[BUG] TokenChunker Batch_chunking gives wrong end_index

[CharlesMoslonka]

Describe the bug

When using the chunk_batch() method, the resulting Chunks have a wrong end.index. The indexes seem to be counted in token units instead of string characters unit. This does not happen when using the single .chunk() method.

To Reproduce

Suppose that text_ds is a list of str that contains the texts you want to chunk.

chunker = TokenChunker(
    tokenizer=tokenizer, 
    chunk_size=300,
    chunk_overlap=20,
)

chunks = chunker.chunk_batch(text_ds)  
print(chunks[0][0].end_index)

this prints 300 or whatever chunk_size is.

Expected behavior

chunks[0][0].end_index should return a greater int value.

Additional context

I could not check for other chunkers, I have the same issue as #73 . I tried to look in the code, maybe it originates from the _process_batch method of the TokenChunker class ? I'll try to go deeper if I have time.

Anyway, thanks for your time and for the great package !
Cheers !

[bhavnicksm]

Hey @CharlesMoslonka!

Thanks for opening an issue and the kind words 😊

I understand the issue you are seeing, and I'll look into reproducing it so as to add a patch for it to Chonkie, at the earliest. Thanks to the detailed reproduction steps, I should be able to do that quickly.

Will update regarding the progress on this bug here,

Thanks! ☺️