📝 Vietnamese NLP – POS Tagging Benchmarks & Resources

1. VLSP 2013 POS Tagging

📊 Dataset: 27,000+ sentences for training, 870 dev, 2,120 test (from VLSP 2013 Shared Task)

Model	Accuracy	Method / Reference	Code
PhoBERT-large	96.8	Nguyen et al. ArXiv'20	Official
vELECTRA	96.77	Bui et al. ArXiv'20	Official
PhoBERT-base	96.7	Nguyen et al. ArXiv'20	Official
VnMarMoT	95.88	Nguyen et al. NAACL'18	Official
BiLSTM-CRFs + CNN-char	95.40	Ma et al. ACL'16	Link
BiLSTM-CRF + LSTM-char	95.31	Lample et al. NAACL'16	Link
BiLSTM-CRF	95.31	Huang et al. ArXiv'15	Link
RDRPOSTagger	95.11	Nguyen et al. EACL'14	Official
JointWPD	94.03	Nguyen et al. '18

2. VietTreeBank

📁 Paper: VietTreeBank Paper
Dataset: train: 7,268 | dev: 1,038 | test: 2,077 sentences

Model	Accuracy	Method	Code	Note
BiLSTM-CRFs	93.52	Nguyen et al. '18	Official	10-fold CV
VNTagger	93.40	Le et al. TALN'10	Official	10-fold CV
RDRPOSTagger	91.96	Pham et al. IJCNLP'17	Official	5-fold CV
NNVLP	91.92	Pham et al. IJCNLP'17	Official	5-fold CV
vTools	90.73	Tran et al. VLSP'13	Official
Vitk	88.41		Official

3. Social Media POS Tagging

📄 Vietnamese POS Tagging for Social Media Text - Ngo et al. 2016
📄 A POS Tagging Model for Vietnamese Social Media Text Using BiLSTM-CRF with Rich Features - Ngo et al. 2019
📄 An Empirical Study on POS Tagging for Vietnamese Social Media Text - Ngo et al. 2017

4. Miscellaneous Papers & Datasets

📄 Nguyen et al. NICS'18 – Building Vietnamese Linguistic Resources for Social Network Text Analysis
📄 Nguyen et al. ALTA'17
📄 Nguyen et al. 2015
📄 Nguyen et al. 2014
📄 Nguyen et al. 2011
📄 Nguyen et al. 2011
📄 Nguyen et al. 2010
📄 Ngo et al. 2016
📄 Phan et al. 2008
📄 Nguyen et al. 2006
📄 Nguyen et al. 2003

5. Tools, Demos & Open Source Code

🔗 OpenFPT: Vietnamese Accentizer
🔗 vncorenlp/VnCoreNLP java
🔗 pth1993/NNVLP python,bash
🔗 pyvi python
🔗 Vitk java
🔗 viet-morphological-analysis-crf python (demo)
🔗 lupanh/vTools python
🔗 truongdo/vita c++
🔗 RDRPOSTagger python
🔗 vnTagger java