openvino-rs

This repository contains the openvino-sys crate (low-level, unsafe bindings) and the openvino crate (high-level, ergonomic bindings) for accessing OpenVINO™ functionality in Rust.

Prerequisites

1. The openvino-sys crate creates bindings to the OpenVINO™ C API using bindgen; this requires a local installation of libclang. Also, be sure to retrieve all Git submodules.

2. This repo currently uses git-lfs for large file storage. If you install it before cloning this repository, it should have downloaded all large files. To check this, verify that find crates/openvino -name *.bin | xargs ls -lhr returns .bin files of tens of megabytes. If not, download the large files with:

   git lfs fetch
   git lfs checkout

3. This library binds to OpenVINO™'s shared libraries; how those native libraries are configured and installed on your system determines how these Rust bindings work. The openvino-finder crate attempts to locate the necessary libraries and configuration; if you run into problems, you may need to understand additional details documented in the openvino-finder docs.

Build from an OpenVINO™ installation

cargo build
cargo test

The quickest method to build the openvino and openvino-sys crates is with a local installation of OpenVINO™ (see, e.g., installing from an APT repository). The build script will attempt to locate an existing installation (see openvino-finder) and link against its shared libraries. Provide the OPENVINO_INSTALL_DIR environment variable to point at a specific installation. Ensure that the correct libraries are available on the system's load path; OpenVINO™'s setupvars.sh script will do this automatically (e.g., source /opt/intel/openvino/setupvars.sh).

Build for runtime linking

cargo build --features runtime-linking
cargo test --features runtime-linking

The openvino-rs crates also support linking from a shared library at runtime (i.e. dlopen-style). This allow building the crates with no OpenVINO™ installation or source code present and only later — at runtime — providing the OpenVINO™ shared libraries. All underlying system calls are wrapped so that a call to openvino_sys::library::load will link them to their shared library implementation (using the logic in openvino-finder to locate the shared libraries). For high-level users, call openvino::Core::new first to automatically load and link the libraries.

Build from OpenVINO™ sources

First, build OpenVINO by cloning the openvino repository and following the OpenVINO™ build documentation. Then, using the top-level directory as <openvino-repo> (not the CMake build directory), build this crate:

OPENVINO_BUILD_DIR=<openvino-repo> cargo build
OPENVINO_BUILD_DIR=<openvino-repo> cargo test

Some important notes about the path passed in OPENVINO_BUILD_DIR:

• <openvino-repo> should be an absolute path (or at least a path relative to the crates/openvino-sys directory, which is the current directory when used at build time)
• <openvino-repo> should either be outside of this crate's tree or in the target directory (see the limitations on cargo:rustc-link-search).

The various OpenVINO libraries and dependencies are found using the openvino-finder crate. Turn on logging to troubleshoot any issues finding the right libraries, e.g., RUST_LOG=debug OPENVINO_BUILD_DIR=... cargo build -vv.

Build without linking to OpenVINO™

OPENVINO_SKIP_LINKING=1 cargo build -vv

In some environments it may be necessary to build the openvino-sys crate without linking to the OpenVINO libraries (e.g. for docs.rs builds). In these cases, use the OPENVINO_SKIP_LINKING environment variable to skip linking entirely. The compiled crate will likely not work as expected (e.g., for inference), but it should build.

Use

After building:

• peruse the documentation for the openvino crate; this is the library you likely want to interact with from Rust.
• follow along one with of the classification examples; these examples classifies an image using pre-built models. The examples (and all tests) are runnable using cargo test (or OPENVINO_INSTALL_DIR=/opt/intel/openvino cargo test when building from an installation).

Development

Run cargo xtask --help to read up on the in-tree development tools.

License

openvino-rs is released under the same license as OpenVINO™: the Apache License Version 2.0. By contributing to the project, you agree to the license and copyright terms therein and release your contribution under these terms.