Added results for PIE (Grammatical Error Correction using BERT), EMNL…

…P-IJCNLP 2019 (sebastianruder#394)

* Included results for PIE

* Included results for PIE

english/grammatical_error_correction.md

@@ -19,7 +19,9 @@ The shared task setting restricts that systems use only publicly available datas
 | Model | F0.5 | Paper / Source | Code |
 | ------------- | :-----:| --- | :-----: |
 | Transformer + Pre-train with Pseudo Data (Kiyono et al., EMNLP 2019) | 65.0 | [An Empirical Study of Incorporating Pseudo Data into Grammatical Error Correction](https://arxiv.org/abs/1909.00502) | NA |
+| Sequence Labeling with edits using BERT, Faster inference (Ensemble) (Awasthi et al., EMNLP 2019) | 61.2 | [Parallel Iterative Edit Models for Local Sequence Transduction](https://www.aclweb.org/anthology/D19-1435.pdf) | [Official](https://github.com/awasthiabhijeet/PIE) |
 | Copy-Augmented Transformer + Pre-train (Zhao and Wang, NAACL 2019) | 61.15 | [Improving Grammatical Error Correction via Pre-Training a Copy-Augmented Architecture with Unlabeled Data](https://arxiv.org/pdf/1903.00138.pdf) | [Official](https://github.com/zhawe01/fairseq-gec) |
+| Sequence Labeling with edits using BERT, Faster inference (Single Model) (Awasthi et al., EMNLP 2019) | 59.7 | [Parallel Iterative Edit Models for Local Sequence Transduction](https://www.aclweb.org/anthology/D19-1435.pdf) | [Official](https://github.com/awasthiabhijeet/PIE) |
 | CNN Seq2Seq + Quality Estimation (Chollampatt and Ng, EMNLP 2018) | 56.52 | [Neural Quality Estimation of Grammatical Error Correction](https://aclweb.org/anthology/D18-1274) | [Official](https://github.com/nusnlp/neuqe/) |
 | SMT + BiGRU (Grundkiewicz and Junczys-Dowmunt, 2018) | 56.25 | [Near Human-Level Performance in Grammatical Error Correction with Hybrid Machine Translation](https://aclweb.org/anthology/N18-2046)| NA |
 | Transformer (Junczys-Dowmunt et al., 2018) | 55.8 | [Approaching Neural Grammatical Error Correction as a Low-Resource Machine Translation Task](https://aclweb.org/anthology/N18-1055)| [Official](https://github.com/grammatical/neural-naacl2018) |