Sentiment-analysis-on-Covid-19-tweets

Objective:

Classify 45k tweets on Covid-19 as positive or negative based on the following machine learning and deep learning models:

• Multinomial Naive Bayes Model
• Random Forests
• ADABoost
• XGBoost
• Simple RNN
• LSTM
• GRU
• Bidirectional LSTM
• BERT

For machine learning models, the tweets are preprocessed using the following NLP methods:

• Bag-of-words model
• Bag-of-POS model
• Pre-trained Spacy word embeddings

For neural networks, we use the following preprocessing methods:

• Pre-trained Spacy word embeddings
• Keras embedding layers

Results:

• Among machine learning models, XGBoost trained on a bag-of-words model has the best performance in terms of accuracy (82%) and AUC ROC (90%)
• Among all models, BERT has the best performance (accuracy = 94%)

References:

• https://www.kaggle.com/andreshg/nlp-glove-bert-tf-idf-lstm-explained
• https://www.kaggle.com/tanulsingh077/deep-learning-for-nlp-zero-to-transformers-bert#Bi-Directional-RNN's
• Azunre, P. (2021). Transfer learning for natural language processing. Simon and Schuster.
• Ferrario, A., & Nägelin, M. (2020). The art of natural language processing: classical, modern and contemporary approaches to text document classification. Modern and Contemporary Approaches to Text Document Classification (March 1, 2020).

Data source:

https://www.kaggle.com/datatattle/covid-19-nlp-text-classification