BeamSearchLayer.h

/*
 * Copyright (c) 2019-2023, NVIDIA CORPORATION.  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.
 */

#pragma once

#include "src/fastertransformer/kernels/beam_search_topk_kernels.h"
#include "src/fastertransformer/layers/beam_search_layers/BaseBeamSearchLayer.h"
#include <float.h>

namespace fastertransformer {

template<typename T>
class BeamSearchLayer: public BaseBeamSearchLayer<T> {
private:
    // meta data
    using BaseBeamSearchLayer<T>::vocab_size_;
    using BaseBeamSearchLayer<T>::vocab_size_padded_;

    using BaseBeamSearchLayer<T>::topk_softmax_workspace_size_;
    using BaseBeamSearchLayer<T>::topk_softmax_workspace_;

    void allocateBuffer() override;
    void allocateBuffer(size_t batch_size, size_t beam_width) override;
    void invokeSoftMax(TensorMap* output_tensors, TensorMap* input_tensors) override;

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

    float* float_log_prob_buf_ = nullptr;

protected:
public:
    BeamSearchLayer(size_t           max_batch_size,
                    size_t           head_num,
                    size_t           size_per_head,
                    size_t           beam_width,
                    size_t           vocab_size,
                    size_t           vocab_size_padded,
                    int              end_id,
                    float            diversity_rate,
                    float            temperature,
                    float            len_penalty,
                    float            repetition_penalty,
                    cudaStream_t     stream,
                    cublasMMWrapper* cublas_wrapper,
                    IAllocator*      allocator,
                    bool             is_free_buffer_after_forward);

    BeamSearchLayer(BeamSearchLayer<T> const& beam_search_layer);

    ~BeamSearchLayer();
};

}  // namespace fastertransformer