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update with installation issues
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README.md

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@@ -37,12 +37,9 @@ The easist way is to install from PyPI. In this way it will build the CUDA code
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pip install nerfacc
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```
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Or install from source.
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Or install from source. In this way it will build the CUDA code during installation.
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```
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# build CUDA during installation
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pip install git+https://github.com/KAIR-BAIR/nerfacc.git
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# build CUDA on the first run (JIT)
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BUILD_NO_CUDA=1 pip install git+https://github.com/KAIR-BAIR/nerfacc.git
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```
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We also provide pre-built wheels covering major combinations of Pytorch + CUDA supported by [official Pytorch](https://pytorch.org/get-started/previous-versions/).
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- [instant-nsr-pl](https://github.com/bennyguo/instant-nsr-pl): NeuS in 10 minutes.
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## Build Status
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## Common Installation Issues
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We
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#### Linux & Windows
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<details>
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<summary>ImportError: .../csrc.so: undefined symbol</summary>
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If you are installing a pre-built wheel, make sure the Pytorch and CUDA version matchs with the nerfacc version (nerfacc.__version__).
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</details>
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## Citation
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