/**
 * Componentwise computes Softplus activation of given nD tensor with given `k`
 * (sharpness param, should be >= 1). Writes result to `out`. If `out` is null,
 * mutates original. Multi-method.
 *
 * @remarks
 *
 * - Reference: https://en.wikipedia.org/wiki/Softplus
 * - Interactive calculator: https://www.desmos.com/calculator/54pfflbsbv
 *
 * @param out - output tensor
 * @param a - input tensor
 * @param n - sharpness
 */
export declare const softPlus: import("./api.js").MultiTensorOpImpl<import("./api.js").TensorOpTN<number>>;
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