Support loading checkpoints quantized using Autofp8 (#286)

Support loading
https://huggingface.co/collections/neuralmagic/fp8-llms-for-vllm-666742ed2b78b7ac8df13127

Skip cuda checks
Use scaled_fp8_quant instead of _scaled_mm
Fix weights and weight_scale for guudi2 flot8_e4m3fn range.

---------

Co-authored-by: Nir David <ndavid@habana.ai>
Co-authored-by: Konrad Zawora <kzawora@habana.ai>

requirements-hpu.txt

@@ -6,4 +6,5 @@ ray == 2.32.0
 triton
 pandas
 tabulate
-vllm-hpu-extension @ git+https://github.com/HabanaAI/vllm-hpu-extension.git@0a7adab
+
+vllm-hpu-extension @ git+https://github.com/HabanaAI/vllm-hpu-extension.git@0a7adab

vllm/model_executor/layers/fused_moe/fused_moe.py

@@ -13,6 +13,10 @@
 from vllm.logger import init_logger
 from vllm.platforms import current_platform
 
+if current_platform.is_hpu():
+    from vllm_hpu_extension.ops import scaled_fp8_quant
+    ops.scaled_fp8_quant = scaled_fp8_quant
+
 logger = init_logger(__name__)
 
 

vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py

@@ -243,8 +243,10 @@ def _get_scheme_from_parts(
         # TODO @dsikka: clean-up conditions
         if is_activation_quantization_format(self.quant_format):
             if self._is_fp8_w8a8(weight_quant, input_quant):
-                is_fp8_w8a8_supported = self._check_scheme_supported(
-                    CompressedTensorsW8A8Fp8.get_min_capability(), error=False)
+                is_fp8_w8a8_supported = current_platform.is_hpu() or \
+                    self._check_scheme_supported(
+                    CompressedTensorsW8A8Fp8.get_min_capability(),
+                    error=False)
                 if is_fp8_w8a8_supported:
                     return CompressedTensorsW8A8Fp8(
                         strategy=weight_quant.strategy,
@@ -314,7 +316,8 @@ def get_scheme(
 
         # Raise error if device does not support the scheme
         # (e.g. fp8 needs ada lovelace)
-        self._check_scheme_supported(scheme.get_min_capability())
+        if not current_platform.is_hpu():
+            self._check_scheme_supported(scheme.get_min_capability())
 
         return scheme
 

vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w8a8_fp8.py

@@ -13,6 +13,7 @@
 from vllm.model_executor.parameter import (ChannelQuantScaleParameter,
                                            ModelWeightParameter,
                                            PerTensorScaleParameter)
+from vllm.platforms import current_platform
 from vllm.utils import is_hip
 
 __all__ = ["CompressedTensorsW8A8Fp8"]
@@ -23,7 +24,8 @@ class CompressedTensorsW8A8Fp8(CompressedTensorsScheme):
     def __init__(self, strategy: str, is_static_input_scheme: bool):
         self.strategy = strategy
         self.is_static_input_scheme = is_static_input_scheme
-        self.cutlass_fp8_supported = cutlass_fp8_supported()
+        self.cutlass_fp8_supported = not current_platform.is_hpu() and \
+                                     cutlass_fp8_supported()
 
     @classmethod
     def get_min_capability(cls) -> int:

vllm/model_executor/layers/quantization/fp8.py

@@ -28,6 +28,10 @@
 from vllm.platforms import current_platform
 from vllm.utils import is_hip, print_warning_once
 
+if current_platform.is_hpu():
+    from vllm_hpu_extension.ops import scaled_fp8_quant
+    ops.scaled_fp8_quant = scaled_fp8_quant
+
 ACTIVATION_SCHEMES = ["static", "dynamic"]
 
 logger = init_logger(__name__)
@@ -116,14 +120,18 @@ class Fp8LinearMethod(LinearMethodBase):
 
     def __init__(self, quant_config: Fp8Config):
         self.quant_config = quant_config
-        self.cutlass_fp8_supported = cutlass_fp8_supported()
-
-        # For GPUs that lack FP8 hardware support, we can leverage the Marlin
-        # kernel for fast weight-only FP8 quantization
-        self.use_marlin = (not current_platform.has_device_capability(89)
-                           or envs.VLLM_TEST_FORCE_FP8_MARLIN)
-        # Disable marlin for rocm
-        if is_hip():
+        if current_platform.is_cuda_alike():
+            self.cutlass_fp8_supported = cutlass_fp8_supported()
+
+            # For GPUs that lack FP8 hardware support, we can leverage the
+            # Marlin kernel for fast weight-only FP8 quantization
+            self.use_marlin = (not current_platform.has_device_capability(89)
+                               or envs.VLLM_TEST_FORCE_FP8_MARLIN)
+            # Disable marlin for rocm
+            if is_hip():
+                self.use_marlin = False
+        else:
+            self.cutlass_fp8_supported = False
             self.use_marlin = False
 
     def create_weights(

vllm/model_executor/layers/quantization/utils/w8a8_utils.py

@@ -10,6 +10,11 @@
 # from pytorch 2.5. Allocating a dummy tensor to pass as input_scale
 TORCH_DEVICE_IDENTITY = torch.ones(1).cuda() if is_hip() else None
 
+if current_platform.is_hpu():
+    import habana_frameworks.torch.utils.experimental as htexp
+    from vllm_hpu_extension.ops import scaled_fp8_quant
+    ops.scaled_fp8_quant = scaled_fp8_quant
+
 
 def cutlass_fp8_supported() -> bool:
     # cutlass is not supported on Rocm
@@ -25,7 +30,15 @@ def cutlass_fp8_supported() -> bool:
 def per_tensor_dequantize(
         tensor: torch.Tensor, inv_scale: Union[float,
                                                torch.Tensor]) -> torch.Tensor:
-    fake_qweight = tensor.to(torch.float16)
+    dtype = torch.float16
+    device = tensor.device
+    if current_platform.is_hpu():
+        dtype = torch.bfloat16
+        if htexp._get_device_type() == htexp.synDeviceType.synDeviceGaudi2:
+            #dequant on cpu to avoid nan on gaudi2
+            tensor = tensor.to('cpu')
+
+    fake_qweight = tensor.to(dtype).to(device)
     dq_weight = fake_qweight * inv_scale
     return dq_weight
 
@@ -58,7 +71,10 @@ def requantize_with_max_scale(
         logical_widths: List[int]) -> Tuple[torch.Tensor, torch.Tensor]:
     # Max scale to be used for requanitzation.
     max_w_scale = weight_scale.max()
-
+    if current_platform.is_hpu() and htexp._get_device_type(
+    ) == htexp.synDeviceType.synDeviceGaudi2:
+        max_w_scale = max_w_scale * (torch.finfo(torch.float8_e4m3fn).max /
+                                     torch.finfo(torch.float8_e4m3fnuz).max)
     # QKV / MLP is fused in the on disk checkpoint if any of the
     # weight scales are still set to the default since we initialize
     # N weight scales for N shards but we only load 1 weight scale
@@ -129,12 +145,20 @@ def apply_fp8_linear(
 
         if per_tensor_weights and per_tensor_activations:
             # Fused GEMM_DQ
-            output = torch._scaled_mm(qinput,
-                                      weight,
-                                      out_dtype=input.dtype,
-                                      scale_a=x_scale,
-                                      scale_b=weight_scale,
-                                      bias=bias)
+            if current_platform.is_hpu():
+                #hpu does not support torch._scaled_mm (SW-197036)
+                output = torch.ops.hpu.fp8_gemm_v2(qinput, False, weight,
+                                                   False, None, input.dtype,
+                                                   x_scale, weight_scale, None,
+                                                   False)
+            else:
+                output = torch._scaled_mm(qinput,
+                                          weight,
+                                          out_dtype=input.dtype,
+                                          scale_a=x_scale,
+                                          scale_b=weight_scale,
+                                          bias=bias)
+
             # A fix for discrepancy in scaled_mm which returns tuple
             # for torch < 2.5 and a single value in torch >= 2.5
             if type(output) is tuple and len(output) == 2:

vllm/worker/habana_model_runner.py

@@ -587,8 +587,7 @@ def _set_gc_threshold(self) -> None:
 
     def load_model(self) -> None:
         import habana_frameworks.torch.core as htcore
-        if self.model_config.quantization == 'inc':
-            htcore.hpu_set_env()
+        htcore.hpu_set_env()
         with HabanaMemoryProfiler() as m:
             with HabanaMemoryProfiler() as m_getmodel:
                 self.model = get_model(model_config=self.model_config,