@tensorflow/tfjs-core
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Hardware-accelerated JavaScript library for machine intelligence
31 lines • 1.33 kB
JavaScript
/**
* @license
* Copyright 2019 Google LLC. All Rights Reserved.
* 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.
* =============================================================================
*/
import { tensor1d } from './tensor1d';
export function enclosingPowerOfTwo(value) {
// Return 2**N for integer N such that 2**N >= value.
return Math.floor(Math.pow(2, Math.ceil(Math.log(value) / Math.log(2.0))));
}
export function cosineWindow(windowLength, a, b) {
const even = 1 - windowLength % 2;
const newValues = new Float32Array(windowLength);
for (let i = 0; i < windowLength; ++i) {
const cosArg = (2.0 * Math.PI * i) / (windowLength + even - 1);
newValues[i] = a - b * Math.cos(cosArg);
}
return tensor1d(newValues, 'float32');
}
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