Enhancement: tutorials about training on a self-defining datasets

[lucasjinreal]

Thanks for this wonderful library, but it would be much more intuitive for users to get started by providing some simple but clearly training process on self-defined dataset.

[ozancaglayan]

Hello,

thank you! Do you mean something different than the recent examples: https://github.com/lium-lst/nmtpytorch/tree/master/examples/v4.0.0