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Author SHA1 Message Date
Andrej Karpathy d6c4f3b923 i think this is the new torch 2.9+ API for declaring tf32 preference 2026-01-30 17:03:15 +00:00
Andrej Karpathy 067daa7758 small fix cpu script ty PR #474 2026-01-30 02:11:25 +00:00
Andrej Karpathy 6a341f2ecf contiguous views and single HtoD transfer for inputs/targets much cleaner 2026-01-30 00:23:01 +00:00
Andrej Karpathy ebd4d9bbf5 tried muonh, appealing but didn't work out of the box 2026-01-29 19:01:36 +00:00
Andrej Karpathy 41bb2eac32 Combine AdamW and Muon into single MuonAdamW optimizer, cleaner, ty @chrisjmccormick for idea/help 2026-01-29 00:52:08 +00:00
Andrej Karpathy 64a651a63c include .claude is ok 2026-01-29 00:35:02 +00:00
Andrej Karpathy 65df0de42b add arxiv reading skill 2026-01-29 00:34:24 +00:00
Andrej Karpathy 74554be3b5 revert engram, not seeing an improvement at larger scale 2026-01-28 20:07:39 +00:00
Andrej Karpathy c88bbf8133 Merge branch 'engram' 2026-01-27 22:33:16 +00:00
Andrej Karpathy c8d93beed2 add engram-lite, add log, tune scaling laws analysis scripts 2026-01-27 22:31:17 +00:00
Andrej Karpathy 8630d32be4 quick fix to not OOM main speedrun script 2026-01-26 22:31:42 +00:00
Andrej Karpathy 59e36cc727 first version of engram following modded nanogpt style 2026-01-25 18:59:51 +00:00
Andrej Karpathy 85b3e95e09 320 experiments just to tune the adam beta1 of x0 a little bit up from 0.8 to 0.96 2026-01-25 00:04:02 +00:00
Andrej Karpathy 63bb5831e2 something i've wanted to do for a while - move all .sh runs to their own directory so they don't pollute root dir 2026-01-18 15:27:41 +00:00
Andrej Karpathy a91743c168 Merge branch 've' 2026-01-18 15:14:39 +00:00
Andrej Karpathy d58fcd9d73 log for jan 17 2026-01-18 03:01:17 +00:00
Andrej Karpathy babde18ce1 small tweaks 2026-01-18 03:00:38 +00:00
Andrej Karpathy cf5c9e5b8e resolve a crash for odd depths because FA3 needs head_dim % 8 == 0 2026-01-18 00:07:08 +00:00
Andrej Karpathy 413e91aa0f optimal ratio is now around 4 2026-01-17 23:51:09 +00:00
Andrej Karpathy e7ed2082b8 update the default GPTConfig kwargs otherwise they are confusing 2026-01-17 21:16:46 +00:00
karpathy f9a7e0f111 update the CPU/MPS script to give reasonable results. The model can at least answer that Paris is the capital of France and knows that the sky is blue, for about 40 minutes of training on my macbook. Also fixed a bug that existed due to KVCache bfloat16 dtype assumption 2026-01-17 12:27:30 -08:00
Andrej Karpathy f5425245f9 more GPU types from PR 147 thanks @Qubitium 2026-01-17 03:22:20 +00:00
Andrej Karpathy 2955650327 add detection of device to report more correct mfu for bf16 2026-01-17 03:16:14 +00:00
Andrej Karpathy 6460dc6382 tweaks to readme a bit 2026-01-17 02:28:31 +00:00
Andrej Karpathy 1933e85046 brief update to log 2026-01-17 00:25:50 +00:00
Andrej Karpathy 3b95d4fd39 allow label for scaling laws script 2026-01-17 00:23:30 +00:00
Andrej Karpathy e85db6b4a4 alternating design 2026-01-16 23:52:12 +00:00
Andrej Karpathy 9a88194c3f simply one VE per layer, works best 2026-01-16 22:08:52 +00:00
Andrej Karpathy 0b58d70e99 full ve version works very well 2026-01-16 21:16:47 +00:00
Andrej Karpathy e3f58b838e ranked version 2026-01-16 20:59:42 +00:00
Andrej Karpathy 184d4c12b1 also add to log about the FA3 changes 2026-01-16 18:25:04 +00:00
Andrej Karpathy b62a5bc44a naturally i failed to include the actual code in the previous commit facepalm 2026-01-16 17:39:41 +00:00
Andrej Karpathy 8203efa919 implement flash attention 3 fallback to pytorch sdpa by touching as few lines of code as possible in main files and keeping all implementation to a single file. add tests. add helpful warning messages for the user. 2026-01-16 17:37:51 +00:00
Andrej Karpathy fbf2bbea25 update log with a bunch of attempts 2026-01-16 02:21:17 +00:00
Andrej Karpathy 747ed4491f add negative result on olmo3 pretraining mix 2026-01-16 00:44:01 +00:00
Andrej Karpathy 7d1700c521 add zstd lib 2026-01-16 00:44:01 +00:00
Andrej Karpathy bdcc030ffa oops legacy spurious line now 2026-01-15 23:32:20 +00:00
Andrej Karpathy 22a71aa3d3 fuse adamw into a single torch compiled kernel similar to muon. it's about 1.7X faster, but overall it's so tiny that it's not making a major dent 2026-01-15 23:30:44 +00:00
Andrej Karpathy 255f8b9af6 cleanly separate cpu and gpu sections 2026-01-15 23:30:11 +00:00
Andrej Karpathy 6bb92403d5 changes and optimizations to muon, making it more efficient and simpler/cleaner a bit 2026-01-15 03:20:48 +00:00
Andrej Karpathy 3142ca1a28 minor helpful message 2026-01-15 03:20:21 +00:00
Andrej Karpathy 7312ec9898 fix buggy midtrain and update all kwargs to be idiomatic. that is, argparse uses dashes variables use underscores. the underscores are just a remnant of the previous Configurator object. This is the right way 2026-01-13 22:45:27 +00:00
Andrej Karpathy 3b50b77ed3 fix base_loss to report correct loss by switching the dataloader to the new default 2026-01-13 22:09:36 +00:00
Andrej Karpathy f92efce169 add negative result about not allowing attention across BOS tokens. A lot more code complexity for basically no gain in performance 2026-01-13 21:33:54 +00:00
Andrej Karpathy 43c29dd9d5 Big DataLoader refactor: BOS-aligned dataloaders with epoch tracking for pre/mid-training 
The new DataLoader ensures that every token sequence in train/val batches has a BOS token
at the beginning. Therefore, no token streams start abruptly in the middle of a document,
which could be confusing for the model. Note that this changes the loss scale because there
are fewer confusing tokens in the train/val batches. The main downside is that we now waste
about 35% of tokens due to cropping. This is ok because we have a lot of data. See dev/LOG.md
entry for this change for a lot more information.
 2026-01-13 20:05:47 +00:00
Andrej Karpathy 23985413aa adjust the comment on the regex pattern per recent experimnet see dev/LOG.md 2026-01-13 17:50:39 +00:00
Andrej Karpathy 64b48d0e5c validated that \p{N}{1,2} is the correct number of digits to group up to in the regex pattern of the GPT-4 tokenizer (2 down from 3), leading to the best val_bpb for 32K vocabs 2026-01-13 17:45:06 +00:00
Andrej Karpathy 238353c998 document my struggle with fp8 integration yesterday, it's not working like i thought it would and i suffered. one day i will return to continue the fight. 2026-01-13 17:14:29 +00:00
Andrej Karpathy 4610a838a1 record negative result on MTP 2026-01-12 05:23:47 +00:00
Andrej Karpathy 21608ec51e allow base_loss to report the loss of any arbitrary huggingface model similar to base_eval. had to change dataloader to be a lot better and just take tokenizer, not load the nanochat one. much better this way anyway 2026-01-12 03:10:13 +00:00
Andrej Karpathy aa95fb2e03 make miniseries more generic and easier to run and less hard coded 2026-01-12 02:54:35 +00:00
Andrej Karpathy b33e394528 oops actually make SSSL the default window pattern 2026-01-11 21:50:35 +00:00
Andrej Karpathy fbc1484e8c add alternating window size patterns for the GPT layers, following GPT-3. Experimented a bit and found the pattern SSSL to work well - 3 short, 1 long alternating. This is now the new default and the plots look quite a bit better on flops vs. bpb 2026-01-11 21:49:54 +00:00
Andrej Karpathy 2ff7d51252 integrate Flash Attention 3. +9% tok_per_sec for d12 with ctx even as low as 2048 out of the box nice. also, ready to tune windows huge 2026-01-11 20:33:19 +00:00
Andrej Karpathy 201d705957 recover the ability to load old checkpoints by patching the lambdas if they don't exist in checkpoints 2026-01-11 20:13:12 +00:00
Andrej Karpathy aa530cdad5 Add learnable lambdas that gate the residual connection and a skip connection to the input embeddings, solid bump to val_bpb 2026-01-11 18:47:35 +00:00
Andrej Karpathy 2c4473dd1b Big Muon optimizer changes inspired by latest of modded-nanogpt. Added Polar Express, Adafactor-style variance reduction, cautious weight decay, schedule weight decay linearly to ramp down to zero. Tuned optimum weight decay for multiple model sizes d8, d12, d16, d20 and found a scaling law with optimum wd \propto 1/channels^2, including it as default into code. --weight_decay of base_train is now default on and configured optimally according to all of these experiments. Solid bump to val_bpb observed as a result of these changes. 2026-01-11 16:56:59 +00:00
Andrej Karpathy f5a0ea4d3f take out these gitignore dirs 2026-01-08 18:18:42 +00:00
Andrej Karpathy 4ddc803797 fix adamw slight bug. this chunk was copy pasted originally from modded-nanogpt, which still seems to have the bug 2026-01-08 18:18:42 +00:00
Andrej Karpathy 061f83c152 delete grad_clip. appears to not be necessary at all. not only was it buggy because the clipping happened per gpu before grad synchronization, but it costs ~2% MFU, and it also doesn't even help. I tried deleting it a while ago and back then it did help. So I'm guessing that some hyperparameter tuning obviated the reason for it since then 2026-01-08 02:16:50 +00:00
Andrej Karpathy e8c30c3b19 add notebook used for scaling laws analysis 2026-01-07 22:28:53 +00:00
Andrej Karpathy 3af4dcf6ee also add scaling_laws.sh script if it's a useful reference 2026-01-07 22:25:13 +00:00
Andrej Karpathy 4cc605b940 quick pointer to miniseries post in readme for now 2026-01-07 22:14:21 +00:00
Andrej Karpathy ccf4b7f9bf nudge hyperparameters of the base script with the results of the sweeps and miniseries. vocab size down to 32K. D:N ratio from 20 to 8. add miniseries script 2026-01-07 22:11:59 +00:00
Andrej Karpathy ae0bf52529 tune hyperparameters based on overnight sweeps. warmdown_ratio is the biggest free win, increasing 0.2 -> 0.4, and embedding lr can be larger bumping 0.2 -> 0.3 2026-01-05 18:57:46 +00:00
Andrej Karpathy eec0c79563 also add matplotlib dep so that we can have jupyter notebooks 2026-01-05 18:41:09 +00:00
Andrej Karpathy 54e59c38ad add notebook on deriving the CORE estimates for the GPT-3 miniseries. 2026-01-05 18:40:28 +00:00
Andrej Karpathy 9d4c9b786d many small fixes to base_train: reporting ETA, allowing some additional kwarg flexibility, making sure we don't crash when e.g. depth = 11 - we now calculate the closest num_heads that works 2026-01-05 00:38:09 +00:00
Andrej Karpathy 962b6bfba3 alright add transformers as a dep of the repo because it should be easy to evaluate the CORE score of HF models. Not super happy about it but i tried it and the uv.lock doesn't get bloated as much as i expected 2026-01-04 20:37:28 +00:00
Andrej Karpathy ed2082fbc4 sane secrets management 2026-01-04 19:29:22 +00:00
Andrej Karpathy eb7bbc1b66 delete the configurator in favor of argparse and clean up a lot of kwarg details to make them more consistent across all scripts 2026-01-04 19:14:23 +00:00
Andrej Karpathy 507d54224a fix small bug where this would break if git stage has deleted files 2026-01-04 19:11:43 +00:00
Andrej Karpathy 9c60dfb64c bump nanochat to use the latest stable pytorch that is 2.9.1 . Run e.g. to re-update your local environment if you git pull 2026-01-04 18:36:36 +00:00
Andrej KarpathyandClaude Opus 4.5 be56d29b87 simplify redundant if/elif in bloat metrics 
🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-01-04 01:40:42 +00:00
Andrej KarpathyandClaude Opus 4.5 ee79f29fbd replace files-to-prompt with git ls-files for bloat metrics 
files-to-prompt was including untracked files (knowledge/, dev scripts, etc.) which inflated the bloat metrics. now we use git ls-files to only count tracked source files, which is more accurate and removes an external dependency.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-01-04 01:38:15 +00:00
Andrej Karpathy da8b7ea4cb also delete the rustbpe test code, this now lives in rustbpe repo that is separate 2026-01-04 01:23:34 +00:00
Andrej Karpathy aa42f40e66 delete the inline rustbpe project. it was ugly to have a project within project and rustbpe is now nicely a separate repo on my github karpathy/rustbpe and it's on pypi etc., so we just add it as a depedency to uv. i think it is appropriate that this is a separate repo because 1) it doesn't have too many knobs, other than the ones that are exposed - the regex pattern and vocab size and 2) all of its complexity is not algorithmic (it's equivalent to minbpe), instead it is efficiency-related, so it is ok to hide relatively speaking 2026-01-03 23:55:28 +00:00
Andrej Karpathy 48abd7d85f simplify, clarify and slightly tune model initialization. should be very slightly better possibly, but certainly a lot clearer 2026-01-01 21:15:09 +00:00
Andrej KarpathyandClaude Opus 4.5 8f979a8bda fix: sample first token independently for each row in multi-sample generation 
Previously, when generating multiple samples (num_samples > 1), the first
token after prefill was sampled once and broadcast to all rows, causing
all samples to start identically. Now the prefill logits are expanded to
num_samples and sampled independently for each row.

Also simplified the generation loop by moving the forward pass to the end
of the loop, eliminating the first_iteration flag and if/else branching.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-28 04:52:13 +00:00
Andrej KarpathyandClaude Opus 4.5 91d76cc690 Replace speedup assertion with warning in batch_encode test 
Performance varies by machine and load, making hard assertions flaky.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-28 04:10:49 +00:00
Andrej 7a8769a40c Merge pull request #383 from barisozmen/master 
3x faster rust encode (`batch_encode`) (12 LoC + 2 tests)
 2025-12-27 20:06:57 -08:00
Andrej 088726aa7d clean up model_tag handling across scripts a bit more. 2025-12-27 20:01:09 -08:00
Andrej Karpathy 2874eda59a update to new os env var to get rid of deprecation warning 2025-12-28 03:32:46 +00:00
Andrej Karpathy e1770a3061 remove spurious cast, gets compiled away anyway but it's confusing people 2025-12-27 23:07:48 +00:00
Andrej Karpathy 49389ecaa8 fix tf32 warning for deprecated api use 2025-12-27 22:03:06 +00:00
Andrej bc51da8bac pad vocab size to 64 for DDP optimizers and efficiency 2025-12-23 09:13:31 -08:00
Andrej d5759400f9 fixing two typos in comments 2025-12-08 20:03:08 -08:00
Andrej e72c3299df fix random.seed() footgun bug for SpellingBee data generation 2025-12-08 19:58:45 -08:00
Andrej 7931e0903a rename checkpoint_dir to checkpoints_dir for consistency. 2025-12-08 18:32:12 -08:00
Andrej 849d95ae1f remove unnecessary check to make the logic in CausalSelfAttention.forward() clearer 2025-12-08 18:30:37 -08:00
Andrej 39cccc527f small bugfix make mid_train script work even with a tiny number of iterations 2025-12-08 18:27:32 -08:00
AndrejandSofie Van Landeghem 8b1cecaa95 Apply suggestion from @svlandeg for nicer looking comparison 
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
 2025-12-08 18:27:06 -08:00
Andrej 58f3e84e01 clean up train/val loader in sft for consistency with mid/base 2025-12-08 18:23:57 -08:00
Andrej 1b2a675c88 Improve KV cache code readability 2025-12-08 18:19:05 -08:00
Andrej d75e6ed711 Fix script comment to reference correct file 2025-12-08 18:16:42 -08:00
Andrej 72a7cf2bc4 Fix distributed Parquet dataloader resume for multi-epoch training 2025-12-08 18:15:02 -08:00
Andrej Karpathy bffdb2ef91 group common code to make things neater in gpt logit computation 2025-12-09 02:01:05 +00:00
Andrej cbf30c842c apply float32 cast before logits softcapping so the tanh is in fp32. torch compile fuses this correctly with no extra memory costs. 2025-12-08 14:17:43 -08:00
Andrej Karpathy 90442de35f fix bug where any rank has to be able to create checkpoint_dir if saving optim 2025-12-08 20:45:19 +00:00
Andrej 2fd0440355 fix: missing val_bpb on resume 2025-12-08 12:35:08 -08:00