use super::*;
use burn_tensor::TensorData;

#[test]
fn should_diff_neg() {
    let data_1 = TensorData::from([[1.0, 7.0], [2.0, 3.0]]);
    let data_2 = TensorData::from([[4.0, 7.0], [2.0, 3.0]]);

    let device = Default::default();
    let tensor_1 = TestAutodiffTensor::<2>::from_data(data_1, &device).require_grad();
    let tensor_2 = TestAutodiffTensor::from_data(data_2, &device).require_grad();

    let tensor_3 = tensor_1.clone().matmul(tensor_2.clone().neg());
    let tensor_4 = tensor_3.neg();
    let grads = tensor_4.backward();

    let grad_1 = tensor_1.grad(&grads).unwrap();
    let grad_2 = tensor_2.grad(&grads).unwrap();

    grad_1
        .to_data()
        .assert_eq(&TensorData::from([[11.0, 5.0], [11.0, 5.0]]), false);
    grad_2
        .to_data()
        .assert_eq(&TensorData::from([[3.0, 3.0], [10.0, 10.0]]), false);
}