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Update INSTALL.md (#156)

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This PR suggests a way to resolve the error of `unsupported Microsoft Visual Studio version!` in INSTALL.md.
Adding `-allow-unsupported-compiler` argument for the `nvcc` worked. 

Editing [setup.py](https://github.com/facebookresearch/segment-anything-2/blob/main/setup.py) is required to add the `-allow-unsupported-compiler` argument for `nvcc`.

```python
def get_extensions():
    srcs = ["sam2/csrc/connected_components.cu"]
    compile_args = {
        "cxx": [],
        "nvcc": [
            "-DCUDA_HAS_FP16=1",
            "-D__CUDA_NO_HALF_OPERATORS__",
            "-D__CUDA_NO_HALF_CONVERSIONS__",
            "-D__CUDA_NO_HALF2_OPERATORS__",
            "-allow-unsupported-compiler"  # Add this argument
        ],
    }
    ext_modules = [CUDAExtension("sam2._C", srcs, extra_compile_args=compile_args)]
    return ext_modules
```
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jhj0517 2024-08-07 05:43:12 +09:00 committed by GitHub
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INSTALL.md
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@ -111,3 +111,33 @@ OLD_GPU, USE_FLASH_ATTN, MATH_KERNEL_ON = True, True, True
``` ```
to relax the attention kernel setting and use other kernels than Flash Attention. to relax the attention kernel setting and use other kernels than Flash Attention.
</details> </details>
<details>
<summary>
I got `Error compiling objects for extension`
</summary>
<br/>
You may see error log of:
> unsupported Microsoft Visual Studio version! Only the versions between 2017 and 2022 (inclusive) are supported! The nvcc flag '-allow-unsupported-compiler' can be used to override this version check; however, using an unsupported host compiler may cause compilation failure or incorrect run time execution. Use at your own risk.
This is probably because your versions of CUDA and Visual Studio are incompatible. (see also https://stackoverflow.com/questions/78515942/cuda-compatibility-with-visual-studio-2022-version-17-10 for a discussion in stackoverflow).<br>
You may be able to fix this by adding the `-allow-unsupported-compiler` argument to `nvcc` after L48 in the [setup.py](https://github.com/facebookresearch/segment-anything-2/blob/main/setup.py). <br>
After adding the argument, `get_extension()` will look like this:
```python
def get_extensions():
srcs = ["sam2/csrc/connected_components.cu"]
compile_args = {
"cxx": [],
"nvcc": [
"-DCUDA_HAS_FP16=1",
"-D__CUDA_NO_HALF_OPERATORS__",
"-D__CUDA_NO_HALF_CONVERSIONS__",
"-D__CUDA_NO_HALF2_OPERATORS__",
"-allow-unsupported-compiler" # Add this argument
],
}
ext_modules = [CUDAExtension("sam2._C", srcs, extra_compile_args=compile_args)]
return ext_modules
```
</details>