Eerie 👻

Eerie is a Rust binding of the IREE library. It aims to be a safe and robust API that is close to the IREE C API.

By the way, this crate is experimental, and nowhere near completion. It might contain several unsound code, and API will have breaking changes in the future. If you encounter any problem, feel free to leave an issue.

What can I do with this?

Rust has a few ML frameworks such as Candle and Burn, but none of them supports JIT/AOT model compilation. By using the IREE compiler/runtime, one can build a full blown ML library that can generate compiled models in runtime.

Also, the runtime of IREE can be small as ~30KB in bare-metal environments, so this can be used to deploy ML models in embedded rust in the future.

Supported OS

• MacOS
• Linux
• Windows
• Bare-Metal (thumb, rv32)

Examples

Compiling MLIR code into IREE VM framebuffer

// simple_mul.mlir

module @arithmetic {
  func.func @simple_mul(%arg0: tensor<4xf32>, %arg1: tensor<4xf32>) -> tensor<4xf32> {
    %0 = arith.mulf %arg0, %arg1 : tensor<4xf32>
    return %0 : tensor<4xf32>
  }
}

#[cfg(all(feature = "std", feature = "compiler"))]
fn output_vmfb() -> Vec<u8> {
    use eerie::compiler::*;
    use std::path::Path;
    let compiler = Compiler::new().unwrap();
    let mut session = compiler.create_session();
    session
        .set_flags(vec![
            "--iree-hal-target-backends=llvm-cpu".to_string(),
        ])
        .unwrap();
    let source = Source::from_file(&session, Path::new("simple_mul.mlir")).unwrap();
    let mut invocation = session.create_invocation();
    let mut output = MemBufferOutput::new(&compiler).unwrap();
    invocation
        .parse_source(source)
        .unwrap()
        .set_verify_ir(true)
        .set_compile_to_phase("end")
        .unwrap()
        .pipeline(Pipeline::Std)
        .unwrap()
        .output_vm_byte_code(&mut output)
        .unwrap();
    Vec::from(output.map_memory().unwrap())
}

Running the tensor operation in a IREE runtime environment

#[cfg(feature = "runtime")]
fn run_vmfb(vmfb: &[u8]) -> Vec<f32> {
    use eerie::runtime::*;

    let instance = vm::Instance::new().unwrap();
    let registry = hal::DriverRegistry::with_available_drivers().unwrap();
    let driver = registry.create_driver("local-task").unwrap();
    let device = driver.create_default_device().unwrap();
    let hal_module = vm::Module::hal(&instance, &device).unwrap();
    let bytecode_module = vm::Module::bytecode(&instance, vmfb).unwrap();
    let context = vm::Context::with_modules(&instance, &[&hal_module, &bytecode_module]).unwrap();
    let function = context.resolve_function("arithmetic.simple_mul").unwrap();

    let input = hal::Tensor::<f32>::from_slice(
        &device,
        &[4],
        &[1.0, 2.0, 3.0, 4.0]
    ).unwrap();
    let outputs = function.invoke_tensors(&[&input, &input], 1).unwrap();
    outputs[0].read_to_vec(&device).unwrap()
}

More examples here

Installation

The crate is divided into two sections: compiler and runtime. You can enable each functionality by toggling the "compiler" and "runtime" feature flags.

Runtime

Eerie builds the IREE runtime from source during compilation. CMake, Clang are required.

MacOS

Install XCode and MacOS SDKs.

No-std

The runtime library can be compiled without the default std feature for bare-metal targets. This requires a C/C++ embedded toolchain (arm-none-eabi-gcc/riscv64-unknown-elf-gcc) and a Rust target with alloc support. The embedded runtime path uses Rust compiler_builtins, libm, tinyrlibc, and a small critical-section backed synchronization shim instead of linking libc, libm, nosys, or pthreads.

Targets must provide:

• a global allocator
• a critical-section implementation, such as the cortex-m critical-section-single-core feature
• a linker script and startup/runtime appropriate for the board or emulator

Compiler

The user must source the precompiled shared library. (This is necessary because it takes ~20 min to build the compiler) The shared library can be sourced from a python package installation of iree-base-compiler.

pip3 install iree-base-compiler==3.11.0

In order to export the installed library location, run this script:

python -c "import iree.compiler as _; print(f'{_.__path__[0]}/_mlir_libs/')"

Then, set the rpath and envorinment variable accordingly. This can be done by adding the following .cargo/config.toml to your project directory.

MacOS

[build]
rustflags = ["-C", "link-arg=-Wl,-rpath,/path/to/library/"]
rustdocflags = ["-C", "link-arg=-Wl,-rpath,/path/to/library"]
[env]
LIB_IREE_COMPILER = "/path/to/library"

Linux

[build]
rustflags = ["-C", "link-arg=-Wl,-rpath=/path/to/library/"]
rustdocflags = ["-C", "link-arg=-Wl,-rpath=/path/to/library"]
[env]
LIB_IREE_COMPILER = "/path/to/library"

References

• Also look at SamKG/iree-rs
• Rustic MLIR Bindings raviqqe/melior

License

Apache 2.0