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Update readme instructions for onnx export

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Nikhila Ravi 2023-04-11 11:47:31 -07:00
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demo/README.md
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@ -14,7 +14,7 @@ Navigate to [`http://localhost:8081/`](http://localhost:8081/)
Move your cursor around to see the mask prediction update in real time.
## Change the image, embedding and ONNX model
## Export the image embedding
In the [ONNX Model Example notebook](https://github.com/facebookresearch/segment-anything/blob/main/notebooks/onnx_model_example.ipynb) upload the image of your choice and generate and save corresponding embedding.
@ -37,7 +37,34 @@ image_embedding = predictor.get_image_embedding().cpu().numpy()
np.save("dogs_embedding.npy", image_embedding)
```
Save the new image and embedding in `/assets/data`and update the following paths to the files at the top of`App.tsx`:
Save the new image and embedding in `/assets/data`.
## Export the ONNX model
You also need to export the quantized ONNX model from the [ONNX Model Example notebook](https://github.com/facebookresearch/segment-anything/blob/main/notebooks/onnx_model_example.ipynb).
Run the cell in the notebook which saves the `sam_onnx_quantized_example.onnx` file, download it and copy it to the path `/model/sam_onnx_quantized_example.onnx`.
Here is a snippet of the export/quantization code:
```
onnx_model_path = "sam_onnx_example.onnx"
onnx_model_quantized_path = "sam_onnx_quantized_example.onnx"
quantize_dynamic(
model_input=onnx_model_path,
model_output=onnx_model_quantized_path,
optimize_model=True,
per_channel=False,
reduce_range=False,
weight_type=QuantType.QUInt8,
)
```
**NOTE: if you change the ONNX model by using a new checkpoint you need to also re-export the embedding.**
## Update the image, embedding, model in the app
Update the following file paths at the top of`App.tsx`:
```py
const IMAGE_PATH = "/assets/data/dogs.jpg";
@ -45,10 +72,6 @@ const IMAGE_EMBEDDING = "/assets/data/dogs_embedding.npy";
const MODEL_DIR = "/model/sam_onnx_quantized_example.onnx";
```
Optionally you can also export the ONNX model. Currently the example ONNX model from the notebook is saved at `/model/sam_onnx_quantized_example.onnx`.
**NOTE: if you change the ONNX model by using a new checkpoint you need to also re-export the embedding.**
## ONNX multithreading with SharedArrayBuffer
To use multithreading, the appropriate headers need to be set to create a cross origin isolation state which will enable use of `SharedArrayBuffer` (see this [blog post](https://cloudblogs.microsoft.com/opensource/2021/09/02/onnx-runtime-web-running-your-machine-learning-model-in-browser/) for more details)