burn/crates/burn-no-std-tests/README.md

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The `burn-no-std-tests` contains integration tests aimed to check `no_std` compatibility of `burn`, `burn-core`, `burn-tensor` and `burn-ndarray` packages.
Currently there is only a minimal test that checks if mnist model can be built with `no_std`. More tests should be added to check completeness.
The continuous integration (CI) should build with additional targets:
* `wasm32-unknown-unknown` - WebAssembly
* `thumbv7m-none-eabi` - ARM Cortex-M3
* `thumbv6m-none-eabi` - ARM Cortex-M0+
Shell commands to build and test the package:
```sh
# install the new targets if not installed previously
rustup target add thumbv6m-none-eabi
rustup target add thumbv7m-none-eabi
rustup target add wasm32-unknown-unknown
# build for various targets
cargo build # regular build
cargo build --target thumbv7m-none-eabi
cargo build --target wasm32-unknown-unknown
RUSTFLAGS="--cfg portable_atomic_unsafe_assume_single_core" cargo build --target thumbv6m-none-eabi
# test
cargo test
```