revert cpu changes

Author: Devjiu

bitsandbytes/nn/modules.py

@@ -671,8 +671,9 @@ def to(self, *args, **kwargs):
         if device is not None and device.type != "meta" and self.data.device.type == "cpu":
             if device.type != "cpu" or self.data.dtype != torch.int8:
                 return self._quantize(device)
-            elif self.data.dtype == torch.int8 and device.type in ("cpu", "xpu") and (ipex_cpu or ipex_xpu):
-                self.CB = self.data
+            elif self.data.dtype == torch.int8:
+                if device.type == "cpu" or (device.type == "xpu" and ipex_xpu):
+                    self.CB = self.data
 
         new_param = Int8Params(
             super().to(device=device, dtype=dtype, non_blocking=non_blocking),

tests/test_functional.py

@@ -137,11 +137,10 @@ def test_dynamic_blockwise_quantization(self, device, dtype, nested, blocksize,
         abserr = sum(diffs) / len(diffs)
         relerr = sum(reldiffs) / len(reldiffs)
         if signed:
-            threshold_abserr = 0.0036 if device in ("cpu", "xpu") and (F.ipex_cpu or F.ipex_xpu) else 0.0035
             assert abserr < 0.0036
             assert relerr < 0.015
         else:
-            assert abserr < 0.00175 if device in ("cpu", "xpu") and (F.ipex_cpu or F.ipex_xpu) else 0.0023
+            assert abserr < 0.00175 if (device in "cpu") or (device in "xpu" and F.ipex_xpu) else 0.0023
             assert relerr < 0.012
         assert A2.dtype == dtype
 
@@ -172,8 +171,10 @@ def test_blockwise_cpu_large(self, hidden, blocksize):
     @pytest.mark.parametrize("bits", range(2, 9), ids=id_formatter("bits"))
     @pytest.mark.parametrize("method", ["linear", "fp8", "dynamic"])
     def test_few_bit_quant(self, device, bits, method):
-        if bits != 8 and (device == "cpu" or (device == "xpu" and F.ipex_xpu)):
-            pytest.skip("CPU/XPU implementation only supports 8 bits")
+        if device in "cpu" and bits != 8:
+            pytest.skip("CPU implementation only supports 8 bits")
+        if device in "xpu" and bits != 8 and F.ipex_xpu:
+            pytest.skip("XPU ipex implementation only supports 8 bits")
 
         abserrs = []
         relerrs = []