# stable-diffusion.cpp
Inference of [Stable Diffusion](https://github.com/CompVis/stable-diffusion) in pure C/C++
## Features
- Plain C/C++ implementation based on [ggml](https://github.com/ggerganov/ggml), working in the same way as [llama.cpp](https://github.com/ggerganov/llama.cpp)
- Super lightweight and without external dependencies
- SD1.x, SD2.x and SDXL support
- !!!The VAE in SDXL encounters NaN issues under FP16, but unfortunately, the ggml_conv_2d only operates under FP16. Hence, a parameter is needed to specify the VAE that has fixed the FP16 NaN issue. You can find it here: [SDXL VAE FP16 Fix](https://huggingface.co/madebyollin/sdxl-vae-fp16-fix/blob/main/sdxl_vae.safetensors).
- [SD-Turbo](https://huggingface.co/stabilityai/sd-turbo) and [SDXL-Turbo](https://huggingface.co/stabilityai/sdxl-turbo) support
- [PhotoMaker](https://github.com/TencentARC/PhotoMaker) support.
- 16-bit, 32-bit float support
- 4-bit, 5-bit and 8-bit integer quantization support
- Accelerated memory-efficient CPU inference
- Only requires ~2.3GB when using txt2img with fp16 precision to generate a 512x512 image, enabling Flash Attention just requires ~1.8GB.
- AVX, AVX2 and AVX512 support for x86 architectures
- Full CUDA and Metal backend for GPU acceleration.
- Can load ckpt, safetensors and diffusers models/checkpoints. Standalone VAEs models
- No need to convert to `.ggml` or `.gguf` anymore!
- Flash Attention for memory usage optimization (only cpu for now)
- Original `txt2img` and `img2img` mode
- Negative prompt
- [stable-diffusion-webui](https://github.com/AUTOMATIC1111/stable-diffusion-webui) style tokenizer (not all the features, only token weighting for now)
- LoRA support, same as [stable-diffusion-webui](https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Features#lora)
- Latent Consistency Models support (LCM/LCM-LoRA)
- Faster and memory efficient latent decoding with [TAESD](https://github.com/madebyollin/taesd)
- Upscale images generated with [ESRGAN](https://github.com/xinntao/Real-ESRGAN)
- VAE tiling processing for reduce memory usage
- Control Net support with SD 1.5
- Sampling method
- `Euler A`
- `Euler`
- `Heun`
- `DPM2`
- `DPM++ 2M`
- [`DPM++ 2M v2`](https://github.com/AUTOMATIC1111/stable-diffusion-webui/discussions/8457)
- `DPM++ 2S a`
- [`LCM`](https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/13952)
- Cross-platform reproducibility (`--rng cuda`, consistent with the `stable-diffusion-webui GPU RNG`)
- Embedds generation parameters into png output as webui-compatible text string
- Supported platforms
- Linux
- Mac OS
- Windows
- Android (via Termux)
### Download weights
- download original weights(.ckpt or .safetensors). For example
- Stable Diffusion v1.4 from https://huggingface.co/CompVis/stable-diffusion-v-1-4-original
- Stable Diffusion v1.5 from https://huggingface.co/runwayml/stable-diffusion-v1-5
- Stable Diffuison v2.1 from https://huggingface.co/stabilityai/stable-diffusion-2-1
```shell
curl -L -O https://huggingface.co/CompVis/stable-diffusion-v-1-4-original/resolve/main/sd-v1-4.ckpt
# curl -L -O https://huggingface.co/runwayml/stable-diffusion-v1-5/resolve/main/v1-5-pruned-emaonly.safetensors
# curl -L -O https://huggingface.co/stabilityai/stable-diffusion-2-1/resolve/main/v2-1_768-nonema-pruned.safetensors
```
### Build
#### Build from scratch
```shell
mkdir build
cd build
cmake ..
cmake --build . --config Release
```
##### Using OpenBLAS
```
cmake .. -DGGML_OPENBLAS=ON
cmake --build . --config Release
```
##### Using CUBLAS
This provides BLAS acceleration using the CUDA cores of your Nvidia GPU. Make sure to have the CUDA toolkit installed. You can download it from your Linux distro's package manager (e.g. `apt install nvidia-cuda-toolkit`) or from here: [CUDA Toolkit](https://developer.nvidia.com/cuda-downloads). Recommended to have at least 4 GB of VRAM.
```
cmake .. -DSD_CUBLAS=ON
cmake --build . --config Release
```
##### Using HipBLAS
This provides BLAS acceleration using the ROCm cores of your AMD GPU. Make sure to have the ROCm toolkit installed.
Windows User Refer to [docs/hipBLAS_on_Windows.md](docs%2FhipBLAS_on_Windows.md) for a comprehensive guide.
```
cmake .. -G "Ninja" -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DSD_HIPBLAS=ON -DCMAKE_BUILD_TYPE=Release -DAMDGPU_TARGETS=gfx1100
cmake --build . --config Release
```
##### Using Metal
Using Metal makes the computation run on the GPU. Currently, there are some issues with Metal when performing operations on very large matrices, making it highly inefficient at the moment. Performance improvements are expected in the near future.
```
cmake .. -DSD_METAL=ON
cmake --build . --config Release
```
##### Using Flash Attention
Enabling flash attention reduces memory usage by at least 400 MB. At the moment, it is not supported when CUBLAS is enabled because the kernel implementation is missing.
```
cmake .. -DSD_FLASH_ATTN=ON
cmake --build . --config Release
```
### Run
```
usage: ./bin/sd [arguments]
arguments:
-h, --help show this help message and exit
-M, --mode [MODEL] run mode (txt2img or img2img or convert, default: txt2img)
-t, --threads N number of threads to use during computation (default: -1).
If threads <= 0, then threads will be set to the number of CPU physical cores
-m, --model [MODEL] path to model
--vae [VAE] path to vae
--taesd [TAESD_PATH] path to taesd. Using Tiny AutoEncoder for fast decoding (low quality)
--control-net [CONTROL_PATH] path to control net model
--embd-dir [EMBEDDING_PATH] path to embeddings.
--stacked-id-embd-dir [DIR] path to PHOTOMAKER stacked id embeddings.
--input-id-images-dir [DIR] path to PHOTOMAKER input id images dir.
--normalize-input normalize PHOTOMAKER input id images
--upscale-model [ESRGAN_PATH] path to esrgan model. Upscale images after generate, just RealESRGAN_x4plus_anime_6B supported by now.
--upscale-repeats Run the ESRGAN upscaler this many times (default 1)
--type [TYPE] weight type (f32, f16, q4_0, q4_1, q5_0, q5_1, q8_0)
If not specified, the default is the type of the weight file.
--lora-model-dir [DIR] lora model directory
-i, --init-img [IMAGE] path to the input image, required by img2img
--control-image [IMAGE] path to image condition, control net
-o, --output OUTPUT path to write result image to (default: ./output.png)
-p, --prompt [PROMPT] the prompt to render
-n, --negative-prompt PROMPT the negative prompt (default: "")
--cfg-scale SCALE unconditional guidance scale: (default: 7.0)
--strength STRENGTH strength for noising/unnoising (default: 0.75)
--style-ratio STYLE-RATIO strength for keeping input identity (default: 20%)
--control-strength STRENGTH strength to apply Control Net (default: 0.9)
1.0 corresponds to full destruction of information in init image
-H, --height H image height, in pixel space (default: 512)
-W, --width W image width, in pixel space (default: 512)
--sampling-method {euler, euler_a, heun, dpm2, dpm++2s_a, dpm++2m, dpm++2mv2, lcm}
sampling method (default: "euler_a")
--steps STEPS number of sample steps (default: 20)
--rng {std_default, cuda} RNG (default: cuda)
-s SEED, --seed SEED RNG seed (default: 42, use random seed for < 0)
-b, --batch-count COUNT number of images to generate.
--schedule {discrete, karras, ays}
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