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| import os | |
| import base64 | |
| import tempfile | |
| from io import BytesIO | |
| import torch | |
| import gradio as gr | |
| from PIL import Image | |
| from PyPDF2 import PdfReader | |
| from ebooklib import epub | |
| from pdf2image import convert_from_path | |
| from transformers import AutoProcessor, Qwen2VLForConditionalGeneration | |
| from olmocr.data.renderpdf import render_pdf_to_base64png | |
| from olmocr.prompts import build_finetuning_prompt | |
| from olmocr.prompts.anchor import get_anchor_text | |
| # Set Hugging Face and Torch cache to a guaranteed-writable location | |
| cache_dir = "/tmp/huggingface_cache" | |
| os.environ["HF_HOME"] = cache_dir | |
| os.environ["TORCH_HOME"] = cache_dir | |
| os.makedirs(cache_dir, exist_ok=True) | |
| # Load model and processor | |
| device = torch.device("cuda" if torch.cuda.is_available() else "cpu") | |
| model = Qwen2VLForConditionalGeneration.from_pretrained( | |
| "allenai/olmOCR-7B-0225-preview", | |
| torch_dtype=torch.bfloat16 if torch.cuda.is_available() else torch.float32 | |
| ).eval().to(device) | |
| processor = AutoProcessor.from_pretrained("Qwen/Qwen2-VL-7B-Instruct") | |
| def ocr_page(pdf_path, page_num): | |
| image_b64 = render_pdf_to_base64png(pdf_path, page_num + 1, target_longest_image_dim=1024) | |
| anchor_text = get_anchor_text(pdf_path, page_num + 1, pdf_engine="pdfreport", target_length=4000) | |
| prompt = build_finetuning_prompt(anchor_text) | |
| messages = [{ | |
| "role": "user", | |
| "content": [ | |
| {"type": "text", "text": prompt}, | |
| {"type": "image_url", "image_url": {"url": f"data:image/png;base64,{image_b64}"}} | |
| ], | |
| }] | |
| prompt_text = processor.apply_chat_template(messages, tokenize=False, add_generation_prompt=True) | |
| main_image = Image.open(BytesIO(base64.b64decode(image_b64))) | |
| inputs = processor(text=[prompt_text], images=[main_image], return_tensors="pt", padding=True) | |
| inputs = {k: v.to(device) for k, v in inputs.items()} | |
| with torch.no_grad(): | |
| outputs = model.generate( | |
| **inputs, | |
| temperature=0.8, | |
| max_new_tokens=1024, | |
| do_sample=True, | |
| ) | |
| prompt_len = inputs["input_ids"].shape[1] | |
| new_tokens = outputs[:, prompt_len:] | |
| decoded = processor.tokenizer.batch_decode(new_tokens, skip_special_tokens=True) | |
| return decoded[0] if decoded else "" | |
| def create_epub_from_text(text, output_path, title, author, language, cover_image): | |
| book = epub.EpubBook() | |
| # Set metadata | |
| book.set_title(title) | |
| book.set_language(language) | |
| book.add_author(author) | |
| # Add cover image | |
| with open(cover_image, "rb") as cover_file: | |
| cover_data = cover_file.read() | |
| cover_item = epub.EpubItem(uid="cover", file_name="cover.jpg", media_type="image/jpeg", content=cover_data) | |
| book.add_item(cover_item) | |
| # Create a chapter for the content | |
| chapter = epub.EpubHtml(title="Content", file_name="content.xhtml", lang=language) | |
| chapter.set_content(f"<html><body><h1>{title}</h1><p>{text}</p></body></html>") | |
| book.add_item(chapter) | |
| # Define Table of Contents (TOC) | |
| book.toc = (epub.Link("content.xhtml", "Content", "content"),) | |
| # Add default NCX and OPF files | |
| book.add_item(epub.EpubNav()) | |
| # Write the EPUB file | |
| epub.write_epub(output_path, book) | |
| def convert_pdf_to_epub(pdf_file, title, author, language): | |
| # Save the uploaded file to a temporary path | |
| tmp_pdf_path = "/tmp/uploaded.pdf" | |
| with open(tmp_pdf_path, "wb") as f: | |
| f.write(pdf_file.read()) # This ensures the file isn't empty | |
| # Now it's safe to read it | |
| reader = PdfReader(tmp_pdf_path) | |
| # Extract the first page for the cover (if needed) | |
| first_page = reader.pages[0] | |
| cover_path = "/tmp/cover.jpg" | |
| images = convert_from_path(tmp_pdf_path, first_page=1, last_page=1) | |
| images[0].save(cover_path, "JPEG") | |
| # Run OCR and get text from olmocr | |
| ocr_text = olmocr.process(tmp_pdf_path) | |
| # Use metadata | |
| epub_path = "/tmp/output.epub" | |
| create_epub_from_text( | |
| text=ocr_text, | |
| output_path=epub_path, | |
| title=title, | |
| author=author, | |
| language=language, | |
| cover_image=cover_path | |
| ) | |
| return epub_path, cover_path | |
| def interface_fn(pdf, title, author, language): | |
| epub_path, _ = convert_pdf_to_epub(pdf, title, author, language) | |
| return epub_path | |
| demo = gr.Interface( | |
| fn=interface_fn, | |
| inputs=[ | |
| gr.File(label="Upload PDF", file_types=[".pdf"]), | |
| gr.Textbox(label="EPUB Title", placeholder="e.g. Understanding AI"), | |
| gr.Textbox(label="Author", placeholder="e.g. Allen AI"), | |
| gr.Textbox(label="Language", placeholder="e.g. en", value="en"), | |
| ], | |
| outputs=gr.File(label="Download EPUB"), | |
| title="PDF to EPUB Converter (olmOCR)", | |
| description="Upload a PDF to convert it into a structured EPUB. The first page is used as the cover. OCR is performed with the olmOCR model.", | |
| allow_flagging="never", | |
| ) | |
| if __name__ == "__main__": | |
| demo.launch(share=True) | |