/**
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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 {KernelConfig, Multinomial, MultinomialAttrs, MultinomialInputs, scalar} from '@tensorflow/tfjs';
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import {createTensorsTypeOpAttr, NodeJSKernelBackend} from '../nodejs_kernel_backend';
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export const multinomialConfig: KernelConfig = {
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kernelName: Multinomial,
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backendName: 'tensorflow',
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kernelFunc: (args) => {
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const {logits} = args.inputs as MultinomialInputs;
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const backend = args.backend as NodeJSKernelBackend;
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const {numSamples, seed, normalized} =
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args.attrs as unknown as MultinomialAttrs;
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if (normalized) {
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throw new Error(
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'TF Node backend does not support normalized logits ' +
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'passed to multinomial');
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}
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const opAttrs = [
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createTensorsTypeOpAttr('T', logits.dtype),
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createTensorsTypeOpAttr('output_dtype', 'int32'),
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{name: 'seed', type: backend.binding.TF_ATTR_INT, value: seed},
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{name: 'seed2', type: backend.binding.TF_ATTR_INT, value: seed * seed},
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];
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const numSamplesTensor = scalar(numSamples, 'int32');
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const res = backend.executeSingleOutput(
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Multinomial, opAttrs, [logits, numSamplesTensor]);
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numSamplesTensor.dispose();
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return res;
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}
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};
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