---
license: mit
library_name: transformers
tags:
- tokenizers
---

# Tiktoken cl100k_base/gpt4 Tokenizer

## Convert script
modify from https://gist.github.com/xenova/a452a6474428de0182b17605a98631ee

## Example usage:
```py
import transformers

tokenizer = transformers.AutoTokenizer.from_pretrained("DWDMaiMai/tiktoken_cl100k_base")
assert [15339, 1917, 0] == tokenizer.encode("hello world!")

messages = [
    {"role": "user", "content": "Hello, how are you?"},
    {"role": "assistant", "content": "I'm doing great. How can I help you today?"},
    {"role": "user", "content": "I'd like to show off how chat templating works!"},
]
assert """<|im_start|>user
Hello, how are you?<|im_end|>
<|im_start|>assistant
I'm doing great. How can I help you today?<|im_end|>
<|im_start|>user
I'd like to show off how chat templating works!<|im_end|>
<|im_start|>assistant
""" == tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
)
```

## Relevant