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-rw-r--r--bitsandbytes/autograd/_functions.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/bitsandbytes/autograd/_functions.py b/bitsandbytes/autograd/_functions.py
index 9928fbd..407f14b 100644
--- a/bitsandbytes/autograd/_functions.py
+++ b/bitsandbytes/autograd/_functions.py
@@ -370,6 +370,8 @@ class MatMul8bitLt(torch.autograd.Function):
if state.threshold > 0.0 and subA is not None:
grad_B[:, idx] += torch.matmul(grad_output.t(), subA)
+ raise NotImplementedError("!!")
+
if req_gradA:
if state.CBt is not None:
C32grad, Sgrad = F.transform(Cgrad, "col32")