/**
 * @Description  :
 * @Author       : chenht2022
 * @Date         : 2024-07-16 10:43:18
 * @Version      : 1.0.0
 * @LastEditors  : chenht2022
 * @LastEditTime : 2024-07-25 10:35:04
 * @Copyright (c) 2024 by KVCache.AI, All Rights Reserved.
 **/
#include "mlp.h"

MLP::MLP(MLPConfig config) {
    config_ = config;
    gate_proj_ = config_.gate_proj;
    up_proj_ = config_.up_proj;
    down_proj_ = config_.down_proj;

    std::vector<std::pair<void**, uint64_t>> mem_requests;
    mem_requests.push_back({(void**)&input_fp32_, sizeof(float) * config_.group_max_len * config_.hidden_size});
    mem_requests.push_back({(void**)&gate_input_, config_.group_max_len * config_.hidden_size * ggml_type_size(ggml_internal_get_type_traits(config_.gate_type).vec_dot_type) / ggml_blck_size(ggml_internal_get_type_traits(config_.gate_type).vec_dot_type)});
    mem_requests.push_back({(void**)&up_input_, config_.group_max_len * config_.hidden_size * ggml_type_size(ggml_internal_get_type_traits(config_.up_type).vec_dot_type) / ggml_blck_size(ggml_internal_get_type_traits(config_.up_type).vec_dot_type)});
    mem_requests.push_back({(void**)&gate_output_, sizeof(float) * config_.group_max_len * config_.intermediate_size});
    mem_requests.push_back({(void**)&up_output_, sizeof(float) * config_.group_max_len * config_.intermediate_size});
    mem_requests.push_back({(void**)&intermediate_fp32_, sizeof(float) * config_.group_max_len * config_.intermediate_size});
    mem_requests.push_back({(void**)&down_input_, config_.group_max_len * config_.intermediate_size * ggml_type_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type) / ggml_blck_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type)});
    mem_requests.push_back({(void**)&down_output_, sizeof(float) * config_.group_max_len * config_.hidden_size});
    shared_mem_buffer.alloc(this, mem_requests);
}

MLP::~MLP() {
    shared_mem_buffer.dealloc(this);
}

void MLP::warm_up(Backend* backend) {
    std::vector<float> input_fp32(config_.hidden_size);
    std::vector<uint8_t> input(config_.hidden_size * ggml_type_size(config_.hidden_type) / ggml_blck_size(config_.hidden_type));
    std::vector<uint8_t> output(config_.hidden_size * ggml_type_size(config_.hidden_type) / ggml_blck_size(config_.hidden_type));
    for (int i = 0; i < config_.hidden_size; i++) {
        input_fp32[i] = 0;
    }
    from_float(input_fp32.data(), input.data(), config_.hidden_size, config_.hidden_type);
    forward_many(1, input.data(), output.data(), backend);
}

static float act_fn(float x) {
    return x / (1.0f + expf(-x));
}

void MLP::forward_many(int qlen, const void* input, void* output, Backend* backend) {
    const void* gate_input_ptr;
    const void* up_input_ptr;
    if (config_.hidden_type == ggml_internal_get_type_traits(config_.gate_type).vec_dot_type && config_.hidden_type == ggml_internal_get_type_traits(config_.up_type).vec_dot_type) {
        gate_input_ptr = up_input_ptr = input;
    } else {
        to_float(input, input_fp32_, qlen * config_.hidden_size, config_.hidden_type);
        if (ggml_internal_get_type_traits(config_.gate_type).vec_dot_type == ggml_internal_get_type_traits(config_.up_type).vec_dot_type) {
            from_float(input_fp32_, gate_input_, qlen * config_.hidden_size, ggml_internal_get_type_traits(config_.gate_type).vec_dot_type);
            gate_input_ptr = up_input_ptr = gate_input_;
        } else {
            if (config_.hidden_type != ggml_internal_get_type_traits(config_.gate_type).vec_dot_type) {
                from_float(input_fp32_, gate_input_, qlen * config_.hidden_size, ggml_internal_get_type_traits(config_.gate_type).vec_dot_type);
                gate_input_ptr = gate_input_;
            } else {
                gate_input_ptr = input;
            }
            if (config_.hidden_type != ggml_internal_get_type_traits(config_.up_type).vec_dot_type) {
                from_float(input_fp32_, up_input_, qlen * config_.hidden_size, ggml_internal_get_type_traits(config_.up_type).vec_dot_type);
                up_input_ptr = up_input_;
            } else {
                up_input_ptr = input;
            }
        }
    }
    int nth = config_.intermediate_size / config_.stride;
    backend->do_work_stealing_job(nth, [&](int task_id) {
        int ith = task_id;
        void* gate_proj_ptr = gate_proj_ + ith * config_.stride * config_.hidden_size * ggml_type_size(config_.gate_type) / ggml_blck_size(config_.gate_type);
        float* gate_output_ptr = gate_output_ + ith * config_.stride;
        llamafile_sgemm(config_.stride, qlen, config_.hidden_size / ggml_blck_size(config_.gate_type), gate_proj_ptr, config_.hidden_size / ggml_blck_size(config_.gate_type), gate_input_ptr, config_.hidden_size / ggml_blck_size(config_.gate_type), gate_output_ptr, config_.intermediate_size, 0, 1, GGML_TASK_TYPE_COMPUTE, config_.gate_type, ggml_internal_get_type_traits(config_.gate_type).vec_dot_type, GGML_TYPE_F32, GGML_PREC_DEFAULT);
        void* up_proj_ptr = up_proj_ + ith * config_.stride * config_.hidden_size * ggml_type_size(config_.up_type) / ggml_blck_size(config_.up_type);
        float* up_output_ptr = up_output_ + ith * config_.stride;
        llamafile_sgemm(config_.stride, qlen, config_.hidden_size / ggml_blck_size(config_.up_type), up_proj_ptr, config_.hidden_size / ggml_blck_size(config_.up_type), up_input_ptr, config_.hidden_size / ggml_blck_size(config_.up_type), up_output_ptr, config_.intermediate_size, 0, 1, GGML_TASK_TYPE_COMPUTE, config_.up_type, ggml_internal_get_type_traits(config_.up_type).vec_dot_type, GGML_TYPE_F32, GGML_PREC_DEFAULT);
        for (int i = 0; i < qlen; i++) {
            for (int j = ith * config_.stride; j < (ith + 1) * config_.stride; j++) {
                intermediate_fp32_[i * config_.intermediate_size + j] = act_fn(gate_output_[i * config_.intermediate_size + j]) * up_output_[i * config_.intermediate_size + j];
            }
            if (config_.stride % ggml_blck_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type) == 0) {
                float* intermediate_fp32_ptr = intermediate_fp32_ + i * config_.intermediate_size + ith * config_.stride;
                void* down_input_ptr = down_input_ + i * config_.intermediate_size * ggml_type_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type) / ggml_blck_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type) + ith * config_.stride * ggml_type_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type) / ggml_blck_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type);
                from_float(intermediate_fp32_ptr, down_input_ptr, config_.stride, ggml_internal_get_type_traits(config_.down_type).vec_dot_type);
            }
        }
    });
    if (config_.stride % ggml_blck_size(ggml_internal_get_type_traits(config_.down_type).vec_dot_type) != 0) {
        from_float(intermediate_fp32_, down_input_, qlen * config_.intermediate_size, ggml_internal_get_type_traits(config_.down_type).vec_dot_type);
    }
    nth = config_.hidden_size / config_.stride;
    backend->do_work_stealing_job(nth, [&](int task_id) {
        int ith = task_id;
        void* down_proj_ptr = down_proj_ + ith * config_.stride * config_.intermediate_size * ggml_type_size(config_.down_type) / ggml_blck_size(config_.down_type);
        float* down_output_ptr = down_output_ + ith * config_.stride;
        llamafile_sgemm(config_.stride, qlen, config_.intermediate_size / ggml_blck_size(config_.down_type), down_proj_ptr, config_.intermediate_size / ggml_blck_size(config_.down_type), down_input_, config_.intermediate_size / ggml_blck_size(config_.down_type), down_output_ptr, config_.hidden_size, 0, 1, GGML_TASK_TYPE_COMPUTE, config_.down_type, ggml_internal_get_type_traits(config_.down_type).vec_dot_type, GGML_TYPE_F32, GGML_PREC_DEFAULT);
        if (config_.stride % ggml_blck_size(config_.hidden_type) == 0) {
            for (int i = 0; i < qlen; i++) {
                float* output_fp32_ptr = down_output_ + i * config_.hidden_size + ith * config_.stride;
                void* output_ptr = output + i * config_.hidden_size * ggml_type_size(config_.hidden_type) / ggml_blck_size(config_.hidden_type) + ith * config_.stride * ggml_type_size(config_.hidden_type) / ggml_blck_size(config_.hidden_type);
                from_float(output_fp32_ptr, output_ptr, config_.stride, config_.hidden_type);
            }
        }
    });
    if (config_.stride % ggml_blck_size(config_.hidden_type) != 0) {
        from_float(down_output_, output, qlen * config_.hidden_size, config_.hidden_type);
    }
}

void MLP::forward(int qlen, const void* input, void* output, Backend* backend) {
    if (qlen <= 0) {
        return;
    }
    int forward_len = std::min(qlen, config_.group_max_len);
    forward_many(forward_len, input, output, backend);
    forward(qlen - forward_len, input + forward_len * config_.hidden_size * ggml_type_size(config_.hidden_type) / ggml_blck_size(config_.hidden_type), output + forward_len * config_.hidden_size * ggml_type_size(config_.hidden_type) / ggml_blck_size(config_.hidden_type), backend);
}