Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The first few chapters are not helpful, giving no examples on how to work problems.

This text assumes much more than it should. Although I understand Diff EQ, and some Linear Algebra, the text was basically very vague. I prefer exhaustive explanations, as opposed to "a smoke and mirrors" approach. Unfortunately this book fits within the usual collection of over-generalized and poorly explained material that has sadly become the norm in technical education. Why give us exercises covering theorems that the book may not have even addressed. At a minimum, anything that is educational should be helpful.