MDLM Diffusion — val_var_bpb 0.9901, EOS learning + full dataset shard rotation, 33M params, 1x AWS A10G#1241
Open
aiejvn wants to merge 2 commits intoopenai:mainfrom
Open
Conversation
aiejvn
changed the title
HateBunnyPlzzz
added a commit
to Itssshikhar/parameter-golf
that referenced
this pull request
Apr 2, 2026
Approaches revamped (old eval-only approaches removed): - 01: Low-Rank Factored MLP (18 layers in 16MB via rank-128 MLP factors) - 02: Reptile Meta-Learning Warmdown (meta-optimize for TTT adaptability) - 03: SVD + Quantized Factors (13 layers via spectral compression) - 04: Multi-Token Prediction + BPB-Weighted Loss (training loss innovation) - 05: Gram-Newton-Schulz + FP8 Training (30% more steps in 10 min) Unmerged PR research saved to unmerged_runs/: - PR openai#1263: SLOT (0.9354 BPB, legality contested) - PR openai#1246: Trinity Ternary (0.9650 BPB) - PR openai#1241: MDLM Diffusion (0.9901 BPB) - PR openai#1252: WARP (1.0713 BPP) - PR openai#1257: Complement Training (1.0855 BPB) - PR openai#1274: Parallel Residuals + Depth Recurrence (1.0876 BPB) - PR openai#1260: MuonEq-R + Depth Recurrence (1.0929 BPB) - PR openai#1254: XSA + LoRA TTT (1.1070 BPB) Key finding: without eval tricks, frontier is ~1.09 BPB (PR openai#1260) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Builds on PR #1106 (MDLM stack). Two additions:
EOS learning: Token 1 (<s>) is used as a document boundary anchor — never masked during diffusion. A dedicated PAD_ID=1025 (separate from MASK_ID=1024) fills post-EOS positions and is excluded from the loss, preventing collision between structural padding and diffusion masking.
Shard rotation: ShardedDataLoader loads N shards at a time and rotates between groups across training, enabling full FineWeb 10B training without loading the entire dataset into RAM. Explicit memory freeing between groups; shards loaded one-at-a-time into a pre-allocated buffer to avoid 2× peak allocation.
Ablation finding: Val BPB is flat across attention head counts {2, 4, 8, 16, 32} at fixed model dim — head count appears invariant for bidirectional diffusion LMs.
Non-record reason: Trained on 1× AWS A10G (1267 min). Requires 8×H100 SXM for wall-clock compliance.