import os
import gradio as gr
import re
import string
from operator import itemgetter
import collections
import pypdf
from pypdf import PdfReader
from pypdf.errors import PdfReadError
import pdf2image
from pdf2image import convert_from_path
import langdetect
from langdetect import detect_langs
import pandas as pd
import numpy as np
import random
import tempfile
import itertools
from matplotlib import font_manager
from PIL import Image, ImageDraw, ImageFont
import cv2
## files
import sys
sys.path.insert(0, 'files/')
import functions
from functions import *
# update pip
os.system('python -m pip install --upgrade pip')
# model
from transformers import AutoTokenizer, AutoModelForTokenClassification
import torch
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
model_id = "NiamaLynn/lilt-roberta-DocLayNet-base_lines_ml256-v1"
tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForTokenClassification.from_pretrained(model_id);
model.to(device);
# APP outputs
def app_outputs(uploaded_pdf):
filename, msg, images = pdf_to_images(uploaded_pdf)
num_images = len(images)
path = os.path.dirname(__file__)
if not msg.startswith("Error with the PDF"):
# Extraction of image data (text and bounding boxes)
dataset, lines, row_indexes, par_boxes, line_boxes = extraction_data_from_image(images)
# prepare our data in the format of the model
encoded_dataset = dataset.map(prepare_inference_features, batched=True, batch_size=64, remove_columns=dataset.column_names)
custom_encoded_dataset = CustomDataset(encoded_dataset, tokenizer)
# Get predictions (token level)
outputs, images_ids_list, chunk_ids, input_ids, bboxes = predictions_token_level(images, custom_encoded_dataset)
# Get predictions (line level)
probs_bbox, bboxes_list_dict, input_ids_dict_dict, probs_dict_dict, df = predictions_line_level(dataset, outputs, images_ids_list, chunk_ids, input_ids, bboxes)
# Get labeled images with lines bounding boxes
images = get_labeled_images(dataset, images_ids_list, bboxes_list_dict, probs_dict_dict)
img_files = list()
# get image of PDF without bounding boxes
for i in range(num_images):
if filename != path+"/blank.png": img_file = f"img_{i}_" + filename.replace(".pdf", ".png")
else: img_file = filename.replace(".pdf", ".png")
if not os.path.exists(img_file):
os.makedirs(os.path.dirname(img_file))
images[i].save(img_file)
img_files.append(img_file)
if num_images < max_imgboxes:
img_files += [image_blank]*(max_imgboxes - num_images)
images += [Image.open(image_blank)]*(max_imgboxes - num_images)
for count in range(max_imgboxes - num_images):
df[num_images + count] = pd.DataFrame()
else:
img_files = img_files[:max_imgboxes]
images = images[:max_imgboxes]
df = dict(itertools.islice(df.items(), max_imgboxes))
csv_files = list()
for i in range(max_imgboxes):
csv_file = f"csv_{i}_" + filename.replace(".pdf", ".csv")
if not os.path.exists(csv_file):
os.makedirs(os.path.dirname(csv_file))
csv_files.append(gr.File(value=csv_file, visible=True)) # Create new File instances
df[i].to_csv(csv_file, encoding="utf-8", index=False)
else:
img_files, images, csv_files = [""]*max_imgboxes, [""]*max_imgboxes, [""]*max_imgboxes
img_files[0], img_files[1] = image_blank, image_blank
images[0], images[1] = Image.open(image_blank), Image.open(image_blank)
csv_file = "csv_wo_content.csv"
csv_files[0], csv_files[1] = gr.File.update(value=csv_file, visible=True), gr.File.update(value=csv_file, visible=True)
df, df_empty = dict(), pd.DataFrame()
df[0], df[1] = df_empty.to_csv(csv_file, encoding="utf-8", index=False), df_empty.to_csv(csv_file, encoding="utf-8", index=False)
return msg, img_files[0], img_files[1], images[0], images[1], csv_files[0], csv_files[1], df[0], df[1]
# gradio APP
with gr.Blocks(title="Application for document layout analysis at line level (v1 - LiLT base)", css=".gradio-container") as demo:
gr.HTML("""
Inference application for Documents layout analysis at line level (v1 - LiLT base)
LiLT (Language-Independent Layout Transformer) is a Document Understanding model that uses both layout and text in order to detect labels of bounding boxes. Combined with the model XML-RoBERTa base, this finetuned model has the capacity to understand any language. Finetuned on the dataset DocLayNet base, it can classifly any bounding box (and its OCR text) to 11 labels (Caption, Footnote, Formula, List-item, Page-footer, Page-header, Picture, Section-header, Table, Text, Title).
It relies on an external OCR engine to get words and bounding boxes from the document image. Thus, let's run in this APP an OCR engine (PyTesseract) to get the bounding boxes, then run LiLT (already fine-tuned on the dataset DocLayNet base at line level) on the individual tokens and then, visualize the result at line level!
It allows to get all pages of any PDF (of any language) with bounding boxes labeled at line level and the associated dataframes with labeled data (bounding boxes, texts, labels) :-)
However, the inference time per page can be high when running the model on CPU due to the number of line predictions to be made. Therefore, to avoid running this APP for too long, only the first 2 pages are processed by this APP
""")
with gr.Row():
pdf_file = gr.File(label="PDF")
with gr.Row():
submit_btn = gr.Button(f"Display first {max_imgboxes} labeled PDF pages")
reset_btn = gr.Button(value="Clear")
with gr.Row():
output_msg = gr.Textbox(label="Output message")
with gr.Row():
fileboxes = []
for num_page in range(max_imgboxes):
file_path = gr.File(visible=True, label=f"Image file of the PDF page n°{num_page}")
fileboxes.append(file_path)
with gr.Row():
imgboxes = []
for num_page in range(max_imgboxes):
img = gr.Image(type="pil", label=f"Image of the PDF page n°{num_page}")
imgboxes.append(img)
with gr.Row():
csvboxes = []
for num_page in range(max_imgboxes):
csv = gr.File(visible=True, label=f"CSV file at line level (page {num_page})")
csvboxes.append(csv)
with gr.Row():
dfboxes = []
for num_page in range(max_imgboxes):
df = gr.Dataframe(
headers=["bounding boxes", "texts", "labels"],
datatype=["str", "str", "str"],
col_count=(3, "fixed"),
visible=True,
label=f"Data of page {num_page}",
type="pandas",
wrap=True
)
dfboxes.append(df)
outputboxes = [output_msg] + fileboxes + imgboxes + csvboxes + dfboxes
submit_btn.click(app_outputs, inputs=[pdf_file], outputs=outputboxes)
reset_btn.click(
lambda: [pdf_file.update(value=None), output_msg.update(value=None)] + [filebox.update(value=None) for filebox in fileboxes] + [imgbox.update(value=None) for imgbox in imgboxes] + [csvbox.update(value=None) for csvbox in csvboxes] + [dfbox.update(value=None) for dfbox in dfboxes],
inputs=[],
outputs=[pdf_file, output_msg] + fileboxes + imgboxes + csvboxes + dfboxes,
)
gr.Examples(
[["files/example.pdf"]],
[pdf_file],
outputboxes,
fn=app_outputs,
cache_examples=True,
)
demo.launch()