Minor update

Only a few minor changes since last time based on feedback people have sent me and a general clean-up of Chapter 18. Still plenty more mistakes in there though, I think, so please keep sending in the feedback.

Update

Since last time, I've just corrected a lot of tiny errors (thanks to people who helped me by mailing in errata) and worked on the index, which is now in much better shape. Plan for the next couple of weeks is to work on the shape and visual words chapters...

Update

Another update yesterday. I've corrected many small mistakes throughout the book. I've worked on the description of the EM algorithm and added a couple of figures. I've also done a lot of work on the shape chapter - I'm about half way through, but it's more coherent & correct now.

If you are planning on reading the book, then please please please try to find the time to mail me some comments. They are proving so useful to me and the quality is really increasing I think.