@tqchen 
I can use this feature by building mxnet from source. But I met errors when 
using packages from pip (v1.2, v1.3)

sometimes the error is
```bash
terminate called after throwing an instance of 'dmlc::Error'
  what():  TVMCall CFunc Error:
Traceback (most recent call last):
  File "tvm/_ffi/_cython/./function.pxi", line 38, in 
tvm._ffi._cy3.core.tvm_callback
TypeError: _list() missing 2 required positional arguments: 'name' and 'func'
```
It seems we cannot call 

https://github.com/apache/incubator-mxnet/blob/ff39cf11fdbc2036b59a88f0173e4a6ff481aa08/src/nnvm/tvm_bridge.cc#L178
correctly.

sometimes the error is 
```

Segmentation fault: 11

Stack trace returned 10 entries:
[bt] (0) /usr/local/lib/python3.5/dist-packages/mxnet/libmxnet.so(+0x1d86a2) 
[0x7f8c64e396a2]
[bt] (1) /usr/local/lib/python3.5/dist-packages/mxnet/libmxnet.so(+0x32eb91e) 
[0x7f8c67f4c91e]
[bt] (2) /lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7f8c88d584b0]
[bt] (3) 
/sampa/home/mercy/tvm/python/tvm/_ffi/_cy3/core.cpython-35m-x86_64-linux-gnu.so(+0x15b2c)
 [0x7f8bf07b8b2c]
[bt] (4) /sampa/home/mercy/tvm/build/libtvm.so(+0x60ea72) [0x7f8c1f639a72]
[bt] (5) 
/usr/local/lib/python3.5/dist-packages/mxnet/libmxnet.so(MXTVMBridge+0xd8) 
[0x7f8c67a46638]
[bt] (6) 
/usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(ffi_call_unix64+0x4c)
 [0x7f8c87bace20]
[bt] (7) 
/usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(ffi_call+0x2eb)
 [0x7f8c87bac88b]
[bt] (8) 
/usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(_ctypes_callproc+0x49a)
 [0x7f8c87ba701a]
[bt] (9) 
/usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so(+0x9fcb) 
[0x7f8c87b9afcb]
```


[ Full content available at: 
https://github.com/apache/incubator-mxnet/pull/9880 ]
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