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Model Details

Perception Language Model (PLM) is a state-of-the-art, fully open and reproducible MLLM for transparent research in image and video understanding. It was introduced in "PerceptionLM: Open-Access Data and Models for Detailed Visual Understanding".

[📃 Tech Report] [📂 Github]

Model Overview: PLM consists of a vision encoder with a small scale (<8B parameters) LLM decoder. We start by an analysis of standard training pipelines with available data, without any proprietary model distillation. We investigate large-scale synthetic data and establish key scaling laws to identify critical data gaps that limit video understanding performance, especially for spatio-temporal reasoning and fine-grained understanding tasks. To fill these gaps, we create 2.8M high-quality human-labeled. This release is nearly an order of magnitude larger than the largest existing video datasets.

We provide the training and evaluation code at perception_models codebase. You can find more details in the GitHub repo.

Resource Description Documentation
Evaluation Evaluation of PLM using lmms-eval docs/evaluation.md
Training / Finetuning Training and finetuning instructions for PLM docs/training.md
PLM-VideoBench Evaluation on PLM-VideoBench using lmms-eval docs/plm_videobench.md
End-to-End Finetuning Example End-to-end finetuning example on radiology images docs/finetune_example.md
Generating Response Generate responses using a trained model with generate.py generate.py

PLM Image Benchmark Results

Model DocVQA ChartQA TextVQA InfoQA AI2D OCRBench COCO Nocap Flickr MMMU VQAv2 OKVQA VizWiz MME SEED BLINK CVBench RealWorldQA VSR POPE
PLM1B 90.7 78.6 82.1 63.0 84.9 807 138.6 124.2 100.5 34.8 81.7 61.0 59.7 1603 76.3 46.8 73.8 67.1 68.8 88.4
PLM3B 93.8 84.3 84.3 74.6 90.9 830 144.9 126.5 98.0 41.2 84.3 66.8 64.0 1879 78.5 55.4 81.4 72.4 80.4 88.7
PLM8B 94.6 85.5 86.5 80.9 92.7 870 146.7 129.9 105.6 46.1 85.6 69.6 67.0 1989 79.3 56.0 81.3 75.0 82.8 89.9

PLM Video Benchmark Results

Model VATEX DREAM 1K How2QA MVBench NExTQA PerceptionTest (test) STAR TVQA VideoMME TVBench ActivityNetQA EgoSchema (test) TemporalBench TOMATO MotionBench (dev) TempCompass (MCQ) CGBench (clue) Charades STA VideoHallucer Halluc. EventHallusion
PLM1B 92.5 34.3 86.4 70.1 80.3 72.7 83.7 50.3 49.2 50.4 62.5 60.4 18.2 25.5 52.2 64.6 43.6 55.2 49.2 79.5
PLM3B 96.1 37.4 89.4 74.7 83.4 79.3 84.8 55.3 54.9 58.9 66.2 66.9 23.4 30.9 60.4 69.3 47.2 57.7 55.5 76.5
PLM8B 99.7 35.9 90.7 77.1 84.1 82.7 84.9 59.3 58.3 63.5 67.3 68.8 28.3 33.2 61.4 72.7 46.4 58.6 57.7 77.3

Citation

If you find our code useful for your research, please consider citing:

@article{cho2025PerceptionLM,
  title={PerceptionLM: Open-Access Data and Models for Detailed Visual Understanding},
  author={Jang Hyun Cho and Andrea Madotto and Effrosyni Mavroudi and Triantafyllos Afouras and Tushar Nagarajan and Muhammad Maaz and Yale Song and Tengyu Ma and Shuming Hu and Hanoona Rasheed and Peize Sun and Po-Yao Huang and Daniel Bolya and Suyog Jain and Miguel Martin and Huiyu Wang and Nikhila Ravi and Shashank Jain and Temmy Stark and Shane Moon and Babak Damavandi and Vivian Lee and Andrew Westbury and Salman Khan and Philipp Kr\"{a}henb\"{u}hl and Piotr Doll{\'a}r and Lorenzo Torresani and Kristen Grauman and Christoph Feichtenhofer},
  journal={arXiv},
  year={2025}
}

@article{bolya2025PerceptionEncoder,
  title={Perception Encoder: The best visual embeddings are not at the output of the network},
  author={Daniel Bolya and Po-Yao Huang and Peize Sun and Jang Hyun Cho and Andrea Madotto and Chen Wei and Tengyu Ma and Jiale Zhi and Jathushan Rajasegaran and Hanoona Rasheed and Junke Wang and Marco Monteiro and Hu Xu and Shiyu Dong and Nikhila Ravi and Daniel Li and Piotr Doll{\'a}r and Christoph Feichtenhofer},
  journal={arXiv},
  year={2025}
}
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