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Add tensorflow sample under samples/workload/tensorflow (#427)

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Wang Ning
2020-10-22 16:18:37 +08:00
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"tensorflow" sample introduction
==============
This sample demonstrates how to build [tensorflow](https://github.com/tensorflow/tensorflow) into WebAssembly with emcc toolchain and run it with iwasm. Please first install [emsdk](https://github.com/emscripten-core/emsdk):
```bash
git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install latest
./emsdk activate latest
```
And set up ensdk environment:
```bash
source emsdk_env.sh
```
Then run ./build.sh to build tensorflow and run it with iwasm, which basically contains the following steps:
- hack emcc to delete some objects in libc.a
- build tf-lite with emcc compiler
- build iwasm with pthread enable and include libiary under libc-emcc
- run benchmark model with iwasm:
--max-secs 300: means the max training time cost is 5 minutes, you can adjust by yourself