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app.py

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+import base64
+import chromadb
+import gc
+import gradio as gr
+import io
+import numpy as np
+import os
+import pandas as pd
+import pymupdf
+from pypdf import PdfReader
+import spaces
+import torch
+from PIL import Image
+from chromadb.utils import embedding_functions
+from chromadb.utils.data_loaders import ImageLoader
+from doctr.io import DocumentFile
+from doctr.models import ocr_predictor
+from gradio.themes.utils import sizes
+from langchain import PromptTemplate
+from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain_community.llms import HuggingFaceEndpoint
+from transformers import LlavaNextForConditionalGeneration, LlavaNextProcessor
+from utils import *
+
+
+def result_to_text(result, as_text=False) -> str or list:
+    full_doc = []
+    for _, page in enumerate(result.pages, start=1):
+        text = ""
+        for block in page.blocks:
+            text += "\n\t"
+            for line in block.lines:
+                for word in line.words:
+                    text += word.value + " "
+
+        full_doc.append(clean_text(text) + "\n\n")
+
+    return "\n".join(full_doc) if as_text else full_doc
+
+
+ocr_model = ocr_predictor(
+    "db_resnet50",
+    "crnn_mobilenet_v3_large",
+    pretrained=True,
+    assume_straight_pages=True,
+)
+
+
+if torch.cuda.is_available():
+    processor = LlavaNextProcessor.from_pretrained("llava-hf/llava-v1.6-mistral-7b-hf")
+    vision_model = LlavaNextForConditionalGeneration.from_pretrained(
+        "llava-hf/llava-v1.6-mistral-7b-hf",
+        torch_dtype=torch.float16,
+        low_cpu_mem_usage=True,
+        load_in_4bit=True,
+    )
+
+
+@spaces.GPU()
+def get_image_description(image):
+    torch.cuda.empty_cache()
+    gc.collect()
+
+    # n = len(prompt)
+    prompt = "[INST] <image>\nDescribe the image in a sentence [/INST]"
+
+    inputs = processor(prompt, image, return_tensors="pt").to("cuda:0")
+    output = vision_model.generate(**inputs, max_new_tokens=100)
+    return processor.decode(output[0], skip_special_tokens=True)
+
+
+CSS = """
+#table_col {background-color: rgb(33, 41, 54);}
+"""
+
+
+# def get_vectordb(text, images, tables):
+def get_vectordb(text, images, img_doc_files):
+    client = chromadb.EphemeralClient()
+    loader = ImageLoader()
+    sentence_transformer_ef = embedding_functions.SentenceTransformerEmbeddingFunction(
+        model_name="multi-qa-mpnet-base-dot-v1"
+    )
+    if "text_db" in [i.name for i in client.list_collections()]:
+        client.delete_collection("text_db")
+    if "image_db" in [i.name for i in client.list_collections()]:
+        client.delete_collection("image_db")
+
+    text_collection = client.get_or_create_collection(
+        name="text_db",
+        embedding_function=sentence_transformer_ef,
+        data_loader=loader,
+    )
+    image_collection = client.get_or_create_collection(
+        name="image_db",
+        embedding_function=sentence_transformer_ef,
+        data_loader=loader,
+        metadata={"hnsw:space": "cosine"},
+    )
+    descs = []
+    for i in range(len(images)):
+        try:
+            descs.append(img_doc_files[i] + "\n" + get_image_description(images[i]))
+        except:
+            descs.append("Could not generate image description due to some error")
+        print(descs[-1])
+        print()
+
+    # image_descriptions = get_image_descriptions(images)
+    image_dict = [{"image": image_to_bytes(img)} for img in images]
+
+    if len(images) > 0:
+        image_collection.add(
+            ids=[str(i) for i in range(len(images))],
+            documents=descs,
+            metadatas=image_dict,
+        )
+
+    splitter = RecursiveCharacterTextSplitter(
+        chunk_size=500,
+        chunk_overlap=10,
+    )
+
+    if len(text.replace(" ", "").replace("\n", "")) == 0:
+        gr.Error("No text found in documents")
+    else:
+        docs = splitter.create_documents([text])
+        doc_texts = [i.page_content for i in docs]
+        text_collection.add(
+            ids=[str(i) for i in list(range(len(doc_texts)))], documents=doc_texts
+        )
+    return client
+
+
+def extract_only_text(reader):
+    text = ""
+    for _, page in enumerate(reader.pages):
+        text = page.extract_text()
+    return text.strip()
+
+
+def extract_data_from_pdfs(
+    docs, session, include_images, do_ocr, progress=gr.Progress()
+):
+    if len(docs) == 0:
+        raise gr.Error("No documents to process")
+    progress(0, "Extracting Images")
+
+    # images = extract_images(docs)
+
+    progress(0.25, "Extracting Text")
+
+    all_text = ""
+
+    images = []
+    img_docs = []
+    for doc in docs:
+        if do_ocr == "Get Text With OCR":
+            pdf_doc = DocumentFile.from_pdf(doc)
+            result = ocr_model(pdf_doc)
+            all_text += result_to_text(result, as_text=True) + "\n\n"
+        else:
+            reader = PdfReader(doc)
+            all_text += extract_only_text(reader) + "\n\n"
+
+        if include_images == "Include Images":
+            imgs = extract_images([doc])
+            images.extend(imgs)
+            img_docs.extend([doc.split("/")[-1] for _ in range(len(imgs))])
+
+    progress(
+        0.6, "Generating image descriptions and inserting everything into vectorDB"
+    )
+    vectordb = get_vectordb(all_text, images, img_docs)
+
+    progress(1, "Completed")
+    session["processed"] = True
+    return (
+        vectordb,
+        session,
+        gr.Row(visible=True),
+        all_text[:2000] + "...",
+        # display,
+        images[:2],
+        "<h1 style='text-align: center'>Completed<h1>",
+        # image_descriptions
+    )
+
+
+sentence_transformer_ef = embedding_functions.SentenceTransformerEmbeddingFunction(
+    model_name="multi-qa-mpnet-base-dot-v1"
+)
+
+
+def conversation(
+    vectordb_client,
+    msg,
+    num_context,
+    img_context,
+    history,
+    temperature,
+    max_new_tokens,
+    hf_token,
+    model_path,
+):
+    if hf_token.strip() != "" and model_path.strip() != "":
+        llm = HuggingFaceEndpoint(
+            repo_id=model_path,
+            temperature=temperature,
+            max_new_tokens=max_new_tokens,
+            huggingfacehub_api_token=hf_token,
+        )
+    else:
+        llm = HuggingFaceEndpoint(
+            repo_id="meta-llama/Meta-Llama-3-8B-Instruct",
+            temperature=temperature,
+            max_new_tokens=max_new_tokens,
+            huggingfacehub_api_token=os.getenv("P_HF_TOKEN", "None"),
+        )
+
+    text_collection = vectordb_client.get_collection(
+        "text_db", embedding_function=sentence_transformer_ef
+    )
+    image_collection = vectordb_client.get_collection(
+        "image_db", embedding_function=sentence_transformer_ef
+    )
+
+    results = text_collection.query(
+        query_texts=[msg], include=["documents"], n_results=num_context
+    )["documents"][0]
+    similar_images = image_collection.query(
+        query_texts=[msg],
+        include=["metadatas", "distances", "documents"],
+        n_results=img_context,
+    )
+    img_links = [i["image"] for i in similar_images["metadatas"][0]]
+
+    images_and_locs = [
+        Image.open(io.BytesIO(base64.b64decode(i[1])))
+        for i in zip(similar_images["distances"][0], img_links)
+    ]
+    img_desc = "\n".join(similar_images["documents"][0])
+    if len(img_links) == 0:
+        img_desc = "No Images Are Provided"
+    template = """
+    Context:
+    {context}
+
+    Included Images:
+    {images}
+    
+    Question:
+    {question}
+
+    Answer:
+
+    """
+    prompt = PromptTemplate(template=template, input_variables=["context", "question"])
+    context = "\n\n".join(results)
+    # references = [gr.Textbox(i, visible=True, interactive=False) for i in results]
+    response = llm(prompt.format(context=context, question=msg, images=img_desc))
+    return history + [(msg, response)], results, images_and_locs
+
+
+def check_validity_and_llm(session_states):
+    if session_states.get("processed", False) == True:
+        return gr.Tabs(selected=2)
+    raise gr.Error("Please extract data first")
+
+
+with gr.Blocks(css=CSS, theme=gr.themes.Soft(text_size=sizes.text_md)) as demo:
+    vectordb = gr.State()
+    doc_collection = gr.State(value=[])
+    session_states = gr.State(value={})
+    references = gr.State(value=[])
+
+    gr.Markdown(
+        """<h2><center>Multimodal PDF Chatbot</center></h2>
+    <h3><center><b>Interact With Your PDF Documents</b></center></h3>"""
+    )
+    gr.Markdown(
+        """<center><h3><b>Note: </b> This application leverages advanced Retrieval-Augmented Generation (RAG) techniques to provide context-aware responses from your PDF documents</center><h3><br>
+    <center>Utilizing multimodal capabilities, this chatbot can interpret and answer queries based on both textual and visual information within your PDFs.</center>"""
+    )
+    gr.Markdown(
+        """
+    <center><b>Warning: </b> Extracting text and images from your document and generating embeddings may take some time due to the use of OCR and multimodal LLMs for image description<center>
+    """
+    )
+    with gr.Tabs() as tabs:
+        with gr.TabItem("Upload PDFs", id=0) as pdf_tab:
+            with gr.Row():
+                with gr.Column():
+                    documents = gr.File(
+                        file_count="multiple",
+                        file_types=["pdf"],
+                        interactive=True,
+                        label="Upload your PDF file/s",
+                    )
+                    pdf_btn = gr.Button(value="Next", elem_id="button1")
+
+        with gr.TabItem("Extract Data", id=1) as preprocess:
+            with gr.Row():
+                with gr.Column():
+                    back_p1 = gr.Button(value="Back")
+                with gr.Column():
+                    embed = gr.Button(value="Extract Data")
+                with gr.Column():
+                    next_p1 = gr.Button(value="Next")
+            with gr.Row():
+                include_images = gr.Radio(
+                    ["Include Images", "Exclude Images"],
+                    value="Include Images",
+                    label="Include/ Exclude Images",
+                    interactive=True,
+                )
+                do_ocr = gr.Radio(
+                    ["Get Text With OCR", "Get Available Text Only"],
+                    value="Get Text With OCR",
+                    label="OCR/ No OCR",
+                    interactive=True,
+                )
+
+            with gr.Row(equal_height=True, variant="panel") as row:
+                selected = gr.Dataframe(
+                    interactive=False,
+                    col_count=(1, "fixed"),
+                    headers=["Selected Files"],
+                )
+                prog = gr.HTML(
+                    value="<h1 style='text-align: center'>Click the 'Extract' button to extract data from PDFs<h1>"
+                )
+
+            with gr.Accordion("See Parts of Extracted Data", open=False):
+                with gr.Column(visible=True) as sample_data:
+                    with gr.Row():
+                        with gr.Column():
+                            ext_text = gr.Textbox(
+                                label="Sample Extracted Text", lines=15
+                            )
+                        with gr.Column():
+                            images = gr.Gallery(
+                                label="Sample Extracted Images", columns=1, rows=2
+                            )
+
+        with gr.TabItem("Chat", id=2) as chat_tab:
+            with gr.Accordion("Config (Advanced) (Optional)", open=False):
+                with gr.Row(variant="panel", equal_height=True):
+                    choice = gr.Radio(
+                        ["chromaDB"],
+                        value="chromaDB",
+                        label="Vector Database",
+                        interactive=True,
+                    )
+                    with gr.Accordion("Use your own model (optional)", open=False):
+                        hf_token = gr.Textbox(
+                            label="HuggingFace Token", interactive=True
+                        )
+                        model_path = gr.Textbox(label="Model Path", interactive=True)
+                with gr.Row(variant="panel", equal_height=True):
+                    num_context = gr.Slider(
+                        label="Number of text context elements",
+                        minimum=1,
+                        maximum=20,
+                        step=1,
+                        interactive=True,
+                        value=3,
+                    )
+                    img_context = gr.Slider(
+                        label="Number of image context elements",
+                        minimum=1,
+                        maximum=10,
+                        step=1,
+                        interactive=True,
+                        value=2,
+                    )
+                with gr.Row(variant="panel", equal_height=True):
+                    temp = gr.Slider(
+                        label="Temperature",
+                        minimum=0.1,
+                        maximum=1,
+                        step=0.1,
+                        interactive=True,
+                        value=0.4,
+                    )
+                    max_tokens = gr.Slider(
+                        label="Max Tokens",
+                        minimum=10,
+                        maximum=2000,
+                        step=10,
+                        interactive=True,
+                        value=500,
+                    )
+            with gr.Row():
+                with gr.Column():
+                    ret_images = gr.Gallery("Similar Images", columns=1, rows=2)
+                with gr.Column():
+                    chatbot = gr.Chatbot(height=400)
+            with gr.Accordion("Text References", open=False):
+                # text_context = gr.Row()
+
+                @gr.render(inputs=references)
+                def gen_refs(references):
+                    # print(references)
+                    n = len(references)
+                    for i in range(n):
+                        gr.Textbox(
+                            label=f"Reference-{i+1}", value=references[i], lines=3
+                        )
+
+            with gr.Row():
+                msg = gr.Textbox(
+                    placeholder="Type your question here (e.g. 'What is this document about?')",
+                    interactive=True,
+                    container=True,
+                )
+            with gr.Row():
+                submit_btn = gr.Button("Submit message")
+                clear_btn = gr.ClearButton([msg, chatbot], value="Clear conversation")
+
+    pdf_btn.click(
+        fn=extract_pdfs,
+        inputs=[documents, doc_collection],
+        outputs=[doc_collection, tabs, selected],
+    )
+    embed.click(
+        extract_data_from_pdfs,
+        inputs=[doc_collection, session_states, include_images, do_ocr],
+        outputs=[
+            vectordb,
+            session_states,
+            sample_data,
+            ext_text,
+            images,
+            prog,
+        ],
+    )
+
+    submit_btn.click(
+        conversation,
+        [
+            vectordb,
+            msg,
+            num_context,
+            img_context,
+            chatbot,
+            temp,
+            max_tokens,
+            hf_token,
+            model_path,
+        ],
+        [chatbot, references, ret_images],
+    )
+    msg.submit(
+        conversation,
+        [
+            vectordb,
+            msg,
+            num_context,
+            img_context,
+            chatbot,
+            temp,
+            max_tokens,
+            hf_token,
+            model_path,
+        ],
+        [chatbot, references, ret_images],
+    )
+
+    documents.change(
+        lambda: "<h1 style='text-align: center'>Click the 'Extract' button to extract data from PDFs<h1>",
+        None,
+        prog,
+    )
+
+    back_p1.click(lambda: gr.Tabs(selected=0), None, tabs)
+
+    next_p1.click(check_validity_and_llm, session_states, tabs)
+if __name__ == "__main__":
+    demo.launch()

packages.txt

@@ -0,0 +1,4 @@
+poppler-utils
+tesseract-ocr
+libtesseract-dev
+ghostscript

requirements.txt

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+chromadb==0.5.3
+langchain==0.2.5
+langchain_community==0.2.5
+langchain-huggingface
+numpy<2.0.0
+pandas==2.2.2
+Pillow==10.3.0
+pymupdf==1.24.5
+sentence_transformers==3.0.1
+accelerate
+bitsandbytes
+tf2onnx
+clean-text[gpl]
+python-doctr[torch]
+pypdf

utils.py

@@ -0,0 +1,53 @@
+import pymupdf
+from PIL import Image
+import io
+import gradio as gr
+import base64
+import pandas as pd
+import pymupdf
+
+
+def image_to_bytes(image):
+    img_byte_arr = io.BytesIO()
+    image.save(img_byte_arr, format="PNG")
+    return base64.b64encode(img_byte_arr.getvalue()).decode("utf-8")
+
+
+def extract_pdfs(docs, doc_collection):
+    if docs:
+        doc_collection = []
+        doc_collection.extend(docs)
+    return (
+        doc_collection,
+        gr.Tabs(selected=1),
+        pd.DataFrame([i.split("/")[-1] for i in list(docs)], columns=["Filename"]),
+    )
+
+
+def extract_images(docs):
+    images = []
+    for doc_path in docs:
+        doc = pymupdf.open(doc_path)
+
+        for page_index in range(len(doc)):
+            page = doc[page_index]
+            image_list = page.get_images()
+
+            for _, img in enumerate(image_list, start=1):
+                xref = img[0]
+                pix = pymupdf.Pixmap(doc, xref)
+
+                if pix.n - pix.alpha > 3:
+                    pix = pymupdf.Pixmap(pymupdf.csRGB, pix)
+
+                images.append(Image.open(io.BytesIO(pix.pil_tobytes("JPEG"))))
+    return images
+
+
+def clean_text(text):
+    text = text.strip()
+    cleaned_text = text.replace("\n", " ")
+    cleaned_text = cleaned_text.replace("\t", " ")
+    cleaned_text = cleaned_text.replace("  ", " ")
+    cleaned_text = cleaned_text.strip()
+    return cleaned_text