It amazes me how nobody has yet seize the huge demand of knowledge on machine / deep learning and do something oriented to the average programmer without deep knowledge of algebra, maths or statistics.
It will be a Best Seller if:
1) Does not include any formula, instead explain the concepts behind with real life examples, we don't need to know the details, just have the basics so we can understand the concepts in code, preferable in pseudocode so is water down to a minimun.
Example: https://medium.com/@ageitgey/machine-learning-is-fun-80ea3ec3c471#.7377bbqjf
2) Show a lot of possible use cases, not only the usual ones ( character recognition, image recognition, etc) , but how we as programmers can use it on every day cases, for example instead of using 100 rules in Regex to process scraped text, use a deep learning algorithm. With both cases explained side to side.
Example: https://medium.com/xeneta/boosting-sales-with-machine-learning-fbcf2e618be3#.yjofcvrg7
Any other suggestion to the future Best Seller will be welcome