[Doc] Add six paper to awesome paper list (dmlc#2435)

* PPIDataset

* Revert "PPIDataset"

This reverts commit 264bd0c.

* data pipeline user guide

* remove chapter numbers

* Update data.rst

* image in dataset userguide

* update links using ref

* modify the link of save_graphs and load_graphs in dataset user guide

* move image to s3 server.

* fix links and ref

* Hide implementations that may cause confusions to the user

* add papers

README.md

@@ -244,6 +244,18 @@ We are currently in Beta stage.  More features and improvements are coming.
 
 1. [**Graph convolutional regression of cardiac depolarization from sparse endocardial maps**](https://arxiv.org/abs/2009.14068), *Felix Meister, Tiziano Passerini, Chloé Audigier, Èric Lluch, Viorel Mihalef, Hiroshi Ashikaga, Andreas Maier, Henry Halperin, Tommaso Mansi*
 
+1. [**AttnIO: Knowledge Graph Exploration with In-and-Out Attention Flow for Knowledge-Grounded Dialogue**](https://www.aclweb.org/anthology/2020.emnlp-main.280/), EMNLP'20, *Jaehun Jung, Bokyung Son, Sungwon Lyu*
+
+1. [**Learning from Non-Binary Constituency Trees via Tensor Decomposition**](https://arxiv.org/abs/2011.00860), COLING'20, *Daniele Castellana, Davide Bacciu*
+
+1. [**Inducing Alignment Structure with Gated Graph Attention Networks for Sentence Matching**](https://arxiv.org/abs/2010.07668), *Peng Cui, Le Hu, Yuanchao Liu*
+
+1. [**Enhancing Extractive Text Summarization with Topic-Aware Graph Neural Networks**](https://arxiv.org/abs/2010.06253), COLING'20, *Peng Cui, Le Hu, Yuanchao Liu*
+
+1. [**Double Graph Based Reasoning for Document-level Relation Extraction**](https://arxiv.org/abs/2009.13752), EMNLP'20, *Shuang Zeng, Runxin Xu, Baobao Chang, Lei Li*
+
+1. [**Systematic Generalization on gSCAN with Language Conditioned Embedding**](https://arxiv.org/abs/2009.05552), AACL-IJCNLP'20, *Tong Gao, Qi Huang, Raymond J. Mooney*
+
 </details>
 
 ## Installation