Tensorflow Copy Weights Issue

I am using Tensorflow 0.8 to train the Deep Neural Networks. Currently, I encounter an issue that I want to define two exact same Neural Networks N1 and N2, and I train N1, during

Solution 1:

If you could have your code/ more detail here that would be beneficial. However, you can return the session you're using to train N1 and access it while you want to train N2.