WIP: Get Stable DIffusion Controlnet running with DirectML via ONNX
The original conversion script is from here: https://github.com/Amblyopius/Stable-Diffusion-ONNX-FP16
For now, the conversion scripts only support diffusers format.

First you have to convert the controlnet model to ONNX. I tested with Canny and Openpose. The example script testonnxcnet.py uses Canny.
https://huggingface.co/lllyasviel/sd-controlnet-canny
Do this:

convert_controlnet_to_onnx.py --model_path="lllyasviel/sd-controlnet-canny" --output_path="./model/canny_onnx" --fp16

Optionally enable attention slicing by adding this argument(you can use auto or max):

--attention-slicing max

You now have the controlnet model converted. Next you need to convert a Stable Diffusion model to use it. Note that you can't use a model you've already converted with another script with controlnet, as it needs special inputs that standard ONNX conversions don't support, so you need to convert with this modified script. Again, you can optionally enable attention slicing by adding the same argument from before.

python conv_sdcnet_to_onnx.py --model_path "runwayml/stable-diffusion-v1-5" --output_path "./model/sd15_onnx" --fp16

Now you can run the test script. Cross your fingers!

python testonnxcnet.py

I couldn't figure out how to pass a tuple of tensors as an input with Onnxruntime, so I just modified UNet2DConditionModel and renamed it UNet2DConditionModel_Cnet so that instead of a tuple of 12 tensors, it's 12 separate tensors passed as individual arguments.