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Commit 9b7d307b authored by Tim Dettmers's avatar Tim Dettmers Committed by justheuristic
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bitsandbytes/autograd/_functions.py
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...@@ -381,7 +381,7 @@ class MatMul8bitLt(torch.autograd.Function): ...@@ -381,7 +381,7 @@ class MatMul8bitLt(torch.autograd.Function):
grad_A = F.mm_dequant(gradA32, SgradA32, SCgrad, state.SCBt).view(ctx.grad_shape).to(ctx.dtype_A) grad_A = F.mm_dequant(gradA32, SgradA32, SCgrad, state.SCBt).view(ctx.grad_shape).to(ctx.dtype_A)
elif state.CB is not None: elif state.CB is not None:
CB = state.CB.to(ctx.dtype_A, copy=True).mul_(state.SCB.unsqueeze(1).div(127.0)) CB = state.CB.to(ctx.dtype_A, copy=True).mul_(state.SCB.unsqueeze(1).mul(1. / 127.0))
grad_A = torch.matmul(grad_output, CB).view(ctx.grad_shape).to(ctx.dtype_A) grad_A = torch.matmul(grad_output, CB).view(ctx.grad_shape).to(ctx.dtype_A)
else: else:
raise Exception('State must contain either CBt or CB matrix for backward') raise Exception('State must contain either CBt or CB matrix for backward')
......
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