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17 lines
542 B
Rust
17 lines
542 B
Rust
use anyhow::{Context, Result};
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use candle::{Device, Tensor};
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#[test]
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fn simple_grad() -> Result<()> {
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let x = Tensor::var(&[3f32, 1., 4.], Device::Cpu)?;
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let y = x.mul(&x)?.add(&x.affine(5., 0.)?)?.affine(1., 4.)?;
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let grads = y.backward()?;
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let grad_x = grads.get(&x.id()).context("no grad for x")?;
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assert_eq!(x.to_vec1::<f32>()?, [3., 1., 4.]);
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// y = x^2 + 5.x + 4
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assert_eq!(y.to_vec1::<f32>()?, [28., 10., 40.]);
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// dy/dx = 2.x + 5
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assert_eq!(grad_x.to_vec1::<f32>()?, [11., 7., 13.]);
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Ok(())
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}
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