I am applying for a Master's in Computer Science for the program of artificial intelligence. I already took a class in A.I. but I got a "W" on it. I wasn't doing very well and wanted to drop the class, I was also taking 20 credits at the time and didn't had the time to put the extra effort.
How will this be evaluated during my application for a Masters? Should I mention it or defend it anywhere in my application?
Some more background: I am not really into excuses, but if it helps to better understand why I dropped it. About half the class, dropped the class because the professor was not very good. His grading was unfair, and also for me it felt he had a personal nemesis, because he was also my academic advisor and very often I would disagree in a respectful manner as to what I want to pursue in my degree. I didn't want my GPA to be affected by a C or even F. Also he was not a very effective teacher, but he seems to be very respected in the academia (he has some of his research cited 800+ times). Which I am sure he deserves.
EDIT: I already graduated and recently been working and had to use AI.