Reading data of class STRING(50331965) is unsupported stack traceback

[Tae618]

I created my hdf5 file by python with
embed_info.create_dataset('vocab',(count,),dtype='S10',data=vocab)

When I open that file using torch, it goes wrong.
Here is the error log:
torch/install/share/lua/5.1/hdf5/ffi.lua:335: Reading data of class STRING(50331965) is unsupported
stack traceback:
[C]: in function 'error'
/home/lyb/torch/install/share/lua/5.1/hdf5/ffi.lua:335: in function '_getTorchType'
/home/lyb/torch/install/share/lua/5.1/hdf5/dataset.lua:88: in function 'getTensorFactory'
/home/lyb/torch/install/share/lua/5.1/hdf5/dataset.lua:138: in function 'partial'
[string "a= file:read('/embed_info/vocab'):partial({1,2})"]:1: in main chunk
[C]: in function 'xpcall'
/home/lyb/torch/install/share/lua/5.1/trepl/init.lua:669: in function 'repl'
.../lyb/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:199: in main chunk
[C]: at 0x00406670

Anyone has met such a question?