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import cv2
import gradio as gr
import numpy as np
import torch
from paddleocr import PaddleOCR
from PIL import Image
from transformers import AutoTokenizer, LayoutLMForQuestionAnswering
from transformers.pipelines.document_question_answering import apply_tesseract
model_tag = "impira/layoutlm-document-qa"
MODEL = LayoutLMForQuestionAnswering.from_pretrained(model_tag).eval()
TOKENIZER = AutoTokenizer.from_pretrained(model_tag)
OCR = PaddleOCR(
lang="en",
det_limit_side_len=10_000,
det_db_score_mode="slow",
)
PADDLE_OCR_LABEL = "PaddleOCR (en)"
TESSERACT_LABEL = "Tesseract (HF default)"
def predict(image: Image.Image, question: str, ocr_engine: str):
image_np = np.array(image)
if ocr_engine == PADDLE_OCR_LABEL:
ocr_result = OCR.ocr(image_np, cls=False)[0]
words = [x[1][0] for x in ocr_result]
boxes = np.asarray([x[0] for x in ocr_result]) # (n_boxes, 4, 2)
for box in boxes:
cv2.polylines(image_np, [box.reshape(-1, 1, 2).astype(int)], True, (0, 255, 255), 3)
x1 = boxes[:, :, 0].min(1) * 1000 / image.width
y1 = boxes[:, :, 1].min(1) * 1000 / image.height
x2 = boxes[:, :, 0].max(1) * 1000 / image.width
y2 = boxes[:, :, 1].max(1) * 1000 / image.height
# (n_boxes, 4) in xyxy format
boxes = np.stack([x1, y1, x2, y2], axis=1).astype(int)
elif ocr_engine == TESSERACT_LABEL:
words, boxes = apply_tesseract(image, None, "")
for x1, y1, x2, y2 in boxes:
x1 = int(x1 * image.width / 1000)
y1 = int(y1 * image.height / 1000)
x2 = int(x2 * image.width / 1000)
y2 = int(y2 * image.height / 1000)
cv2.rectangle(image_np, (x1, y1), (x2, y2), (0, 255, 255), 3)
else:
raise ValueError(f"Unsupported ocr_engine={ocr_engine}")
token_ids = TOKENIZER(question)["input_ids"]
token_boxes = [[0] * 4] * (len(token_ids) - 1) + [[1000] * 4]
n_question_tokens = len(token_ids)
token_ids.append(TOKENIZER.sep_token_id)
token_boxes.append([1000] * 4)
for word, box in zip(words, boxes):
new_ids = TOKENIZER(word, add_special_tokens=False)["input_ids"]
token_ids.extend(new_ids)
token_boxes.extend([box] * len(new_ids))
token_ids.append(TOKENIZER.sep_token_id)
token_boxes.append([1000] * 4)
with torch.inference_mode():
outputs = MODEL(
input_ids=torch.tensor(token_ids).unsqueeze(0),
bbox=torch.tensor(token_boxes).unsqueeze(0),
)
start_scores = outputs.start_logits.squeeze(0).softmax(-1)[n_question_tokens:]
end_scores = outputs.end_logits.squeeze(0).softmax(-1)[n_question_tokens:]
span_scores = start_scores.view(-1, 1) * end_scores.view(1, -1)
span_scores = torch.triu(span_scores) # don't allow start < end
score, indices = span_scores.flatten().max(-1)
start_idx = n_question_tokens + indices // span_scores.shape[1]
end_idx = n_question_tokens + indices % span_scores.shape[1]
answer = TOKENIZER.decode(token_ids[start_idx : end_idx + 1])
return answer, score, image_np
gr.Interface(
fn=predict,
inputs=[
gr.Image(type="pil"),
"text",
gr.Radio([PADDLE_OCR_LABEL, TESSERACT_LABEL]),
],
outputs=[
gr.Textbox(label="Answer"),
gr.Number(label="Score"),
gr.Image(label="OCR results"),
],
examples=[
["example_01.jpg", "When did the sample take place?", PADDLE_OCR_LABEL],
["example_02.jpg", "What is the ID number?", PADDLE_OCR_LABEL],
],
).launch(server_name="0.0.0.0", server_port=7860)
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