Overview

This repository contains the source code for the models used for DataStories team's submission for SemEval-2017 Task 4 “Sentiment Analysis in Twitter”. The model is described in the paper "DataStories at SemEval-2017 Task 4: Deep LSTM with Attention for Message-level and Topic-based Sentiment Analysis".

Citation:

@InProceedings{baziotis-pelekis-doulkeridis:2017:SemEval2,
  author    = {Baziotis, Christos  and  Pelekis, Nikos  and  Doulkeridis, Christos},
  title     = {DataStories at SemEval-2017 Task 4: Deep LSTM with Attention for Message-level and Topic-based Sentiment Analysis},
  booktitle = {Proceedings of the 11th International Workshop on Semantic Evaluation (SemEval-2017)},
  month     = {August},
  year      = {2017},
  address   = {Vancouver, Canada},
  publisher = {Association for Computational Linguistics},
  pages     = {747--754}
}

The message-level sentiment analysis model, for SubTask A.

The target-based sentiment analysis model, for SubTasks B,C,D,E.

Notes

• If what you are just interested in the source code for the model then just see models/neural/keras_models.py.
• The models were trained using Keras 1.2. In order for the project to work with Keras 2 some minor changes will have to be made.

Prerequisites

1 - Install Requirements

pip install -r /datastories-semeval2017-task4/requirements.txt

Ubuntu:

sudo apt-get install graphviz

Windows: Install graphiz from here:http://www.graphviz.org/Download_windows.php

2 - Download pre-trained Word Embeddings

The models were trained on top of word embeddings pre-trained on a big collection of Twitter messages. We collected a big dataset of 330M English Twitter messages posted from 12/2012 to 07/2016. For training the word embeddings we used GloVe. For preprocessing the tweets we used ekphrasis, which is also one of the requirements of this project.

You can download one of the following word embeddings:

• datastories.twitter.50d.txt: 50 dimensional embeddings
• datastories.twitter.100d.txt: 100 dimensional embeddings
• datastories.twitter.200d.txt: 200 dimensional embeddings
• datastories.twitter.300d.txt: 300 dimensional embeddings

Place the file(s) in /embeddings folder, for the program to find it.

Execution

Word Embeddings

In order to specify which word embeddings file you want to use, you have to set the values of WV_CORPUS and WV_WV_DIM in model_message.py and model_target.py respectively. The default values are:

WV_CORPUS = "datastories.twitter"
WV_DIM = 300

The convention we use to identify each file is:

{corpus}.{dimensions}d.txt

This means that if you want to use another file, for instance GloVe Twitter word embeddings with 200 dimensions, you have to place a file like glove.200d.txt inside /embeddings folder and set:

WV_CORPUS = "glove"
WV_DIM = 200

Model Training

You will find the programs for training the Keras models, in /models folder.

models/neural/keras_models
│   keras_models.py  : contains the Keras models
│   model_message.py : script for training the model for Subtask A
│   model_target.py  : script for training the models for Subtask B and D