README.md

---
library_name: transformers
license: apache-2.0
language:
- en
base_model:
- HuggingFaceTB/SmolVLM-256M-Instruct
pipeline_tag: image-text-to-text
---

<div style="display: flex; align-items: center;">
    <img src="https://huggingface.co/ds4sd/SmolDocling-256M-preview/resolve/main/assets/SmolDocling_doctags1.png" alt="SmolDocling" style="width: 200px; height: auto; margin-right: 20px;">
    <div>
        <h3>SmolDocling-256M-preview</h3>
        <p>SmolDocling is a multimodal Image-Text-to-Text model designed for efficient document conversion. It retains Docling's most popular features while ensuring full compatibility with Docling through seamless support for <strong>DoclingDocuments</strong>.</p>
    </div>
</div>

### 🚀 Features:  
- 🏷️ **DocTags for Efficient Tokenization** – Introduces DocTags an efficient and minimal representation for documents that is fully compatible with **DoclingDocuments**.  
- 🔍 **OCR (Optical Character Recognition)** – Extracts text accurately from images.  
- 📐 **Layout and Localization** – Preserves document structure and document element **bounding boxes**.  
- 💻 **Code Recognition** – Detects and formats code blocks including identation.  
- 🔢 **Formula Recognition** – Identifies and processes mathematical expressions.  
- 📊 **Chart Recognition** – Extracts and interprets chart data.  
- 📑 **Table Recognition** – Supports column and row headers for structured table extraction.  
- 🖼️ **Figure Classification** – Differentiates figures and graphical elements.  
- 📝 **Caption Correspondence** – Links captions to relevant images and figures.  
- 📜 **List Grouping** – Organizes and structures list elements correctly.  
- 📄 **Full-Page Conversion** – Processes entire pages for comprehensive document conversion including all page elements (code, equations, tables, charts etc.) 
- 🔲 **OCR with Bounding Boxes** – OCR regions using a bounding box.
- 📂 **General Document Processing** – Trained for non-scientific documents and scientific.  
- 🔄 **Seamless Docling Integration** – Import into **Docling** and export in multiple formats.
- 📚 **Multi-Page & Full Document Conversion** – Supporting upto 3 pages.



## How to get started

You can use transformers or docling to perform inference:

<details>
<summary>Single image inference using Tranformers</summary>

```python
import torch
from PIL import Image
from transformers import AutoProcessor, AutoModelForVision2Seq
from transformers.image_utils import load_image

DEVICE = "cuda" if torch.cuda.is_available() else "cpu"

# Load images
image = load_image("https://cdn.britannica.com/61/93061-050-99147DCE/Statue-of-Liberty-Island-New-York-Bay.jpg")

# Initialize processor and model
processor = AutoProcessor.from_pretrained("ds4sd/SmolDocling-256M-preview")
model = AutoModelForVision2Seq.from_pretrained(
    "ds4sd/SmolDocling-256M-preview",
    torch_dtype=torch.bfloat16,
    _attn_implementation="flash_attention_2" if DEVICE == "cuda" else "eager",
).to(DEVICE)

# Create input messages
messages = [
    {
        "role": "user",
        "content": [
            {"type": "image"},
            {"type": "text", "text": "Convert this page to docling."}
        ]
    },
]

# Prepare inputs
prompt = processor.apply_chat_template(messages, add_generation_prompt=True)
inputs = processor(text=prompt, images=[image], return_tensors="pt")
inputs = inputs.to(DEVICE)

# Generate outputs
generated_ids = model.generate(**inputs, max_new_tokens=8192)
prompt_length = inputs.input_ids.shape[1]
trimmed_generated_ids = generated_ids[:, prompt_length:]
doctags = processor.batch_decode(
    trimmed_generated_ids,
    skip_special_tokens=False,
)[0].lstrip()

# create a docling document
doc = DoclingDocument(name="Document")

# populate it
doc.load_from_document_tokens([doctags], [image])

# export as any format
# HTML
# print(doc.export_to_html())
# with open(output_file, "w", encoding="utf-8") as f:
#     f.write(doc.export_to_html())
# MD
# print(doc.export_to_markdown())

```
</details>


<details>
<summary>Multi-page image inference using Tranformers</summary>

```python
import torch
from PIL import Image
from transformers import AutoProcessor, AutoModelForVision2Seq
from transformers.image_utils import load_image

DEVICE = "cuda" if torch.cuda.is_available() else "cpu"

# Load images
page_1 = load_image("https://cdn.britannica.com/61/93061-050-99147DCE/Statue-of-Liberty-Island-New-York-Bay.jpg")
page_2 = load_image("https://cdn.britannica.com/61/93061-050-99147DCE/Statue-of-Liberty-Island-New-York-Bay.jpg")

# Initialize processor and model
processor = AutoProcessor.from_pretrained("ds4sd/SmolDocling-256M-preview")
model = AutoModelForVision2Seq.from_pretrained(
    "ds4sd/SmolDocling-256M-preview",
    torch_dtype=torch.bfloat16,
    _attn_implementation="flash_attention_2" if DEVICE == "cuda" else "eager",
).to(DEVICE)

# Create input messages
messages = [
    {
        "role": "user",
        "content": [
            {"type": "image"},
            {"type": "image"},
            {"type": "text", "text": "Convert this document to docling."}
        ]
    },
]

# Prepare inputs
prompt = processor.apply_chat_template(messages, add_generation_prompt=True)
inputs = processor(text=prompt, images=[page_1, page_2], return_tensors="pt")
inputs = inputs.to(DEVICE)

# Generate outputs
generated_ids = model.generate(**inputs, max_new_tokens=8192)
prompt_length = inputs.input_ids.shape[1]
trimmed_generated_ids = generated_ids[:, prompt_length:]
doctags = processor.batch_decode(
    trimmed_generated_ids,
    skip_special_tokens=False,
)[0].lstrip()

# create a docling document
doc = DoclingDocument(name="Document")

# populate it
doc.load_from_document_tokens([doctags], [page_1, page_2])

# export as any format
# HTML
# print(doc.export_to_html())
# with open(output_file, "w", encoding="utf-8") as f:
#     f.write(doc.export_to_html())
# MD
# print(doc.export_to_markdown())
``````
</details>

<details>
<summary> 🚀 Fast Batch Inference Using VLLM</summary>

```python
!pip install vllm

import time
import os
from vllm import LLM, SamplingParams
from PIL import Image

# Configuration
MODEL_PATH = "ds4sd/SmolDocling-256M-preview"
IMAGE_DIR = "images_dir"
OUTPUT_DIR = "output_pred_dir"
PROMPT_TEXT = "Convert page to Docling."

# Ensure output directory exists
os.makedirs(OUTPUT_DIR, exist_ok=True)

# Initialize LLM
llm = LLM(model=MODEL_PATH, limit_mm_per_prompt={"image": 1})

sampling_params = SamplingParams(
    temperature=0.0,
    max_tokens=8192)

chat_template = f"<|im_start|>User:<image>{PROMPT_TEXT}<end_of_utterance>\nAssistant:"

image_files = sorted([f for f in os.listdir(IMAGE_DIR) if f.lower().endswith((".png", ".jpg", ".jpeg"))])

start_time = time.time()
total_tokens = 0

for idx, img_file in enumerate(image_files, 1):
    img_path = os.path.join(IMAGE_DIR, img_file)
    image = Image.open(img_path).convert("RGB")

    llm_input = {"prompt": chat_template, "multi_modal_data": {"image": image}}
    output = llm.generate([llm_input], sampling_params=sampling_params)[0]
    
    output_text = output.outputs[0].text
    output_filename = os.path.splitext(img_file)[0] + ".dt"
    output_path = os.path.join(OUTPUT_DIR, output_filename)

    with open(output_path, "w", encoding="utf-8") as f:
        f.write(output_text)

print(f"Total time: {time.time() - start_time:.2f} sec")
```
</details>

## DocTags

<img src="https://huggingface.co/ds4sd/SmolDocling-256M-preview/resolve/main/assets/doctags_v2.png" width="800" height="auto" alt="Image description">
DocTags create a clear and structured system of tags and rules that separate text from the document's structure. This makes things easier for Image-to-Sequence models by reducing confusion. On the other hand, converting directly to formats like HTML or Markdown can be messy—it often loses details, doesn’t clearly show the document’s layout, and increases the number of tokens, making processing less efficient.
DocTags are integrated with Docling, which allows export to HTML, Markdown, and JSON. These exports can be offloaded to the CPU, reducing token generation overhead and improving efficiency.

## Supported Instructions  
| Instruction | Description |
| :---: | :---: |
| Full conversion | Convert this page to docling. |
| Chart | Convert chart to table (e.g., &lt;chart&gt;). |
| Formula | Convert formula to LaTeX (e.g., &lt;formula&gt;). |
| Code | Convert code to text (e.g., &lt;code&gt;). |
| Table | Convert table to OTSL (e.g., &lt;otsl&gt;). |
| No-Code Actions/Pipelines | OCR the text in a specific location: &lt;loc_155&gt;&lt;loc_233&gt;&lt;loc_206&gt;&lt;loc_237&gt; |
|  | Identify element at: &lt;loc_247&gt;&lt;loc_482&gt;&lt;10c_252&gt;&lt;loc_486&gt; |
|  | Find all 'text' elements on the page, retrieve all section headers. |
|  | Detect footer elements on the page. |


- More *Coming soon!* 🚧

#### Model Summary

- **Developed by:** Docling Team
- **Model type:** Multi-modal model (image+text)
- **Language(s) (NLP):** English
- **License:** Apache 2.0
- **Finetuned from model:** Based on [Idefics3](https://huggingface.co/HuggingFaceM4/Idefics3-8B-Llama3) (see technical summary)

**Repository:** [More Information Needed]
**Paper [optional]:** [More Information Needed]
**Demo [optional]:** [More Information Needed]