/*
 * Copyright (c) 2019-2022, NVIDIA CORPORATION.  All rights reserved.
 * Copyright (c) 2021, NAVER Corp.  Authored by CLOVA.
 *
 * 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.
 */

#pragma once

#include "src/fastertransformer/layers/sampling_layers/BaseSamplingLayer.h"

namespace fastertransformer {

template<typename T>
class TopKTopPSamplingLayer: public BaseSamplingLayer<T> {
private:
    void runSampling(std::vector<fastertransformer::Tensor>* output_tensors,
                     const std::vector<fastertransformer::Tensor>* input_tensors) override;
    void runSampling(std::unordered_map<std::string, Tensor>* output_tensors,
                     const std::unordered_map<std::string, Tensor>* input_tensors) override;

    void allocateBuffer() override;
    void allocateBuffer(size_t batch_size, size_t top_k, float top_p) override;
    void freeBuffer() override;
    void invokeInitialize(size_t batch_size, unsigned long long random_seed, curandState_t* curandstate_buf) override;
    bool isValidTopK(size_t runtime_top_k);

    using BaseSamplingLayer<T>::vocab_size_;
    using BaseSamplingLayer<T>::vocab_size_padded_;

    using BaseSamplingLayer<T>::sampling_workspace_size_;
    using BaseSamplingLayer<T>::sampling_workspace_;
    using BaseSamplingLayer<T>::curandstate_buf_;

    using BaseSamplingLayer<T>::stream_;
    using BaseSamplingLayer<T>::allocator_;
    using BaseSamplingLayer<T>::is_allocate_buffer_;

protected:
public:
    TopKTopPSamplingLayer(size_t max_batch_size,
                          size_t vocab_size,
                          size_t vocab_size_padded,
                          int end_id,
                          int top_k,
                          float top_p,
                          unsigned long long random_seed,
                          float temperature,
                          float len_penalty,
                          float repetition_penalty,
                          cudaStream_t stream,
                          cublasMMWrapper* cublas_wrapper,
                          IAllocator* allocator,
                          bool is_free_buffer_after_forward);

    TopKTopPSamplingLayer(TopKTopPSamplingLayer<T> const& topk_topp_sampling_layer);

    ~TopKTopPSamplingLayer();
};

}  // namespace fastertransformer
