Submission/fastattn mtp dr

records/track_10min_16mb/2026-04-17_FastAttn_MTP_DepthRec/README.md

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+# FastAttn + MTP + Depth-Recurrence (10 min, 16 MB)
+
+A pragmatic fork of the proven 43ms/step baseline with three targeted upgrades
+that are known to improve per-step quality without hurting throughput.
+
+## Why this plan
+
+The baseline (9L × 512d, pure SDPA GQA attention) hits **43 ms/step** and
+**val_bpb = 1.2244** in 10 minutes. The previous `GatedMixer` attempt ran at
+220 ms/step — 5x slower — which cannot reach competitive scores regardless of
+tuning. This record throws out exotic mixers and instead layers three
+well-established techniques on the fast baseline.
+
+## Upgrades vs. baseline
+
+| # | Upgrade | Effect |
+|---|---------|--------|
+| 1 | **Depth recurrence** — run block stack `NUM_REPS=2` times, weights shared | +100% compute per step, 0 extra params. Works well under a parameter-size cap. |
+| 2 | **Multi-token prediction (MTP)** — aux CE loss on token `t+2` via a tiny projection | +3-5% BPB reduction at same tokens (DeepSeek-V3, MoC). Disabled at eval. |
+| 3 | **Wider model (576 vs 512), fewer layers (7 vs 9)** | Same param budget, more attention heads see the data, better GQA layout (8/2). |
+
+Everything else (Muon, SDPA/FlashAttn, U-Net skips, tied embeddings, int8+zlib
+GPTQ, logit softcap) is inherited verbatim from the baseline.
+
+## Architecture
+
+- **Layout**: 7 layers × 576 dim, 8 heads / 2 KV heads, MLP×2 (ReLU²).
+- **Effective depth**: 14 (7 physical × 2 reps).
+- **Vocab**: 1024 SentencePiece BPE, tied embed/unembed.
+- **Context**: 1024 tokens.
+- **Recurrence gate**: per-rep learned vector, init 0 → training learns to lean
+  on recurrence gradually. At init the model behaves identically to the
+  baseline U-Net.
+- **MTP**: single `CastedLinear(d,d)` → RMSNorm → tied head, predicting
+  `target[t+1]` from hidden at `t`. Aux loss weight 0.3, training only.
+
+## Training recipe
+
+- **Steps**: 12000 target (wall-clock cap at 590s usually stops earlier).
+- **Batch**: 524288 tokens/step, seq_len 1024.
+- **Schedule**: 30-step warmup, flat, 1500-step linear cooldown.
+- **Optimizers**: Muon (matrices, lr=0.04), Adam (embeddings lr=0.05, scalars
+  lr=0.04).
+- **No mid-training validation** — eats the wall-clock budget. Final eval runs
+  once post-training over full validation split.
+
+## Expected outcome
+
+- **Target: `val_bpb` ≈ 1.08–1.15**, a meaningful jump from baseline 1.22.
+- Reaching 1.02 likely requires 2-3 more iterations on top (span corruption,
+  4x recurrence, maybe distillation). This is a solid foundation.
+
+## Reproduce
+
+```bash
+# one-time
+pip install brotli sentencepiece -q
+python3 data/cached_challenge_fineweb.py --variant sp1024
+
+# full 8xH100 run
+SEED=42 bash records/track_10min_16mb/2026-04-17_FastAttn_MTP_DepthRec/run_leaderboard_8xh100.sh 2>&1 | tee train_seed42.log
+
+# smoke (1 GPU, 2 min)
+bash records/track_10min_16mb/2026-04-17_FastAttn_MTP_DepthRec/run_smoke_1gpu.sh
+```
+
+## Files
+
+- `train_gpt.py` — forked from root baseline + depth-recurrence + MTP
+- `run_leaderboard_8xh100.sh` — production launcher
+- `run_smoke_1gpu.sh` — sanity check
+- `submission.json` — leaderboard metadata (val_bpb filled after run)

records/track_10min_16mb/2026-04-17_FastAttn_MTP_DepthRec/run_leaderboard_8xh100.sh

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+#!/usr/bin/env bash
+# FastAttn + MTP + Depth-Recurrence leaderboard run (8xH100, 10-min cap).
+#
+# Strategy: fork of the proven 43ms/step baseline, with three surgical upgrades:
+#   (1) depth recurrence (weights shared across NUM_REPS passes)
+#   (2) multi-token prediction (auxiliary loss at t+2)
+#   (3) slightly bigger width (576 vs 512) since DR is param-free
+set -euo pipefail
+
+: "${DATA_PATH:=./data/datasets/fineweb10B_sp1024}"
+: "${TOKENIZER_PATH:=./data/tokenizers/fineweb_1024_bpe.model}"
+: "${SEED:=42}"
+: "${RUN_ID:=fastattn_mtp_dr_$(date +%s)}"
+
+export NCCL_IB_DISABLE=1
+export TORCH_CUDNN_V8_API_ENABLED=1
+export CUDA_DEVICE_MAX_CONNECTIONS=1
+export OMP_NUM_THREADS=1
+
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TRAIN="${HERE}/train_gpt.py"
+
+DATA_PATH="${DATA_PATH}" \
+TOKENIZER_PATH="${TOKENIZER_PATH}" \
+SEED="${SEED}" \
+RUN_ID="${RUN_ID}" \
+MAX_WALLCLOCK_SECONDS="${MAX_WALLCLOCK_SECONDS:-590}" \
+ITERATIONS="${ITERATIONS:-12000}" \
+WARMUP_STEPS="${WARMUP_STEPS:-30}" \
+WARMDOWN_ITERS="${WARMDOWN_ITERS:-1500}" \
+VAL_LOSS_EVERY="${VAL_LOSS_EVERY:-0}" \
+TRAIN_LOG_EVERY="${TRAIN_LOG_EVERY:-100}" \
+TRAIN_SEQ_LEN="${TRAIN_SEQ_LEN:-1024}" \
+TRAIN_BATCH_TOKENS="${TRAIN_BATCH_TOKENS:-524288}" \
+VOCAB_SIZE="${VOCAB_SIZE:-1024}" \
+NUM_LAYERS="${NUM_LAYERS:-7}" \
+MODEL_DIM="${MODEL_DIM:-576}" \
+NUM_HEADS="${NUM_HEADS:-8}" \
+NUM_KV_HEADS="${NUM_KV_HEADS:-2}" \
+MLP_MULT="${MLP_MULT:-2}" \
+NUM_REPS="${NUM_REPS:-2}" \
+MTP_WEIGHT="${MTP_WEIGHT:-0.3}" \
+TIE_EMBEDDINGS="${TIE_EMBEDDINGS:-1}" \
+TIED_EMBED_LR="${TIED_EMBED_LR:-0.05}" \
+MATRIX_LR="${MATRIX_LR:-0.04}" \
+SCALAR_LR="${SCALAR_LR:-0.04}" \
+QK_GAIN_INIT="${QK_GAIN_INIT:-1.5}" \
+torchrun --standalone --nproc_per_node=8 "${TRAIN}"

records/track_10min_16mb/2026-04-17_FastAttn_MTP_DepthRec/run_smoke_1gpu.sh

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+#!/usr/bin/env bash
+# Single-GPU smoke test to verify the new arch compiles and trains a few steps.
+set -euo pipefail
+
+: "${DATA_PATH:=./data/datasets/fineweb10B_sp1024}"
+: "${TOKENIZER_PATH:=./data/tokenizers/fineweb_1024_bpe.model}"
+
+export NCCL_IB_DISABLE=1
+export TORCH_CUDNN_V8_API_ENABLED=1
+export CUDA_DEVICE_MAX_CONNECTIONS=1
+export OMP_NUM_THREADS=1
+
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TRAIN="${HERE}/train_gpt.py"
+
+DATA_PATH="${DATA_PATH}" \
+TOKENIZER_PATH="${TOKENIZER_PATH}" \
+RUN_ID="smoke_$(date +%s)" \
+MAX_WALLCLOCK_SECONDS=120 \
+ITERATIONS=200 \
+WARMUP_STEPS=10 \
+WARMDOWN_ITERS=50 \
+VAL_LOSS_EVERY=0 \
+TRAIN_LOG_EVERY=20 \
+TRAIN_SEQ_LEN=1024 \
+TRAIN_BATCH_TOKENS=65536 \
+VOCAB_SIZE=1024 \
+NUM_LAYERS=4 \
+MODEL_DIM=256 \
+NUM_HEADS=4 \
+NUM_KV_HEADS=1 \
+MLP_MULT=2 \
+NUM_REPS=2 \
+MTP_WEIGHT=0.3 \
+TIE_EMBEDDINGS=1 \
+torchrun --standalone --nproc_per_node=1 "${TRAIN}"

records/track_10min_16mb/2026-04-17_FastAttn_MTP_DepthRec/submission.json

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+{
+  "track": "track_10min_16mb",
+  "name": "FastAttn_MTP_DepthRec",
+  "date": "2026-04-17",
+  "val_loss": null,
+  "val_bpb": null,
+  "bytes_total": null,
+  "bytes_code": null,
+  "bytes_model": null,
+  "training_time_seconds": 600,
+  "gpus": "8xH100",
+  "notes": "Fork of proven baseline. Adds (1) depth recurrence NUM_REPS=2, (2) multi-token prediction MTP_WEIGHT=0.3, (3) width 576 (vs 512). 7 physical layers, 14 effective via recurrence."
+}