Object

com.spotify.featran.transformers

PolynomialExpansion

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object PolynomialExpansion extends Serializable

Transform vector features by expanding them into a polynomial space, which is formulated by an n-degree combination of original dimensions.

Missing values are transformed to zero vectors.

When using aggregated feature summary from a previous session, vectors of different dimensions are transformed to zero vectors and FeatureRejection.WrongDimension rejections are reported.

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  1. final def !=(arg0: Any): Boolean

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  4. def apply(name: String, degree: Int = 2, expectedLength: Int = 0): Transformer[Array[Double], Int, Int]

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    Create a new PolynomialExpansion instance.

    Create a new PolynomialExpansion instance.

    degree

    the polynomial degree to expand, which should be greater than or equal to 1

    expectedLength

    expected length of the input vectors, or 0 to infer from data

  5. final def asInstanceOf[T0]: T0

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  8. def equals(arg0: Any): Boolean

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  9. def expand(v: Array[Double], degree: Int): Array[Double]

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  10. def finalize(): Unit

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  18. def toString(): String

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