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classification

Performance metrics graph

Classification Performance Metrics

Throughout this blog, we seek to obtain good performance on our classification tasks. Classification is one of the most popular tasks in Machine Learning. Be sure you understand what classification is before going through this tutorial. You can check this Introduction to Machine Learning, specially created for hackers. Since we’re always concerned with how well […]

Introduction to Sentiment Analysis

Getting Started with Sentiment Analysis

What is sentiment analysis The most direct definition of the task is: “Does a text express a positive or negative sentiment?”. Usually, we assign a polarity value to a text. This value is usually in the [-1, 1] interval, 1 being very positive, -1 very negative. Why is sentiment analysis useful Sentiment analysis can have […]

text-classification

Recipe: Text classification using NLTK and scikit-learn

Text classification is most probably, the most encountered Natural Language Processing task. It can be described as assigning texts to an appropriate bucket. A sports article should go in SPORT_NEWS, and a medical prescription should go in MEDICAL_PRESCRIPTIONS. To train a text classifier, we need some annotated data. This training data can be obtained through […]

NLP-FOR-HACKERS