Its Bengio's (very well known deep learning researcher) upcoming textbook. I would highly recommend to anyone interested in deep learning/neural net subset of machine learning.
This course is taught by Andrew Ng. Professor Ng is not only one of the founders of Coursera, but is also a prof at Stanford and Chief Scientist at Baidu. Machine Learning (and Deep Learning in particular) is his specialty, so he is a pretty good resource on the topic :)
Its Bengio's (very well known deep learning researcher) upcoming textbook. I would highly recommend to anyone interested in deep learning/neural net subset of machine learning.