You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: onnx_tests.rs
    path of file: ./repos/burn/crates/burn-import/onnx-tests/tests
    
    the code of the file until where you have to start completion: #![no_std]

/// Include generated models in the `model` directory in the target directory.
macro_rules! include_models {
    ($($model:ident),*) => {
        $(
            pub mod $model {
                include!(concat!(env!("OUT_
    
    fn flatten() {
        // Initialize the model without weights (because the exported file does not contain them)
        let device = Default::default();
        let model: flatten::Model<Backend> = flatten::Model::new(&device);

        // Run the model
        let input = Tensor::<Backend, 3>::ones([1, 5, 15], &device);
        let output = model.forward(input);

        let expected_shape = Shape::from([1, 75]);
        assert_eq!(expected_shape, output.shape());
    }