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axolotl/docs/dataset-formats/tokenized.qmd
Alpay Ariyak ab461d83c4 Fix documentation for pre-tokenized dataset (#1894)
It's currently asking to not add BOS and EOS, stating that Axolotl adds them, but this is not true
2024-09-05 23:11:31 +09:00

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---
title: Custom Pre-Tokenized Dataset
description: How to use a custom pre-tokenized dataset.
order: 5
---
- Pass an empty `type:` in your axolotl config.
- Columns in Dataset must be exactly `input_ids`, `attention_mask`, `labels`
- To indicate that a token should be ignored during training, set its corresponding label to `-100`.
- You must add BOS and EOS, and make sure that you are training on EOS by not setting its label to -100.
- For pretraining, do not truncate/pad documents to the context window length.
- For instruction training, documents must be truncated/padded as desired.
Sample config:
```{.yaml filename="config.yml"}
datasets:
- path: /path/to/your/file.jsonl
ds_type: json
type:
```
Sample jsonl:
```jsonl
{"input_ids":[271,299,99],"attention_mask":[1,1,1],"labels":[271,-100,99]}
{"input_ids":[87,227,8383,12],"attention_mask":[1,1,1,1],"labels":[87,227,8383,12]}
```