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-rw-r--r--bitsandbytes/autograd/_functions.py10
1 files changed, 6 insertions, 4 deletions
diff --git a/bitsandbytes/autograd/_functions.py b/bitsandbytes/autograd/_functions.py
index 7293637..538267b 100644
--- a/bitsandbytes/autograd/_functions.py
+++ b/bitsandbytes/autograd/_functions.py
@@ -316,15 +316,14 @@ class MatMul8bitLt(torch.autograd.Function):
if bias is None or bias.dtype == torch.float16:
output = F.mm_dequant(out32, Sout32, SCA, state.SCB, bias=bias)
- output = output.to(A_dtype)
-
+ delayed_bias = None
else: # apply bias separately
output = F.mm_dequant(out32, Sout32, SCA, state.SCB, bias=None)
- output = output.to(A_dtype).add_(bias)
+ delayed_bias = bias
# 4. Mixed-precision decomposition matmul
if coo_tensorA is not None and subA is not None:
- output += torch.matmul(subA, state.subB)
+ output.addmm_(subA, state.subB)
# 5. Save state
ctx.state = state
@@ -341,6 +340,9 @@ class MatMul8bitLt(torch.autograd.Function):
ctx.tensor_states = (None, None)
ctx.save_for_backward(None, None)
+ output = output.to(A_dtype)
+ if delayed_bias is not None:
+ output.add_(delayed_bias)
clone_func = torch.clone if len(output_shape) == 3 else lambda x : x
return clone_func(output.view(output_shape))