[examples] add controlnet sd3 example

examples/controlnet/README_sd3.md

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+# ControlNet training example for Stable Diffusion 3 (SD3)
+
+The `train_controlnet_sd3.py` script shows how to implement the ControlNet training procedure and adapt it for [Stable Diffusion 3](https://arxiv.org/abs/2403.03206).
+
+## Running locally with PyTorch
+
+### Installing the dependencies
+
+Before running the scripts, make sure to install the library's training dependencies:
+
+**Important**
+
+To make sure you can successfully run the latest versions of the example scripts, we highly recommend **installing from source** and keeping the install up to date as we update the example scripts frequently and install some example-specific requirements. To do this, execute the following steps in a new virtual environment:
+
+```bash
+git clone https://github.com/huggingface/diffusers
+cd diffusers
+pip install -e .
+```
+
+Then cd in the `examples/controlnet` folder and run
+```bash
+pip install -r requirements_sd3.txt
+```
+
+And initialize an [🤗Accelerate](https://github.com/huggingface/accelerate/) environment with:
+
+```bash
+accelerate config
+```
+
+Or for a default accelerate configuration without answering questions about your environment
+
+```bash
+accelerate config default
+```
+
+Or if your environment doesn't support an interactive shell (e.g., a notebook)
+
+```python
+from accelerate.utils import write_basic_config
+write_basic_config()
+```
+
+When running `accelerate config`, if we specify torch compile mode to True there can be dramatic speedups.
+
+## Circle filling dataset
+
+The original dataset is hosted in the [ControlNet repo](https://huggingface.co/lllyasviel/ControlNet/blob/main/training/fill50k.zip). We re-uploaded it to be compatible with `datasets` [here](https://huggingface.co/datasets/fusing/fill50k). Note that `datasets` handles dataloading within the training script.
+Please download the dataset and unzip it in the directory `fill50k` in the `examples/controlnet` folder.
+
+## Training
+
+First download the SD3 model from [Hugging Face Hub](https://huggingface.co/stabilityai/stable-diffusion-3-medium). We will use it as a base model for the ControlNet training.
+> [!NOTE]
+> As the model is gated, before using it with diffusers you first need to go to the [Stable Diffusion 3 Medium Hugging Face page](https://huggingface.co/stabilityai/stable-diffusion-3-medium-diffusers), fill in the form and accept the gate. Once you are in, you need to log in so that your system knows you’ve accepted the gate. Use the command below to log in:
+
+```bash
+huggingface-cli login
+```
+
+This will also allow us to push the trained model parameters to the Hugging Face Hub platform.
+
+
+Our training examples use two test conditioning images. They can be downloaded by running
+
+```sh
+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
+```
+
+Then run the following commands to train a ControlNet model.
+
+```bash
+export MODEL_DIR="stabilityai/stable-diffusion-3-medium-diffusers"
+export OUTPUT_DIR="sd3-controlnet-out"
+
+accelerate launch train_controlnet_sd3.py \
+    --pretrained_model_name_or_path=$MODEL_DIR \
+    --output_dir=$OUTPUT_DIR \
+    --train_data_dir="fill50k" \
+    --resolution=1024 \
+    --learning_rate=1e-5 \
+    --max_train_steps=15000 \
+    --validation_image "./conditioning_image_1.png" "./conditioning_image_2.png" \
+    --validation_prompt "red circle with blue background" "cyan circle with brown floral background" \
+    --validation_steps=100 \
+    --train_batch_size=1 \
+    --gradient_accumulation_steps=4
+```
+
+To better track our training experiments, we're using flags `validation_image`, `validation_prompt`, and `validation_steps` to allow the script to do a few validation inference runs. This allows us to qualitatively check if the training is progressing as expected.
+
+Our experiments were conducted on a single 40GB A100 GPU.
+
+### Inference
+
+Once training is done, we can perform inference like so:
+
+```python
+from diffusers import StableDiffusion3ControlNetPipeline, SD3ControlNetModel
+from diffusers.utils import load_image
+import torch
+
+base_model_path = "stabilityai/stable-diffusion-3-medium-diffusers"
+controlnet_path = "sd3-controlnet-out/checkpoint-6500/controlnet"
+
+controlnet = SD3ControlNetModel.from_pretrained(controlnet_path, torch_dtype=torch.float16)
+pipe = StableDiffusion3ControlNetPipeline.from_pretrained(
+    base_model_path, controlnet=controlnet
+)
+pipe.to("cuda", torch.float16)
+
+
+control_image = load_image("./conditioning_image_1.png").resize((1024, 1024))
+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, control_image=control_image
+).images[0]
+image.save("./output.png")
+```
+
+## Notes
+
+### GPU usage
+
+SD3 is a large model and requires a lot of GPU memory. 
+We recommend using one GPU with at least 80GB of memory.
+Make sure to use the right GPU when configuring the [accelerator](https://huggingface.co/docs/transformers/en/accelerate).
+
+
+## Example results
+
+#### After 500 steps with batch size 8
+
+| |  |
+|-------------------|:-------------------------:|
+|| pale golden rod circle with old lace background |
+ ![conditioning image](https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/controlnet_training/conditioning_image_1.png) | ![pale golden rod circle with old lace background](https://huggingface.co/datasets/DavyMorgan/sd3-controlnet-results/resolve/main/step-500.png) |
+
+
+#### After 6500 steps with batch size 8:
+
+| |  |
+|-------------------|:-------------------------:|
+|| pale golden rod circle with old lace background |
+ ![conditioning image](https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/controlnet_training/conditioning_image_1.png) | ![pale golden rod circle with old lace background](https://huggingface.co/datasets/DavyMorgan/sd3-controlnet-results/resolve/main/step-6500.png) |
+

examples/controlnet/requirements_sd3.txt

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+accelerate>=0.16.0
+torchvision
+transformers>=4.25.1
+ftfy
+tensorboard
+Jinja2
+datasets
+wandb