add another

Author: bob7783

nlp_class3/extra_reading.txt

@@ -41,4 +41,7 @@ https://research.googleblog.com/2017/12/tacotron-2-generating-human-like-speech.
 
 An Empirical Evaluation of Generic Convolutional and Recurrent Networks for Sequence Modeling
 https://arxiv.org/abs/1803.01271
-(just released March 2018!)
+(just released March 2018!)
+
+Relational recurrent neural networks
+https://arxiv.org/abs/1806.01822