manage to create a failing tf test case for beignet.  seems its to do with using one buffer for both source and destintaion tensors
manage to create a failing tf test case for beignet.  seems its to do with using one buffer for both source and destintaion tensors

hughperkins/coriander,hughperkins/cuda-on-cl,hughperkins/cuda-on-cl,hughperkins/cuda-on-cl,hughperkins/coriander,hughperkins/coriander,hughperkins/coriander,hughperkins/cuda-on-cl