Record: Phrase Cache + N-gram Backoff + EMA-GPU (val_bpb=0.2722)

records/track_10min_16mb/2026-03-28_PreEnrich_EMA-GPU_SmearGate_XSA4_1.1478/README.md

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+# Pre-Enrichment + EMA-GPU + SmearGate + XSA4
+
+val_bpb: **1.1478** (sliding window, stride=64) | 14.94 MB | 8xH100 SXM, 600s
+
+### 3-Seed Results
+
+| Seed | Steps | val_bpb (sliding) | Artifact |
+|---|---|---|---|
+| 1337 | 9,268 | 1.1478 | 14,942,971 |
+| 42 | 9,318 | 1.1468 | 14,922,769 |
+| 3011 | 9,322 | 1.1463 | 14,939,305 |
+| **Mean** | — | **1.1470** | — |
+| **Std** | — | **0.0008** | — |
+
+## Architecture
+
+- **Model**: 10L, 512d, 8H/4KV GQA, MLP 3x, tied embeddings
+- **GELU Pre-Enrichment** (512->768->512): wider nonlinear transformation before transformer blocks
+- **XSA** on last 4 layers: removes self-value bias (arXiv:2603.09078)
+- **SmearGate**: per-dim gate blending each token with previous token
+- **BigramHash** (2048x128): hash-table embedding for token bigrams
+- **U-Net skip connections**: encoder-decoder with learned skip weights
+- **EMA** (decay=0.997) on GPU: 37% faster training (64.7ms vs 101ms/step)
+- **Int6 QAT + lzma**: 14.94 MB artifact, quant gap 0.004
+- **Sliding window eval**: stride=64, seq_len=2048
+
+## Training
+
+Muon+AdamW, WD=0.04, matrix_lr=0.025, warmdown=3500, batch=524K, seq=2048.
+9,268 steps in 600s at 64.7ms/step.
+
+## Key Metrics
+
+| Metric | Value |
+|---|---|
+| val_bpb (sliding window) | 1.1478 |
+| Post-quant val_bpb (standard) | 1.1690 |
+| Pre-quant val_bpb | 1.1646 |
+| Quant gap | 0.004 |
+| Training time | 600,031ms (9,268 steps at 64.7ms) |
+| Artifact size | 14,942,971 bytes |
+| Model parameters | 25,254,992 |
+
+## Credits
+
+- Muon optimizer — modded-nanogpt baseline (kellerjordan)
+- SmearGate + BigramHash — PR #65 (@aquariouseworkman)
+- XSA — arXiv:2603.09078; GQA-aware PR #265 (@unnir)
+- EMA + GPTQ-lite + warmdown tuning — PR #414 (@signalrush)
+- Overtone init — modded-nanogpt baseline
+- GELU Pre-Enrichment — original to this submission
+- EMA on GPU — original to this submission
+
+## Reproduction
+
+```
+python3 data/cached_challenge_fineweb.py --variant sp1024 --train-shards 80
+torchrun --standalone --nproc_per_node=8 train_gpt.py
+```
+8xH100 SXM, 600s training + ~120s eval.

records/track_10min_16mb/2026-03-28_PreEnrich_EMA-GPU_SmearGate_XSA4_1.1478/submission.json

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+{
+  "author": "Idanr",
+  "github_id": "idan3011",
+  "name": "Pre-Enrichment + EMA-GPU + SmearGate + XSA4",
+  "blurb": "GELU pre-enrichment (512->768->512), EMA on GPU (64.7ms/step, 37% faster), SmearGate, BigramHash(2048x128), XSA on last 4 layers, U-Net skip connections. 10L 512d, int6 QAT + lzma.",
+  "date": "2026-03-28T00:00:00Z",
+  "val_loss": 1.93793804,
+  "val_bpb": 1.14775606,
+  "pre_quant_val_loss": 1.9663,
+  "pre_quant_val_bpb": 1.1646,
+  "step_stop": 9268,
+  "wallclock_seconds": 600.031,
+  "eval_time_seconds": 120.0,
+  "bytes_total": 14942971,
+  "bytes_model_int6_lzma": 14878748,
+  "bytes_code": 64223
+}

records/track_10min_16mb/2026-03-28_PreEnrich_EMA-GPU_SmearGate_XSA4_1.1478/train.log

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+W0326 02:39:19.172000 34413 torch/distributed/run.py:803]
+W0326 02:39:19.172000 34413 torch/distributed/run.py:803] *****************************************
+W0326 02:39:19.172000 34413 torch/distributed/run.py:803] Setting OMP_NUM_THREADS environment variable for each process to be 1 in default, to avoid your system being overloaded, please further tune the variable for optimal performance in your application as needed.
+W0326 02:39:19.172000 34413 torch/distributed/run.py:803] *****************************************
+logs/0d771539-26db-4427-b5a8-0a4c24bd56ad.txt
+val_bpb:enabled tokenizer_kind=sentencepiece tokenizer_path=./data/tokenizers/fineweb_1024_bpe.model
+train_loader:dataset:fineweb10B_sp1024 train_shards:80
+val_loader:shards pattern=./data/datasets/fineweb10B_sp1024/fineweb_val_*.bin tokens:62021632
+model_params:25254992
+world_size:8 grad_accum_steps:1
+sdp_backends:cudnn=True flash=True mem_efficient=False math=False
+attention_mode:gqa num_heads:8 num_kv_heads:4
+tie_embeddings:True embed_lr:0.035 head_lr:0.0 matrix_lr:0.025 scalar_lr:0.025
+train_batch_tokens:524288 train_seq_len:2048 iterations:20000 warmup_steps:20 max_wallclock_seconds:600.000
+seed:1337
+warmup_step:1/20
+warmup_step:2/20
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+stopping_early: wallclock_cap train_time:600031ms step:9268/20000
+peak memory allocated: 13058 MiB reserved: 13280 MiB
+swa: averaging 14 checkpoints on top of EMA
+ema: loading weights
+Serialized model: 99486509 bytes
+Code size: 64223 bytes
+Total submission size: 99550732 bytes
+Serialized model int6+lzma: 14878748 bytes (payload:25993024 raw_torch:26045291 payload_ratio:3.83x)
+Total submission size int6+lzma: 14942971 bytes
+final_int8_zlib_roundtrip val_loss:1.9738 val_bpb:1.1690 eval_time:2054ms
+final_int8_zlib_roundtrip_exact val_loss:1.97382834 val_bpb:1.16901232
+final_sliding_window val_bpb:1.1478 eval_time:120000ms
+final_sliding_window_exact val_bpb:1.14775606