Computers and Intractability: A Guide to the Theory of NP-completeness
Michael R. Garey & David S. Johnson
Non-Convex Optimization for Machine Learning
Prateek Jain & Purushottam Kar
How to Prove It: A Structured Approach
Daniel J. Velleman
Recommender Systems: The Textbook
Charu C. Aggarwal
Computer Vision: Models, Learning, and Inference
Simon J. D. Prince