merged leejet/stable-diffusion.cpp#588 to fix vae tiling, ref #1603

LostRuins · LostRuins · commit 175c99081e88 · 2025-06-20T11:13:04.000+08:00
diff --git a/otherarch/sdcpp/ggml_extend.hpp b/otherarch/sdcpp/ggml_extend.hpp
@@ -470,7 +470,10 @@ __STATIC_INLINE__ void ggml_merge_tensor_2d(struct ggml_tensor* input,
                                             struct ggml_tensor* output,
                                             int x,
                                             int y,
-                                            int overlap) {
+                                            int overlap_x,
+                                            int overlap_y,
+                                            int x_skip = 0,
+                                            int y_skip = 0) {
     int64_t width    = input->ne[0];
     int64_t height   = input->ne[1];
     int64_t channels = input->ne[2];
@@ -479,17 +482,17 @@ __STATIC_INLINE__ void ggml_merge_tensor_2d(struct ggml_tensor* input,
     int64_t img_height = output->ne[1];
 
     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 iy = y_skip; iy < height; iy++) {
+        for (int ix = x_skip; 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
+                if (overlap_x > 0 || overlap_y > 0) {  // blend colors in overlapped area
                     float old_value = ggml_tensor_get_f32(output, x + ix, y + iy, k);
 
-                    const float x_f_0 = (x > 0) ? ix / float(overlap) : 1;
-                    const float x_f_1 = (x < (img_width - width)) ? (width - ix) / float(overlap) : 1;
-                    const float y_f_0 = (y > 0) ? iy / float(overlap) : 1;
-                    const float y_f_1 = (y < (img_height - height)) ? (height - iy) / float(overlap) : 1;
+                    const float x_f_0 = (overlap_x > 0 && x > 0) ? (ix - x_skip) / float(overlap_x) : 1;
+                    const float x_f_1 = (overlap_x > 0 && x < (img_width - width)) ? (width - ix) / float(overlap_x) : 1;
+                    const float y_f_0 = (overlap_y > 0 && y > 0) ? (iy - y_skip) / float(overlap_y) : 1;
+                    const float y_f_1 = (overlap_y > 0 && y < (img_height - height)) ? (height - iy) / float(overlap_y) : 1;
 
                     const float x_f = std::min(std::min(x_f_0, x_f_1), 1.f);
                     const float y_f = std::min(std::min(y_f_0, y_f_1), 1.f);
@@ -602,21 +605,96 @@ __STATIC_INLINE__ void ggml_tensor_scale_output(struct ggml_tensor* src) {
 
 typedef std::function<void(ggml_tensor*, ggml_tensor*, bool)> on_tile_process;
 
+__STATIC_INLINE__ void
+sd_tiling_calc_tiles(int &num_tiles_dim, float& tile_overlap_factor_dim, int small_dim, int tile_size, const float tile_overlap_factor) {
+
+    int tile_overlap     = (tile_size * tile_overlap_factor);
+    int non_tile_overlap = tile_size - tile_overlap;
+
+    num_tiles_dim = (small_dim - tile_overlap) / non_tile_overlap;
+    int overshoot_dim = ((num_tiles_dim + 1) * non_tile_overlap + tile_overlap) % small_dim;
+
+    if ((overshoot_dim != non_tile_overlap) && (overshoot_dim <= num_tiles_dim * (tile_size / 2 - tile_overlap))) {
+        // if tiles don't fit perfectly using the desired overlap
+        // and there is enough room to squeeze an extra tile without overlap becoming >0.5
+        num_tiles_dim++;
+    }
+
+    tile_overlap_factor_dim = (float)(tile_size * num_tiles_dim - small_dim) / (float)(tile_size * (num_tiles_dim - 1));
+    if (num_tiles_dim <= 2) {
+        if (small_dim <= tile_size) {
+            num_tiles_dim           = 1;
+            tile_overlap_factor_dim = 0;
+        } else {
+            num_tiles_dim           = 2;
+            tile_overlap_factor_dim = (2 * tile_size - small_dim) / (float)tile_size;
+        }
+    }
+}
+
 // 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) {
+__STATIC_INLINE__ void sd_tiling_non_square(ggml_tensor* input, ggml_tensor* output, const int scale,
+                                            const int p_tile_size_x, const int p_tile_size_y,
+                                            const float tile_overlap_factor, on_tile_process on_processing) {
+
     output = ggml_set_f32(output, 0);
+
     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 / output_width == input_height / output_height && output_width / input_width == output_height / input_height);
+    GGML_ASSERT(input_width / output_width == scale || output_width / input_width == scale);
+
+    int small_width  = output_width;
+    int small_height = output_height;
+
+    bool big_out = output_width > input_width;
+    if (big_out) {
+        // Ex: decode
+        small_width  = input_width;
+        small_height = input_height;
+    }
+
+    int num_tiles_x;
+    float tile_overlap_factor_x;
+    sd_tiling_calc_tiles(num_tiles_x, tile_overlap_factor_x, small_width, p_tile_size_x, tile_overlap_factor);
+
+    int num_tiles_y;
+    float tile_overlap_factor_y;
+    sd_tiling_calc_tiles(num_tiles_y, tile_overlap_factor_y, small_height, p_tile_size_y, tile_overlap_factor);
+
+    // LOG_DEBUG("num tiles : %d, %d ", num_tiles_x, num_tiles_y);
+    // LOG_DEBUG("optimal overlap : %f, %f (targeting %f)", tile_overlap_factor_x, tile_overlap_factor_y, tile_overlap_factor);
+
     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;
+    int tile_overlap_x     = (int32_t)(p_tile_size_x * tile_overlap_factor_x);
+    int non_tile_overlap_x = p_tile_size_x - tile_overlap_x;
+
+    int tile_overlap_y     = (int32_t)(p_tile_size_y * tile_overlap_factor_y);
+    int non_tile_overlap_y = p_tile_size_y - tile_overlap_y;
+
+    int tile_size_x = p_tile_size_x < small_width ? p_tile_size_x : small_width;
+    int tile_size_y = p_tile_size_y < small_height ? p_tile_size_y : small_height;
+
+    int input_tile_size_x  = tile_size_x;
+    int input_tile_size_y  = tile_size_y;
+    int output_tile_size_x = tile_size_x;
+    int output_tile_size_y = tile_size_y;
+
+    if (big_out) {
+        output_tile_size_x *= scale;
+        output_tile_size_y *= scale;
+    } else {
+        input_tile_size_x *= scale;
+        input_tile_size_y *= scale;
+    }
 
     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 += input_tile_size_x * input_tile_size_y * input->ne[2] * sizeof(float);     // input chunk
+    params.mem_size += output_tile_size_x * output_tile_size_y * output->ne[2] * sizeof(float);  // output chunk
     params.mem_size += 3 * ggml_tensor_overhead();
     params.mem_buffer = NULL;
     params.no_alloc   = false;
@@ -631,29 +709,50 @@ __STATIC_INLINE__ void sd_tiling(ggml_tensor* input, ggml_tensor* output, const
     }
 
     // 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);
+    ggml_tensor* input_tile  = ggml_new_tensor_4d(tiles_ctx, GGML_TYPE_F32, input_tile_size_x, input_tile_size_y, input->ne[2], 1);
+    ggml_tensor* output_tile = ggml_new_tensor_4d(tiles_ctx, GGML_TYPE_F32, output_tile_size_x, output_tile_size_y, output->ne[2], 1);
+    int num_tiles            = num_tiles_x * num_tiles_y;
     LOG_INFO("processing %i tiles", num_tiles);
-    pretty_progress(1, num_tiles, 0.0f);
+    pretty_progress(0, 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;
+    for (int y = 0; y < small_height && !last_y; y += non_tile_overlap_y) {
+        int dy = 0;
+        if (y + tile_size_y >= small_height) {
+            int _y = y;
+            y      = small_height - tile_size_y;
+            dy     = _y - y;
+            if (big_out) {
+                dy *= scale;
+            }
             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;
+        for (int x = 0; x < small_width && !last_x; x += non_tile_overlap_x) {
+            int dx = 0;
+            if (x + tile_size_x >= small_width) {
+                int _x = x;
+                x      = small_width - tile_size_x;
+                dx     = _x - x;
+                if (big_out) {
+                    dx *= scale;
+                }
                 last_x = true;
             }
+
+            int x_in  = big_out ? x : scale * x;
+            int y_in  = big_out ? y : scale * y;
+            int x_out = big_out ? x * scale : x;
+            int y_out = big_out ? y * scale : y;
+
+            int overlap_x_out = big_out ? tile_overlap_x * scale : tile_overlap_x;
+            int overlap_y_out = big_out ? tile_overlap_y * scale : tile_overlap_y;
+
             int64_t t1 = ggml_time_ms();
-            ggml_split_tensor_2d(input, input_tile, x, y);
+            ggml_split_tensor_2d(input, input_tile, x_in, y_in);
             on_processing(input_tile, output_tile, false);
-            ggml_merge_tensor_2d(output_tile, output, x * scale, y * scale, tile_overlap * scale);
+            ggml_merge_tensor_2d(output_tile, output, x_out, y_out, overlap_x_out, overlap_y_out, dx, dy);
+
             int64_t t2 = ggml_time_ms();
             last_time  = (t2 - t1) / 1000.0f;
             pretty_progress(tile_count, num_tiles, last_time);
@@ -667,6 +766,11 @@ __STATIC_INLINE__ void sd_tiling(ggml_tensor* input, ggml_tensor* output, const
     ggml_free(tiles_ctx);
 }
 
+__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) {
+    sd_tiling_non_square(input, output, scale, tile_size, tile_size, tile_overlap_factor, on_processing);
+}
+
 __STATIC_INLINE__ struct ggml_tensor* ggml_group_norm_32(struct ggml_context* ctx,
                                                          struct ggml_tensor* a) {
     const float eps = 1e-6f;  // default eps parameter
diff --git a/otherarch/sdcpp/stable-diffusion.cpp b/otherarch/sdcpp/stable-diffusion.cpp
@@ -1139,18 +1139,111 @@ class StableDiffusionGGML {
                                                  decode ? 3 : C,
                                                  x->ne[3]);  // channels
         int64_t t0          = ggml_time_ms();
+
+        // TODO: args instead of env for tile size / overlap?
+
+        float tile_overlap = 0.5f;
+        const char* SD_TILE_OVERLAP = getenv("SD_TILE_OVERLAP");
+        if (SD_TILE_OVERLAP != nullptr) {
+            std::string sd_tile_overlap_str = SD_TILE_OVERLAP;
+            try {
+                tile_overlap = std::stof(sd_tile_overlap_str);
+                if (tile_overlap < 0.0) {
+                    LOG_WARN("SD_TILE_OVERLAP too low, setting it to 0.0");
+                    tile_overlap = 0.0;
+                }
+                else if (tile_overlap > 0.5) {
+                    LOG_WARN("SD_TILE_OVERLAP too high, setting it to 0.5");
+                    tile_overlap = 0.5;
+                }
+            } catch (const std::invalid_argument&) {
+                LOG_WARN("SD_TILE_OVERLAP is invalid, keeping the default");
+            } catch (const std::out_of_range&) {
+                LOG_WARN("SD_TILE_OVERLAP is out of range, keeping the default");
+            }
+        }
+
+        int tile_size_x = 32;
+        int tile_size_y = 32;
+        const char* SD_TILE_SIZE = getenv("SD_TILE_SIZE");
+        if (SD_TILE_SIZE != nullptr) {
+            // format is AxB, or just A (equivalent to AxA)
+            // A and B can be integers (tile size) or floating point
+            // floating point <= 1 means simple fraction of the latent dimension
+            // floating point > 1 means number of tiles across that dimension
+            // a single number gets applied to both
+            auto get_tile_factor = [tile_overlap](const std::string& factor_str) {
+                float factor = std::stof(factor_str);
+                if (factor > 1.0)
+                    factor = 1 / (factor - factor * tile_overlap + tile_overlap);
+                return factor;
+            };
+            const int latent_x = W / (decode ? 1 : 8);
+            const int latent_y = H / (decode ? 1 : 8);
+            const int min_tile_dimension = 4;
+            std::string sd_tile_size_str = SD_TILE_SIZE;
+            size_t x_pos = sd_tile_size_str.find('x');
+            try {
+                int tmp_x = tile_size_x, tmp_y = tile_size_y;
+                if (x_pos != std::string::npos) {
+                    std::string tile_x_str = sd_tile_size_str.substr(0, x_pos);
+                    std::string tile_y_str = sd_tile_size_str.substr(x_pos + 1);
+                    if (tile_x_str.find('.') != std::string::npos) {
+                        tmp_x = std::round(latent_x * get_tile_factor(tile_x_str));
+                    }
+                    else {
+                        tmp_x = std::stoi(tile_x_str);
+                    }
+                    if (tile_y_str.find('.') != std::string::npos) {
+                        tmp_y = std::round(latent_y * get_tile_factor(tile_y_str));
+                    }
+                    else {
+                        tmp_y = std::stoi(tile_y_str);
+                    }
+                }
+                else {
+                    if (sd_tile_size_str.find('.') != std::string::npos) {
+                        float tile_factor = get_tile_factor(sd_tile_size_str);
+                        tmp_x = std::round(latent_x * tile_factor);
+                        tmp_y = std::round(latent_y * tile_factor);
+                    }
+                    else {
+                        tmp_x = tmp_y = std::stoi(sd_tile_size_str);
+                    }
+                }
+                tile_size_x = std::max(std::min(tmp_x, latent_x), min_tile_dimension);
+                tile_size_y = std::max(std::min(tmp_y, latent_y), min_tile_dimension);
+            } catch (const std::invalid_argument&) {
+                LOG_WARN("SD_TILE_SIZE is invalid, keeping the default");
+            } catch (const std::out_of_range&) {
+                LOG_WARN("SD_TILE_SIZE is out of range, keeping the default");
+            }
+        }
+
+        if(!decode){
+            // TODO: also use and arg for this one?
+            // to keep the compute buffer size consistent
+            tile_size_x*=1.30539;
+            tile_size_y*=1.30539;
+        }
         if (!use_tiny_autoencoder) {
             if (decode) {
                 ggml_tensor_scale(x, 1.0f / scale_factor);
             } else {
                 ggml_tensor_scale_input(x);
             }
-            if (vae_tiling && decode) {  // TODO: support tiling vae encode
+            if (vae_tiling) {
+                if (SD_TILE_SIZE != nullptr) {
+                    LOG_INFO("VAE Tile size: %dx%d", tile_size_x, tile_size_y);
+                }
+                if (SD_TILE_OVERLAP != nullptr) {
+                    LOG_INFO("VAE Tile overlap: %.2f", tile_overlap);
+                }
                 // split latent in 32x32 tiles and compute in several steps
                 auto on_tiling = [&](ggml_tensor* in, ggml_tensor* out, bool init) {
                     first_stage_model->compute(n_threads, in, decode, &out);
                 };
-                sd_tiling(x, result, 8, 32, 0.5f, on_tiling);
+                sd_tiling_non_square(x, result, 8, tile_size_x, tile_size_y, tile_overlap, on_tiling);
             } else {
                 first_stage_model->compute(n_threads, x, decode, &result);
             }
@@ -1160,7 +1253,7 @@ class StableDiffusionGGML {
             }
         } else {
             //koboldcpp never use tiling with taesd
-            if (false && vae_tiling && decode) {  // TODO: support tiling vae encode
+            if (false && vae_tiling) {  // TODO: support tiling vae encode
                 // split latent in 64x64 tiles and compute in several steps
                 auto on_tiling = [&](ggml_tensor* in, ggml_tensor* out, bool init) {
                     tae_first_stage->compute(n_threads, in, decode, &out);
