fix a bug in quantize_no_absmax and dequantize_no_absmax with multiple gpus

bitsandbytes/functional.py

@@ -656,9 +656,11 @@ def quantize_no_absmax(A: Tensor, code: Tensor, out: Tensor = None) -> Tensor:
     torch.Tensor:
         Quantized 8-bit tensor.
     '''
+    prev_device = pre_call(A.device)
     if out is None: out = torch.zeros_like(A, dtype=torch.uint8)
     is_on_gpu([A, out])
     lib.cquantize(get_ptr(code), get_ptr(A), get_ptr(out), ct.c_int(A.numel()))
+    post_call(prev_device)
     return out
 
 
@@ -683,9 +685,11 @@ def dequantize_no_absmax(A: Tensor, code: Tensor, out: Tensor = None) -> Tensor:
     torch.Tensor:
         32-bit output tensor.
     '''
+    prev_device = pre_call(A.device)
     if out is None: out = torch.zeros_like(A, dtype=torch.float32)
     is_on_gpu([code, A, out])
     lib.cdequantize(get_ptr(code), get_ptr(A), get_ptr(out), ct.c_int(A.numel()))
+    post_call(prev_device)
     return out