Add support for Intel Gaudi/HPU backend (#1662)

* supports hpu backend in main branch

* Update bitsandbytes/backends/hpu/ops.py

updates the assertion message
Co-authored-by: Matthew Douglas <38992547+matthewdouglas@users.noreply.github.com>

* Update bitsandbytes/backends/hpu/ops.py
Co-authored-by: Matthew Douglas <38992547+matthewdouglas@users.noreply.github.com>

* Update ops.py

Fix lint issue

* Update ops.py

---------
Co-authored-by: Matthew Douglas <38992547+matthewdouglas@users.noreply.github.com>

bitsandbytes/__init__.py

@@ -26,7 +26,7 @@ supported_torch_devices = {
     "cpu",
     "cuda",  # NVIDIA/AMD GPU
     "xpu",  # Intel GPU
-    "hpu",  # Gaudi
+    "hpu",  # Intel Gaudi
     "npu",  # Ascend NPU
     "mps",  # Apple Silicon
 }
@@ -37,6 +37,9 @@ if torch.cuda.is_available():
 if hasattr(torch, "xpu") and torch.xpu.is_available():
     from .backends.xpu import ops as xpu_ops
 
+if hasattr(torch, "hpu") and torch.hpu.is_available():
+    from .backends.hpu import ops as hpu_ops
+
 
 def _import_backends():
     """

bitsandbytes/autograd/_functions.py

@@ -451,7 +451,7 @@ def matmul_4bit(
         else:
             return MatMul4Bit.apply(A, B, out, bias, quant_state)
 
-    if A.numel() == A.shape[-1] and A.requires_grad == False:
+    if A.numel() == A.shape[-1] and A.requires_grad == False and A.device.type != "hpu":
         if A.shape[-1] % quant_state.blocksize != 0:
             warn(
                 f"Some matrices hidden dimension is not a multiple of {quant_state.blocksize} and efficient inference kernels are not supported for these (slow). Matrix input size found: {A.shape}",

bitsandbytes/backends/hpu/ops.py

+from collections.abc import Sequence
+import math
+
+import torch
+
+from bitsandbytes.utils import _reverse_4bit_compress_format
+
+from ..._ops import register_kernel
+from ..utils import GAUDI_SW_VER
+
+
+@register_kernel("bitsandbytes::dequantize_4bit", "hpu")
+def _(
+    A: torch.Tensor,
+    absmax: torch.Tensor,
+    blocksize: int,
+    quant_type: str,
+    shape: Sequence[int],
+    dtype: torch.dtype,
+) -> torch.Tensor:
+    torch._check_is_size(blocksize)
+    torch._check(quant_type == "nf4", lambda: f"quant_type must be nf4, got {quant_type}")
+    torch._check(
+        A.dtype in [torch.bfloat16, torch.uint8],
+        lambda: f"quant_storage supports uint8 or bfloat16, but got {A.dtype}",
+    )
+
+    # Enable non uint8 dtype
+    if A.dtype != torch.uint8:
+        A = A.view(torch.uint8)
+
+    transpose = False if len(A.shape) == 2 and A.shape[0] == 1 else True
+
+    A = A.reshape(-1)
+
+    if GAUDI_SW_VER and (GAUDI_SW_VER.major < 1 or GAUDI_SW_VER.minor < 22):
+        A = _reverse_4bit_compress_format(A)
+
+    # HPU dequantization function for NF4 quantized tensors.
+    out_dq = torch.ops.hpu.dequantize_nf4(
+        A,
+        absmax.to(dtype),
+        blocksize,
+        out_shape=(math.prod(shape),),
+        out_dtype=dtype,
+    )
+
+    output = out_dq.reshape(shape)
+
+    if transpose:
+        output = output.t()
+
+    return output

bitsandbytes/backends/utils.py

+import subprocess
+
+from packaging import version
 import torch
 
 try:
@@ -59,3 +62,23 @@ _FP4_QUANT_TABLE = torch.tensor(
     else "cpu",  # Only cpu/xpu use this table for now.
 )
 CODE = {"nf4": _NF4_QUANT_TABLE, "fp4": _FP4_QUANT_TABLE}
+
+
+def get_gaudi_sw_version():
+    """
+    Returns the installed version of Gaudi SW.
+    """
+    output = subprocess.run(
+        "pip list | grep habana-torch-plugin",
+        shell=True,
+        text=True,
+        capture_output=True,
+    )
+    # If grep return nothing
+    if not output.stdout.strip():
+        return None
+
+    return version.parse(output.stdout.split("\n")[0].split()[-1])
+
+
+GAUDI_SW_VER = get_gaudi_sw_version()

bitsandbytes/nn/modules.py

@@ -443,7 +443,7 @@ class Linear4bit(nn.Linear):
         )
         # self.persistent_buffers = []  # TODO consider as way to save quant state
         self.compute_dtype = compute_dtype
-        self.compute_type_is_set = False
+        self.compute_type_is_set = False if compute_dtype is None else True
         self.quant_state = None
         self.quant_storage = quant_storage
         self.ipex_linear_is_set = False