Get Started

In this section, we will guide you to start using Orion successfully. We will help you install Cairo 1.0 and add Orion dependency in your project.
Orion supports Cairo and Scarb v2.4.0

📦 Installations

Install Cairo
Step 1: Install Cairo
There are different ways to install Cairo. Use the one that suits you best: Cairo installer.
Step 2: Setup Language Server
Install the Cairo 1 VS Code Extension for proper syntax highlighting and code navigation. Just follow the steps indicated here.
Install the Cairo package manager Scarb
Step 1: Install Scarb
Follow the installation guide on the Scarb's Website.
Step 2: Create a new Scarb project
Follow the instructions here to start a new Scarb project.

⚙️ Add orion dependency in your project

If your Scarb.toml doesn't already have a [dependencies] section, add it, then list the package name and the URL to its Git repository.
orion = { git = "https://github.com/gizatechxyz/onnx-cairo" }
Now, run scarb build, and Scarb will fetch orion dependency and all its dependencies. Then it will compile your package with all of these packages included:
scarb build
You can now use the orion in your files:
use core::array::{ArrayTrait, SpanTrait};
use orion::operators::tensor::{TensorTrait, Tensor, I32Tensor};
use orion::operators::nn::{NNTrait, I32NN};
fn relu_example() -> Tensor<i32> {
let tensor = TensorTrait::<i32>::new(
shape: array![2, 2].span(),
data: array![
IntegerTrait::new(1, false),
IntegerTrait::new(2, false),
IntegerTrait::new(1, true),
IntegerTrait::new(2, true),
return NNTrait::relu(@tensor);

🔭 Discover the Orion APIs