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metadata
license: apache-2.0
language:
  - en
pipeline_tag: image-to-text

Nougat-LaTeX-based

Nougat-LaTeX-based is fine-tuned from facebook/nougat-base with im2latex-100k to boost its proficiency in generating LaTeX code from images. Since the initial encoder input image size of nougat was unsuitable for equation image segments, leading to potential rescaling artifacts that degrades the generation quality of LaTeX code. To address this, Nougat-LaTeX-based adjusts the input resolution and uses an adaptive padding approach to ensure that equation image segments in the wild are resized to closely match the resolution of the training data.

Evaluation

Evaluated on an image-equation pair dataset collected from Wikipedia, arXiv, and im2latex-100k, curated by lukas-blecher

model token_acc ↑ normed edit distance ↓
pix2tex 0.5346 0.10312
pix2tex* 0.60 0.10
nougat-latex-based 0.623850 0.06180

pix2tex is a ResNet + ViT + Text Decoder architecture introduced in LaTeX-OCR.

pix2tex*: reported from LaTeX-OCR; pix2tex: my evaluation with the released checkpoint ; nougat-latex-based: evaluated on results generated with beam-search strategy.

Requirements 

pip install transformers >= 4.34.0

Uses 

import torch
from PIL import Image
from transformers import VisionEncoderDecoderModel
from transformers.models.nougat import NougatTokenizerFast

from nougat_latex import NougatLaTexProcessor
from nougat_latex.image_processing_nougat import NougatImageProcessor

device = "cuda" if torch.cuda.is_available() else "cpu"
# init model
model = VisionEncoderDecoderModel.from_pretrained("Norm/nougat-latex-base").to(device)

# init processor
tokenizer = NougatTokenizerFast.from_pretrained("Norm/nougat-latex-base")

image_processor = NougatImageProcessor.from_pretrained("Norm/nougat-latex-base")
latex_processor = NougatLaTexProcessor(image_processor=image_processor)

# run test
image = Image.open("path/to/latex/image.png")
if not image.mode == "RGB":
    image = image.convert('RGB')

pixel_values = latex_processor(image)

decoder_input_ids = tokenizer(tokenizer.bos_token, add_special_tokens=False,
                              return_tensors="pt").input_ids
with torch.no_grad():
    outputs = model.generate(
        pixel_values.to(device),
        decoder_input_ids=decoder_input_ids.to(device),
        max_length=model.decoder.config.max_length,
        early_stopping=True,
        pad_token_id=tokenizer.pad_token_id,
        eos_token_id=tokenizer.eos_token_id,
        use_cache=True,
        num_beams=5,
        bad_words_ids=[[tokenizer.unk_token_id]],
        return_dict_in_generate=True,
    )
sequence = tokenizer.batch_decode(outputs.sequences)[0]
sequence = sequence.replace(tokenizer.eos_token, "").replace(tokenizer.pad_token, "").replace(tokenizer.bos_token, "")
print(sequence)