What exactly is this script training? I don't understand what the input and output arrays are supposed to represent. It looks almost like an XOR search but the last output target isn't correct for that.
The example is for OR.
In general, inputs is mxn matrix. m - training instances and n features. targets is training output matrix. In this case its 4x1 for 4.
I see sometimes, it doesn't converge after those iterations perhaps because of initial weights. There are other techniques I have to use like momentum.