Improve model card: Add pipeline tag, library name, and link to Github repo
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by nielsr HF Staff - opened
README.md
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license: cc-by-nc-sa-4.0
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---
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license: cc-by-nc-sa-4.0
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library_name: pytorch
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pipeline_tag: image-segmentation
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---
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<img src="imgs/nnInteractive_header_white.png">
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# Python backend for `nnInteractive: Redefining 3D Promptable Segmentation`
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This repository contains the nnInteractive python backend for our
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[napari plugin](https://github.com/MIC-DKFZ/napari-nninteractive) and [MITK integration](Todo). It can be used for
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python-based inference.
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## What is nnInteractive?
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> Isensee, F.\*, Rokuss, M.\*, Krämer, L.\*, Dinkelacker, S., Ravindran, A., Stritzke, F., Hamm, B., Wald, T., Langenberg, M., Ulrich, C., Deissler, J., Floca, R., & Maier-Hein, K. (2025). nnInteractive: Redefining 3D Promptable Segmentation. https://arxiv.org/abs/2503.08373 \
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> *: equal contribution
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Link: [](https://arxiv.org/abs/2503.08373)
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##### Abstract:
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Accurate and efficient 3D segmentation is essential for both clinical and research applications. While foundation
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models like SAM have revolutionized interactive segmentation, their 2D design and domain shift limitations make them
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ill-suited for 3D medical images. Current adaptations address some of these challenges but remain limited, either
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lacking volumetric awareness, offering restricted interactivity, or supporting only a small set of structures and
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modalities. Usability also remains a challenge, as current tools are rarely integrated into established imaging
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platforms and often rely on cumbersome web-based interfaces with restricted functionality. We introduce nnInteractive,
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the first comprehensive 3D interactive open-set segmentation method. It supports diverse prompts—including points,
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scribbles, boxes, and a novel lasso prompt—while leveraging intuitive 2D interactions to generate full 3D
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segmentations. Trained on 120+ diverse volumetric 3D datasets (CT, MRI, PET, 3D Microscopy, etc.), nnInteractive
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sets a new state-of-the-art in accuracy, adaptability, and usability. Crucially, it is the first method integrated
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into widely used image viewers (e.g., Napari, MITK), ensuring broad accessibility for real-world clinical and research
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applications. Extensive benchmarking demonstrates that nnInteractive far surpasses existing methods, setting a new
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standard for AI-driven interactive 3D segmentation.
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<img src="imgs/figure1_method.png" width="1200">
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## Installation
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### Prerequisites
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You need a Linux or Windows computer with an Nvidia GPU. 10GB of VRAM is recommended. Small objects should work with \<6GB.
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##### 1. Create a virtual environment:
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nnInteractive supports Python 3.10+ and works with Conda, pip, or any other virtual environment. Here’s an example using Conda:
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```
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conda create -n nnInteractive python=3.12
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conda activate nnInteractive
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```
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##### 2. Install the correct PyTorch for your system
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Go to the [PyTorch homepage](https://pytorch.org/get-started/locally/) and pick the right configuration.
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Note that since recently PyTorch needs to be installed via pip. This is fine to do within your conda environment.
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For Ubuntu with a Nvidia GPU, pick 'stable', 'Linux', 'Pip', 'Python', 'CUDA12.6' (if all drivers are up to date, otherwise use and older version):
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```
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pip3 install torch torchvision --index-url https://download.pytorch.org/whl/cu126
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```
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##### 3. Install this repository
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Either install via pip:
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`pip install nninteractive`
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Or clone and install this repository:
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```bash
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git clone https://github.com/MIC-DKFZ/nnInteractive
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cd nnInteractive
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pip install -e .
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```
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## Getting Started
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Here is a minimalistic script that covers the core functionality of nnInteractive:
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```python
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import os
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import torch
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import SimpleITK as sitk
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from huggingface_hub import snapshot_download # Install huggingface_hub if not already installed
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# --- Download Trained Model Weights (~400MB) ---
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REPO_ID = "nnInteractive/nnInteractive"
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MODEL_NAME = "nnInteractive_v1.0" # Updated models may be available in the future
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DOWNLOAD_DIR = "/home/isensee/temp" # Specify the download directory
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download_path = snapshot_download(
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repo_id=REPO_ID,
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allow_patterns=[f"{MODEL_NAME}/*"],
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local_dir=DOWNLOAD_DIR
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)
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# The model is now stored in DOWNLOAD_DIR/MODEL_NAME.
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# --- Initialize Inference Session ---
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from nnInteractive.inference.inference_session import nnInteractiveInferenceSession
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session = nnInteractiveInferenceSession(
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device=torch.device("cuda:0"), # Set inference device
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use_torch_compile=False, # Experimental: Not tested yet
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verbose=False,
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torch_n_threads=os.cpu_count(), # Use available CPU cores
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do_autozoom=True, # Enables AutoZoom for better patching
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use_pinned_memory=True, # Optimizes GPU memory transfers
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)
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# Load the trained model
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model_path = os.path.join(DOWNLOAD_DIR, MODEL_NAME)
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session.initialize_from_trained_model_folder(model_path)
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# --- Load Input Image (Example with SimpleITK) ---
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input_image = sitk.ReadImage("FILENAME")
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img = sitk.GetArrayFromImage(input_image)[None] # Ensure shape (1, x, y, z)
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# Validate input dimensions
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if img.ndim != 4:
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raise ValueError("Input image must be 4D with shape (1, x, y, z)")
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session.set_image(img)
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# --- Define Output Buffer ---
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target_tensor = torch.zeros(img.shape[1:], dtype=torch.uint8) # Must be 3D (x, y, z)
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session.set_target_buffer(target_tensor)
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# --- Interacting with the Model ---
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# Interactions can be freely chained and mixed in any order. Each interaction refines the segmentation.
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# The model updates the segmentation mask in the target buffer after every interaction.
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# Example: Add a point interaction
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# POINT_COORDINATES should be a tuple (x, y, z) specifying the point location.
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session.add_point_interaction(POINT_COORDINATES, include_interaction=True)
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# Example: Add a bounding box interaction
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# BBOX_COORDINATES must be specified as [[x1, x2], [y1, y2], [z1, z2]] (half-open intervals).
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# Note: nnInteractive pre-trained models currently only support **2D bounding boxes**.
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# This means that **one dimension must be [d, d+1]** to indicate a single slice.
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# Example of a 2D bounding box in the axial plane (XY slice at depth Z)
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# BBOX_COORDINATES = [[30, 80], [40, 100], [10, 11]] # X: 30-80, Y: 40-100, Z: slice 10
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session.add_bbox_interaction(BBOX_COORDINATES, include_interaction=True)
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# Example: Add a scribble interaction
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# - A 3D image of the same shape as img where one slice (any axis-aligned orientation) contains a hand-drawn scribble.
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# - Background must be 0, and scribble must be 1.
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# - Use session.preferred_scribble_thickness for optimal results.
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session.add_scribble_interaction(SCRIBBLE_IMAGE, include_interaction=True)
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# Example: Add a lasso interaction
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# - Similarly to scribble a 3D image with a single slice containing a **closed contour** representing the selection.
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session.add_lasso_interaction(LASSO_IMAGE, include_interaction=True)
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# You can combine any number of interactions as needed.
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# The model refines the segmentation result incrementally with each new interaction.
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# --- Retrieve Results ---
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# The target buffer holds the segmentation result.
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results = session.target_buffer.clone()
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# OR (equivalent)
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results = target_tensor.clone()
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# Cloning is required because the buffer will be **reused** for the next object.
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# Alternatively, set a new target buffer for each object:
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session.set_target_buffer(torch.zeros(img.shape[1:], dtype=torch.uint8))
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# --- Start a New Object Segmentation ---
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session.reset_interactions() # Clears the target buffer and resets interactions
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# Now you can start segmenting the next object in the image.
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# --- Set a New Image ---
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# Setting a new image also requires setting a new matching target buffer
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session.set_image(NEW_IMAGE)
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session.set_target_buffer(torch.zeros(NEW_IMAGE.shape[1:], dtype=torch.uint8))
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# Enjoy!
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```
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## Citation
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When using nnInteractive, please cite the following paper:
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> Isensee, F.\*, Rokuss, M.\*, Krämer, L.\*, Dinkelacker, S., Ravindran, A., Stritzke, F., Hamm, B., Wald, T., Langenberg, M., Ulrich, C., Deissler, J., Floca, R., & Maier-Hein, K. (2025). nnInteractive: Redefining 3D Promptable Segmentation. https://arxiv.org/abs/2503.08373 \
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> *: equal contribution
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Link: [](https://arxiv.org/abs/2503.08373)
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# License
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Note that while this repository is available under Apache-2.0 license (see [LICENSE](./LICENSE)), the [model checkpoint](https://huggingface.co/nnInteractive/nnInteractive) is `Creative Commons Attribution Non Commercial Share Alike 4.0`!
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## Acknowledgments
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<p align="left">
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<img src="imgs/Logos/HI_Logo.png" width="150">
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<img src="imgs/Logos/DKFZ_Logo.png" width="500">
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</p>
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This repository is developed and maintained by the Applied Computer Vision Lab (ACVL)
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of [Helmholtz Imaging](https://www.helmholtz-imaging.de/) and the
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[Division of Medical Image Computing](https://www.dkfz.de/en/medical-image-computing) at DKFZ.
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Github repo: https://github.com/MIC-DKFZ/nnInteractive
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