lrm/lrm_sana/docs/checklistv2.md

# SANA LRM Checklist V2

## 1. Scope and Dependency Rules
- [x] Core parity scope is trainer architecture and runtime contracts across flux, lrm_15, lrm_xl, and lrm_sana.
- [x] `information_related_to_sana` is treated as model-specific external adapter code.
- [x] `information_related_to_flux` is treated as model-specific external adapter code.
- [x] External model adapter modules are excluded from core trainer parity checks.

## 2. Codebase Parity Against Existing Variants
- [x] SANA has expected variant-specific replacements for config/task/model/dataset/criterion modules.
- [x] SANA keeps shared trainer scaffolding structure aligned with other variants.
- [x] Launcher flow preserves profile-based behavior and runtime overrides.
- [x] Optimizer/lr-scheduler defaults are set for runnable quick smoke behavior.
- [x] Quick profile precision default updated to BF16 for stable H200 smoke runs.

## 3. Runtime Verification Evidence (centralized in log.log)
- [x] Comparison inventory and focused diffs recorded in log output.
- [x] Hydra composition succeeds (`Hydra compose bg exit code: 0`).
- [x] Deterministic quick smoke run reaches final evaluation end marker (`EVAL END (final@gstep=1)`).
- [x] Deterministic quick smoke run saves checkpoint (`checkpoint-gstep1`).
- [x] All verification command outputs are consolidated under `lrm_sana/log.log`.

## 4. Remaining Validation Items
- [ ] Initialization smoke checks for all four SANA model profiles.
- [ ] Optional distributed_sharded path validation on nodes with CUDA toolchain available for DeepSpeed ops.
- [ ] Extended multi-step sanity run (beyond max_steps=1).

## 5. Canonical Artifacts
- Main aggregated run/comparison log: `lrm_sana/log.log`
- Previous checklist: `lrm_sana/docs/checklist.md`
- This checklist revision: `lrm_sana/docs/checklistv2.md`