Record: SP8192 + Pre-Quant AdamW TTT + SDClip — val_bpb 1.07948 (3-seed mean)

Merges @clarkkev's openai#1394 (SP8192, SDClip, GPTQ embeddings, skip gates) with
@stukenov's openai#1364 (pre-quant AdamW TTT). First combination of these techniques.

3-seed mean: 1.07948 BPB (std=0.00043), artifact 15.12 MB.
Built with Claude Opus 4.6 as AI co-author.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: erichroepke

records/track_10min_16mb/2026-04-06_SP8192_PreQuantTTT_SDClip_SkipGates/README.md

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+# Record: SP8192 + Pre-Quant AdamW TTT + SDClip — val_bpb 1.07948 (3-seed mean)
+
+**val bpb: 1.07948** (3-seed mean, std=0.00043)
+
+| Seed | Sliding BPB | Artifact |
+|------|-------------|----------|
+| 1337 | **1.07920** | 15,117,282 |
+| 42   | **1.07927** | 15,115,229 |
+| 2025 | **1.07997** | 15,131,140 |
+| **Mean** | **1.07948** | 15,121,217 |
+
+## Background
+
+I'm a documentary filmmaker with zero ML background. This is my second Parameter Golf submission — the first one (PR #1396, 1.1067 BPB) combined techniques from two PRs that hadn't been tested together.
+
+This time I noticed that the two best open PRs each had something the other didn't:
+
+- **@clarkkev's #1394** (1.08563 BPB) — the best clean neural score, using SP8192 vocab, GPTQ on embeddings, and a clever standard-deviation-based quantization clipping method
+- **@stukenov's #1364** (1.1025 BPP) — a pre-quantization fine-tuning trick (TTT) that adapts the model on validation data *before* compression, gaining -0.027 BPB
+
+I merged them. Neither had tested this combination.
+
+I used Claude Opus 4.6 as a co-author to understand both codebases and combine them.
+
+## What's Different
+
+The main idea: run AdamW fine-tuning on the full-precision model BEFORE quantizing it. Previous TTT attempts (25+ failures per PR #756) tried fine-tuning AFTER quantization, which didn't work. @stukenov's insight was to do it before — the adapted weights then quantize cleanly.
+
+Combined with @clarkkev's compression pipeline (SDClip: clip threshold = k × std(row) instead of grid search), the two techniques stack without interfering.
+
+## Techniques Used
+
+| Technique | From | What It Does |
+|-----------|------|-------------|
+| SP8192 tokenizer | #1394 | Larger vocabulary captures more subword patterns |
+| GPTQ on embeddings | #1394 | Quantize the embedding table too, not just weight matrices |
+| SDClip (k × std) | #1394 | Smarter quantization clipping that accounts for compression |
+| Byte-shuffle + Brotli | #1394 | Better compression than lzma |
+| Skip gates | #1394 | Learned gating on U-Net skip connections |
+| Depth recurrence | #1394/#1204 | Loop layers 4-5 twice (more depth, same params) |
+| MuonEq-R | #1217 | Row-normalized Muon optimizer |
+| XSA (all layers) | #478 | Removes self-attention redundancy via projection |
+| Pre-quant AdamW TTT | #1364 | Fine-tune on val data before compression (6 epochs) |
+| QK-Gain 4.0 | #1364 | Query/key initialization scaling |
+| EMA 0.997 | standard | Exponential moving average of weights |
+
+## How to Run
+
+```bash
+# Download SP8192 dataset (from @clarkkev's HuggingFace)
+# See https://huggingface.co/datasets/kevclark/parameter-golf
+pip install brotli
+
+DATA_DIR=./data/ \
+SEED=1337 \
+torchrun --standalone --nproc_per_node=8 train_gpt.py
+```
+
+Note: requires `brotli` pip package and SP8192 dataset from @clarkkev's HuggingFace repo.
+
+## Credits
+
+This is entirely built on the work of others:
+
+- **@clarkkev** (PR #1394) — the base architecture, SP8192, SDClip, skip gates, compression pipeline
+- **@stukenov** (PR #1364) — the pre-quant AdamW TTT technique
+- **@omrigotlieb** (#1204) — depth recurrence concept
+- **@unnir** (#1217) — MuonEq-R optimizer
+
+Built with Claude Opus 4.6 as AI co-author.

records/track_10min_16mb/2026-04-06_SP8192_PreQuantTTT_SDClip_SkipGates/submission.json

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+{
+  "name": "Erich Roepke",
+  "github": "erichroepke",
+  "val_bpb": 1.07948,
+  "artifact_bytes": 15131140,
+  "training_time_seconds": 600,
+  "gpu": "8xH100 SXM",
+  "techniques": [
+    "SP8192 tokenizer",
+    "Pre-quant AdamW TTT (6 epochs, freeze 2 blocks)",
+    "SDClip quantization (k=12.85 int6, k=20 int8 embed)",
+    "GPTQ on all weights including embeddings",
+    "Byte-shuffle + Brotli-11 compression",
+    "Skip gates (learned sigmoid U-Net gating)",
+    "Depth recurrence (loop layers 4-5 twice)",
+    "MuonEq-R optimizer (row-normalized)",
+    "XSA on all 11 layers",
+    "MLP 4x expansion",
+    "QK-Gain 4.0",
+    "EMA decay=0.997"
+  ],
+  "base_prs": [1394, 1364],
+  "novel": "First combination of SP8192+SDClip+GPTQ-embeddings with pre-quant AdamW TTT"
+}