chromium/third_party/tflite/src/tensorflow/lite/kernels/multinomial.cc

/* Copyright 2020 The TensorFlow Authors. 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.
==============================================================================*/

#include <algorithm>
#include <cmath>
#include <cstdint>
#include <limits>
#include <random>

#include "tensorflow/lite/core/c/common.h"
#include "tensorflow/lite/kernels/internal/tensor_ctypes.h"
#include "tensorflow/lite/kernels/kernel_util.h"

namespace tflite {
namespace ops {
namespace custom {
namespace multinomial {

struct MultinomialParams { … };

// Draws a sample from a categorical distribution.
template <typename FloatType, typename IntegralType>
TfLiteStatus MultinomialSample(std::default_random_engine& rng,
                               const FloatType* logits, int logits_size,
                               IntegralType* outputs, int output_size) { … }

template <typename FloatType>
TfLiteStatus MultinomialSample(TfLiteContext* context,
                               std::default_random_engine& rng,
                               const FloatType* logits, int logits_size,
                               TfLiteTensor* output, int outputs_offset,
                               int output_size) { … }

TfLiteStatus MultinomialSample(TfLiteContext* context,
                               std::default_random_engine& rng,
                               const TfLiteTensor* logits, int logits_offset,
                               int logits_size, TfLiteTensor* output,
                               int outputs_offset, int output_size) { … }

void* Init(TfLiteContext* context, const char* buffer, size_t length) { … }

void Free(TfLiteContext* context, void* buffer) { … }

TfLiteStatus Prepare(TfLiteContext* context, TfLiteNode* node) { … }

TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) { … }

}  // namespace multinomial

TfLiteRegistration* Register_MULTINOMIAL() { … }

}  // namespace custom
}  // namespace ops
}  // namespace tflite