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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var expit = require( '@stdlib/math/base/special/expit' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var NINF = require( '@stdlib/constants/float64/ninf' );
// MAIN //
/**
* Evaluates the Gaussian Error Linear Unit (GELU) activation function using a quick 1.702 approximation.
*
* @param {number} x - input value
* @returns {number} function value
*
* @example
* var v = geluQuick( 0.0 );
* // returns 0.0
*
* @example
* var v = geluQuick( 1.0 );
* // returns ~0.8458
*
* @example
* var v = geluQuick( -Infinity );
* // returns -0.0
*
* @example
* var v = geluQuick( Infinity );
* // returns Infinity
*
* @example
* var v = geluQuick( NaN );
* // returns NaN
*/
function geluQuick( x ) {
if ( isnan( x ) ) {
return NaN;
}
if ( x === NINF ) {
return -0.0;
}
return x * expit( 1.702 * x );
}
// EXPORTS //
module.exports = geluQuick;
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