## Description

(Note: the experiments here are only about language modeling)

ptb is short for Penn Treebank.


About the Penn Treebank corpus:
  - This corpus is free for research purposes
  - ptb.train.txt: train set
  - ptb.valid.txt: development set (should be used just for tuning hyper-parameters, but not for training)
  - ptb.test.txt: test set for reporting perplexity

You can download the dataset from one of the following URLs:

- https://github.com/townie/PTB-dataset-from-Tomas-Mikolov-s-webpage
- http://www.fit.vutbr.cz/~imikolov/rnnlm/simple-examples.tgz
- https://deepai.org/dataset/penn-treebank