给定一组学术论文，将其中的关键词提取出来。
1. "Deep Learning Approaches to Unsupervised Monaural Speech Separation"
2. "Using Machine Learning Techniques for Predicting Consumer Purchasing Habits"
3. "The Effects of Social Media on Mental Health Among Teenagers"
1. Deep Learning, Unsupervised Speech Separation
2. Machine Learning, Predicting, Consumer Purchasing Habits
3. Social Media, Mental Health, Teenagers