app.py

# -*- coding: utf-8 -*-
"""DocAI_DeploymentGradio.ipynb

Automatically generated by Colaboratory.

Original file is located at
    https://colab.research.google.com/drive/1USSEj7nHh2n2hUhTJTC0Iwhj6mSR7-mD
"""

import os
os.system('pip3 install torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/cpu')

os.system('pip install pyyaml==5.1')

os.system('pip install -q git+https://github.com/huggingface/transformers.git')

os.system('pip install -q datasets seqeval')

os.system('pip install torch==1.8.0+cu101 torchvision==0.9.0+cu101 -f https://download.pytorch.org/whl/torch_stable.html')
os.system('pip install -q detectron2 -f https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.8/index.html')
os.system('pip install -q pytesseract')

!pip install gradio

!pip install -q git+https://github.com/huggingface/transformers.git

!pip install h5py

!pip install -q datasets seqeval

import gradio as gr

import numpy as np
import tensorflow as tf

import torch
import json

from datasets.features import ClassLabel
from transformers import AutoProcessor

from datasets import Features, Sequence, ClassLabel, Value, Array2D, Array3D
from datasets import load_dataset # this dataset uses the new Image feature :) 

from transformers import LayoutLMv3Processor, LayoutLMv3ForTokenClassification

#import cv2
from PIL import Image, ImageDraw, ImageFont

processor = LayoutLMv3Processor.from_pretrained("microsoft/layoutlmv3-base",apply_ocr = True)

model = LayoutLMv3ForTokenClassification.from_pretrained("microsoft/layoutlmv3-base")

dataset = load_dataset("nielsr/funsd-layoutlmv3")

example = dataset["test"][0]
example["image"].save("example1.png")

example1 = dataset["test"][1]
example1["image"].save("example2.png")

example2 = dataset["test"][2]
example2["image"].save("example3.png")

#example2["image"]

labels = dataset["test"].features['ner_tags'].feature.names

words, boxes, ner_tags = example["tokens"], example["bboxes"], example["ner_tags"]

features = dataset["test"].features

column_names = dataset["test"].column_names

image_column_name = "image"
text_column_name = "tokens"
boxes_column_name = "bboxes"
label_column_name = "ner_tags"

# In the event the labels are not a `Sequence[ClassLabel]`, we will need to go through the dataset to get the
# unique labels.
def get_label_list(labels):
    unique_labels = set()
    for label in labels:
        unique_labels = unique_labels | set(label)
    label_list = list(unique_labels)
    label_list.sort()
    return label_list

if isinstance(features[label_column_name].feature, ClassLabel):
    label_list = features[label_column_name].feature.names
    # No need to convert the labels since they are already ints.
    id2label = {k: v for k,v in enumerate(label_list)}
    label2id = {v: k for k,v in enumerate(label_list)}
else:
    label_list = get_label_list(dataset["train"][label_column_name])
    id2label = {k: v for k,v in enumerate(label_list)}
    label2id = {v: k for k,v in enumerate(label_list)}
num_labels = len(label_list)

def get_label_list(labels):
    unique_labels = set()
    for label in labels:
        unique_labels = unique_labels | set(label)
    label_list = list(unique_labels)
    label_list.sort()
    return label_list

label2color = {'question':'blue', 'answer':'green', 'header':'orange', 'other':'violet'}

def unnormalize_box(bbox, width, height):
     return [
         width * (bbox[0] / 1000),
         height * (bbox[1] / 1000),
         width * (bbox[2] / 1000),
         height * (bbox[3] / 1000),
     ]

#def prepare_examples(examples):
#  images = examples[image_column_name]
#  words = examples[text_column_name]
#  boxes = examples[boxes_column_name]
#  word_labels = examples[label_column_name]

#  encoding = processor(images, words, boxes=boxes, word_labels=word_labels,
 #                      truncation=True, padding="max_length")

 # return encoding

# we need to define custom features for `set_format` (used later on) to work properly
features = Features({
    'pixel_values': Array3D(dtype="float32", shape=(3, 224, 224)),
    'input_ids': Sequence(feature=Value(dtype='int64')),
    'attention_mask': Sequence(Value(dtype='int64')),
    'bbox': Array2D(dtype="int64", shape=(512, 4)),
    'labels': Sequence(feature=Value(dtype='int64')),
})

def process_image(image):
    width, height = image.size

    # encode
    encoding = processor(image, truncation=True, return_offsets_mapping=True, return_tensors="pt")
    offset_mapping = encoding.pop('offset_mapping')

    # forward pass
    outputs = model(**encoding)

    # get predictions
    predictions = outputs.logits.argmax(-1).squeeze().tolist()
    token_boxes = encoding.bbox.squeeze().tolist()

    # only keep non-subword predictions
    is_subword = np.array(offset_mapping.squeeze().tolist())[:,0] != 0
    true_predictions = [id2label[pred] for idx, pred in enumerate(predictions) if not is_subword[idx]]
    true_boxes = [unnormalize_box(box, width, height) for idx, box in enumerate(token_boxes) if not is_subword[idx]]

    # draw predictions over the image
    draw = ImageDraw.Draw(image)
    font = ImageFont.load_default()

    def iob_to_label(label):
        label = label[2:]
        if not label:
            return 'other'
    return label

    label2color = {'question':'blue', 'answer':'green', 'header':'orange', 'other':'violet'}
    for prediction, box in zip(true_predictions, true_boxes):
        predicted_label = iob_to_label(prediction) #.lower()
        draw.rectangle(box, outline=label2color[predicted_label])
        draw.text((box[0]+10, box[1]-10), text=predicted_label, fill=label2color[predicted_label], font=font)
    
    return image

#def process_image(image):

    print(type(image))
    width, height = image.size

    image = example["image"]
    words = example["tokens"]
    boxes = example["bboxes"]
    word_labels = example["ner_tags"]

    for k,v in encoding.items():
        print(k,v.shape)

    # encode

    encoding = processor(image, truncation=True,boxes=boxes, word_labels=word_labels,return_offsets_mapping=True, return_tensors="pt")
    offset_mapping = encoding.pop('offset_mapping')

    

    # forward pass
    with torch.no_grad():
        outputs = model(**encoding)

    # get predictions

    # We take the highest score for each token, using argmax. 
    # This serves as the predicted label for each token.
    logits = outputs.logits
    #logits.shape
    predictions = logits.argmax(-1).squeeze().tolist()

    labels = encoding.labels.squeeze().tolist()

    token_boxes = encoding.bbox.squeeze().tolist()
    width, height = image.size

        
    # only keep non-subword predictions
    is_subword = np.array(offset_mapping.squeeze().tolist())[:,0] != 0
    true_predictions = [id2label[pred] for idx, pred in enumerate(predictions) if not is_subword[idx]]
    true_boxes = [unnormalize_box(box, width, height) for idx, box in enumerate(token_boxes) if not is_subword[idx]]

    # draw predictions over the image
    draw = ImageDraw.Draw(image)
    font = ImageFont.load_default()
    for prediction, box in zip(true_predictions, true_boxes):
        predicted_label = id2label(prediction)
        draw.rectangle(box, outline=label2color[predicted_label])
        draw.text((box[0]+10, box[1]-10), text=predicted_label, fill=label2color[predicted_label], font=font)
    
    return image

title = "DocumentAI - Extraction using LayoutLMv3 model"
description = "Extraction of Form or Invoice Extraction - We use Microsoft's LayoutLMv3 trained on Invoice Dataset to predict the Biller Name, Biller Address, Biller post_code, Due_date, GST, Invoice_date, Invoice_number, Subtotal and Total. To use it, simply upload an image or use the example image below. Results will show up in a few seconds."

article="<b>References</b><br>[1] Y. Xu et al., “LayoutLMv3: Pre-training for Document AI with Unified Text and Image Masking.” 2022. <a href='https://arxiv.org/abs/2204.08387'>Paper Link</a><br>[2]  <a href='https://github.com/NielsRogge/Transformers-Tutorials/tree/master/LayoutLMv3'>LayoutLMv3 training and inference</a>" 

examples =[['example1.png'],['example2.png'],['example3.png']]

css = """.output_image, .input_image {height: 600px !important}"""

iface = gr.Interface(fn=process_image, 
                     inputs=gr.inputs.Image(type="pil"), 
                     outputs=gr.outputs.Image(type="pil", label="annotated image"),
                     title=title,
                     description=description,
                     article=article,
                     examples=examples,
                     css=css,
                     analytics_enabled = True, enable_queue=True
                     )

#iface.launch(inline=False, share=False, debug=False)

iface.launch(inline=False)