Train BPE with fastBPE, and load to Huggingface Tokenizer.

Related tags

Text Data & NLPBPEer
Overview

BPEer

Train BPE with fastBPE, and load to Huggingface Tokenizer.

Description

The BPETrainer of Huggingface consumes a lot of memory when I am training on a large corpus (e.g. 50000 merges on 20GB corpus). And I got a memory error.

So I use fastBPE (implemented with C) instead, which returns a list of merge operations.

However, I still want to use the huggingface Tokenizer API. So I write a simple convertor for generating the json file for Huggingface Tokenizer.

Usage

Train BPE:

cd fastBPE
./fast learnbpe [merges, e.g. 50000] [train.txt] > allvocab

Convert to json:

python convertjs.py

Warning

This tokenizer does not indicate the start of a token.

E.g. BPE result for "I am" and "Iam" may be the same. Please split the sentence by space before you use it.

    words = "I am".split()
    for word in words:
        subs = tokenizer.tokenize(word)
        subs[0] = "
   
    "
    + subs[0]

This results in [" I", "am"] and [" I", " am"] for "Iam" and "I am".

Owner
Lizhuo
二律背反的双重人格
Lizhuo
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