/**
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* @license
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* Copyright 2020 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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import {backend_util, GatherV2, GatherV2Attrs, GatherV2Inputs, KernelConfig, scalar, Tensor, TypedArray, util} from '@tensorflow/tfjs';
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import {createTensorsTypeOpAttr, NodeJSKernelBackend} from '../nodejs_kernel_backend';
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export const gatherV2Config: KernelConfig = {
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kernelName: GatherV2,
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backendName: 'tensorflow',
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kernelFunc: (args) => {
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const {x, indices} = args.inputs as GatherV2Inputs;
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const backend = args.backend as NodeJSKernelBackend;
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const {axis, batchDims} = args.attrs as unknown as GatherV2Attrs;
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// Throw error when any index is out of bound.
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const indicesVals = backend.readSync(indices.dataId) as TypedArray;
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const axisDim = x.shape[axis];
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for (let i = 0; i < indicesVals.length; ++i) {
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const index = indicesVals[i];
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util.assert(
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index <= axisDim - 1 && index >= 0,
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() => `GatherV2: the index value ${index} is not in [0, ${
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axisDim - 1}]`);
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}
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// validate the inputs
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backend_util.segment_util.collectGatherOpShapeInfo(
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x as Tensor, indices as Tensor, axis, batchDims);
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const axisTensor = scalar(axis, 'int32');
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const opAttrs = [
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{name: 'batch_dims', type: backend.binding.TF_ATTR_INT, value: batchDims},
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createTensorsTypeOpAttr('Tparams', x.dtype),
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createTensorsTypeOpAttr('Tindices', indices.dtype),
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createTensorsTypeOpAttr('Taxis', 'int32')
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];
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const res = backend.executeSingleOutput(
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GatherV2, opAttrs, [x, indices, axisTensor]);
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axisTensor.dispose();
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return res;
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}
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};
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