import { type Mat } from "../math/linalg.js";
export interface PldaParams {
    ldaDim: number;
    scalePre: number;
    scalePost: number;
    /** xvec_transform.npz */
    xvecTf: {
        mean1: Float64Array;
        mean2: Float64Array;
        lda: Mat;
    };
    /** Post-eigh PLDA matrices */
    plda: {
        mu: Float64Array;
        tr: Mat;
        psi: Float64Array;
    };
}
export declare function loadPldaParams(json: unknown): PldaParams;
/**
 * x-vector transformation:
 *   y = (x - mean1)
 *   y = scalePre * L2(y)              # (N, 256)
 *   y = y @ lda                       # (N, 128)
 *   y = y - mean2
 *   y = scalePost * L2(y)             # (N, 128)
 */
export declare function xvecTransform(embeddings: Mat, p: PldaParams): Mat;
/**
 * PLDA latent projection (post-eigh):
 *   y = (x - mu) @ tr.T               # (N, 128)
 */
export declare function pldaTransform(features: Mat, p: PldaParams): Mat;
/** Full PLDA pipeline: 256d ResNet embeddings -> 128d PLDA features. */
export declare function pldaApply(embeddings: Mat, p: PldaParams): Mat;
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