Error occurs when using SameDiff lstmLayer to train

hi, I’m using SameDiff lstmLayer to modeling a sequence predict problem. I wrote two examples, one program is testing/predicting and the other is training. The testing example runs successfully and I got the final result. But the training example threw “not implemented” exception. I want to know if SameDiff lstmLayer has not implemented difference calculation yet ? BTW, I use 1.0.0-beta6 version.