WasmEdge only supports one backend at the same time?

[KeeganJin]

Hi all,
I noticed that the backends are exclusive based on the instruction, it said that developers can only choose and install one backend for the WASI-NN plug-in.
Does that also mean wasi_nn-pytorch and wasmedge_tensorflow (not using wasi_nn) plugins cannot be supported at the same time?
I tried curl -sSf https://raw.githubusercontent.com/WasmEdge/WasmEdge/master/utils/install.sh | bash -s -- --plugins wasi_nn-pytorch wasmedge_tensorflow to install two plugins,
but then the wasi_nn-pytorch plugin in the wasi-nn example didn't work anymore.

[2023-09-19 17:25:21.414] [error] loading failed: invalid path, Code: 0x20
[2023-09-19 17:25:21.414] [error]     load library failed:libtorch.so: cannot open shared object file: No such file or directory
Error: Plugin(NotFound("wasi_nn"))

Thanks in advance. :)

[hydai]

If you want to have a WASI-NN plugin with multiple backends, please build from source with specifying the `-DWASMEDGE_PLUGIN_WASI_NN_BACKEND="X;Y;Z".

[KeeganJin]

Thanks a lot, I will try it!