#
ControlNet

Adding Conditional Control to Text-to-Image Diffusion Models (ControlNet) by Lvmin Zhang and Maneesh Agrawala.

This example is based on the training example in the original ControlNet repository. It trains a ControlNet to fill circles using a small synthetic dataset.

##
Installing the dependencies

Before running the scripts, make sure to install the library’s training dependencies.

To successfully run the latest versions of the example scripts, we highly recommend installing from source and keeping the installation up to date. We update the example scripts frequently and install example-specific requirements.

To do this, execute the following steps in a new virtual environment:

    git clone https://github.com/huggingface/diffusers
    cd diffusers
    pip install -e .

Then navigate into the example folder

    cd examples/controlnet

Now run:

    pip install -r requirements.txt

And initialize an 🤗Accelerate environment with:

    accelerate config

Or for a default 🤗Accelerate configuration without answering questions about your environment:

    accelerate config default

Or if your environment doesn’t support an interactive shell like a notebook:

    from accelerate.utils import write_basic_config

    write_basic_config()

##
Circle filling dataset

The original dataset is hosted in the ControlNet repo, but we re-uploaded it here to be compatible with 🤗 Datasets so that it can handle the data loading within the training script.

Our training examples use `runwayml/stable-diffusion-v1-5` because that is what the original set of ControlNet models was trained on. However, ControlNet can be trained to augment any compatible Stable Diffusion model (such as `CompVis/stable-diffusion-v1-4`) or `stabilityai/stable-diffusion-2-1`.

To use your own dataset, take a look at the Create a dataset for training guide.

##
Training

Download the following images to condition our training with:

    wget https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/controlnet_training/conditioning_image_1.png

    wget https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/controlnet_training/conditioning_image_2.png

Specify the `MODEL_NAME` environment variable (either a Hub model repository id or a path to the directory containing the model weights) and pass it to the `pretrained_model_name_or_path` argument.

The training script creates and saves a `diffusion_pytorch_model.bin` file in your repository.

    export MODEL_DIR="runwayml/stable-diffusion-v1-5"
    export OUTPUT_DIR="path to save model"

    accelerate launch train_controlnet.py \
     --pretrained_model_name_or_path=$MODEL_DIR \
     --output_dir=$OUTPUT_DIR \
     --dataset_name=fusing/fill50k \
     --resolution=512 \
     --learning_rate=1e-5 \
     --validation_image "./conditioning_image_1.png" "./conditioning_image_2.png" \
     --validation_prompt "red circle with blue background" "cyan circle with brown floral background" \
     --train_batch_size=4 \
     --push_to_hub

This default configuration requires ~38GB VRAM.

By default, the training script logs outputs to tensorboard. Pass `--report_to wandb` to use Weights & Biases.

Gradient accumulation with a smaller batch size can be used to reduce training requirements to ~20 GB VRAM.

    export MODEL_DIR="runwayml/stable-diffusion-v1-5"
    export OUTPUT_DIR="path to save model"

    accelerate launch train_controlnet.py \
     --pretrained_model_name_or_path=$MODEL_DIR \
     --output_dir=$OUTPUT_DIR \
     --dataset_name=fusing/fill50k \
     --resolution=512 \
     --learning_rate=1e-5 \
     --validation_image "./conditioning_image_1.png" "./conditioning_image_2.png" \
     --validation_prompt "red circle with blue background" "cyan circle with brown floral background" \
     --train_batch_size=1 \
     --gradient_accumulation_steps=4 \
      --push_to_hub

##
Training with multiple GPUs

`accelerate` allows for seamless multi-GPU training. Follow the instructions here for running distributed training with `accelerate`. Here is an example command:

    export MODEL_DIR="runwayml/stable-diffusion-v1-5"
    export OUTPUT_DIR="path to save model"

    accelerate launch --mixed_precision="fp16" --multi_gpu train_controlnet.py \
     --pretrained_model_name_or_path=$MODEL_DIR \
     --output_dir=$OUTPUT_DIR \
     --dataset_name=fusing/fill50k \
     --resolution=512 \
     --learning_rate=1e-5 \
     --validation_image "./conditioning_image_1.png" "./conditioning_image_2.png" \
     --validation_prompt "red circle with blue background" "cyan circle with brown floral background" \
     --train_batch_size=4 \
     --mixed_precision="fp16" \
     --tracker_project_name="controlnet-demo" \
     --report_to=wandb \
      --push_to_hub

##
Example results

####
After 300 steps with batch size 8

| red circle with blue background
| cyan circle with brown floral background

####
After 6000 steps with batch size 8:

| red circle with blue background
| cyan circle with brown floral background

##
Training on a 16 GB GPU

Enable the following optimizations to train on a 16GB GPU:

- Gradient checkpointing
- bitsandbyte’s 8-bit optimizer (take a look at the [installation]((https://github.com/TimDettmers/bitsandbytes#requirements—installation) instructions if you don’t already have it installed)

Now you can launch the training script:

    export MODEL_DIR="runwayml/stable-diffusion-v1-5"
    export OUTPUT_DIR="path to save model"

    accelerate launch train_controlnet.py \
     --pretrained_model_name_or_path=$MODEL_DIR \
     --output_dir=$OUTPUT_DIR \
     --dataset_name=fusing/fill50k \
     --resolution=512 \
     --learning_rate=1e-5 \
     --validation_image "./conditioning_image_1.png" "./conditioning_image_2.png" \
     --validation_prompt "red circle with blue background" "cyan circle with brown floral background" \
     --train_batch_size=1 \
     --gradient_accumulation_steps=4 \
     --gradient_checkpointing \
     --use_8bit_adam \
      --push_to_hub

##
Training on a 12 GB GPU

Enable the following optimizations to train on a 12GB GPU:

- Gradient checkpointing
- bitsandbyte’s 8-bit optimizer (take a look at the [installation]((https://github.com/TimDettmers/bitsandbytes#requirements—installation) instructions if you don’t already have it installed)
- xFormers (take a look at the installation instructions if you don’t already have it installed)
- set gradients to `None`

    export MODEL_DIR="runwayml/stable-diffusion-v1-5"
    export OUTPUT_DIR="path to save model"

    accelerate launch train_controlnet.py \
     --pretrained_model_name_or_path=$MODEL_DIR \
     --output_dir=$OUTPUT_DIR \
     --dataset_name=fusing/fill50k \
     --resolution=512 \
     --learning_rate=1e-5 \
     --validation_image "./conditioning_image_1.png" "./conditioning_image_2.png" \
     --validation_prompt "red circle with blue background" "cyan circle with brown floral background" \
     --train_batch_size=1 \
     --gradient_accumulation_steps=4 \
     --gradient_checkpointing \
     --use_8bit_adam \
     --enable_xformers_memory_efficient_attention \
     --set_grads_to_none \
      --push_to_hub

When using `enable_xformers_memory_efficient_attention`, please make sure to install `xformers` by `pip install xformers`.

##
Training on an 8 GB GPU

We have not exhaustively tested DeepSpeed support for ControlNet. While the configuration does save memory, we have not confirmed whether the configuration trains successfully. You will very likely have to make changes to the config to have a successful training run.

Enable the following optimizations to train on a 8GB GPU:

- Gradient checkpointing
- bitsandbyte’s 8-bit optimizer (take a look at the [installation]((https://github.com/TimDettmers/bitsandbytes#requirements—installation) instructions if you don’t already have it installed)
- xFormers (take a look at the installation instructions if you don’t already have it installed)
- set gradients to `None`
- DeepSpeed stage 2 with parameter and optimizer offloading
- fp16 mixed precision

DeepSpeed can offload tensors from VRAM to either CPU or NVME. This requires significantly more RAM (about 25 GB).

You’ll have to configure your environment with `accelerate config` to enable DeepSpeed stage 2.

The configuration file should look like this:

    compute_environment: LOCAL_MACHINE
    deepspeed_config:
      gradient_accumulation_steps: 4
      offload_optimizer_device: cpu
      offload_param_device: cpu
      zero3_init_flag: false
      zero_stage: 2
    distributed_type: DEEPSPEED

See documentation for more DeepSpeed configuration options.

Changing the default Adam optimizer to DeepSpeed’s Adam `deepspeed.ops.adam.DeepSpeedCPUAdam` gives a substantial speedup but it requires a CUDA toolchain with the same version as PyTorch. 8-bit optimizer does not seem to be compatible with DeepSpeed at the moment.

    export MODEL_DIR="runwayml/stable-diffusion-v1-5"
    export OUTPUT_DIR="path to save model"

    accelerate launch train_controlnet.py \
     --pretrained_model_name_or_path=$MODEL_DIR \
     --output_dir=$OUTPUT_DIR \
     --dataset_name=fusing/fill50k \
     --resolution=512 \
     --validation_image "./conditioning_image_1.png" "./conditioning_image_2.png" \
     --validation_prompt "red circle with blue background" "cyan circle with brown floral background" \
     --train_batch_size=1 \
     --gradient_accumulation_steps=4 \
     --gradient_checkpointing \
     --enable_xformers_memory_efficient_attention \
     --set_grads_to_none \
     --mixed_precision fp16 \
     --push_to_hub

##
Inference

The trained model can be run with the StableDiffusionControlNetPipeline. Set `base_model_path` and `controlnet_path` to the values `--pretrained_model_name_or_path` and `--output_dir` were respectively set to in the training script.

    from diffusers import StableDiffusionControlNetPipeline, ControlNetModel, UniPCMultistepScheduler
    from diffusers.utils import load_image
    import torch

    base_model_path = "path to model"
    controlnet_path = "path to controlnet"

    controlnet = ControlNetModel.from_pretrained(controlnet_path, torch_dtype=torch.float16, use_safetensors=True)
    pipe = StableDiffusionControlNetPipeline.from_pretrained(
        base_model_path, controlnet=controlnet, torch_dtype=torch.float16, use_safetensors=True
    )

    # speed up diffusion process with faster scheduler and memory optimization
    pipe.scheduler = UniPCMultistepScheduler.from_config(pipe.scheduler.config)
    # remove following line if xformers is not installed
    pipe.enable_xformers_memory_efficient_attention()

    pipe.enable_model_cpu_offload()

    control_image = load_image("./conditioning_image_1.png")
    prompt = "pale golden rod circle with old lace background"

    # generate image
    generator = torch.manual_seed(0)
    image = pipe(prompt, num_inference_steps=20, generator=generator, image=control_image).images[0]

    image.save("./output.png")

##
Stable Diffusion XL

Training with Stable Diffusion XL is also supported via the `train_controlnet_sdxl.py` script. Please refer to the docs here.