@ariG23498 Very Thanks kind reply 
Anyway,
Do you know why they expand input 64 dimension to 128 ( Why expand it?)

In my case, 64 dimension Input (actually 64bit size data) is partially correlated.

Is it okay to expand this data?

Do you know why they set num_layer as ‘2’? Any criterion?
Any material that I can refer?
Thanks bro.