#[cfg(test)]
mod backward_gradient_merge{
use flashlight_tensor::prelude::*;
use rand::prelude::*;
#[tokio::test]
async fn backprop_merged_gradient_no_activ(){
if std::env::var("CI").is_ok() {
eprintln!("Skipping GPU test in CI");
return;
}
let mut rng = rand::rng();
let size_1 = rng.random_range(2..128);
let size_2 = rng.random_range(2..128);
let grad_output: Tensor<f32> = Tensor::rand(1.0, &[size_1, size_2]);
let weights: Tensor<f32> = Tensor::rand(1.0, &[size_1, 1]);
let sample = Sample::from_data(vec!{weights.clone(), grad_output.clone()}, vec!{}, grad_output.get_shape());
let mut runner = GpuRunner::init(1, MemoryMetric::GB);
runner.append(sample);
let full_gpu_output: Vec<Tensor<f32>> = runner.backward_grad().await;
let gpu_output = full_gpu_output[0].clone();
let cpu_output = weights.matrix_transpose().unwrap().matrix_mul(&grad_output).unwrap();
let epsilon = 1e-4;
for (a, b) in gpu_output.get_data().iter().zip(cpu_output.get_data()) {
assert!((a - b).abs() < epsilon, "Values differ: GPU={} CPU={}", a, b);
}
assert_eq!(gpu_output.get_shape(), cpu_output.get_shape());
}
}