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Layer norm tweaks (#482)

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* Add some options to make layer-norm more configurable.

* Add the rms-norm variant.

* Replace the RmsNorm with the shared bits.
This commit is contained in:
Laurent Mazare
2023-08-17 10:07:13 +01:00
committed by GitHub
parent d99cac3ec3
commit d32e8199cd
7 changed files with 124 additions and 158 deletions
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45
candle-examples/examples/llama_multiprocess/model.rs
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@ -1,6 +1,6 @@
use candle::backend::BackendStorage;
use candle::{CpuStorage, CustomOp1, DType, Device, IndexOp, Layout, Result, Shape, Tensor, D};
use candle_nn::{Embedding, Linear, VarBuilder};
use candle_nn::{rms_norm, Embedding, LayerNorm, Linear, VarBuilder};
use cudarc::nccl::safe::{Comm, ReduceOp};
use half::f16;
use std::rc::Rc;
@ -182,39 +182,6 @@ fn embedding(cfg: &Config, vb: VarBuilder) -> Result<Embedding> {
Ok(Embedding::new(embeddings, cfg.hidden_size))
}
struct RmsNorm {
scale: Tensor,
}
impl RmsNorm {
fn load(size: usize, vb: VarBuilder) -> Result<Self> {
let scale = vb.get(size, "weight")?;
Ok(Self::new(scale))
}
fn new(scale: Tensor) -> Self {
Self { scale }
}
fn forward(&self, x: &Tensor) -> Result<Tensor> {
let in_dtype = x.dtype();
// This is a no-op if x's dtype is already f32.
let x = x.to_dtype(DType::F32)?;
let (b_sz, seq_len, hidden_size) = x.shape().dims3()?;
let norm_x = (x.sqr()?.sum_keepdim(2)? / hidden_size as f64)?;
let norm_x = norm_x.broadcast_as((b_sz, seq_len, hidden_size))?;
let x_normed = (x / (norm_x + 1e-5)?.sqrt()?)?;
let size = self.scale.shape().dims1()?;
let scale = self
.scale
.to_dtype(DType::F32)?
.broadcast_as((b_sz, seq_len, size))?;
let x = (scale * x_normed)?;
let x = x.to_dtype(in_dtype)?;
Ok(x)
}
}
struct CausalSelfAttention {
qkv_proj: TensorParallelColumnLinear,
o_proj: TensorParallelRowLinear,
@ -369,14 +336,14 @@ impl Mlp {
}
struct Block {
rms_1: RmsNorm,
rms_1: LayerNorm,
attn: CausalSelfAttention,
rms_2: RmsNorm,
rms_2: LayerNorm,
mlp: Mlp,
}
impl Block {
fn new(rms_1: RmsNorm, attn: CausalSelfAttention, rms_2: RmsNorm, mlp: Mlp) -> Self {
fn new(rms_1: LayerNorm, attn: CausalSelfAttention, rms_2: LayerNorm, mlp: Mlp) -> Self {
Self {
rms_1,
attn,
@ -397,9 +364,9 @@ impl Block {
fn load(vb: VarBuilder, cache: &Cache, cfg: &Config, comm: Rc<Comm>) -> Result<Self> {
let attn = CausalSelfAttention::load(vb.pp("self_attn"), cache, cfg, comm.clone())?;
let mlp = Mlp::load(vb.pp("mlp"), cfg, comm)?;
let input_layernorm = RmsNorm::load(cfg.hidden_size, vb.pp("input_layernorm"))?;
let input_layernorm = rms_norm(cfg.hidden_size, 1e-5, vb.pp("input_layernorm"))?;
let post_attention_layernorm =
RmsNorm::load(cfg.hidden_size, vb.pp("post_attention_layernorm"))?;
rms_norm(cfg.hidden_size, 1e-5, vb.pp("post_attention_layernorm"))?;
Ok(Self::new(
input_layernorm,
attn,