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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 max = require( '@stdlib/math/base/special/max' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
// MAIN //
/**
* Computes the hinge loss between two double-precision floating-point number.
*
* @private
* @param {number} y - true target value
* @param {number} p - predicted value
* @returns {number} hinge loss
*
* @example
* var v = hinge( 1.0, 0.782 );
* // returns ~0.218
*
* @example
* var v = hinge( 1.0, 0.202 );
* // returns 0.798
*
* @example
* var v = hinge( -1.0, -0.999 );
* // returns ~0.001
*
* @example
* var v = hinge( -1.0, 0.234 );
* // returns 1.234
*
* @example
* var v = hinge( -1.0, 0.2 );
* // returns 1.2
*
* @example
* var v = hinge( 1.0, -0.9 );
* // returns 1.9
*/
function hinge( y, p ) {
if ( isnan( y ) || isnan( p ) ) {
return NaN;
}
if ( y !== -1.0 && y !== 1.0 ) {
return NaN;
}
return max( 0, 1 - ( y*p ) );
}
// EXPORTS //
module.exports = hinge;
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