Question about name_node and reuse_variable

[LinHungShi]

Hi, thanks for your implementation of voxelnet. Since this is my first time to train with multi-gpu, I am confused with the way you use scope for multi-gpu training.

1. What's the goal of using name node when creating model.

2. From my understanding of get_variable_scope().reuse_variables, it is used when we want to reuse the variable under the same scope. However, since variables are created under different name scopes, how can variables be reused under different scopes? Does it mean the name node is not being used when getting variable scope?