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2.6 KiB
2.6 KiB
Transformers与Tiktonken的互操作性
在🤗 transformers中，当使用from_pretrained方法从Hub加载模型时，如果模型包含tiktoken格式的tokenizer.model文件，框架可以无缝支持tiktoken模型文件，并自动将其转换为我们的快速词符化器。
已知包含tiktoken.model文件发布的模型：
- gpt2
- llama3
使用示例
为了在transformers中正确加载tiktoken文件，请确保tiktoken.model文件是tiktoken格式的，并且会在加载from_pretrained时自动加载。以下展示如何从同一个文件中加载词符化器(tokenizer)和模型：
from transformers import AutoTokenizer
model_id = "meta-llama/Meta-Llama-3-8B-Instruct"
tokenizer = AutoTokenizer.from_pretrained(model_id, subfolder="original")
创建tiktoken词符化器(tokenizer)
tokenizer.model文件中不包含任何额外的词符(token)或模式字符串(pattern strings)的信息。如果这些信息很重要，需要将词符化器(tokenizer)转换为适用于[PreTrainedTokenizerFast]类的tokenizer.json格式。
使用tiktoken.get_encoding生成tokenizer.model文件，再使用[convert_tiktoken_to_fast]函数将其转换为tokenizer.json文件。
from transformers.integrations.tiktoken import convert_tiktoken_to_fast
from tiktoken import get_encoding
# You can load your custom encoding or the one provided by OpenAI
encoding = get_encoding("gpt2")
convert_tiktoken_to_fast(encoding, "config/save/dir")
生成的tokenizer.json文件将被保存到指定的目录，并且可以通过[PreTrainedTokenizerFast]类来加载。
tokenizer = PreTrainedTokenizerFast.from_pretrained("config/save/dir")