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I found this: enter image description here http://www2.cs.uregina.ca/~dbd/cs831/notes/confusion_matrix/confusion_matrix.html

defining TP,FP,TN, FN as: enter image description here

while on the other hand I often find it in such form:

enter image description here http://www.cs.cornell.edu/courses/cs578/2003fa/performance_measures.pdf

Which notation for confusion matrix is more accurate?

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There is unfortunately no consensus on the correct notation. You can also find, like on the Wikipedia page about type I and type II errors, a third notation:

enter image description here

My preference goes to the first notation you mention (http://www2.cs.uregina.ca/~dbd/cs831/notes/confusion_matrix/confusion_matrix.html), as it extends to any number of classes unlike the other notations (since label 0 is usually assigned to the negative class, and label 1 is assigned to the positive class).

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