This is self-contained package to train a language model on word level Penn Tree Bank dataset. It achieves 115 perplexity for a small model in 1h, and 81 perplexity for a big model in a day. Model ensemble of 38 big models gives 69 perplexity. This code is derived from https://github.com/wojciechz/learning_to_execute (the same author, but a different company).

More information: http://arxiv.org/pdf/1409.2329v4.pdf

Modifications to the original code:

• Made functions global and put the main part outside of a function, for easier interactive sessions.
• Added a4_commununication_loop.lua for an example of stdin/stdout communication.
• Added character-preprocessed train and validation ptb set in data/.
• Modified data.lua so we can all easily load the data in the same way and agree on the dictionary.
• Added a simple script a4_vocab.lua that loads the data and prints the character-level vocabulary (which is the vocabulary that will also be used in grading).
• Added a4_grading.py so you can test how your program performance will be automatically evaluated.

For more information, see the assignment instructions pdf.