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