OpenDDE-Preview

OpenDDE is an open-source, all-atom biomolecular foundation model that turns co-folding into a scalable engine for structure prediction, design, and optimization in drug discovery.

OpenDDE is a preview release. CLI flags, input/output JSON fields, and released checkpoints may change between versions, and predictions are not guaranteed to be reproducible across releases. It is not yet intended for production pipelines. Please open an issue for bugs, regressions, or feature requests.

News

• 2026-07-03: OpenDDE-Preview has been released! See the technical report.
  • Model weights can be downloaded from Hugging Face: opendde.pt | opendde_abag.pt
  • The Docker image can be pulled with docker pull aurekaresearch/opendde:v1

Installation

OpenDDE requires Python >=3.11. The package pins PyTorch, so install with uv and choose the matching PyTorch backend explicitly.

GPU/CUDA install, for Linux CUDA environments:

uv venv --python 3.11
source .venv/bin/activate
uv pip install --torch-backend cu126 'opendde[gpu]'
opendde doctor

CPU-only install:

uv venv --python 3.11
source .venv/bin/activate
uv pip install --torch-backend cpu 'opendde[cpu]'
opendde doctor

From a source checkout, install editable mode instead:

uv venv --python 3.11
source .venv/bin/activate
uv pip install --torch-backend cpu -e '.[cpu]'
uv pip install --group dev
opendde doctor

For full source and Docker setup notes, see docs/inference_instructions.md and docs/docker_installation.md. Pull the prebuilt Docker image with:

docker pull aurekaresearch/opendde:v1

Model and Runtime Data

OpenDDE reads checkpoints and runtime assets from OPENDDE_ROOT_DIR, defaulting to ~/.cache/opendde when the environment variable is unset:

$OPENDDE_ROOT_DIR/
├── checkpoint/opendde.pt
├── common/
└── search_database/        # needed for local template/RNA-MSA preprocessing

From a source checkout, use the repository helper script to prepare the runtime layout:

export OPENDDE_ROOT_DIR=/path/to/opendde_data
bash scripts/download_opendde_data.sh

The helper script lives in the source tree and is not installed with the opendde Python package. If you installed OpenDDE from a wheel or package index, either run the script from a cloned checkout, or let opendde pred download the default checkpoint and common runtime files when they are missing. You can also place checkpoint files manually under $OPENDDE_ROOT_DIR/checkpoint/.

For a prediction that disables protein MSA, template search, and RNA MSA, the large search_database/ files are not needed. From a source checkout, use:

bash scripts/download_opendde_data.sh --skip-search-database

Released checkpoints:

Checkpoint	Use case	Download
opendde.pt	General-purpose checkpoint.	opendde.pt
opendde_abag.pt	Checkpoint tuned on antibody-antigen.	opendde_abag.pt

Use opendde.pt with -n opendde_v1 for the default model. For ABAG runs, keep the filename as opendde_abag.pt and pass it explicitly:

opendde pred \
  -i input.json \
  -o ./output \
  --load_checkpoint_path "$OPENDDE_ROOT_DIR/checkpoint/opendde_abag.pt"

Detailed asset setup, mirrors, and Docker data mounts are documented in docs/inference_instructions.md.

Running Your First Prediction

Save this minimal OpenDDE input as tiny.json:

[
  {
    "name": "tiny",
    "modelSeeds": [101],
    "sequences": [
      {
        "proteinChain": {
          "sequence": "ACDEFGHIK",
          "count": 1
        }
      }
    ]
  }
]

Run a small compatibility-oriented prediction. This disables external feature searches, so only the checkpoint and common runtime files are required:

opendde pred \
  -i tiny.json \
  -o ./output \
  -n opendde_v1 \
  --use_msa false \
  --use_template false \
  --use_rna_msa false \
  --sample 1 \
  --step 200 \
  --cycle 10

Defaults are applied automatically: inference runs in fp32, triangle kernels use auto dispatch, and seeds come from the job's modelSeeds unless --seeds is provided. On CPU this example may be slow, but it avoids GPU-only kernels and large search databases.

Outputs are written under:

output/<job_name>/seed_<seed>/predictions/

For production runs, enable the preprocessing features you need, for example --use_msa true, --use_template true, or --use_rna_msa true. Those paths may require network access, HMMER/Kalign binaries, and large local search databases; see the inference guide for details.

4-GPU Fold-CP Inference

OpenDDE supports a four-GPU Fold-CP inference mode for larger inputs. Launch it with torchrun so that one process runs on each GPU:

CUDA_VISIBLE_DEVICES=0,1,2,3 torchrun --standalone --nproc_per_node 4 \
  -m runner.batch_inference pred \
  -i examples/protein_200.json \
  -o ./output_cp4 \
  -n opendde_v1 \
  --use_msa false \
  --use_template false \
  --use_rna_msa false \
  --sample 1 \
  --step 200 \
  --cycle 10 \
  --foldcp_mode distributed \
  --foldcp_size_dp 1 \
  --foldcp_size_cp 4

--foldcp_size_cp 4 uses a 2 x 2 context-parallel mesh. For normal single-GPU or CPU inference, omit the Fold-CP flags or use --foldcp_mode single.

Input JSON

OpenDDE input is a top-level list of jobs. Each job contains sequences entries such as proteinChain, dnaSequence, rnaSequence, ligand, or ion. covalent_bonds is optional and should be added only when explicit covalent links are needed.

See docs/infer_json_format.md for the full schema, including covalent bonds, ligands, modifications, MSA paths, and template paths.

CLI Overview

opendde pred    # run inference
opendde doctor  # inspect Python/CUDA/kernel setup
opendde json    # convert PDB/CIF structures to OpenDDE JSON
opendde msa     # protein MSA preprocessing
opendde mt      # protein MSA + template preprocessing
opendde prep    # protein MSA + template + RNA MSA preprocessing

Use opendde <command> --help for command-specific options. Public model names currently include opendde_v1; use --load_checkpoint_path for alternate checkpoint files such as opendde_abag.pt.

Documentation

• Inference instructions
• Docker installation
• Input JSON format
• MSA/template/RNA-MSA pipeline
• Kernel options
• Supported models
• Tutorial

Citation and Acknowledgements

If you use OpenDDE in your work, please cite this software and the related work. OpenDDE builds on ideas and components from the AlphaFold 3 ecosystem, including AlphaFold 3, Protenix, OpenFold, and ColabFold.

License

OpenDDE is released under the Apache-2.0 license. See LICENSE.

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