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bark.cpp
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bark.cpp
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/*
Port of Suno's Bark to C/C++.
Author: Pierre-Antoine Bannier <[email protected]>
Note on tokenization
--------------------
Even if bark relies on GPT to generate semantic tokens, the tokenizer is based on
Bert's multilingual cased tokenizer. This uses the WordPiece algorithm to split raw text
into tokens.
This file contains an unofficial (Google has not released an official implementation of
WordPiece) implementation of WordPiece.
Source:
https://github.com/skeskinen/bert.cpp/blob/master/bert.cpp
*/
#include "bark.h"
#include "ggml.h"
#include "util.h"
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <fstream>
#include <map>
#include <random>
#include <regex>
#include <string>
bool gpt_model_load(const std::string& fname, gpt_model& model, bark_vocab& vocab, bool has_vocab) {
auto fin = std::ifstream(fname, std::ios::binary);
if (!fin) {
fprintf(stderr, "%s: failed to open '%s'\n", __func__, fname.c_str());
return false;
}
// verify magic
{
uint32_t magic;
fin.read((char *) &magic, sizeof(magic));
if (magic != GGML_FILE_MAGIC) {
fprintf(stderr, "%s: invalid model file '%s' (bad magic)\n", __func__, fname.c_str());
return false;
}
}
// load hparams
{
auto & hparams = model.hparams;
read_safe(fin, hparams.n_layer);
read_safe(fin, hparams.n_head);
read_safe(fin, hparams.n_embd);
read_safe(fin, hparams.block_size);
read_safe(fin, hparams.n_in_vocab);
read_safe(fin, hparams.n_out_vocab);
read_safe(fin, hparams.n_lm_heads);
read_safe(fin, hparams.n_wtes);
printf("%s: n_in_vocab = %d\n", __func__, hparams.n_in_vocab);
printf("%s: n_out_vocab = %d\n", __func__, hparams.n_out_vocab);
printf("%s: block_size = %d\n", __func__, hparams.block_size);
printf("%s: n_embd = %d\n", __func__, hparams.n_embd);
printf("%s: n_head = %d\n", __func__, hparams.n_head);
printf("%s: n_layer = %d\n", __func__, hparams.n_layer);
printf("%s: n_lm_heads = %d\n", __func__, hparams.n_lm_heads);
printf("%s: n_wtes = %d\n", __func__, hparams.n_wtes);
}
if (has_vocab) {
int32_t n_vocab;
read_safe(fin, n_vocab);
// 5 special tokens: [UNK, SEP, MASK, PAD, CLS]
if (n_vocab != model.hparams.n_in_vocab - model.hparams.n_out_vocab - 5) {
fprintf(stderr, "%s: wrong voculary size (%d != %d)\n", __func__, n_vocab, model.hparams.n_in_vocab);
return false;
}
std::string word;
std::vector<char> tmp;
tmp.reserve(128);
for (int i = 0; i < n_vocab; i++) {
uint32_t len;
read_safe(fin, len);
if (len > 0) {
tmp.resize(len);
fin.read(&tmp[0], tmp.size()); // read to buffer
word.assign(&tmp[0], tmp.size());
} else {
word = "";
}
vocab.token_to_id[word] = i;
vocab.id_to_token[i] = word;
}
}
// for the big tensors, we have the option to store the data in 16-bit floats or quantized
// in order to save memory and also to speed up the computation
// ggml_type wtype = ggml_ftype_to_ggml_type((ggml_ftype) (model.hparams.ftype));
// if (wtype == GGML_TYPE_COUNT) {
// fprintf(stderr, "%s: invalid model file '%s' (bad ftype value %d)\n",
// __func__, fname.c_str(), model.hparams.ftype);
// return false;
// }
ggml_type wtype = GGML_TYPE_F32;
auto & ctx = model.ctx;
size_t ctx_size = 0;
{
const auto & hparams = model.hparams;
const int n_embd = hparams.n_embd;
const int n_layer = hparams.n_layer;
const int block_size = hparams.block_size;
const int n_in_vocab = hparams.n_in_vocab;
const int n_out_vocab = hparams.n_out_vocab;
const int n_lm_heads = hparams.n_lm_heads;
const int n_wtes = hparams.n_wtes;
ctx_size += n_embd*ggml_type_sizef(GGML_TYPE_F32); // ln_f_g
ctx_size += n_embd*ggml_type_sizef(GGML_TYPE_F32); // ln_f_b
ctx_size += n_wtes*n_in_vocab*n_embd*ggml_type_sizef(wtype); // wte
ctx_size += block_size*n_embd*ggml_type_sizef(GGML_TYPE_F32); // wpe
ctx_size += n_lm_heads*n_out_vocab*n_embd*ggml_type_sizef(wtype); // lm_head
ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // ln_1_g
ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // ln_1_b
ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // ln_2_g
ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // ln_2_b
ctx_size += n_layer*(3*n_embd*n_embd*ggml_type_sizef(wtype)); // c_attn_attn_w
ctx_size += n_layer*( 3*n_embd*ggml_type_sizef(GGML_TYPE_F32)); // c_attn_attn_b
ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // c_attn_proj_w
ctx_size += n_layer*( n_embd*ggml_type_sizef(GGML_TYPE_F32)); // c_attn_proj_b
ctx_size += n_layer*(4*n_embd*n_embd*ggml_type_sizef(wtype)); // c_mlp_fc_w
ctx_size += n_layer*( 4*n_embd*ggml_type_sizef(GGML_TYPE_F32)); // c_mlp_fc_b
ctx_size += n_layer*(4*n_embd*n_embd*ggml_type_sizef(wtype)); // c_mlp_proj_w
ctx_size += n_layer*( n_embd*ggml_type_sizef(GGML_TYPE_F32)); // c_mlp_proj_b
ctx_size += block_size*n_layer*n_embd*ggml_type_sizef(GGML_TYPE_F32); // memory_k
ctx_size += block_size*n_layer*n_embd*ggml_type_sizef(GGML_TYPE_F32); // memory_v
ctx_size += (6 + 12*n_layer)*512; // object overhead
printf("%s: ggml tensor size = %d bytes\n", __func__, (int) sizeof(ggml_tensor));
printf("%s: ggml ctx size = %6.2f MB\n", __func__, ctx_size/(1024.0*1024.0));
}
// create the ggml context
{
struct ggml_init_params params = {
/*.mem_size =*/ ctx_size,
/*.mem_buffer =*/ NULL,
/*.no_alloc =*/ false,
};
model.ctx = ggml_init(params);
if (!model.ctx) {
fprintf(stderr, "%s: ggml_init() failed\n", __func__);
return false;
}
}
// prepare memory for the weights
{
const auto & hparams = model.hparams;
const int n_embd = hparams.n_embd;
const int n_layer = hparams.n_layer;
const int block_size = hparams.block_size;
const int n_in_vocab = hparams.n_in_vocab;
const int n_out_vocab = hparams.n_out_vocab;
const int n_lm_heads = hparams.n_lm_heads;
const int n_wtes = hparams.n_wtes;
model.layers.resize(n_layer);
model.lm_heads.resize(n_lm_heads);
model.wtes.resize(n_wtes);
model.ln_f_g = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
model.ln_f_b = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
model.wpe = ggml_new_tensor_2d(ctx, GGML_TYPE_F32, n_embd, block_size);
for (int i = 0; i < n_wtes; i++) {
model.wtes[i] = ggml_new_tensor_2d(ctx, wtype, n_embd, n_in_vocab);
model.tensors["model/wte/" + std::to_string(i)] = model.wtes[i];
}
for (int i = 0; i < n_lm_heads; i++) {
model.lm_heads[i] = ggml_new_tensor_2d(ctx, wtype, n_embd, n_out_vocab);
model.tensors["model/lm_head/" + std::to_string(i)] = model.lm_heads[i];
}
model.tensors["model/ln_f/g"] = model.ln_f_g;
model.tensors["model/ln_f/b"] = model.ln_f_b;
model.tensors["model/wpe"] = model.wpe;
for (int i = 0; i < n_layer; ++i) {
auto & layer = model.layers[i];
layer.ln_1_g = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
layer.ln_1_b = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
layer.ln_2_g = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
layer.ln_2_b = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
layer.c_attn_attn_w = ggml_new_tensor_2d(ctx, wtype, n_embd, 3*n_embd);
layer.c_attn_attn_b = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, 3*n_embd);
layer.c_attn_proj_w = ggml_new_tensor_2d(ctx, wtype, n_embd, n_embd);
layer.c_attn_proj_b = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
layer.c_mlp_fc_w = ggml_new_tensor_2d(ctx, wtype, n_embd, 4*n_embd);
layer.c_mlp_fc_b = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, 4*n_embd);
layer.c_mlp_proj_w = ggml_new_tensor_2d(ctx, wtype, 4*n_embd, n_embd);
layer.c_mlp_proj_b = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_embd);
// map by name
model.tensors["model/h" + std::to_string(i) + "/ln_1/g"] = layer.ln_1_g;
model.tensors["model/h" + std::to_string(i) + "/ln_1/b"] = layer.ln_1_b;
model.tensors["model/h" + std::to_string(i) + "/ln_2/g"] = layer.ln_2_g;
model.tensors["model/h" + std::to_string(i) + "/ln_2/b"] = layer.ln_2_b;
model.tensors["model/h" + std::to_string(i) + "/attn/c_attn/w"] = layer.c_attn_attn_w;
model.tensors["model/h" + std::to_string(i) + "/attn/c_attn/b"] = layer.c_attn_attn_b;
model.tensors["model/h" + std::to_string(i) + "/attn/c_proj/w"] = layer.c_attn_proj_w;
model.tensors["model/h" + std::to_string(i) + "/attn/c_proj/b"] = layer.c_attn_proj_b;
model.tensors["model/h" + std::to_string(i) + "/mlp/c_fc/w"] = layer.c_mlp_fc_w;
model.tensors["model/h" + std::to_string(i) + "/mlp/c_fc/b"] = layer.c_mlp_fc_b;
model.tensors["model/h" + std::to_string(i) + "/mlp/c_proj/w"] = layer.c_mlp_proj_w;
model.tensors["model/h" + std::to_string(i) + "/mlp/c_proj/b"] = layer.c_mlp_proj_b;
}
}
// key + value memory
{
const auto & hparams = model.hparams;
const int n_embd = hparams.n_embd;
const int n_layer = hparams.n_layer;
const int block_size = hparams.block_size;
const int n_mem = n_layer*block_size;
const int n_elements = n_embd*n_mem;
model.memory_k = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_elements);
model.memory_v = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, n_elements);
const size_t memory_size = ggml_nbytes(model.memory_k) + ggml_nbytes(model.memory_v);
printf("%s: memory size = %8.2f MB, n_mem = %d\n", __func__, memory_size/1024.0/1024.0, n_mem);
}
// load weights
{
size_t total_size = 0;
while(true) {
int32_t n_dims;
int32_t length;
int32_t ttype;
read_safe(fin, n_dims);
read_safe(fin, length);
read_safe(fin, ttype);
if (fin.eof()) {
break;
}
int32_t nelements = 1;
int32_t ne[2] = { 1, 1 };
for (int i = 0; i < n_dims; ++i) {
read_safe(fin, ne[i]);
nelements *= ne[i];
}
std::string name(length, 0);
fin.read(&name[0], length);
if (model.tensors.find(name.data()) == model.tensors.end()) {
fprintf(stderr, "%s: unknown tensor '%s' in model file\n", __func__, name.data());
return false;
}
auto tensor = model.tensors[name.data()];
if (ggml_nelements(tensor) != nelements) {
fprintf(stderr, "%s: tensor '%s' has wrong size in model file\n", __func__, name.data());
return false;
}
if (tensor->ne[0] != ne[0] || tensor->ne[1] != ne[1]) {
fprintf(stderr, "%s: tensor '%s' has wrong shape in model file: got [%d, %d], expected [%d, %d]\n",
__func__, name.data(), (int) tensor->ne[0], (int) tensor->ne[1], ne[0], ne[1]);
return false;
}
const size_t bpe = ggml_type_size(ggml_type(ttype));
if ((nelements*bpe)/ggml_blck_size(tensor->type) != ggml_nbytes(tensor)) {
fprintf(stderr, "%s: tensor '%s' has wrong size in model file: got %zu, expected %zu\n",
__func__, name.data(), ggml_nbytes(tensor), nelements*bpe);
return false;
}
fin.read(reinterpret_cast<char *>(tensor->data), ggml_nbytes(tensor));
// printf("%48s - [%5d, %5d], type = %6s, %6.2f MB\n", name.data(), ne[0], ne[1], "float", ggml_nbytes(tensor)/1024.0/1024.0);
total_size += ggml_nbytes(tensor);
}
printf("%s: model size = %8.2f MB\n", __func__, total_size/1024.0/1024.0);
model.memsize = total_size;
}
fin.close();
return true;
}
bool bark_model_load(std::string & dirname, bark_model & model) {
printf("%s: loading model from '%s'\n", __func__, dirname.c_str());
// text
{
printf("%s: reading bark text model\n", __func__);
const std::string fname = dirname + "/ggml_weights_text.bin";
if(!gpt_model_load(fname, model.text_model, model.vocab, true)) {
fprintf(stderr, "%s: invalid model file '%s' (bad text)\n", __func__, fname.c_str());
return false;
}
model.memsize += model.text_model.memsize;
}
// coarse
{
printf("\n%s: reading bark coarse model\n", __func__);
const std::string fname = dirname + "/ggml_weights_coarse.bin";
if(!gpt_model_load(fname, model.coarse_model, model.vocab, false)) {
fprintf(stderr, "%s: invalid model file '%s' (bad coarse)\n", __func__, fname.c_str());
return false;
}
model.memsize += model.coarse_model.memsize;
}
// fine
{
printf("\n%s: reading bark fine model\n", __func__);
const std::string fname = dirname + "/ggml_weights_fine.bin";
if(!gpt_model_load(fname, model.fine_model, model.vocab, false)) {
fprintf(stderr, "%s: invalid model file '%s' (bad fine)\n", __func__, fname.c_str());
return false;
}
model.memsize += model.fine_model.memsize;
}
// codec
{
printf("\n%s: reading bark codec model\n", __func__);
const std::string fname = dirname + "/ggml_weights_codec.bin";
if(!encodec_model_load(fname, model.codec_model)) {
fprintf(stderr, "%s: invalid model file '%s' (bad codec)\n", __func__, fname.c_str());
return false;
}
model.memsize += model.coarse_model.memsize;
}
printf("\n%s: total model size = %8.2f MB\n", __func__, model.memsize/1024.0/1024.0);
return true;
}
void bert_tokenize(
const bark_vocab& vocab,
const char * text,
int32_t * tokens,
int32_t * n_tokens,
int32_t n_max_tokens) {
std::string str = text;
std::vector<std::string> words;
// first split the text into words
{
str = strip_accents(text);
std::string pat = R"([[:punct:]]|[[:alpha:]]+|[[:digit:]]+)";
std::regex re(pat);
std::smatch m;
while (std::regex_search(str, m, re)) {
for (std::string x : m)
words.push_back(x);
str = m.suffix();
}
}
int32_t t = 0;
// find the longest tokens that form the words:
for (const auto &word : words)
{
if (word.size() == 0)
continue;
int i = 0;
int n = word.size();
auto *token_map = &vocab.token_to_id;
loop:
while (i < n)
{
if (t >= n_max_tokens - 1)
break;
int j = n;
while (j > i)
{
auto it = token_map->find(word.substr(i, j - i));
if (it != token_map->end())
{
tokens[t++] = it->second;
i = j;
token_map = &vocab.subword_token_to_id;
goto loop;
}
--j;
}
if (j == i)
{
fprintf(stderr, "%s: unknown token '%s'\n", __func__, word.substr(i, 1).data());
token_map = &vocab.subword_token_to_id;
++i;
}
}
}
*n_tokens = t;
}
bool gpt_eval(
const gpt_model & model,
const int n_threads,
const int n_past,
const bool merge_ctx,
const std::vector<bark_vocab::id> & embd_inp,
std::vector<float> & embd_w,
size_t & mem_per_token) {
int N = embd_inp.size();
const auto & hparams = model.hparams;
const int n_embd = hparams.n_embd;
const int n_layer = hparams.n_layer;
const int n_ctx = hparams.block_size;
const int n_head = hparams.n_head;
const int n_vocab = hparams.n_out_vocab;
static size_t buf_size = 256u*1024*1024;
static void * buf = malloc(buf_size);
if (mem_per_token > 0 && mem_per_token*N > buf_size) {
const size_t buf_size_new = 1.2*(mem_per_token*N); // add 20% to account for ggml object overhead
// reallocate
buf_size = buf_size_new;
buf = realloc(buf, buf_size);
if (buf == nullptr) {
fprintf(stderr, "%s: failed to allocate %zu bytes\n", __func__, buf_size);
return false;
}
}
struct ggml_init_params params = {
/*.mem_size =*/ buf_size,
/*.mem_buffer =*/ buf,
/*.no_alloc =*/ false,
};
struct ggml_context * ctx0 = ggml_init(params);
struct ggml_cgraph gf = {};
gf.n_threads = n_threads;
struct ggml_tensor * input = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, N);
memcpy(input->data, embd_inp.data(), N*ggml_element_size(input));
struct ggml_tensor * embd;
if (!merge_ctx) {
// usually only one token is in the sequence (since the context is saved in
// memory_k and memory_v)
embd = ggml_get_rows(ctx0, model.wtes[0], input);
} else {
// first step (context merging)
struct ggml_tensor * seq_embd = ggml_get_rows(ctx0, model.wtes[0], ggml_view_1d(ctx0, input, 256, 0));
struct ggml_tensor * ctx_embd = ggml_get_rows(ctx0, model.wtes[0], ggml_view_1d(ctx0, input, 256, 256*ggml_element_size(input)));
struct ggml_tensor * rem_embd = ggml_get_rows(ctx0, model.wtes[0], ggml_view_1d(ctx0, input, 1, 512*ggml_element_size(input)));
struct ggml_tensor * merged_embd = ggml_add(ctx0, seq_embd, ctx_embd);
embd = ggml_new_tensor_2d(ctx0, GGML_TYPE_F32, merged_embd->ne[0], merged_embd->ne[1]+rem_embd->ne[1]);
embd = ggml_set_1d(ctx0, embd, merged_embd, 0);
embd = ggml_set_1d(ctx0, embd, rem_embd, merged_embd->ne[0]*merged_embd->ne[1]*ggml_element_size(merged_embd));
N -= 256; // merge context, input size is reduced
}
struct ggml_tensor * position = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, N);
for (int i = 0; i < N; ++i) {
((int32_t *) position->data)[i] = n_past + i;
}
// wte + wpe
struct ggml_tensor * inpL = ggml_add(ctx0,
embd, ggml_get_rows(ctx0, model.wpe, position));
for (int il = 0; il < n_layer; ++il) {
struct ggml_tensor * cur;
// norm
{
// [ 768, N]
cur = ggml_norm(ctx0, inpL);
// cur = ln_1_g*cur + ln_1_b
// [ 768, N]
cur = ggml_add(ctx0,
ggml_mul(ctx0,
ggml_repeat(ctx0, model.layers[il].ln_1_g, cur),
cur),
ggml_repeat(ctx0, model.layers[il].ln_1_b, cur));
}
// attn
// [2304, 768] - model.layers[il].c_attn_attn_w
// [2304, 1] - model.layers[il].c_attn_attn_b
// [ 768, N] - cur (in)
// [2304, N] - cur (out)
//
// cur = attn_w*cur + attn_b
// [2304, N]
{
cur = ggml_mul_mat(ctx0,
model.layers[il].c_attn_attn_w,
cur);
cur = ggml_add(ctx0,
ggml_repeat(ctx0, model.layers[il].c_attn_attn_b, cur),
cur);
}
// self-attention
{
struct ggml_tensor * Qcur = ggml_view_2d(ctx0, cur, n_embd, N, cur->nb[1], 0*sizeof(float)*n_embd);
struct ggml_tensor * Kcur = ggml_view_2d(ctx0, cur, n_embd, N, cur->nb[1], 1*sizeof(float)*n_embd);
struct ggml_tensor * Vcur = ggml_view_2d(ctx0, cur, n_embd, N, cur->nb[1], 2*sizeof(float)*n_embd);
// store key and value to memory
if (N >= 1) {
struct ggml_tensor * k = ggml_view_1d(ctx0, model.memory_k, N*n_embd, (ggml_element_size(model.memory_k)*n_embd)*(il*n_ctx + n_past));
struct ggml_tensor * v = ggml_view_1d(ctx0, model.memory_v, N*n_embd, (ggml_element_size(model.memory_v)*n_embd)*(il*n_ctx + n_past));
ggml_build_forward_expand(&gf, ggml_cpy(ctx0, Kcur, k));
ggml_build_forward_expand(&gf, ggml_cpy(ctx0, Vcur, v));
}
// Q = Qcur.contiguous().view(n_embd/n_head, n_head, N).permute(0, 2, 1, 3)
// [64, N, 12]
struct ggml_tensor * Q =
ggml_permute(ctx0,
ggml_cpy(ctx0,
Qcur,
ggml_new_tensor_3d(ctx0, GGML_TYPE_F32, n_embd/n_head, n_head, N)),
0, 2, 1, 3);
// K = Kmem.view(n_embd/n_head, n_head, n_past + N).permute(0, 2, 1, 3)
// [64, n_past + N, 12]
struct ggml_tensor * K =
ggml_permute(ctx0,
ggml_reshape_3d(ctx0,
ggml_view_1d(ctx0, model.memory_k, (n_past + N)*n_embd, il*n_ctx*ggml_element_size(model.memory_k)*n_embd),
n_embd/n_head, n_head, n_past + N),
0, 2, 1, 3);
// GG: flash attention
//struct ggml_tensor * V =
// ggml_cpy(ctx0,
// ggml_permute(ctx0,
// ggml_reshape_3d(ctx0,
// ggml_view_1d(ctx0, model.memory_v, (n_past + N)*n_embd, il*n_ctx*ggml_element_size(model.memory_v)*n_embd),
// n_embd/n_head, n_head, n_past + N),
// 1, 2, 0, 3),
// ggml_new_tensor_3d(ctx0, GGML_TYPE_F32, n_past + N, n_embd/n_head, n_head));
//struct ggml_tensor * KQV = ggml_flash_attn(ctx0, Q, K, V, true);
// K * Q
// [n_past + N, N, 12]
struct ggml_tensor * KQ = ggml_mul_mat(ctx0, K, Q);
// KQ_scaled = KQ / sqrt(n_embd/n_head)
// [n_past + N, N, 12]
struct ggml_tensor * KQ_scaled =
ggml_scale_inplace(ctx0,
KQ,
ggml_new_f32(ctx0, 1.0f/sqrt(float(n_embd)/n_head))
);
// KQ_masked = mask_past(KQ_scaled)
// [n_past + N, N, 12]
struct ggml_tensor * KQ_masked = ggml_diag_mask_inf_inplace(ctx0, KQ_scaled, n_past);
// KQ = soft_max(KQ_masked)
// [n_past + N, N, 12]
struct ggml_tensor * KQ_soft_max = ggml_soft_max_inplace(ctx0, KQ_masked);
// V_trans = Vmem.view(n_embd/n_head, n_head, n_past + N).permute(1, 2, 0, 3).contiguous()
// [n_past + N, 64, 12]
struct ggml_tensor * V_trans =
ggml_cpy(ctx0,
ggml_permute(ctx0,
ggml_reshape_3d(ctx0,
ggml_view_1d(ctx0, model.memory_v, (n_past + N)*n_embd, il*n_ctx*ggml_element_size(model.memory_v)*n_embd),
n_embd/n_head, n_head, n_past + N),
1, 2, 0, 3),
ggml_new_tensor_3d(ctx0, model.memory_v->type, n_past + N, n_embd/n_head, n_head));
// KQV = transpose(V) * KQ_soft_max
// [64, N, 12]
struct ggml_tensor * KQV = ggml_mul_mat(ctx0, V_trans, KQ_soft_max);
// KQV_merged = KQV.permute(0, 2, 1, 3)
// [64, 12, N]
struct ggml_tensor * KQV_merged = ggml_permute(ctx0, KQV, 0, 2, 1, 3);
// cur = KQV_merged.contiguous().view(n_embd, N)
// [768, N]
cur = ggml_cpy(ctx0,
KQV_merged,
ggml_new_tensor_2d(ctx0, GGML_TYPE_F32, n_embd, N));
}
// projection
// [ 768, 768] - model.layers[il].c_attn_proj_w
// [ 768, 1] - model.layers[il].c_attn_proj_b
// [ 768, N] - cur (in)
// [ 768, N] - cur (out)
//
// cur = proj_w*cur + proj_b
// [768, N]
{
cur = ggml_mul_mat(ctx0,
model.layers[il].c_attn_proj_w,
cur);
cur = ggml_add(ctx0,
ggml_repeat(ctx0, model.layers[il].c_attn_proj_b, cur),
cur);
}
// add the input
cur = ggml_add(ctx0, cur, inpL);
struct ggml_tensor * inpFF = cur;
// feed-forward network
{
// norm
{
cur = ggml_norm(ctx0, inpFF);
// cur = ln_2_g*cur + ln_2_b
// [ 768, N]
cur = ggml_add(ctx0,
ggml_mul(ctx0,
ggml_repeat(ctx0, model.layers[il].ln_2_g, cur),
cur),
ggml_repeat(ctx0, model.layers[il].ln_2_b, cur));
}
// fully connected
// [3072, 768] - model.layers[il].c_mlp_fc_w
// [3072, 1] - model.layers[il].c_mlp_fc_b
// [ 768, N] - cur (in)
// [3072, N] - cur (out)
//
// cur = fc_w*cur + fc_b
// [3072, N]
cur = ggml_mul_mat(ctx0,
model.layers[il].c_mlp_fc_w,
cur);
cur = ggml_add(ctx0,
ggml_repeat(ctx0, model.layers[il].c_mlp_fc_b, cur),
cur);
// GELU activation
// [3072, N]
cur = ggml_gelu(ctx0, cur);
// projection
// [ 768, 3072] - model.layers[il].c_mlp_proj_w
// [ 768, 1] - model.layers[il].c_mlp_proj_b
// [3072, N] - cur (in)
// [ 768, N] - cur (out)
//
// cur = proj_w*cur + proj_b
// [768, N]
cur = ggml_mul_mat(ctx0,
model.layers[il].c_mlp_proj_w,
cur);
cur = ggml_add(ctx0,
ggml_repeat(ctx0, model.layers[il].c_mlp_proj_b, cur),
cur);
}
// input for next layer
inpL = ggml_add(ctx0, cur, inpFF);
}
// norm
{
// [ 768, N]
inpL = ggml_norm(ctx0, inpL);
// inpL = ln_f_g*inpL + ln_f_b
// [ 768, N]
inpL = ggml_add(ctx0,
ggml_mul(ctx0,
ggml_repeat(ctx0, model.ln_f_g, inpL),
inpL),
ggml_repeat(ctx0, model.ln_f_b, inpL));
}
// inpL = WTE * inpL
// [ 768, 50257] - model.lm_head
// [ 768, N] - inpL
inpL = ggml_mul_mat(ctx0, model.lm_heads[0], inpL);
// logits -> probs
//inpL = ggml_soft_max_inplace(ctx0, inpL);
// run the computation
ggml_build_forward_expand(&gf, inpL);
ggml_graph_compute (ctx0, &gf);
// return result just for the last token
embd_w.resize(n_vocab);
memcpy(embd_w.data(), (float *) ggml_get_data(inpL) + (n_vocab*(N-1)), sizeof(float)*n_vocab);
if (mem_per_token == 0) {
mem_per_token = ggml_used_mem(ctx0)/N;
}
//printf("used_mem = %zu\n", ggml_used_mem(ctx0));
ggml_free(ctx0);
return true;
}
bark_vocab::id gpt_sample(
const bark_vocab & vocab,
const std::vector<float>& logits,
double temp,
std::mt19937 & rng,
float * eos_p) {
int n_logits = logits.size();
std::vector<std::pair<double, bark_vocab::id>> logits_id;
logits_id.reserve(n_logits);
{
const double scale = 1.0/temp;
for (int i = 0; i < n_logits; ++i) {
logits_id.push_back(std::make_pair(logits[i]*scale, i));
}
}
double maxl = -INFINITY;
for (const auto & kv : logits_id) {
maxl = std::max(maxl, kv.first);
}
// compute probs for the top K tokens
std::vector<double> probs;
probs.reserve(logits_id.size());
double sum = 0.0;
for (const auto & kv : logits_id) {
double p = exp(kv.first - maxl);
probs.push_back(p);
sum += p;
}
// normalize the probs
for (auto & p : probs) {
p /= sum;
}
std::discrete_distribution<> dist(probs.begin(), probs.end());
int idx = dist(rng);
// likelihood of EOS token
if (eos_p)
*eos_p = probs.back();
return logits_id[idx].second;
}
bool bark_generate_audio(
bark_model model,
const bark_vocab& vocab,
const char * text,
const int n_predict,
const int n_threads) {
std::vector<bark_vocab::id> tokens;
// TODO move into params
const int top_k = 10;
const int seed = 0;
const float top_p = 0.2;
const float temp = 0.7;
const int early_stop = true;
const int sliding_window_size = 60;
const int max_coarse_history = 630;
// in the original implementation, min_eos_p=0.2, yet for bark.cpp this seems too
// high and this generates overly long sequence.
const float min_eos_p = 0.15;
std::mt19937 rng(seed);
// tokenize text (bert tokenizer)
{
// max bark length: 256
int32_t max_ctx_size = std::min(model.text_model.hparams.block_size, 256);
int32_t n_tokens;
tokens.resize(max_ctx_size);
bert_tokenize(vocab, text, tokens.data(), &n_tokens, max_ctx_size);
for (int i = 0; i < tokens.size(); i++)
tokens[i] += TEXT_ENCODING_OFFSET;
if (n_tokens < max_ctx_size) {
for (int i = n_tokens; i < max_ctx_size; i++)
tokens[i] = TEXT_PAD_TOKEN;
} else if (n_tokens > max_ctx_size) {
fprintf(stderr, "%s: input sequence is too long (%d > 256), truncating sequence", __func__, n_tokens);
}
tokens.resize(max_ctx_size);
// semantic history
for (int i = 0; i < 256; i++)
tokens.push_back(SEMANTIC_PAD_TOKEN);
tokens.push_back(SEMANTIC_INFER_TOKEN);
assert(tokens.size() == 256 + 256 + 1);
}
printf("%s: prompt: '%s'\n", __func__, text);
printf("%s: number of tokens in prompt = %zu, first 8 tokens: ", __func__, tokens.size());
for (int i = 0; i < std::min(8, (int) tokens.size()); i++) {
printf("%d ", tokens[i]);
}
printf("\n\n");
// encode text (text model)
std::vector<bark_vocab::id> inp_semantic;
{
int n_past = 0;
float eos_p = 0;
std::vector<bark_vocab::id> input = tokens;
std::vector<float> logits;
// dry run to estimate mem_per_token
size_t mem_per_token = 0;
gpt_eval(model.text_model, n_threads, 0, false, { 0, 1, 2, 3 }, logits, mem_per_token);
for (int i = 0; i < 768; i++) {
const bool merge_ctx = i == 0;
gpt_eval(model.text_model, n_threads, n_past, merge_ctx, input, logits, mem_per_token);
float logits_pad_token = logits[SEMANTIC_PAD_TOKEN];
logits.resize(SEMANTIC_VOCAB_SIZE);
if (early_stop)
logits.push_back(logits[logits_pad_token]);
if (i == 0)
n_past += input.size() - 256; // first step, context are merged
else
n_past += input.size();
input.clear();
bark_vocab::id sampled_id = gpt_sample(vocab, logits, temp, rng, &eos_p);
input.push_back(sampled_id);
inp_semantic.push_back(sampled_id);
printf("%d ", sampled_id);
fflush(stdout);
if (early_stop && ((sampled_id == SEMANTIC_VOCAB_SIZE) || (eos_p > min_eos_p)))
break;
}
printf("\n\nsemantic sequence length: %d\n\n", inp_semantic.size());
}
// coarse encoding (coarse model)
std::vector<bark_vocab::id> input_coarse;
{
float semantic_to_coarse_ratio = COARSE_RATE_HZ / SEMANTIC_RATE_HZ * N_COARSE_CODEBOOKS;
int max_semantic_history = floorf(max_coarse_history / semantic_to_coarse_ratio);
int n_steps = floorf(inp_semantic.size() * semantic_to_coarse_ratio / N_COARSE_CODEBOOKS) * N_COARSE_CODEBOOKS;
int step_ix = 0;
BARK_ASSERT(n_steps > 0);
BARK_ASSERT(n_steps % N_COARSE_CODEBOOKS == 0);
int n_window_steps = ceilf(static_cast<float>(n_steps) / sliding_window_size);
std::vector<bark_vocab::id> input = inp_semantic;
std::vector<float> logits;
// dry run to estimate mem_per_token
size_t mem_per_token = 0;
gpt_eval(model.coarse_model, n_threads, 0, false, { 0, 1, 2, 3}, logits, mem_per_token);
for(int i = 0; i < n_window_steps; i++) {
int semantic_ix = roundf(n_steps / semantic_to_coarse_ratio);
std::vector<bark_vocab::id> input_in(input.begin() + std::max(semantic_ix-max_semantic_history, 0), input.end());
size_t original_size = input_in.size();
input_in.resize(256);
// padding from the right side
for (int ix = original_size; ix < 256; ix++)
input_in[ix] = COARSE_SEMANTIC_PAD_TOKEN;
input_in.push_back(COARSE_INFER_TOKEN);
// concatenate input_in and input_coarse
input_in.insert(
input_in.end(),
std::make_move_iterator(input_coarse.end() - std::min(max_coarse_history, (int) input_coarse.size())),
std::make_move_iterator(input_coarse.end())
);
int n_past = 0;
mem_per_token *= 1.1; // context length is growing, mem_per_token must grow as well
for(int j = 0; j < sliding_window_size; j++) {
if (step_ix >= n_steps)
continue;
gpt_eval(model.coarse_model, n_threads, n_past, false, input_in, logits, mem_per_token);
n_past += input_in.size();
input_in.clear();
bool is_major = step_ix % N_COARSE_CODEBOOKS == 0;
int start_ix = SEMANTIC_VOCAB_SIZE + (1 - is_major) * CODEBOOK_SIZE;
int end_ix = SEMANTIC_VOCAB_SIZE + (2 - is_major) * CODEBOOK_SIZE;
std::vector<float> relevant_logits(logits.begin() + start_ix, logits.begin() + end_ix);
bark_vocab::id sampled_id = gpt_sample(vocab, relevant_logits, temp, rng, NULL);
sampled_id += start_ix;
input_in.push_back(sampled_id);
input_coarse.push_back(sampled_id);