/**
 * Computes the canberra distance between `a` and `b`.
 *
 * @category Metrics
 * @param {number[] | Float64Array} a
 * @param {number[] | Float64Array} b
 * @returns {number} The canberra distance between `a` and `b`.
 * @see {@link https://en.wikipedia.org/wiki/Canberra_distance}
 */
export function canberra(a: number[] | Float64Array, b: number[] | Float64Array): number;
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