How I get nodes names for input and output in Keras frozen model (.PB)

Hello everybody,

I'm using a labview 2018 x64, and I trained a model with keras and tensorflow 1.4. I'm using IMAQ DL Model Run block, but the name of outout node that I put in this not work. One error appears talking that node name not included in graph. In my python code, the keras return predictions/Softmax with output node name but is not work in that block.

P.S. I'm using th aplication for image classification.

Thanks for yours help