If X is an array, what is the meaning of X[:,0]? In fact, it is not the first time I see such thing, and it's confusing me, but I can't see what is its meaning? Could anyone be able to show me an example? A full clear answer would be appreciated on this question of comma. Please see the file https://github.com/lazyprogrammer/machine_learning_examples/blob/master/ann_class/forwardprop.py Continue reading...
