| # BPE-32k SlimPajama-3M | |
| BPE tokeniser with vocabulary size 32768, trained on the first 3 million examples in [SlimPajama-627B](https://huggingface.co/datasets/cerebras/SlimPajama-627B). | |
| ## Tokeniser details | |
| BPE trainer implementation: | |
| - Back-end: [SentencePiece](https://github.com/google/sentencepiece)'s `SentencePieceTrainer`. | |
| - Front-end: [TkTkT](https://github.com/bauwenst/TkTkT)'s [`BPEVocabulariser`](https://github.com/bauwenst/TkTkT/blob/341ae85980a5a9a2d60dbdc88645f8828b5c3a06/src/tktkt/models/bpe/vocabularisation.py#L210) | |
| Preprocessor: | |
| - During training: TkTkT's [`SentencePiecePreprocessor`](https://github.com/bauwenst/TkTkT/blob/341ae85980a5a9a2d60dbdc88645f8828b5c3a06/src/tktkt/preparation/instances.py#L181) | |
| - During inference: TkTkT's [`ModernEnglishPreprocessor`](https://github.com/bauwenst/TkTkT/blob/341ae85980a5a9a2d60dbdc88645f8828b5c3a06/src/tktkt/preparation/instances.py#L105) | |
| 1. NFKC normalisation | |
| 2. Punctuation splitter, whitespace splitter, English contraction splitter | |
| 3. GPT-2's pseudo-byte mapping | |
| 4. Start-of-word marker `Ġ` | |
| 5. Digit and hyphen isolation | |
| ## Training details | |
| **Time:** 3h10m | |
| - Preprocessing and counting the 3M corpus: 2h45m | |
| - BPE merges: 25m | |
| **Memory:** 33.42 GiB peak usage. | |
| **Data sizes:** | |
| - Examples considered: 3 000 000 | |
| - Examples used: 2 609 893 (390 107 examples dropped for being > 8192 characters). | |
| - Characters counted: 6 685 212 190 | |
| - Unique words after whitespace splitting: 9 254 839 | |