rlx-flow 0.2.1

Block assembly-line API for RLX model builders — fusion-first, config-driven
Documentation 
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// RLX — versatile ML compiler + runtime.
// Copyright (C) 2026 Eugene Hauptmann, Nataliya Kosmyna.

use anyhow::Result;
use rlx_ir::HirGraphExt;
use rlx_ir::hir::HirMut;

use super::BlockStage;
use crate::context::FlowCtx;
use crate::value::FlowValue;

/// Save tensor for a later [`ResidualAddStage`].
#[derive(Debug, Clone, Copy, Default)]
pub struct ResidualSaveStage;

impl BlockStage for ResidualSaveStage {
    fn emit(&self, ctx: &mut FlowCtx<'_>, input: FlowValue) -> Result<Option<FlowValue>> {
        ctx.state.residual_skip = Some(input.id);
        ctx.state.residual_shape = Some(input.shape.clone());
        Ok(Some(input))
    }
}

/// Add the tensor saved by [`ResidualSaveStage`].
#[derive(Debug, Clone, Copy, Default)]
pub struct ResidualAddStage;

impl BlockStage for ResidualAddStage {
    fn emit(&self, ctx: &mut FlowCtx<'_>, input: FlowValue) -> Result<Option<FlowValue>> {
        let skip = ctx
            .state
            .residual_skip
            .ok_or_else(|| anyhow::anyhow!("ResidualAdd requires ResidualSave"))?;
        let shape = ctx
            .state
            .residual_shape
            .clone()
            .ok_or_else(|| anyhow::anyhow!("ResidualAdd missing saved shape"))?;
        let mut gb = HirMut::new(ctx.hir());
        let id = gb.add(input.id, skip);
        ctx.state.residual_skip = None;
        ctx.state.residual_shape = None;
        Ok(Some(ctx.wrap(id, shape)))
    }
}