Build an anchor contrast from prototype feature sets

Build an anchor contrast from prototype feature sets

Usage

dkge_anchor_contrast_from_prototypes(
  anchors,
  positives,
  negatives = NULL,
  sigma = NULL,
  normalize = TRUE
)

Arguments

anchors

Matrix of anchor coordinates (`L x d`).

positives

Matrix (or vector) of positive prototypes in feature space.

negatives

Optional matrix (or vector) of negative prototypes.

sigma

Optional bandwidth for the prototype kernel. Defaults to the median distance between anchors and prototypes.

normalize

Logical; L2-normalise the resulting contrast.

Value

Numeric vector of length `L` suitable for [dkge_contrast()].

Examples

anchors <- matrix(rnorm(10 * 4), 10, 4)
pos <- anchors[1:2, , drop = FALSE]
neg <- anchors[3:4, , drop = FALSE]
w <- dkge_anchor_contrast_from_prototypes(anchors, positives = pos, negatives = neg)
length(w)
#> [1] 10