/**
 * Componentwise computes Sigmoid activation of given nD tensor. Writes result
 * to `out`. If `out` is null, mutates original. Multi-method.
 *
 * Reference: https://en.wikipedia.org/wiki/Sigmoid_function
 *
 * @param out - output tensor
 * @param a - input tensor
 */
export declare const sigmoid: import("./api.js").MultiTensorOpImpl<import("./api.js").TensorOpT<number>>;
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