Double]](parent, name, doc, isValid) { + + def this(parent: Params, name: String, doc: String) = + this(parent, name, doc, ParamValidators.alwaysTrue) + + override def w(value: Array[Double]): ParamPair[Array[Double]] = super.w(value) + + /** Creates a param pair with a [[java.util.List]] of values (for Java and Python). */ + def w(value: java.util.List[Double]): ParamPair[Array[Double]] = w(value.asScala.toArray) +} + /** * A param amd its value. */ diff --git a/python/pyspark/ml/feature.py b/python/pyspark/ml/feature.py index f35bc1463d..30e1fd4922 100644 --- a/python/pyspark/ml/feature.py +++ b/python/pyspark/ml/feature.py @@ -84,6 +84,83 @@ class Binarizer(JavaTransformer, HasInputCol, HasOutputCol): @inherit_doc +class Bucketizer(JavaTransformer, HasInputCol, HasOutputCol): + """ + Maps a column of continuous features to a column of feature buckets. + + >>> df = sqlContext.createDataFrame([(0.1,), (0.4,), (1.2,), (1.5,)], ["values"]) + >>> bucketizer = Bucketizer(splits=[-float("inf"), 0.5, 1.4, float("inf")], + ... inputCol="values", outputCol="buckets") + >>> bucketed = bucketizer.transform(df).collect() + >>> bucketed[0].buckets + 0.0 + >>> bucketed[1].buckets + 0.0 + >>> bucketed[2].buckets + 1.0 + >>> bucketed[3].buckets + 2.0 + >>> bucketizer.setParams(outputCol="b").transform(df).head().b + 0.0 + """ + + _java_class = "org.apache.spark.ml.feature.Bucketizer" + # a placeholder to make it appear in the generated doc + splits = \ + Param(Params._dummy(), "splits", + "Split points for mapping continuous features into buckets. With n+1 splits, " + + "there are n buckets. A bucket defined by splits x,y holds values in the " + + "range [x,y) except the last bucket, which also includes y. The splits " + + "should be strictly increasing. Values at -inf, inf must be explicitly " + + "provided to cover all Double values; otherwise, values outside the splits " + + "specified will be treated as errors.") + + @keyword_only + def __init__(self, splits=None, inputCol=None, outputCol=None): + """ + __init__(self, splits=None, inputCol=None, outputCol=None) + """ + super(Bucketizer, self).__init__() + #: param for Splitting points for mapping continuous features into buckets. With n+1 splits, + # there are n buckets. A bucket defined by splits x,y holds values in the range [x,y) + # except the last bucket, which also includes y. The splits should be strictly increasing. + # Values at -inf, inf must be explicitly provided to cover all Double values; otherwise, + # values outside the splits specified will be treated as errors. + self.splits = \ + Param(self, "splits", + "Split points for mapping continuous features into buckets. With n+1 splits, " + + "there are n buckets. A bucket defined by splits x,y holds values in the " + + "range [x,y) except the last bucket, which also includes y. The splits " + + "should be strictly increasing. Values at -inf, inf must be explicitly " + + "provided to cover all Double values; otherwise, values outside the splits " + + "specified will be treated as errors.") + kwargs = self.__init__._input_kwargs + self.setParams(**kwargs) + + @keyword_only + def setParams(self, splits=None, inputCol=None, outputCol=None): + """ + setParams(self, splits=None, inputCol=None, outputCol=None) + Sets params for this Bucketizer. + """ + kwargs = self.setParams._input_kwargs + return self._set(**kwargs) + + def setSplits(self, value): + """ + Sets the value of :py:attr:`splits`. + """ + self.paramMap[self.splits] = value + return self + + def getSplits(self): + """ + Gets the value of threshold or its default value. + """ + return self.getOrDefault(self.splits) + + +@inherit_doc class HashingTF(JavaTransformer, HasInputCol, HasOutputCol, HasNumFeatures): """ Maps a sequence of terms to their term frequencies using the |