DMax-Coder-MMD
Representation-Space MMD for Diffusion Language Models
DMax-Coder-MMD is a 16B diffusion language model for code generation, obtained by MMD post-training of DMax-Coder-16B. It builds on LLaDA2.0-mini and uses DMax's hybrid masked–uniform block diffusion.
The post-training objective minimizes Maximum Mean Discrepancy (MMD) between model samples and reference responses, measured in the representation space of a frozen diffusion language model. The project reports increased tokens per forward pass while maintaining or improving accuracy on the benchmarks below.
Reference results
Results reported in the project README, with decoding threshold 0.9. Each entry is accuracy (%) / tokens per forward pass (TPF). Baseline results are attributed to the original DMax paper in the project README.
| Method | HumanEval-Instruct | MBPP-Instruct |
|---|---|---|
| DMax-Coder | 83.5 / 7.36 | 79.2 / 5.86 |
| DMax-Coder-MMD | 85.9 / 8.07 | 83.0 / 6.10 |
Results can vary with hardware, tensor parallelism, and library versions. TPF measures decoding parallelism; wall-clock speed also depends on the runtime.
Evaluation and inference
Use DMax's dInfer evaluation pipeline. After following the evaluation environment setup in the project README, run from the project repository root:
conda activate dinfer
DOMAIN=code MODEL_PATH=yresearch/DMax-Coder-MMD bash scripts/eval.sh
The project's code evaluation uses threshold 0.9 and evaluates HumanEval-Instruct and MBPP-Instruct.
The checkpoint includes nine Safetensors shards with BF16 parameters and FP32
router bias buffers, plus its tokenizer, chat template, and custom model code.
Direct Transformers loading requires trust_remote_code=True. Pass
dtype=torch.bfloat16 for BF16 loading; the current configuration declares FP32.
Generation requires the DMax/dInfer diffusion decoder. The included custom
backbone does not implement the standard Transformers .generate() interface.
License and acknowledgements
The model follows the Apache-2.0 license of the DMax-Coder base checkpoint and LLaDA2.0-mini. The included model implementation retains its Apache-2.0 notices. The separate MMD training repository is MIT-licensed, with Apache-2.0 third-party components.
We thank the authors of DMax, LLaDA2.0-mini, and dInfer for releasing their models, data, and code.
Citation
If you find this work useful in your research, please consider citing:
@article{drobyshevskiy2026mmd,
title = {Representation-Space MMD for Diffusion Language Models},
author = {Drobyshevskiy, Ilya and Sudakov, Ilia and Semenov, Maksim and Kuznedelev, Denis and
Ignatov, Maksim and Temirchev, Pavel and Balagansky, Nikita and
Meshchaninov, Viacheslav and Gushchin, Nikita and Baranchuk, Dmitry},
journal = {arXiv preprint arXiv:2610.06648},
year = {2026}
}