ggml_extend.hpp

#ifndef __GGML_EXTEND_HPP__
#define __GGML_EXTEND_HPP__

#include <assert.h>
#include <inttypes.h>
#include <stdarg.h>
#include <algorithm>
#include <cstring>
#include <fstream>
#include <functional>
#include <iostream>
#include <iterator>
#include <map>
#include <memory>
#include <random>
#include <regex>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <vector>

#include "ggml/ggml-alloc.h"
#include "ggml/ggml-backend.h"
#include "ggml/ggml.h"

#ifdef SD_USE_CUBLAS
#include "ggml-cuda.h"
#endif

#ifdef SD_USE_METAL
#include "ggml-metal.h"
#endif

#include "rng.hpp"
#include "util.h"

#define EPS 1e-05f

#ifndef __STATIC_INLINE__
#define __STATIC_INLINE__ static inline
#endif

__STATIC_INLINE__ void ggml_log_callback_default(ggml_log_level level, const char* text, void* user_data) {
    (void)level;
    (void)user_data;
    fputs(text, stderr);
    fflush(stderr);
}

__STATIC_INLINE__ void ggml_tensor_set_f32_randn(struct ggml_tensor* tensor, std::shared_ptr<RNG> rng) {
    uint32_t n                        = (uint32_t)ggml_nelements(tensor);
    std::vector<float> random_numbers = rng->randn(n);
    for (uint32_t i = 0; i < n; i++) {
        ggml_set_f32_1d(tensor, i, random_numbers[i]);
    }
}

// set tensor[i, j, k, l]
// set tensor[l]
// set tensor[k, l]
// set tensor[j, k, l]
__STATIC_INLINE__ void ggml_tensor_set_f32(struct ggml_tensor* tensor, float value, int l, int k = 0, int j = 0, int i = 0) {
    GGML_ASSERT(tensor->nb[0] == sizeof(float));
    *(float*)((char*)(tensor->data) + i * tensor->nb[3] + j * tensor->nb[2] + k * tensor->nb[1] + l * tensor->nb[0]) = value;
}

__STATIC_INLINE__ float ggml_tensor_get_f32(const ggml_tensor* tensor, int l, int k = 0, int j = 0, int i = 0) {
    if (tensor->buffer != NULL) {
        float value;
        ggml_backend_tensor_get(tensor, &value, i * tensor->nb[3] + j * tensor->nb[2] + k * tensor->nb[1] + l * tensor->nb[0], sizeof(float));
        return value;
    }
    GGML_ASSERT(tensor->nb[0] == sizeof(float));
    return *(float*)((char*)(tensor->data) + i * tensor->nb[3] + j * tensor->nb[2] + k * tensor->nb[1] + l * tensor->nb[0]);
}

__STATIC_INLINE__ ggml_fp16_t ggml_tensor_get_f16(const ggml_tensor* tensor, int l, int k = 0, int j = 0, int i = 0) {
    GGML_ASSERT(tensor->nb[0] == sizeof(ggml_fp16_t));
    return *(ggml_fp16_t*)((char*)(tensor->data) + i * tensor->nb[3] + j * tensor->nb[2] + k * tensor->nb[1] + l * tensor->nb[0]);
}

static struct ggml_tensor* get_tensor_from_graph(struct ggml_cgraph* gf, const char* name) {
    struct ggml_tensor* res = NULL;
    for (int i = 0; i < gf->n_nodes; i++) {
        // printf("%d, %s \n", i, gf->nodes[i]->name);
        if (strcmp(ggml_get_name(gf->nodes[i]), name) == 0) {
            res = gf->nodes[i];
            break;
        }
    }
    for (int i = 0; i < gf->n_leafs; i++) {
        // printf("%d, %s \n", i, gf->leafs[i]->name);
        if (strcmp(ggml_get_name(gf->leafs[i]), name) == 0) {
            res = gf->leafs[i];
            break;
        }
    }
    return res;
}

__STATIC_INLINE__ void print_ggml_tensor(struct ggml_tensor* tensor, bool shape_only = false, const char* mark = "") {
    printf("%s (%s): shape(%zu, %zu, %zu, %zu)\n", mark, ggml_type_name(tensor->type), tensor->ne[0], tensor->ne[1], tensor->ne[2], tensor->ne[3]);
    fflush(stdout);
    if (shape_only) {
        return;
    }
    int range = 3;
    for (int i = 0; i < tensor->ne[3]; i++) {
        if (i >= range && i + range < tensor->ne[3]) {
            continue;
        }
        for (int j = 0; j < tensor->ne[2]; j++) {
            if (j >= range && j + range < tensor->ne[2]) {
                continue;
            }
            for (int k = 0; k < tensor->ne[1]; k++) {
                if (k >= range && k + range < tensor->ne[1]) {
                    continue;
                }
                for (int l = 0; l < tensor->ne[0]; l++) {
                    if (l >= range && l + range < tensor->ne[0]) {
                        continue;
                    }
                    if (tensor->type == GGML_TYPE_F32) {
                        printf("  [%d, %d, %d, %d] = %f\n", i, j, k, l, ggml_tensor_get_f32(tensor, l, k, j, i));
                    } else if (tensor->type == GGML_TYPE_F16) {
                        printf("  [%d, %d, %d, %d] = %i\n", i, j, k, l, ggml_tensor_get_f16(tensor, l, k, j, i));
                    }
                    fflush(stdout);
                }
            }
        }
    }
}

__STATIC_INLINE__ ggml_tensor* load_tensor_from_file(ggml_context* ctx, const std::string& file_path) {
    std::ifstream file(file_path, std::ios::binary);
    if (!file.is_open()) {
        LOG_ERROR("failed to open '%s'", file_path.c_str());
        return NULL;
    }
    int32_t n_dims;
    int32_t length;
    int32_t ttype;

    file.read(reinterpret_cast<char*>(&n_dims), sizeof(n_dims));
    file.read(reinterpret_cast<char*>(&length), sizeof(length));
    file.read(reinterpret_cast<char*>(&ttype), sizeof(ttype));

    if (file.eof()) {
        LOG_ERROR("incomplete file '%s'", file_path.c_str());
        return NULL;
    }

    int32_t nelements = 1;
    int32_t ne[4]     = {1, 1, 1, 1};
    for (int i = 0; i < n_dims; ++i) {
        file.read(reinterpret_cast<char*>(&ne[i]), sizeof(ne[i]));
        nelements *= ne[i];
    }
    std::string name(length, 0);
    file.read(&name[0], length);
    ggml_tensor* tensor = ggml_new_tensor_4d(ctx, (ggml_type)ttype, ne[0], ne[1], ne[2], ne[3]);
    const size_t bpe    = ggml_type_size(ggml_type(ttype));
    file.read(reinterpret_cast<char*>(tensor->data), ggml_nbytes(tensor));
    return tensor;
}

// __STATIC_INLINE__ void save_tensor_to_file(const std::string& file_name, ggml_tensor* tensor, const std::string & name) {
//     std::string file_name_ = file_name + ".tensor";
//     std::string name_ = name;
//     std::ofstream file("./" + file_name_, std::ios::binary);
//     file.write(reinterpret_cast<char*>(&tensor->n_dims), sizeof(tensor->n_dims));
//     int len = (int)name_.size();
//     file.write(reinterpret_cast<char*>(&len), sizeof(len));
//     int ttype = (int)tensor->type;
//     file.write(reinterpret_cast<char*>(&ttype), sizeof(ttype));
//     for (int i = 0; i < tensor->n_dims; ++i) {
//         int ne_ = (int) tensor->ne[i];
//         file.write(reinterpret_cast<char*>(&ne_), sizeof(ne_));
//     }
//     file.write(&name_[0], len);
//     char* data = nullptr;
//     file.write((char*)tensor->data, ggml_nbytes(tensor));
//     file.close();
// }

__STATIC_INLINE__ void copy_ggml_tensor(struct ggml_tensor* dst, struct ggml_tensor* src) {
    if (dst->type == src->type) {
        dst->nb[0] = src->nb[0];
        dst->nb[1] = src->nb[1];
        dst->nb[2] = src->nb[2];
        dst->nb[3] = src->nb[3];

        memcpy(((char*)dst->data), ((char*)src->data), ggml_nbytes(dst));
        return;
    }
    struct ggml_init_params params;
    params.mem_size          = 10 * 1024 * 1024;  // for padding
    params.mem_buffer        = NULL;
    params.no_alloc          = false;
    struct ggml_context* ctx = ggml_init(params);
    if (!ctx) {
        LOG_ERROR("ggml_init() failed");
        return;
    }
    ggml_tensor* final = ggml_cpy(ctx, src, dst);

    struct ggml_cgraph* graph = ggml_new_graph(ctx);
    ggml_build_forward_expand(graph, final);
    ggml_graph_compute_with_ctx(ctx, graph, 1);
    ggml_free(ctx);
}

__STATIC_INLINE__ float sigmoid(float x) {
    return 1 / (1.0f + expf(-x));
}

// SPECIAL OPERATIONS WITH TENSORS

__STATIC_INLINE__ uint8_t* sd_tensor_to_image(struct ggml_tensor* input) {
    int64_t width    = input->ne[0];
    int64_t height   = input->ne[1];
    int64_t channels = input->ne[2];
    GGML_ASSERT(channels == 3 && input->type == GGML_TYPE_F32);
    uint8_t* image_data = (uint8_t*)malloc(width * height * channels);
    for (int iy = 0; iy < height; iy++) {
        for (int ix = 0; ix < width; ix++) {
            for (int k = 0; k < channels; k++) {
                float value                                               = ggml_tensor_get_f32(input, ix, iy, k);
                *(image_data + iy * width * channels + ix * channels + k) = (uint8_t)(value * 255.0f);
            }
        }
    }
    return image_data;
}

__STATIC_INLINE__ uint8_t* sd_tensor_to_mul_image(struct ggml_tensor* input, int idx) {
    int64_t width    = input->ne[0];
    int64_t height   = input->ne[1];
    int64_t channels = input->ne[2];
    GGML_ASSERT(channels == 3 && input->type == GGML_TYPE_F32);
    uint8_t* image_data = (uint8_t*)malloc(width * height * channels);
    for (int iy = 0; iy < height; iy++) {
        for (int ix = 0; ix < width; ix++) {
            for (int k = 0; k < channels; k++) {
                float value                                               = ggml_tensor_get_f32(input, ix, iy, k, idx);
                *(image_data + iy * width * channels + ix * channels + k) = (uint8_t)(value * 255.0f);
            }
        }
    }
    return image_data;
}

__STATIC_INLINE__ void sd_image_to_tensor(const uint8_t* image_data,
                                          struct ggml_tensor* output,
                                          bool scale = true) {
    int64_t width    = output->ne[0];
    int64_t height   = output->ne[1];
    int64_t channels = output->ne[2];
    GGML_ASSERT(channels == 3 && output->type == GGML_TYPE_F32);
    for (int iy = 0; iy < height; iy++) {
        for (int ix = 0; ix < width; ix++) {
            for (int k = 0; k < channels; k++) {
                float value = *(image_data + iy * width * channels + ix * channels + k);
                if (scale) {
                    value /= 255.f;
                }
                ggml_tensor_set_f32(output, value, ix, iy, k);
            }
        }
    }
}

__STATIC_INLINE__ void sd_mul_images_to_tensor(const uint8_t* image_data,
                                               struct ggml_tensor* output,
                                               int idx,
                                               float* mean = NULL,
                                               float* std  = NULL) {
    int64_t width    = output->ne[0];
    int64_t height   = output->ne[1];
    int64_t channels = output->ne[2];
    GGML_ASSERT(channels == 3 && output->type == GGML_TYPE_F32);
    for (int iy = 0; iy < height; iy++) {
        for (int ix = 0; ix < width; ix++) {
            for (int k = 0; k < channels; k++) {
                int value       = *(image_data + iy * width * channels + ix * channels + k);
                float pixel_val = value / 255.0f;
                if (mean != NULL && std != NULL)
                    pixel_val = (pixel_val - mean[k]) / std[k];
                ggml_tensor_set_f32(output, pixel_val, ix, iy, k, idx);
            }
        }
    }
}

__STATIC_INLINE__ void sd_image_f32_to_tensor(const float* image_data,
                                              struct ggml_tensor* output,
                                              bool scale = true) {
    int64_t width    = output->ne[0];
    int64_t height   = output->ne[1];
    int64_t channels = output->ne[2];
    GGML_ASSERT(channels == 3 && output->type == GGML_TYPE_F32);
    for (int iy = 0; iy < height; iy++) {
        for (int ix = 0; ix < width; ix++) {
            for (int k = 0; k < channels; k++) {
                int value = *(image_data + iy * width * channels + ix * channels + k);
                if (scale) {
                    value /= 255.f;
                }
                ggml_tensor_set_f32(output, value, ix, iy, k);
            }
        }
    }
}

__STATIC_INLINE__ void ggml_split_tensor_2d(struct ggml_tensor* input,
                                            struct ggml_tensor* output,
                                            int x,
                                            int y) {
    int64_t width    = output->ne[0];
    int64_t height   = output->ne[1];
    int64_t channels = output->ne[2];
    GGML_ASSERT(input->type == GGML_TYPE_F32 && output->type == GGML_TYPE_F32);
    for (int iy = 0; iy < height; iy++) {
        for (int ix = 0; ix < width; ix++) {
            for (int k = 0; k < channels; k++) {
                float value = ggml_tensor_get_f32(input, ix + x, iy + y, k);
                ggml_tensor_set_f32(output, value, ix, iy, k);
            }
        }
    }
}

__STATIC_INLINE__ void ggml_merge_tensor_2d(struct ggml_tensor* input,
                                            struct ggml_tensor* output,
                                            int x,
                                            int y,
                                            int overlap) {
    int64_t width    = input->ne[0];
    int64_t height   = input->ne[1];
    int64_t channels = input->ne[2];
    GGML_ASSERT(input->type == GGML_TYPE_F32 && output->type == GGML_TYPE_F32);
    for (int iy = 0; iy < height; iy++) {
        for (int ix = 0; ix < width; ix++) {
            for (int k = 0; k < channels; k++) {
                float new_value = ggml_tensor_get_f32(input, ix, iy, k);
                if (overlap > 0) {  // blend colors in overlapped area
                    float old_value = ggml_tensor_get_f32(output, x + ix, y + iy, k);
                    if (x > 0 && ix < overlap) {  // in overlapped horizontal
                        ggml_tensor_set_f32(output, old_value + (new_value - old_value) * (ix / (1.0f * overlap)), x + ix, y + iy, k);
                        continue;
                    }
                    if (y > 0 && iy < overlap) {  // in overlapped vertical
                        ggml_tensor_set_f32(output, old_value + (new_value - old_value) * (iy / (1.0f * overlap)), x + ix, y + iy, k);
                        continue;
                    }
                }
                ggml_tensor_set_f32(output, new_value, x + ix, y + iy, k);
            }
        }
    }
}

__STATIC_INLINE__ float ggml_tensor_mean(struct ggml_tensor* src) {
    float mean        = 0.0f;
    int64_t nelements = ggml_nelements(src);
    float* data       = (float*)src->data;
    for (int i = 0; i < nelements; i++) {
        mean += data[i] / nelements * 1.0f;
    }
    return mean;
}

// a = a+b
__STATIC_INLINE__ void ggml_tensor_add(struct ggml_tensor* a, struct ggml_tensor* b) {
    GGML_ASSERT(ggml_nelements(a) == ggml_nelements(b));
    int64_t nelements = ggml_nelements(a);
    float* vec_a      = (float*)a->data;
    float* vec_b      = (float*)b->data;
    for (int i = 0; i < nelements; i++) {
        vec_a[i] = vec_a[i] + vec_b[i];
    }
}

__STATIC_INLINE__ void ggml_tensor_scale(struct ggml_tensor* src, float scale) {
    int64_t nelements = ggml_nelements(src);
    float* data       = (float*)src->data;
    for (int i = 0; i < nelements; i++) {
        data[i] = data[i] * scale;
    }
}

__STATIC_INLINE__ void ggml_tensor_clamp(struct ggml_tensor* src, float min, float max) {
    int64_t nelements = ggml_nelements(src);
    float* data       = (float*)src->data;
    for (int i = 0; i < nelements; i++) {
        float val = data[i];
        data[i]   = val < min ? min : (val > max ? max : val);
    }
}

// convert values from [0, 1] to [-1, 1]
__STATIC_INLINE__ void ggml_tensor_scale_input(struct ggml_tensor* src) {
    int64_t nelements = ggml_nelements(src);
    float* data       = (float*)src->data;
    for (int i = 0; i < nelements; i++) {
        float val = data[i];
        data[i]   = val * 2.0f - 1.0f;
    }
}

// convert values from [-1, 1] to [0, 1]
__STATIC_INLINE__ void ggml_tensor_scale_output(struct ggml_tensor* src) {
    int64_t nelements = ggml_nelements(src);
    float* data       = (float*)src->data;
    for (int i = 0; i < nelements; i++) {
        float val = data[i];
        data[i]   = (val + 1.0f) * 0.5f;
    }
}

typedef std::function<void(ggml_tensor*, ggml_tensor*, bool)> on_tile_process;

// Tiling
__STATIC_INLINE__ void sd_tiling(ggml_tensor* input, ggml_tensor* output, const int scale, const int tile_size, const float tile_overlap_factor, on_tile_process on_processing) {
    int input_width   = (int)input->ne[0];
    int input_height  = (int)input->ne[1];
    int output_width  = (int)output->ne[0];
    int output_height = (int)output->ne[1];
    GGML_ASSERT(input_width % 2 == 0 && input_height % 2 == 0 && output_width % 2 == 0 && output_height % 2 == 0);  // should be multiple of 2

    int tile_overlap     = (int32_t)(tile_size * tile_overlap_factor);
    int non_tile_overlap = tile_size - tile_overlap;

    struct ggml_init_params params = {};
    params.mem_size += tile_size * tile_size * input->ne[2] * sizeof(float);                       // input chunk
    params.mem_size += (tile_size * scale) * (tile_size * scale) * output->ne[2] * sizeof(float);  // output chunk
    params.mem_size += 3 * ggml_tensor_overhead();
    params.mem_buffer = NULL;
    params.no_alloc   = false;

    LOG_DEBUG("tile work buffer size: %.2f MB", params.mem_size / 1024.f / 1024.f);

    // draft context
    struct ggml_context* tiles_ctx = ggml_init(params);
    if (!tiles_ctx) {
        LOG_ERROR("ggml_init() failed");
        return;
    }

    // tiling
    ggml_tensor* input_tile  = ggml_new_tensor_4d(tiles_ctx, GGML_TYPE_F32, tile_size, tile_size, input->ne[2], 1);
    ggml_tensor* output_tile = ggml_new_tensor_4d(tiles_ctx, GGML_TYPE_F32, tile_size * scale, tile_size * scale, output->ne[2], 1);
    on_processing(input_tile, NULL, true);
    int num_tiles = ceil((float)input_width / non_tile_overlap) * ceil((float)input_height / non_tile_overlap);
    LOG_INFO("processing %i tiles", num_tiles);
    pretty_progress(1, num_tiles, 0.0f);
    int tile_count = 1;
    bool last_y = false, last_x = false;
    float last_time = 0.0f;
    for (int y = 0; y < input_height && !last_y; y += non_tile_overlap) {
        if (y + tile_size >= input_height) {
            y      = input_height - tile_size;
            last_y = true;
        }
        for (int x = 0; x < input_width && !last_x; x += non_tile_overlap) {
            if (x + tile_size >= input_width) {
                x      = input_width - tile_size;
                last_x = true;
            }
            int64_t t1 = ggml_time_ms();
            ggml_split_tensor_2d(input, input_tile, x, y);
            on_processing(input_tile, output_tile, false);
            ggml_merge_tensor_2d(output_tile, output, x * scale, y * scale, tile_overlap * scale);
            int64_t t2 = ggml_time_ms();
            last_time  = (t2 - t1) / 1000.0f;
            pretty_progress(tile_count, num_tiles, last_time);
            tile_count++;
        }
        last_x = false;
    }
    if (tile_count < num_tiles) {
        pretty_progress(num_tiles, num_tiles, last_time);
    }
    ggml_free(tiles_ctx);
}

__STATIC_INLINE__ struct ggml_tensor* ggml_group_norm_32(struct ggml_context* ctx,
                                                         struct ggml_tensor* a) {
    return ggml_group_norm(ctx, a, 32);
}

__STATIC_INLINE__ struct ggml_tensor* ggml_nn_linear(struct ggml_context* ctx,
                                                     struct ggml_tensor* x,
                                                     struct ggml_tensor* w,
                                                     struct ggml_tensor* b) {
    x = ggml_mul_mat(ctx, w, x);
    if (b != NULL) {
        x = ggml_add(ctx, x, b);
    }
    return x;
}

// w: [OC，IC, KH, KW]
// x: [N, IC, IH, IW]
// b: [OC,]
// result: [N, OC, OH, OW]
__STATIC_INLINE__ struct ggml_tensor* ggml_nn_conv_2d(struct ggml_context* ctx,
                                                      struct ggml_tensor* x,
                                                      struct ggml_tensor* w,
                                                      struct ggml_tensor* b,
                                                      int s0 = 1,
                                                      int s1 = 1,
                                                      int p0 = 0,
                                                      int p1 = 0,
                                                      int d0 = 1,
                                                      int d1 = 1) {
    x = ggml_conv_2d(ctx, w, x, s0, s1, p0, p1, d0, d1);
    if (b != NULL) {
        b = ggml_reshape_4d(ctx, b, 1, 1, b->ne[0], 1);
        // b = ggml_repeat(ctx, b, x);
        x = ggml_add(ctx, x, b);
    }
    return x;
}

// w: [OC，IC, KD, 1 * 1]
// x: [N, IC, IH, IW]
// b: [OC,]
// result: [N, OC, OH, OW]
__STATIC_INLINE__ struct ggml_tensor* ggml_nn_conv_3d_nx1x1_bak(struct ggml_context* ctx,
                                                                struct ggml_tensor* x,
                                                                struct ggml_tensor* w,
                                                                struct ggml_tensor* b,
                                                                int s2 = 1,
                                                                int p2 = 1,
                                                                int d2 = 1) {
    GGML_ASSERT(w->ne[0] == 1);
    // timesteps = x.shape[0]
    // x = rearrange(x, "(b t) c h w -> b c t h w", t=timesteps)
    // x = conv3d(x)
    // return rearrange(x, "b c t h w -> (b t) c h w")
    int64_t T = x->ne[3];
    int64_t B = x->ne[3] / T;
    int64_t C = x->ne[2];
    int64_t H = x->ne[1];
    int64_t W = x->ne[0];

    x = ggml_reshape_4d(ctx, x, W * H, C, T, B);           // (b t) c h w -> b t c (h w)
    x = ggml_cont(ctx, ggml_permute(ctx, x, 0, 2, 1, 3));  // b t c (h w) -> b c t (h w)
    x = ggml_conv_2d(ctx, w, x, 1, s2, 0, p2, 1, d2);      // [B, OC, T, OH * OW]
    if (b != NULL) {
        b = ggml_reshape_4d(ctx, b, 1, 1, b->ne[0], 1);
        x = ggml_add(ctx, x, b);
    }
    x = ggml_cont(ctx, ggml_permute(ctx, x, 0, 2, 1, 3));  // b c t (h w) -> b t c (h w)
    x = ggml_reshape_4d(ctx, x, W, H, C, T * B);           // b t c (h w) -> (b t) c h w
    return x;                                              // [B*T, OC, OH, OW]
}

// w: [OC，IC, KD, 1 * 1]
// x: [N, IC, ID, IH*IW]
// b: [OC,]
// result: [N, OC, OD, OH*OW]
__STATIC_INLINE__ struct ggml_tensor* ggml_nn_conv_3d_nx1x1(struct ggml_context* ctx,
                                                            struct ggml_tensor* x,
                                                            struct ggml_tensor* w,
                                                            struct ggml_tensor* b,
                                                            int s2 = 1,
                                                            int p2 = 1,
                                                            int d2 = 1) {
    x = ggml_conv_2d(ctx, w, x, 1, s2, 0, p2, 1, d2);  // [N, OC, T, OH * OW]
    if (b != NULL) {
        b = ggml_reshape_4d(ctx, b, 1, 1, b->ne[0], 1);
        x = ggml_add(ctx, x, b);
    }
    return x;  // [N, OC, T, OH * OW]
}

// q: [N * n_head, n_token, d_head]
// k: [N * n_head, n_k, d_head]
// v: [N * n_head, d_head, n_k]
// return: [N * n_head, n_token, d_head]
__STATIC_INLINE__ struct ggml_tensor* ggml_nn_attention(struct ggml_context* ctx,
                                                        struct ggml_tensor* q,
                                                        struct ggml_tensor* k,
                                                        struct ggml_tensor* v,
                                                        bool mask = false) {
#if defined(SD_USE_FLASH_ATTENTION) && !defined(SD_USE_CUBLAS) && !defined(SD_USE_METAL)
    struct ggml_tensor* kqv = ggml_flash_attn(ctx, q, k, v, false);  // [N * n_head, n_token, d_head]
#else
    float d_head = (float)q->ne[0];

    struct ggml_tensor* kq = ggml_mul_mat(ctx, k, q);  // [N * n_head, n_token, n_k]
    kq                     = ggml_scale_inplace(ctx, kq, 1.0f / sqrt(d_head));
    if (mask) {
        kq = ggml_diag_mask_inf_inplace(ctx, kq, 0);
    }
    kq = ggml_soft_max_inplace(ctx, kq);

    struct ggml_tensor* kqv = ggml_mul_mat(ctx, v, kq);  // [N * n_head, n_token, d_head]
#endif
    return kqv;
}

__STATIC_INLINE__ struct ggml_tensor* ggml_nn_layer_norm(struct ggml_context* ctx,
                                                         struct ggml_tensor* x,
                                                         struct ggml_tensor* w,
                                                         struct ggml_tensor* b,
                                                         float eps = EPS) {
    x = ggml_norm(ctx, x, eps);
    if (w != NULL) {
        x = ggml_mul(ctx, x, w);
        if (b != NULL) {
            x = ggml_add(ctx, x, b);
        }
    }
    return x;
}

__STATIC_INLINE__ struct ggml_tensor* ggml_nn_group_norm(struct ggml_context* ctx,
                                                         struct ggml_tensor* x,
                                                         struct ggml_tensor* w,
                                                         struct ggml_tensor* b,
                                                         int num_groups = 32) {
    if (ggml_n_dims(x) >= 3 && w != NULL && b != NULL) {
        w = ggml_reshape_4d(ctx, w, 1, 1, w->ne[0], 1);
        b = ggml_reshape_4d(ctx, b, 1, 1, b->ne[0], 1);
    }

    x = ggml_group_norm(ctx, x, num_groups);
    if (w != NULL && b != NULL) {
        x = ggml_mul(ctx, x, w);
        // b = ggml_repeat(ctx, b, x);
        x = ggml_add(ctx, x, b);
    }
    return x;
}

__STATIC_INLINE__ void ggml_backend_tensor_get_and_sync(ggml_backend_t backend, const struct ggml_tensor* tensor, void* data, size_t offset, size_t size) {
#ifdef SD_USE_CUBLAS
    if (!ggml_backend_is_cpu(backend)) {
        ggml_backend_tensor_get_async(backend, tensor, data, offset, size);
        ggml_backend_synchronize(backend);
    } else {
        ggml_backend_tensor_get(tensor, data, offset, size);
    }
#else
    ggml_backend_tensor_get(tensor, data, offset, size);
#endif
}

__STATIC_INLINE__ float ggml_backend_tensor_get_f32(ggml_tensor* tensor) {
    GGML_ASSERT(tensor->type == GGML_TYPE_F32 || tensor->type == GGML_TYPE_F16);
    float value;
    if (tensor->type == GGML_TYPE_F32) {
        ggml_backend_tensor_get(tensor, &value, 0, sizeof(value));
    } else {  // GGML_TYPE_F16
        ggml_fp16_t f16_value;
        ggml_backend_tensor_get(tensor, &f16_value, 0, sizeof(f16_value));
        value = ggml_fp16_to_fp32(f16_value);
    }
    return value;
}

__STATIC_INLINE__ struct ggml_tensor* vector_to_ggml_tensor(struct ggml_context* ctx,
                                                            const std::vector<float>& vec) {
    struct ggml_tensor* t = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, vec.size());
    memcpy(t->data, (const void*)vec.data(), ggml_nbytes(t));
    return t;
}

__STATIC_INLINE__ struct ggml_tensor* vector_to_ggml_tensor_i32(struct ggml_context* ctx,
                                                                const std::vector<int>& vec) {
    struct ggml_tensor* t = ggml_new_tensor_1d(ctx, GGML_TYPE_I32, vec.size());
    memcpy(t->data, (const void*)vec.data(), ggml_nbytes(t));
    return t;
}

__STATIC_INLINE__ std::vector<float> arange(float start, float end, float step = 1.f) {
    std::vector<float> result;

    for (float value = start; value < end; value += step) {
        result.push_back(value);
    }

    return result;
}

// Ref: https://github.com/CompVis/stable-diffusion/blob/main/ldm/modules/diffusionmodules/util.py#L151
__STATIC_INLINE__ std::vector<float> timestep_embedding(std::vector<float> timesteps,
                                                        int dim,
                                                        int max_period = 10000) {
    // timesteps: [N,]
    // embedding: [N, dim]
    size_t N        = timesteps.size();
    int acutual_dim = dim;
    if (dim % 2 != 0) {
        acutual_dim = dim + 1;
    }
    std::vector<float> embedding(N * acutual_dim, 0.f);
    int half = dim / 2;
    std::vector<float> freqs(half);
    for (int i = 0; i < half; ++i) {
        freqs[i] = (float)std::exp(-std::log(max_period) * i / half);
    }
    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < half; ++j) {
            float arg                             = timesteps[i] * freqs[j];
            embedding[i * acutual_dim + j]        = std::cos(arg);
            embedding[i * acutual_dim + j + half] = std::sin(arg);
        }
    }
    return embedding;
}

__STATIC_INLINE__ void set_timestep_embedding(std::vector<float> timesteps,
                                              struct ggml_tensor* embedding,
                                              int dim,
                                              int max_period = 10000) {
    std::vector<float> embedding_vec = timestep_embedding(timesteps, dim, max_period);
    memcpy(((char*)embedding->data), ((char*)embedding_vec.data()), ggml_nbytes(embedding));
}

__STATIC_INLINE__ struct ggml_tensor* new_timestep_embedding(struct ggml_context* ctx,
                                                             std::vector<float> timesteps,
                                                             int dim,
                                                             int max_period = 10000) {
    // timesteps: [N,]
    // embedding: [N, dim]
    std::vector<float> embedding_vec = timestep_embedding(timesteps, dim, max_period);
    int acutual_dim                  = dim;
    if (dim % 2 != 0) {
        acutual_dim = dim + 1;
    }
    struct ggml_tensor* embedding = ggml_new_tensor_2d(ctx, GGML_TYPE_F32, acutual_dim, timesteps.size());
    if (embedding->data != NULL) {
        memcpy(((char*)embedding->data), ((char*)embedding_vec.data()), ggml_nbytes(embedding));
    } else {
        ggml_backend_tensor_set(embedding, embedding_vec.data(), 0, ggml_nbytes(embedding));
    }
    return embedding;
}

__STATIC_INLINE__ struct ggml_tensor* ggml_nn_timestep_embedding(
    struct ggml_context* ctx,
    struct ggml_tensor* timesteps,
    int dim,
    int max_period = 10000) {
    return ggml_timestep_embedding(ctx, timesteps, dim, max_period);
}

__STATIC_INLINE__ size_t ggml_tensor_num(ggml_context* ctx) {
    size_t num = 0;
    for (ggml_tensor* t = ggml_get_first_tensor(ctx); t != nullptr; t = ggml_get_next_tensor(ctx, t)) {
        num++;
    }
    return num;
}

/* SDXL with LoRA requires more space */
#define MAX_PARAMS_TENSOR_NUM 15360
#define MAX_GRAPH_SIZE 15360

struct GGMLModule {
protected:
    typedef std::function<struct ggml_cgraph*()> get_graph_cb_t;

    struct ggml_context* params_ctx     = NULL;
    ggml_backend_buffer_t params_buffer = NULL;

    struct ggml_context* compute_ctx    = NULL;
    struct ggml_gallocr* compute_allocr = NULL;

    std::map<struct ggml_tensor*, const void*> backend_tensor_data_map;

    ggml_type wtype        = GGML_TYPE_F32;
    ggml_backend_t backend = NULL;

    void alloc_params_ctx() {
        struct ggml_init_params params;
        params.mem_size   = static_cast<size_t>(MAX_PARAMS_TENSOR_NUM * ggml_tensor_overhead());
        params.mem_buffer = NULL;
        params.no_alloc   = true;

        params_ctx = ggml_init(params);
        GGML_ASSERT(params_ctx != NULL);
    }

    void free_params_ctx() {
        if (params_ctx != NULL) {
            ggml_free(params_ctx);
            params_ctx = NULL;
        }
    }

    void alloc_compute_ctx() {
        struct ggml_init_params params;
        params.mem_size   = static_cast<size_t>(ggml_tensor_overhead() * MAX_GRAPH_SIZE + ggml_graph_overhead());
        params.mem_buffer = NULL;
        params.no_alloc   = true;

        compute_ctx = ggml_init(params);
        GGML_ASSERT(compute_ctx != NULL);
    }

    void free_compute_ctx() {
        if (compute_ctx != NULL) {
            ggml_free(compute_ctx);
            compute_ctx = NULL;
        }
    }

    bool alloc_compute_buffer(get_graph_cb_t get_graph) {
        if (compute_allocr != NULL) {
            return true;
        }
        reset_compute_ctx();
        struct ggml_cgraph* gf = get_graph();
        backend_tensor_data_map.clear();
        compute_allocr = ggml_gallocr_new(ggml_backend_get_default_buffer_type(backend));

        if (!ggml_gallocr_reserve(compute_allocr, gf)) {
            // failed to allocate the compute buffer
            LOG_ERROR("%s: failed to allocate the compute buffer\n", get_desc().c_str());
            free_compute_buffer();
            return false;
        }

        // compute the required memory
        size_t compute_buffer_size = ggml_gallocr_get_buffer_size(compute_allocr, 0);
        LOG_DEBUG("%s compute buffer size: %.2f MB(%s)",
                  get_desc().c_str(),
                  compute_buffer_size / 1024.0 / 1024.0,
                  ggml_backend_is_cpu(backend) ? "RAM" : "VRAM");
        return true;
    }

    void cpy_data_to_backend_tensor() {
        for (auto& kv : backend_tensor_data_map) {
            auto tensor = kv.first;
            auto data   = kv.second;

            ggml_backend_tensor_set(tensor, data, 0, ggml_nbytes(tensor));
        }

        backend_tensor_data_map.clear();
    }

public:
    virtual std::string get_desc() = 0;

    GGMLModule(ggml_backend_t backend, ggml_type wtype = GGML_TYPE_F32)
        : backend(backend), wtype(wtype) {
        alloc_params_ctx();
    }

    virtual ~GGMLModule() {
        free_params_buffer();
        free_compute_buffer();
        free_params_ctx();
        free_compute_ctx();
    }

    void reset_compute_ctx() {
        free_compute_ctx();
        alloc_compute_ctx();
    }

    bool alloc_params_buffer() {
        size_t num_tensors = ggml_tensor_num(params_ctx);
        params_buffer      = ggml_backend_alloc_ctx_tensors(params_ctx, backend);
        if (params_buffer == NULL) {
            LOG_ERROR("%s alloc params backend buffer failed", get_desc().c_str());
            return false;
        }
        size_t params_buffer_size = ggml_backend_buffer_get_size(params_buffer);
        LOG_DEBUG("%s params backend buffer size = % 6.2f MB(%s) (%i tensors)",
                  get_desc().c_str(),
                  params_buffer_size / (1024.0 * 1024.0),
                  ggml_backend_is_cpu(backend) ? "RAM" : "VRAM",
                  num_tensors);
        return true;
    }

    void free_params_buffer() {
        if (params_buffer != NULL) {
            ggml_backend_buffer_free(params_buffer);
            params_buffer = NULL;
        }
    }

    size_t get_params_buffer_size() {
        if (params_buffer != NULL) {
            return ggml_backend_buffer_get_size(params_buffer);
        }
        return 0;
    }

    void free_compute_buffer() {
        if (compute_allocr != NULL) {
            ggml_gallocr_free(compute_allocr);
            compute_allocr = NULL;
        }
    }

    // do copy after alloc graph
    void set_backend_tensor_data(struct ggml_tensor* tensor, const void* data) {
        backend_tensor_data_map[tensor] = data;
    }

    struct ggml_tensor* to_backend(struct ggml_tensor* tensor) {
        GGML_ASSERT(compute_ctx != NULL);
        if (tensor == NULL) {
            return NULL;
        }
        // it's performing a compute, check if backend isn't cpu
        if (!ggml_backend_is_cpu(backend) && (tensor->buffer == NULL || ggml_backend_buffer_is_host(tensor->buffer))) {
            // pass input tensors to gpu memory
            auto backend_tensor = ggml_dup_tensor(compute_ctx, tensor);

            set_backend_tensor_data(backend_tensor, tensor->data);
            return backend_tensor;
        } else {
            return tensor;
        }
    }

    void compute(get_graph_cb_t get_graph,
                 int n_threads,
                 bool free_compute_buffer_immediately = true,
                 struct ggml_tensor** output          = NULL,
                 struct ggml_context* output_ctx      = NULL) {
        alloc_compute_buffer(get_graph);
        reset_compute_ctx();
        struct ggml_cgraph* gf = get_graph();
        GGML_ASSERT(ggml_gallocr_alloc_graph(compute_allocr, gf));
        cpy_data_to_backend_tensor();
        if (ggml_backend_is_cpu(backend)) {
            ggml_backend_cpu_set_n_threads(backend, n_threads);
        }

#ifdef SD_USE_METAL
        if (ggml_backend_is_metal(backend)) {
            ggml_backend_metal_set_n_cb(backend, n_threads);
        }
#endif
        ggml_backend_graph_compute(backend, gf);

#ifdef GGML_PERF
        ggml_graph_print(gf);
#endif
        if (output != NULL) {
            auto result = gf->nodes[gf->n_nodes - 1];
            if (*output == NULL && output_ctx != NULL) {
                *output = ggml_dup_tensor(output_ctx, result);
            }
            if (*output != NULL) {
                ggml_backend_tensor_get_and_sync(backend, result, (*output)->data, 0, ggml_nbytes(*output));
            }
        }

        if (free_compute_buffer_immediately) {
            free_compute_buffer();
        }
    }
};

class GGMLBlock {
protected:
    typedef std::unordered_map<std::string, struct ggml_tensor*> ParameterMap;
    typedef std::unordered_map<std::string, std::shared_ptr<GGMLBlock>> GGMLBlockMap;
    GGMLBlockMap blocks;
    ParameterMap params;

    void init_blocks(struct ggml_context* ctx, ggml_type wtype) {
        for (auto& pair : blocks) {
            auto& block = pair.second;

            block->init(ctx, wtype);
        }
    }

    virtual void init_params(struct ggml_context* ctx, ggml_type wtype) {}

public:
    void init(struct ggml_context* ctx, ggml_type wtype) {
        init_blocks(ctx, wtype);
        init_params(ctx, wtype);
    }

    size_t get_params_num() {
        size_t num_tensors = params.size();
        for (auto& pair : blocks) {
            auto& block = pair.second;

            num_tensors += block->get_params_num();
        }
        return num_tensors;
    };

    size_t get_params_mem_size() {
        size_t mem_size = 0;
        for (auto& pair : blocks) {
            auto& block = pair.second;

            mem_size += block->get_params_mem_size();
        }

        for (auto& pair : params) {
            mem_size += ggml_nbytes(pair.second);
        }

        return mem_size;
    }

    void get_param_tensors(std::map<std::string, struct ggml_tensor*>& tensors, std::string prefix = "") {
        if (prefix.size() > 0) {
            prefix = prefix + ".";
        }
        for (auto& pair : blocks) {
            auto& block = pair.second;
            block->get_param_tensors(tensors, prefix + pair.first);
        }

        for (auto& pair : params) {
            struct ggml_tensor* param    = pair.second;
            tensors[prefix + pair.first] = pair.second;
        }
    }
};

class UnaryBlock : public GGMLBlock {
public:
    virtual struct ggml_tensor* forward(struct ggml_context* ctx, struct ggml_tensor* x) = 0;
};

class Linear : public UnaryBlock {
protected:
    int64_t in_features;
    int64_t out_features;
    bool bias;

    void init_params(struct ggml_context* ctx, ggml_type wtype) {
        params["weight"] = ggml_new_tensor_2d(ctx, wtype, in_features, out_features);
        if (bias) {
            params["bias"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, out_features);
        }
    }

public:
    Linear(int64_t in_features,
           int64_t out_features,
           bool bias = true)
        : in_features(in_features),
          out_features(out_features),
          bias(bias) {}

    struct ggml_tensor* forward(struct ggml_context* ctx, struct ggml_tensor* x) {
        struct ggml_tensor* w = params["weight"];
        struct ggml_tensor* b = NULL;
        if (bias) {
            b = params["bias"];
        }
        return ggml_nn_linear(ctx, x, w, b);
    }
};

class Conv2d : public UnaryBlock {
protected:
    int64_t in_channels;
    int64_t out_channels;
    std::pair<int, int> kernel_size;
    std::pair<int, int> stride;
    std::pair<int, int> padding;
    std::pair<int, int> dilation;
    bool bias;

    void init_params(struct ggml_context* ctx, ggml_type wtype) {
        params["weight"] = ggml_new_tensor_4d(ctx, GGML_TYPE_F16, kernel_size.second, kernel_size.first, in_channels, out_channels);
        if (bias) {
            params["bias"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, out_channels);
        }
    }

public:
    Conv2d(int64_t in_channels,
           int64_t out_channels,
           std::pair<int, int> kernel_size,
           std::pair<int, int> stride   = {1, 1},
           std::pair<int, int> padding  = {0, 0},
           std::pair<int, int> dilation = {1, 1},
           bool bias                    = true)
        : in_channels(in_channels),
          out_channels(out_channels),
          kernel_size(kernel_size),
          stride(stride),
          padding(padding),
          dilation(dilation),
          bias(bias) {}

    struct ggml_tensor* forward(struct ggml_context* ctx, struct ggml_tensor* x) {
        struct ggml_tensor* w = params["weight"];
        struct ggml_tensor* b = NULL;
        if (bias) {
            b = params["bias"];
        }
        return ggml_nn_conv_2d(ctx, x, w, b, stride.second, stride.first, padding.second, padding.first, dilation.second, dilation.first);
    }
};

class Conv3dnx1x1 : public UnaryBlock {
protected:
    int64_t in_channels;
    int64_t out_channels;
    int64_t kernel_size;
    int64_t stride;
    int64_t padding;
    int64_t dilation;
    bool bias;

    void init_params(struct ggml_context* ctx, ggml_type wtype) {
        params["weight"] = ggml_new_tensor_4d(ctx, GGML_TYPE_F16, 1, kernel_size, in_channels, out_channels);  // 5d => 4d
        if (bias) {
            params["bias"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, out_channels);
        }
    }

public:
    Conv3dnx1x1(int64_t in_channels,
                int64_t out_channels,
                int64_t kernel_size,
                int64_t stride   = 1,
                int64_t padding  = 0,
                int64_t dilation = 1,
                bool bias        = true)
        : in_channels(in_channels),
          out_channels(out_channels),
          kernel_size(kernel_size),
          stride(stride),
          padding(padding),
          dilation(dilation),
          bias(bias) {}

    // x: [N, IC, ID, IH*IW]
    // result: [N, OC, OD, OH*OW]
    struct ggml_tensor* forward(struct ggml_context* ctx, struct ggml_tensor* x) {
        struct ggml_tensor* w = params["weight"];
        struct ggml_tensor* b = NULL;
        if (bias) {
            b = params["bias"];
        }
        return ggml_nn_conv_3d_nx1x1(ctx, x, w, b, stride, padding, dilation);
    }
};

class LayerNorm : public UnaryBlock {
protected:
    int64_t normalized_shape;
    float eps;
    bool elementwise_affine;
    bool bias;

    void init_params(struct ggml_context* ctx, ggml_type wtype) {
        if (elementwise_affine) {
            params["weight"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, normalized_shape);
            if (bias) {
                params["bias"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, normalized_shape);
            }
        }
    }

public:
    LayerNorm(int64_t normalized_shape,
              float eps               = 1e-05f,
              bool elementwise_affine = true,
              bool bias               = true)
        : normalized_shape(normalized_shape),
          eps(eps),
          elementwise_affine(elementwise_affine),
          bias(bias) {}

    struct ggml_tensor* forward(struct ggml_context* ctx, struct ggml_tensor* x) {
        struct ggml_tensor* w = NULL;
        struct ggml_tensor* b = NULL;

        if (elementwise_affine) {
            w = params["weight"];
            if (bias) {
                b = params["bias"];
            }
        }
        return ggml_nn_layer_norm(ctx, x, w, b, eps);
    }
};

class GroupNorm : public GGMLBlock {
protected:
    int64_t num_groups;
    int64_t num_channels;
    float eps;
    bool affine;

    void init_params(struct ggml_context* ctx, ggml_type wtype) {
        if (affine) {
            params["weight"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, num_channels);
            params["bias"]   = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, num_channels);
        }
    }

public:
    GroupNorm(int64_t num_groups,
              int64_t num_channels,
              float eps   = 1e-05f,
              bool affine = true)
        : num_groups(num_groups),
          num_channels(num_channels),
          eps(eps),
          affine(affine) {}

    struct ggml_tensor* forward(struct ggml_context* ctx, struct ggml_tensor* x) {
        struct ggml_tensor* w = NULL;
        struct ggml_tensor* b = NULL;
        if (affine) {
            w = params["weight"];
            b = params["bias"];
        }
        return ggml_nn_group_norm(ctx, x, w, b, num_groups);
    }
};

class GroupNorm32 : public GroupNorm {
public:
    GroupNorm32(int64_t num_channels)
        : GroupNorm(32, num_channels, 1e-06f) {}
};

class MultiheadAttention : public GGMLBlock {
protected:
    int64_t embed_dim;
    int64_t n_head;
    bool bias;
    bool mask;

public:
    MultiheadAttention(int64_t embed_dim,
                       int64_t n_head,
                       bool bias = true)
        : embed_dim(embed_dim),
          n_head(n_head),
          bias(bias) {
        blocks["q_proj"]   = std::shared_ptr<GGMLBlock>(new Linear(embed_dim, embed_dim, bias));
        blocks["k_proj"]   = std::shared_ptr<GGMLBlock>(new Linear(embed_dim, embed_dim, bias));
        blocks["v_proj"]   = std::shared_ptr<GGMLBlock>(new Linear(embed_dim, embed_dim, bias));
        blocks["out_proj"] = std::shared_ptr<GGMLBlock>(new Linear(embed_dim, embed_dim, bias));
    }

    // x: [N, n_token, embed_dim]
    struct ggml_tensor* forward(struct ggml_context* ctx, struct ggml_tensor* x, bool mask = false) {
        auto q_proj   = std::dynamic_pointer_cast<Linear>(blocks["q_proj"]);
        auto k_proj   = std::dynamic_pointer_cast<Linear>(blocks["k_proj"]);
        auto v_proj   = std::dynamic_pointer_cast<Linear>(blocks["v_proj"]);
        auto out_proj = std::dynamic_pointer_cast<Linear>(blocks["out_proj"]);

        int64_t N       = x->ne[2];
        int64_t n_token = x->ne[1];
        int64_t d_head  = embed_dim / n_head;

        struct ggml_tensor* q = q_proj->forward(ctx, x);
        q                     = ggml_reshape_4d(ctx, q, d_head, n_head, n_token, N);   // [N, n_token, n_head, d_head]
        q                     = ggml_cont(ctx, ggml_permute(ctx, q, 0, 2, 1, 3));      // [N, n_head, n_token, d_head]
        q                     = ggml_reshape_3d(ctx, q, d_head, n_token, n_head * N);  // [N * n_head, n_token, d_head]

        struct ggml_tensor* k = k_proj->forward(ctx, x);
        k                     = ggml_reshape_4d(ctx, k, d_head, n_head, n_token, N);   // [N, n_token, n_head, d_head]
        k                     = ggml_cont(ctx, ggml_permute(ctx, k, 0, 2, 1, 3));      // [N, n_head, n_token, d_head]
        k                     = ggml_reshape_3d(ctx, k, d_head, n_token, n_head * N);  // [N * n_head, n_token, d_head]

        struct ggml_tensor* v = v_proj->forward(ctx, x);
        v                     = ggml_reshape_4d(ctx, v, d_head, n_head, n_token, N);   // [N, n_token, n_head, d_head]
        v                     = ggml_cont(ctx, ggml_permute(ctx, v, 1, 2, 0, 3));      // [N, n_head, d_head, n_token]
        v                     = ggml_reshape_3d(ctx, v, n_token, d_head, n_head * N);  // [N * n_head, d_head, n_token]

        struct ggml_tensor* kqv = ggml_nn_attention(ctx, q, k, v, mask);  // [N * n_head, n_token, d_head]

        kqv = ggml_reshape_4d(ctx, kqv, d_head, n_token, n_head, N);
        kqv = ggml_cont(ctx, ggml_permute(ctx, kqv, 0, 2, 1, 3));      // [N, n_token, n_head, d_head]
        x   = ggml_reshape_3d(ctx, kqv, d_head * n_head, n_token, N);  // [N, n_token, d_head * n_head]

        x = out_proj->forward(ctx, x);  // [N, n_token, embed_dim]
        return x;
    }
};

#endif  // __GGML_EXTEND__HPP__