/**
 * Computes the cosine distance (not similarity) between `a` and `b`.
 *
 * @category Metrics
 * @param {number[] | Float64Array} a
 * @param {number[] | Float64Array} b
 * @returns {number} The cosine distance between `a` and `b`.
 * @example
 * import { cosine } from "@saehrimnir/druidjs";
 * const a = [1, 2, 3];
 * const b = [4, 5, 6];
 * const distance = cosine(a, b); // 0.9746318461970762
 */
export function cosine(a: number[] | Float64Array, b: number[] | Float64Array): number;
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