From c47b6c85ac25ecb0a26dfff76c70a0b1a9a4a6bf Mon Sep 17 00:00:00 2001
From: zofia <110436990+zufangzhu@users.noreply.github.com>
Date: Thu, 13 Nov 2025 19:35:04 +0800
Subject: [PATCH] [XPU] add sym params to IPEXConfig (#28611)

Signed-off-by: Zhu, Zufang <zufang.zhu@intel.com>
---
 .../layers/quantization/ipex_quant.py         | 20 +++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/vllm/model_executor/layers/quantization/ipex_quant.py b/vllm/model_executor/layers/quantization/ipex_quant.py
index e0234191c62bf..5ca9167faec80 100644
--- a/vllm/model_executor/layers/quantization/ipex_quant.py
+++ b/vllm/model_executor/layers/quantization/ipex_quant.py
@@ -52,6 +52,7 @@ class IPEXConfig(QuantizationConfig):
         modules_to_not_convert: list[str] | None = None,
         desc_act: bool | None = None,
         lm_head_quantized: bool | None = None,
+        is_sym: bool | None = None,
     ) -> None:
         super().__init__()
         self.method = method
@@ -60,6 +61,7 @@ class IPEXConfig(QuantizationConfig):
         self.modules_to_not_convert = modules_to_not_convert or []
         self.desc_act = desc_act
         self.lm_head_quantized = lm_head_quantized
+        self.is_sym = is_sym
         self.pack_factor = 32 // self.weight_bits
 
         if self.weight_bits not in [4]:
@@ -108,15 +110,25 @@ class IPEXConfig(QuantizationConfig):
             modules_to_not_convert = cls.get_from_keys_or(
                 config, ["modules_to_not_convert"], None
             )
+            is_sym = not cls.get_from_keys_or(config, ["zero_point"], default=False)
             return cls(
-                method, weight_bits, group_size, modules_to_not_convert, False, False
+                method,
+                weight_bits,
+                group_size,
+                modules_to_not_convert,
+                False,
+                False,
+                is_sym,
             )
         # otherwise for gptq
         weight_bits = cls.get_from_keys(config, ["bits"])
         group_size = cls.get_from_keys(config, ["group_size"])
         lm_head_quantized = cls.get_from_keys_or(config, ["lm_head"], default=False)
         desc_act = cls.get_from_keys_or(config, ["desc_act"], default=False)
-        return cls(method, weight_bits, group_size, [], desc_act, lm_head_quantized)
+        is_sym = cls.get_from_keys_or(config, ["sym"], default=True)
+        return cls(
+            method, weight_bits, group_size, [], desc_act, lm_head_quantized, is_sym
+        )
 
     @classmethod
     def override_quantization_method(
@@ -180,6 +192,7 @@ class IPEXGPTQLinearMethod(GPTQLinearMethod):
         # The float activation will be quantized (dynamic, per-token) to INT8.
         act_quant_mode = ipex.quantization.WoqActQuantMode.PER_BATCH_IC_BLOCK
 
+        assert isinstance(self.quant_config, IPEXConfig)
         qconfig = ipex.quantization.get_weight_only_quant_qconfig_mapping(
             weight_dtype=weight_dtype,
             lowp_mode=lowp_mode,
@@ -200,6 +213,7 @@ class IPEXGPTQLinearMethod(GPTQLinearMethod):
                 bias=bias,
                 group_size=self.quant_config.group_size,
                 quant_method=IPEXConfig.IPEX_QUANT_METHOD_MAP["gptq"],
+                weight_qscheme="sym" if self.quant_config.is_sym else "asym",
             )
         )
 
@@ -250,6 +264,7 @@ class IPEXAWQLinearMethod(AWQLinearMethod):
         # The float activation will be quantized (dynamic, per-token) to INT8.
         act_quant_mode = ipex.quantization.WoqActQuantMode.PER_BATCH
 
+        assert isinstance(self.quant_config, IPEXConfig)
         qconfig = ipex.quantization.get_weight_only_quant_qconfig_mapping(
             weight_dtype=weight_dtype,
             lowp_mode=lowp_mode,
@@ -269,6 +284,7 @@ class IPEXAWQLinearMethod(AWQLinearMethod):
                 bias=bias,
                 group_size=self.quant_config.group_size,
                 quant_method=IPEXConfig.IPEX_QUANT_METHOD_MAP["awq"],  # type: ignore
+                weight_qscheme="sym" if self.quant_config.is_sym else "asym",
             )
         )