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Softmax numerical stability. (#267)

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* Softmax numerical stability.

* Fix the flash-attn test.
This commit is contained in:
Laurent Mazare
2023-07-28 13:13:01 +01:00
committed by GitHub
parent 68eab38de6
commit 3eb2bc6d07
28 changed files with 117 additions and 188 deletions
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4
candle-wasm-examples/llama2-c/src/worker.rs
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@ -1,7 +1,7 @@
use crate::model::{Cache, Config, Llama};
use byteorder::{LittleEndian, ReadBytesExt};
use candle::{DType, Device, IndexOp, Result, Shape, Tensor, D};
use candle_nn::VarBuilder;
use candle_nn::{ops::softmax, VarBuilder};
use rand::{distributions::Distribution, SeedableRng};
use serde::{Deserialize, Serialize};
use wasm_bindgen::prelude::*;
@ -88,7 +88,7 @@ impl LogitsProcessor {
pub fn sample(&mut self, logits: &Tensor) -> Result<u32> {
let logits = logits.to_dtype(DType::F32)?;
let next_token = if let Some(temperature) = self.temperature {
let prs = (&logits / temperature)?.softmax(D::Minus1)?;
let prs = softmax(&(&logits / temperature)?, D::Minus1)?;
let prs: Vec<f32> = prs.to_vec1()?;
let distr =
rand::distributions::WeightedIndex::new(prs).map_err(candle::Error::wrap)?;