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org.apache.spark.ml.stat

Summarizer

object Summarizer extends Logging

Tools for vectorized statistics on MLlib Vectors.

The methods in this package provide various statistics for Vectors contained inside DataFrames.

This class lets users pick the statistics they would like to extract for a given column. Here is an example in Scala:

import org.apache.spark.ml.linalg._
import org.apache.spark.sql.Row
val dataframe = ... // Some dataframe containing a feature column and a weight column
val multiStatsDF = dataframe.select(
    Summarizer.metrics("min", "max", "count").summary($"features", $"weight")
val Row(Row(minVec, maxVec, count)) = multiStatsDF.first()

If one wants to get a single metric, shortcuts are also available:

val meanDF = dataframe.select(Summarizer.mean($"features"))
val Row(meanVec) = meanDF.first()

Note: Currently, the performance of this interface is about 2x~3x slower than using the RDD interface.

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@Experimental() @Since( "2.3.0" )
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  6. def count(col: Column): Column
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    @Since( "2.3.0" )
  7. def count(col: Column, weightCol: Column): Column
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  29. def max(col: Column): Column
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  30. def max(col: Column, weightCol: Column): Column
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  31. def mean(col: Column): Column
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  32. def mean(col: Column, weightCol: Column): Column
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  33. def metrics(metrics: String*): SummaryBuilder

    Given a list of metrics, provides a builder that it turns computes metrics from a column.

    Given a list of metrics, provides a builder that it turns computes metrics from a column.

    See the documentation of Summarizer for an example.

    The following metrics are accepted (case sensitive):

    • mean: a vector that contains the coefficient-wise mean.
    • variance: a vector tha contains the coefficient-wise variance.
    • count: the count of all vectors seen.
    • numNonzeros: a vector with the number of non-zeros for each coefficients
    • max: the maximum for each coefficient.
    • min: the minimum for each coefficient.
    • normL2: the Euclidean norm for each coefficient.
    • normL1: the L1 norm of each coefficient (sum of the absolute values).
    metrics

    metrics that can be provided.

    returns

    a builder.

    Annotations
    @Since( "2.3.0" ) @varargs()
    Exceptions thrown

    IllegalArgumentException if one of the metric names is not understood. Note: Currently, the performance of this interface is about 2x~3x slower then using the RDD interface.

  34. def min(col: Column): Column
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  35. def min(col: Column, weightCol: Column): Column
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  36. final def ne(arg0: AnyRef): Boolean
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  37. def normL1(col: Column): Column
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  38. def normL1(col: Column, weightCol: Column): Column
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  39. def normL2(col: Column): Column
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  40. def normL2(col: Column, weightCol: Column): Column
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  43. def numNonZeros(col: Column): Column
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  44. def numNonZeros(col: Column, weightCol: Column): Column
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  47. def variance(col: Column): Column
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  48. def variance(col: Column, weightCol: Column): Column
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