At the VietAI Summit 2019, Thang Le from the VietAI team, discussed data augmentation and the concept of the backtranslation. He also discussed how to apply this technique in translation from English to Vietnamese.  In machine learning, we have a dataset and mathematical models. Generally, one tries to optimize the machine learning model by fitting data into the model. One of the things that makes machine learning powerful is that we have lots of data.…