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Code for the Syl-Concat, Syl-Sum, and Syl-CNN models from the paper Syllable-aware Neural Language Models: A Failure to Beat Character-aware Ones (EMNLP 2017)

Code is written in Python 3 and requires TensorFlow 1.1+. It also requires the following Python modules: numpy, pyphen, argparse. You can install them via:

sudo pip3 install numpy pyphen argparse

Data should be put into the data/ directory, split into train.txt, valid.txt, and test.txt. Each line of the .txt file should be a sentence. The English Penn Treebank (PTB) data is given as the default.

The non-English data (Czech, French, German, Russian, and Spanish) can be downloaded from Jan Botha's website. For ease of use you can use the Yoon Kim's script, which downloads these data and saves them into the relevant folders.

The PTB data above does not have end-of-sentence tokens for each sentence, and by default these are appended. The non-English data already have end-of-sentence tokens for each line so, you want to add --eos " " to the command line.

For non-English data you also need to specify the appropriate hyphenation dictionary which is supported by Pyphen via the --dict option. The complete list of dictionaries is available at LibreOffice's repository.

To reproduce the Syl-Concat result on English PTB from Table 1

python3 LSTM-Syl.py

To reproduce the Syl-Sum result on English PTB from Table 3 use

python3 LSTM-Syl.py --model sum --size medium

To reproduce the Syl-CNN result on Czech DATA-S from Table 3 use

python3 LSTM-Syl.py --model cnn --size medium --data_dir data/cs --dict cs_CZ --eos " "

Training on a larger vocabulary will require sampled softmax (SSM) to train at a reasonable speed. You can use the --ssm 1 option to do this.

To see the full list of options run

python3 LSTM-Syl.py -h