Andrew Ng Machine Learning (week4)

Great God's Notes:      http://ai-start.com/ml2014/html/week4.html#header-n634

8.7    Suppose you have a multi-class classification problem with 10 classes. Your neural network has 3 layers, and the hidden layer (layer 2) has 5 units. Using the one-vs-all method described here, how many elements does Θ(2)

50    55    60√    66

The multi-class classifier contains ten classes, the activation unit of the third layer is 10 for theta row, the second layer has 5 units, plus a deviation, it is 6 for theta column , the theta dimension should be 10*6