mirror of
https://github.com/huggingface/candle.git
synced 2025-06-16 18:48:51 +00:00
20 lines
647 B
Rust
20 lines
647 B
Rust
use anyhow::{Context, Result};
|
|
use candle::{Device, Tensor};
|
|
|
|
#[test]
|
|
fn simple_grad() -> Result<()> {
|
|
let x = Tensor::var(&[3f32, 1., 4.], Device::Cpu)?;
|
|
let five = Tensor::new(&[5f32, 5., 5.], Device::Cpu)?;
|
|
let x_times_five = x.mul(&five)?;
|
|
let x2 = x.mul(&x)?;
|
|
let y = x2.add(&x_times_five)?.add(&five)?;
|
|
let grads = y.backward()?;
|
|
let grad_x = grads.get(&x.id()).context("no grad for x")?;
|
|
assert_eq!(x.to_vec1::<f32>()?, [3., 1., 4.]);
|
|
// y = x^2 + 5.x + 5
|
|
assert_eq!(y.to_vec1::<f32>()?, [29., 11., 41.]);
|
|
// dy/dx = 2.x + 5
|
|
assert_eq!(grad_x.to_vec1::<f32>()?, [11., 7., 13.]);
|
|
Ok(())
|
|
}
|