fix doc

bitsandbytes/backends/cpu/ops.py

@@ -1,6 +1,5 @@
 from collections.abc import Sequence
 import ctypes as ct
-import warnings
 
 import torch
 
@@ -119,7 +118,3 @@ def _(
             shape,
             dtype,
         )
-else:
-    warnings.warn(
-        "You can install intel_extension_for_pytorch to get better performance on NF4 if you are using Intel CPUs."
-    )

bitsandbytes/backends/xpu/ops.py

@@ -57,13 +57,6 @@ def _dequantize_4bit_impl(
 def _dequantize_blockwise_impl(
     A: torch.Tensor, absmax: torch.Tensor, code: torch.Tensor, blocksize: int, dtype: torch.dtype, out: torch.Tensor
 ) -> None:
-    # torch._check(blocksize in [4096, 2048, 1024, 512, 256, 128, 64])
-    # torch._check(A.dtype == torch.uint8, lambda: f"A must be uint8, got {A.dtype}")
-    # torch._check(
-    #     dtype in [torch.float16, torch.bfloat16, torch.float32],
-    #     lambda: f"Blockwise dequantization only supports 16bit/32bit floating types, got {dtype}",
-    # )
-
     args = (
         get_ptr(code),
         get_ptr(A),

docs/source/installation.mdx

@@ -237,24 +237,16 @@ pip install -e .   # `-e` for "editable" install, when developing BNB (otherwise
 
 #### Intel CPU + XPU
 
-
-If you are using Intel CPU on Linux or Intel XPU on Linux/Windows, please follow the [instruction](https://pytorch-extension.intel.com/) or the following command to install intel_extension_for_pytorch so you can get better performance.
-
-CPU: `pip install intel_extension_for_pytorch`
-XPU: `pip install intel_extension_for_pytorch --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/`
-
-Install bitsandbytes:
-CPU: Need to build CPU C++ codes
+CPU needs to build CPU C++ codes, while xpu needs to build sycl codes.
+Run `export bnb_device=xpu` if you are using xpu, run `export bnb_device=cpu` if you are using cpu.
 ```
 git clone https://github.com/bitsandbytes-foundation/bitsandbytes.git && cd bitsandbytes/
-cmake -DCOMPUTE_BACKEND=cpu -S .
+cmake -DCOMPUTE_BACKEND=$bnb_device -S .
 make
-pip install .
-```
-XPU:
-```
-pip install git+https://github.com/bitsandbytes-foundation/bitsandbytes.git
+pip install -e .
 ```
+Note: You can run `pip install intel_extension_for_pytorch to get better performance on CPU`
+
 
 </hfoption>
 <hfoption id="Ascend NPU">