s/CopyGPUToGPU/Copy

Summary: CopyGPUToGPU does not exist. Copy seems to do the trick. Didn't go into details of how copy works, not sure if it ends up triggering UVA.

Reviewed By: akyrola

Differential Revision: D5471014

fbshipit-source-id: d8bc1aed9b19070c92f3ffc76f5617bdd0054563

caffe2/python/core.py

@@ -2071,7 +2071,7 @@ def copy_func_between_devices(src, dst):
         else:
             def fun(net, *args, **kw):
                 with DeviceScope(dst):
-                    return net.CopyGPUToGPU(*args, **kw)
+                    return net.Copy(*args, **kw)
             return fun
 
     if src.device_type == CUDA and dst.device_type == CPU: