MNN Rust Bindings

Rust bindings for the MNN neural network inference engine.

Installation

Option 1: Automatic Download (Default)

This library will attempt to automatically download MNN source code when needed, but due to potential repository structure changes, it may not always work with the latest versions.

Option 2: Git Submodule (Recommended)

The most reliable method is to use git submodules:

git submodule update --init --recursive

Option 3: Manual Download

You can also manually download MNN and specify its location:

1. Clone MNN repository: git clone https://github.com/alibaba/MNN.git /path/to/mnn
2. Set environment variable: export MNN_SRC=/path/to/mnn
3. Build your project: cargo build

Environment Variables

Variable	Description
MNN_SRC	Path to MNN source code
MNN_VERSION	When downloading, specifies version tag (default: "3.0.5")
MNN_COMPILE	Set to "0" to skip compilation (requires MNN_LIB_DIR)
MNN_LIB_DIR	Path to pre-built MNN libraries
MNN_SYSTEM	Set to "1" to use system-installed MNN libraries
MNN_FORCE_DOWNLOAD	Set to "1" to force re-download of MNN source

Using System Libraries

To use system-installed MNN libraries:

MNN_SYSTEM=1 cargo build

Features

• metal - Enable Metal backend (Apple platforms)
• coreml - Enable CoreML backend (Apple platforms)
• vulkan - Enable Vulkan backend
• opencl - Enable OpenCL backend
• opengl - Enable OpenGL backend
• crt_static - Use static CRT on Windows
• openmp - Enable OpenMP (disables MNN threadpool)
• mnn-threadpool - Use MNN's threadpool (default)
• tracing - Enable tracing support
• profile - Enable profiling support
• serde - Enable serialization/deserialization support

Examples

Check the examples directory for usage examples.