gx

chenyc

2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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/**
 * @license
 * Copyright 2020 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 { util } from '@tensorflow/tfjs-core';
import { FFTProgram } from '../fft_gpu';
import { complex } from './Complex';
import { reshape } from './Reshape';
export function fftImpl(x, inverse, backend) {
    const xData = backend.texData.get(x.dataId);
    const inputSize = util.sizeFromShape(x.shape);
    // Collapse all outer dimensions to a single batch dimension.
    const innerDimensionSize = x.shape[x.shape.length - 1];
    const batch = inputSize / innerDimensionSize;
    const input2D = reshape({ inputs: { x }, backend, attrs: { shape: [batch, innerDimensionSize] } });
    const xShape = input2D.shape;
    const realProgram = new FFTProgram('real', xShape, inverse);
    const imagProgram = new FFTProgram('imag', xShape, inverse);
    const inputs = [
        {
            dataId: xData.complexTensorInfos.real.dataId,
            dtype: xData.complexTensorInfos.real.dtype,
            shape: xShape
        },
        {
            dataId: xData.complexTensorInfos.imag.dataId,
            dtype: xData.complexTensorInfos.imag.dtype,
            shape: xShape
        }
    ];
    const realPart = backend.runWebGLProgram(realProgram, inputs, 'float32');
    const imagPart = backend.runWebGLProgram(imagProgram, inputs, 'float32');
    const complexOutput = complex({ inputs: { real: realPart, imag: imagPart }, backend });
    backend.disposeIntermediateTensorInfo(realPart);
    backend.disposeIntermediateTensorInfo(imagPart);
    const complexOutputReshaped = reshape({ inputs: { x: complexOutput }, backend, attrs: { shape: x.shape } });
    backend.disposeIntermediateTensorInfo(input2D);
    backend.disposeIntermediateTensorInfo(complexOutput);
    return complexOutputReshaped;
}
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