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added support for flux kontext

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Concedo 2025-06-28 11:37:19 +08:00
parent 0bd648ffa4
commit ed289227e5
6 changed files with 202 additions and 70 deletions
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83
otherarch/sdcpp/flux.hpp
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@ -672,11 +672,11 @@ namespace Flux {
}
// Generate IDs for image patches and text
std::vector<std::vector<float>> gen_ids(int h, int w, int patch_size, int bs, int context_len) {
std::vector<std::vector<float>> gen_ids(int h, int w, int patch_size, int index = 0) {
int h_len = (h + (patch_size / 2)) / patch_size;
int w_len = (w + (patch_size / 2)) / patch_size;
std::vector<std::vector<float>> img_ids(h_len * w_len, std::vector<float>(3, 0.0));
std::vector<std::vector<float>> img_ids(h_len * w_len, std::vector<float>(3, (float)index));
std::vector<float> row_ids = linspace(0, h_len - 1, h_len);
std::vector<float> col_ids = linspace(0, w_len - 1, w_len);
@ -688,10 +688,22 @@ namespace Flux {
}
}
std::vector<std::vector<float>> img_ids_repeated(bs * img_ids.size(), std::vector<float>(3));
for (int i = 0; i < bs; ++i) {
for (int j = 0; j < img_ids.size(); ++j) {
img_ids_repeated[i * img_ids.size() + j] = img_ids[j];
return img_ids;
}
// Generate positional embeddings
std::vector<float> gen_pe(std::vector<struct ggml_tensor*> imgs, struct ggml_tensor* context, int patch_size, int theta, const std::vector<int>& axes_dim) {
int context_len = context->ne[1];
int bs = imgs[0]->ne[3];
std::vector<std::vector<float>> img_ids;
for (int i = 0; i < imgs.size(); i++) {
auto x = imgs[i];
if (x) {
int h = x->ne[1];
int w = x->ne[0];
std::vector<std::vector<float>> img_ids_i = gen_ids(h, w, patch_size, i);
img_ids.insert(img_ids.end(), img_ids_i.begin(), img_ids_i.end());
}
}
@ -702,17 +714,10 @@ namespace Flux {
ids[i * (context_len + img_ids.size()) + j] = txt_ids[j];
}
for (int j = 0; j < img_ids.size(); ++j) {
ids[i * (context_len + img_ids.size()) + context_len + j] = img_ids_repeated[i * img_ids.size() + j];
ids[i * (context_len + img_ids.size()) + context_len + j] = img_ids[j];
}
}
return ids;
}
// Generate positional embeddings
std::vector<float> gen_pe(int h, int w, int patch_size, int bs, int context_len, int theta, const std::vector<int>& axes_dim) {
std::vector<std::vector<float>> ids = gen_ids(h, w, patch_size, bs, context_len);
std::vector<std::vector<float>> trans_ids = transpose(ids);
size_t pos_len = ids.size();
int num_axes = axes_dim.size();
@ -925,7 +930,7 @@ namespace Flux {
}
struct ggml_tensor* forward(struct ggml_context* ctx,
struct ggml_tensor* x,
std::vector<struct ggml_tensor*> imgs,
struct ggml_tensor* timestep,
struct ggml_tensor* context,
struct ggml_tensor* c_concat,
@ -933,7 +938,8 @@ namespace Flux {
struct ggml_tensor* guidance,
struct ggml_tensor* pe,
struct ggml_tensor* arange = NULL,
std::vector<int> skip_layers = std::vector<int>()) {
std::vector<int> skip_layers = std::vector<int>(),
SDVersion version = VERSION_FLUX) {
// Forward pass of DiT.
// x: (N, C, H, W) tensor of spatial inputs (images or latent representations of images)
// timestep: (N,) tensor of diffusion timesteps
@ -944,18 +950,31 @@ namespace Flux {
// pe: (L, d_head/2, 2, 2)
// return: (N, C, H, W)
auto x = imgs[0];
GGML_ASSERT(x->ne[3] == 1);
int64_t W = x->ne[0];
int64_t H = x->ne[1];
int64_t C = x->ne[2];
int64_t patch_size = 2;
int pad_h = (patch_size - H % patch_size) % patch_size;
int pad_w = (patch_size - W % patch_size) % patch_size;
x = ggml_pad(ctx, x, pad_w, pad_h, 0, 0); // [N, C, H + pad_h, W + pad_w]
int pad_h = (patch_size - x->ne[0] % patch_size) % patch_size;
int pad_w = (patch_size - x->ne[1] % patch_size) % patch_size;
// img = rearrange(x, "b c (h ph) (w pw) -> b (h w) (c ph pw)", ph=patch_size, pw=patch_size)
auto img = patchify(ctx, x, patch_size); // [N, h*w, C * patch_size * patch_size]
ggml_tensor* img = NULL; // [N, h*w, C * patch_size * patch_size]
int64_t patchified_img_size;
for (auto& x : imgs) {
int pad_h = (patch_size - x->ne[0] % patch_size) % patch_size;
int pad_w = (patch_size - x->ne[1] % patch_size) % patch_size;
ggml_tensor* pad_x = ggml_pad(ctx, x, pad_w, pad_h, 0, 0);
pad_x = patchify(ctx, pad_x, patch_size);
if (img) {
img = ggml_concat(ctx, img, pad_x, 1);
} else {
img = pad_x;
patchified_img_size = img->ne[1];
}
}
if (c_concat != NULL) {
ggml_tensor* masked = ggml_view_4d(ctx, c_concat, c_concat->ne[0], c_concat->ne[1], C, 1, c_concat->nb[1], c_concat->nb[2], c_concat->nb[3], 0);
@ -971,6 +990,7 @@ namespace Flux {
}
auto out = forward_orig(ctx, img, context, timestep, y, guidance, pe, arange, skip_layers); // [N, h*w, C * patch_size * patch_size]
out = ggml_cont(ctx, ggml_view_2d(ctx, out, out->ne[0], patchified_img_size, out->nb[1], 0));
// rearrange(out, "b (h w) (c ph pw) -> b c (h ph) (w pw)", h=h_len, w=w_len, ph=2, pw=2)
out = unpatchify(ctx, out, (H + pad_h) / patch_size, (W + pad_w) / patch_size, patch_size); // [N, C, H + pad_h, W + pad_w]
@ -1056,7 +1076,8 @@ namespace Flux {
struct ggml_tensor* c_concat,
struct ggml_tensor* y,
struct ggml_tensor* guidance,
std::vector<int> skip_layers = std::vector<int>()) {
std::vector<struct ggml_tensor*> kontext_imgs = std::vector<struct ggml_tensor*>(),
std::vector<int> skip_layers = std::vector<int>()) {
GGML_ASSERT(x->ne[3] == 1);
struct ggml_cgraph* gf = ggml_new_graph_custom(compute_ctx, FLUX_GRAPH_SIZE, false);
@ -1067,6 +1088,9 @@ namespace Flux {
if (c_concat != NULL) {
c_concat = to_backend(c_concat);
}
for (auto &img : kontext_imgs){
img = to_backend(img);
}
if (flux_params.is_chroma) {
const char* SD_CHROMA_ENABLE_GUIDANCE = getenv("SD_CHROMA_ENABLE_GUIDANCE");
bool disable_guidance = true;
@ -1107,8 +1131,10 @@ namespace Flux {
if (flux_params.guidance_embed || flux_params.is_chroma) {
guidance = to_backend(guidance);
}
auto imgs = kontext_imgs;
imgs.insert(imgs.begin(), x);
pe_vec = flux.gen_pe(x->ne[1], x->ne[0], 2, x->ne[3], context->ne[1], flux_params.theta, flux_params.axes_dim);
pe_vec = flux.gen_pe(imgs, context, 2, flux_params.theta, flux_params.axes_dim);
int pos_len = pe_vec.size() / flux_params.axes_dim_sum / 2;
// LOG_DEBUG("pos_len %d", pos_len);
auto pe = ggml_new_tensor_4d(compute_ctx, GGML_TYPE_F32, 2, 2, flux_params.axes_dim_sum / 2, pos_len);
@ -1118,7 +1144,7 @@ namespace Flux {
set_backend_tensor_data(pe, pe_vec.data());
struct ggml_tensor* out = flux.forward(compute_ctx,
x,
imgs,
timesteps,
context,
c_concat,
@ -1140,16 +1166,17 @@ namespace Flux {
struct ggml_tensor* c_concat,
struct ggml_tensor* y,
struct ggml_tensor* guidance,
struct ggml_tensor** output = NULL,
struct ggml_context* output_ctx = NULL,
std::vector<int> skip_layers = std::vector<int>()) {
std::vector<struct ggml_tensor*> kontext_imgs = std::vector<struct ggml_tensor*>(),
struct ggml_tensor** output = NULL,
struct ggml_context* output_ctx = NULL,
std::vector<int> skip_layers = std::vector<int>()) {
// x: [N, in_channels, h, w]
// timesteps: [N, ]
// context: [N, max_position, hidden_size]
// y: [N, adm_in_channels] or [1, adm_in_channels]
// guidance: [N, ]
auto get_graph = [&]() -> struct ggml_cgraph* {
return build_graph(x, timesteps, context, c_concat, y, guidance, skip_layers);
return build_graph(x, timesteps, context, c_concat, y, guidance, kontext_imgs, skip_layers);
};
GGMLRunner::compute(get_graph, n_threads, false, output, output_ctx);
@ -1189,7 +1216,7 @@ namespace Flux {
struct ggml_tensor* out = NULL;
int t0 = ggml_time_ms();
compute(8, x, timesteps, context, NULL, y, guidance, &out, work_ctx);
compute(8, x, timesteps, context, NULL, y, guidance, std::vector<struct ggml_tensor*>(), &out, work_ctx);
int t1 = ggml_time_ms();
print_ggml_tensor(out);