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// RLX — versatile ML compiler + runtime.
// Copyright (C) 2026 Eugene Hauptmann, Nataliya Kosmyna.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use anyhow::Result;
use rlx_ir::HirGraphExt;
use rlx_ir::hir::HirMut;
use super::BlockStage;
use crate::context::FlowCtx;
use crate::value::FlowValue;
#[derive(Debug, Clone)]
pub struct RmsNormStage {
pub weight_key: String,
pub eps: f32,
}
impl RmsNormStage {
pub fn new(weight_key: impl Into<String>, eps: f32) -> Self {
Self {
weight_key: weight_key.into(),
eps,
}
}
}
impl BlockStage for RmsNormStage {
fn emit(&self, ctx: &mut FlowCtx<'_>, input: FlowValue) -> Result<Option<FlowValue>> {
let gamma = ctx.load_param(&self.weight_key, false)?;
let zero_beta = ctx
.state
.zero_beta
.ok_or_else(|| anyhow::anyhow!("RmsNorm requires ZeroBeta stage"))?;
let mut gb = HirMut::new(ctx.hir());
let id = gb.rms_norm(input.id, gamma, zero_beta, self.eps);
Ok(Some(ctx.wrap(id, input.shape.clone())))
}
}