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import gradio as gr | |
import os | |
os.system('pip3 install torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/cpu') | |
os.system('sudo apt-get install tesseract-ocr') | |
os.system('pip install -q pytesseract') | |
import torch | |
from datasets import load_dataset, ClassLabel | |
from transformers import LayoutLMv3ForTokenClassification, LayoutLMv3Processor,LayoutLMv3FeatureExtractor | |
import pytesseract | |
import numpy as np | |
from PIL import ImageDraw, ImageFont | |
examples = [['./examples/example1.png'],['./examples/example2.png'],['./examples/example3.png']] | |
dataset = load_dataset("nielsr/cord-layoutlmv3")['train'] | |
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 | |
def convert_l2n_n2l(dataset): | |
features = dataset.features | |
label_column_name = "ner_tags" | |
label_list = features[label_column_name].feature.names | |
if isinstance(features[label_column_name].feature, ClassLabel): | |
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[label_column_name]) | |
id2label = {k:v for k,v in enumerate(label_list)} | |
label2id = {v:k for k,v in enumerate(label_list)} | |
return label_list, id2label, label2id, len(label_list) | |
def label_colour(label): | |
label2color = {'MENU.PRICE':'blue', 'MENU.NM':'green', 'other':'green','MENU.TOTAL_PRICE':'red'} | |
if label in label2color: | |
colour = label2color.get(label) | |
else: | |
colour = None | |
return colour | |
def iob_to_label(label): | |
label = label[2:] | |
if not label: | |
return 'other' | |
return label | |
def convert_results(words,tags): | |
ents = set() | |
completeword = "" | |
for word, tag in zip(words, tags): | |
if tag != "O": | |
ent_position, ent_type = tag.split("-") | |
if ent_position == "S": | |
ents.add((word,ent_type)) | |
else: | |
if ent_position == "B": | |
completeword = completeword+ " "+ word | |
elif ent_position == "I": | |
completeword= completeword+ " " + word | |
elif ent_position == "E": | |
completeword =completeword+" " + word | |
ents.add((completeword,ent_type)) | |
completeword= "" | |
return ents | |
def unnormalize_box(bbox, width, height): | |
return [ | |
width * (bbox[0] / 1000), | |
height * (bbox[1] / 1000), | |
width * (bbox[2] / 1000), | |
height * (bbox[3] / 1000), | |
] | |
def predict(image): | |
device = torch.device("cuda" if torch.cuda.is_available() else "cpu") | |
model = LayoutLMv3ForTokenClassification.from_pretrained("keldrenloy/layoutlmv3cordfinetuned").to(device) #add your model directory here | |
processor = LayoutLMv3Processor.from_pretrained("microsoft/layoutlmv3-base") | |
label_list,id2label,label2id, num_labels = convert_l2n_n2l(dataset) | |
width, height = image.size | |
encoding_inputs = processor(image,return_offsets_mapping=True, return_tensors="pt",truncation = True) | |
offset_mapping = encoding_inputs.pop('offset_mapping') | |
for k,v in encoding_inputs.items(): | |
encoding_inputs[k] = v.to(device) | |
with torch.no_grad(): | |
outputs = model(**encoding_inputs) | |
predictions = outputs.logits.argmax(-1).squeeze().tolist() | |
token_boxes = encoding_inputs.bbox.squeeze().tolist() | |
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]] | |
return true_boxes, true_predictions | |
def text_extraction(image): | |
feature_extractor = LayoutLMv3FeatureExtractor() | |
encoding = feature_extractor(image, return_tensors="pt") | |
return encoding['words'][0] | |
def image_render(image): | |
draw = ImageDraw.Draw(image) | |
font = ImageFont.load_default() | |
true_boxes,true_predictions = predict(image) | |
for prediction, box in zip(true_predictions, true_boxes): | |
predicted_label = iob_to_label(prediction) | |
draw.rectangle(box, outline=label_colour(predicted_label)) | |
draw.text((box[0]+10, box[1]-10), text=predicted_label, fill=label_colour(predicted_label), font=font) | |
words = text_extraction(image) | |
print(words) | |
extracted_words = convert_results(words,true_predictions) | |
return image,extracted_words | |
css = """.output_image, .input_image {height: 600px !important}""" | |
demo = gr.Interface(fn = image_render, | |
inputs = gr.inputs.Image(type="pil"), | |
outputs = [gr.outputs.Image(type="pil", label="annotated image"),'text'], | |
css = css, | |
examples = examples, | |
allow_flagging=True, | |
flagging_options=["incorrect", "correct"], | |
flagging_callback = gr.CSVLogger(), | |
flagging_dir = "flagged" | |
) | |
if __name__ == "__main__": | |
demo.launch() |