Revert "reverse the P and R"

[LopezGG]

Reverts LopezGG/NN_NER_tensorFlow#3

[LopezGG]

Please explain the change. I believe the original version is the right one

[demianzhang]

I think denominator of calculating P might be y_pred, denominator of calculating R might be y_label.

[happy-nlp]

Hello I downloaded and researched your code, but when running, gradient always appears NAN value, and the adjustment parameter is also not good. What is the reason for this? Do you have such a problem? In addition, I have not found the data used for the test, can you send me a copy of it? If you haven't met the wrong, so the successful operation of the model can send me an indebted forever!