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safer cast

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This commit is contained in:
justheuristic 2022-09-18 00:24:20 +03:00
parent 5b169f18e4
commit 14048a3c16
1 changed files with 2 additions and 1 deletions
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3
bitsandbytes/autograd/_functions.py
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@ -371,7 +371,7 @@ class MatMul8bitLt(torch.autograd.Function):
gradB32, SgradB32 = F.igemmlt(C32grad, CxAt, Sgrad, SAt)
grad_B = F.mm_dequant(gradB32, SgradB32, SCgradt, SCAt).to(ctx.dtype_B)
if state.threshold > 0.0 and subA is not None:
grad_B[:, idx].addmm_(grad_output.t(), subA)
grad_B[:, idx] += torch.mm(grad_output.t(), subA)
if req_gradA:
if state.CBt is not None:
@ -384,6 +384,7 @@ class MatMul8bitLt(torch.autograd.Function):
grad_A = F.mm_dequant(gradA32, SgradA32, SCgrad, state.SCBt).view(ctx.grad_shape).to(ctx.dtype_A)
elif state.CB is not None:
raise NotImplementedError("WIP")
CB = state.CB.to(ctx.dtype_B)
CB.mul_(state.SCB.unsqueeze(1).div_(127.0).to(CB.dtype))
grad_A = torch.matmul(grad_output, CB).view(ctx.grad_shape).to(ctx.dtype_A)