adaptation w4A8 quantization

python/sglang/srt/_custom_ops.py

@@ -5,6 +5,15 @@ from typing import List, Optional, Tuple
 import torch
 
 from sglang.srt.utils import get_bool_env_var, is_hip, is_hpu, is_npu
+try:
+    from lmslim import quant_ops 
+    from lmslim import quant_tools 
+except Exception:
+    print("INFO: Please install lmslim if you want to infer gptq or awq  or w8a8 model.\n") 
+try:
+    import lightop
+except Exception:
+    print("INFO: Please install lightop if you want to infer awq of marlin.\n") 
 
 logger = logging.getLogger(__name__)
 use_vllm_custom_allreduce = get_bool_env_var(
@@ -175,3 +184,25 @@ def mscclpp_allreduce(
     context: int, inp: torch.Tensor, out: torch.Tensor, nthreads: int, nblocks: int
 ) -> None:
     return sgl_kernel.allreduce.mscclpp_allreduce(context, inp, out, nthreads, nblocks)
+
+def triton_scaled_mm(a: torch.Tensor,
+                      b: torch.Tensor,
+                      scale_a: torch.Tensor,
+                      scale_b: torch.Tensor,
+                      out_dtype: torch.dtype,
+                      bias: Optional[torch.Tensor] = None,
+                      best_config:Optional[list] = None) -> torch.Tensor:
+
+    return quant_ops.triton_scaled_mm(a, b,scale_a,scale_b,out_dtype,bias,best_config)
+
+def triton_int8_gemm_helper(m: int,
+                             n: int,
+                             k: int,
+                             per_token_act_quant: bool,
+                             per_out_channel_weight_quant: bool,
+                             use_bias: bool,
+                             out_dtype: type[torch.dtype] = torch.float16,
+                             device: str = "cuda:0",
+                             best_config:Optional[list] = None,
+                             repeat:Optional[int] = 2):
+    return quant_tools.triton_int8_gemm_helper(m,n,k,per_token_act_quant,per_out_channel_weight_quant,use_bias,out_dtype,device,best_config,repeat)
\ No newline at end of file

python/sglang/srt/layers/quantization/slimquant_w4a8.py

+from typing import Any, Callable, Dict, List, Optional
+
+import torch
+from sglang.srt.layers.linear import set_weight_attrs
+from sglang.srt.distributed import get_tensor_model_parallel_world_size
+from torch.nn.parameter import Parameter
+from sglang.srt.layers.linear import LinearBase
+from sglang.srt.layers.quantization.base_config import LinearMethodBase, QuantizationConfig, QuantizeMethodBase, FusedMoEMethodBase
+from sglang.srt.layers.parameter import (
+    ChannelQuantScaleParameter,
+    _ColumnvLLMParameter,
+    RowvLLMParameter,
+)
+from lmslim.layers.gemm.int8_utils import (
+    per_token_group_quant_int8,
+    per_token_quant_int8)
+from sglang.srt import _custom_ops as ops
+from vllm.utils import W8a8GetCacheJSON
+from sglang.srt.layers.moe import MoeRunner, MoeRunnerBackend, MoeRunnerConfig
+
+import os
+
+class ModelWeightParameter(_ColumnvLLMParameter, RowvLLMParameter):
+    """
+    Parameter class for linear layer weights. Uses both column and
+    row parallelism.
+    """
+    pass
+
+W8A8_TRITONJSON=W8a8GetCacheJSON()
+
+def baseline_scaled_mm(a: torch.Tensor,
+                      b: torch.Tensor,
+                      scale_a: torch.Tensor,
+                      scale_b: torch.Tensor,
+                      out_dtype: torch.dtype,
+                      bias: Optional[torch.Tensor] = None) -> torch.Tensor:
+
+    scales= scale_a* scale_b.T
+    gemmout= torch.mm(
+        a.to(dtype=torch.float32), b.to(dtype=torch.float32))
+    output = (scales *gemmout).to(out_dtype)
+    if bias is not None:
+        output = output + bias
+    return output.to(out_dtype)
+
+
+class SlimQuantW4A8Int8Config(QuantizationConfig):
+    """Config class for W8A8 Int8 Quantization.
+
+    - Weight: static, per-channel, symmetric
+    - Activation: dynamic, per-token, symmetric
+    """
+
+    def __init__(self):
+        pass
+
+    @classmethod
+    def get_supported_act_dtypes(cls) -> List[torch.dtype]:
+        return [torch.float16, torch.bfloat16]
+
+    @classmethod
+    def get_min_capability(cls) -> int:
+        return 75
+
+    @classmethod
+    def get_name(self) -> str:
+        return "slimquant_w4a8"
+
+    @classmethod
+    def get_config_filenames(cls) -> List[str]:
+        return []
+
+    @classmethod
+    def from_config(cls, config: Dict[str, Any]) -> "SlimQuantW4A8Int8Config":
+        return cls()
+
+    def get_quant_method(
+        self,
+        layer: torch.nn.Module,
+        prefix: str,
+    ) -> Optional["QuantizeMethodBase"]:
+        from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+
+        if isinstance(layer, LinearBase):
+            return SlimQuantW4A8Int8LinearMethod(self)
+        elif isinstance(layer, FusedMoE):
+            return SlimQuantW4A8Int8MoEMethod(self)
+        return None
+
+    def get_scaled_act_names(self) -> List[str]:
+        return []
+
+
+class SlimQuantW4A8Int8LinearMethod(LinearMethodBase):
+
+    def __init__(self, quantization_config: SlimQuantW4A8Int8Config):
+        self.quantization_config = quantization_config
+        self.tritonsingleton= W8a8GetCacheJSON()
+        self.w8a8_strategy=int(os.getenv('W8A8_SUPPORT_METHODS', '1'))
+        
+    def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
+        n=layer.weight.shape[0]
+        k=layer.weight.shape[1]
+        
+        if self.w8a8_strategy==1:
+            if {n,k} not in self.tritonsingleton.weight_shapes:
+                self.tritonsingleton.weight_shapes.append({n,k})
+                json_file=self.tritonsingleton.get_w8a8json_name(n,k)
+                configs_dict=self.tritonsingleton.get_triton_cache(json_file,n,k)
+                
+                if configs_dict:
+                    self.tritonsingleton.triton_json_dict.update(configs_dict)
+                    
+                    for key, value in configs_dict.items():
+                        m=int(key.split('_')[0])
+                        ops.triton_int8_gemm_helper(m=m,n=n,k=k,per_token_act_quant=True,per_out_channel_weight_quant=True,use_bias=False,device=layer.weight.device,best_config=value)
+        else: 
+            weight_data=layer.weight.data
+            _weight=weight_data.T.contiguous().reshape(n,-1)
+            layer.weight.data=_weight
+            
+        layer.weight = Parameter(layer.weight.t(), requires_grad=False)
+        layer.weight_scale = Parameter(layer.weight_scale.data, requires_grad=False)
+
+    def create_weights(
+        self,
+        layer: torch.nn.Module,
+        input_size_per_partition: int,
+        output_partition_sizes: List[int],
+        input_size: int,
+        output_size: int,
+        params_dtype: torch.dtype,
+        **extra_weight_attrs,
+    ):
+
+        weight_loader = extra_weight_attrs.get("weight_loader")
+        self.logical_widths = output_partition_sizes
+
+        weight = ModelWeightParameter(
+            data=torch.empty(
+                sum(output_partition_sizes), input_size_per_partition, dtype=torch.int8
+            ),
+            input_dim=1,
+            output_dim=0,
+            weight_loader=weight_loader,
+        )
+        layer.register_parameter("weight", weight)
+
+        weight_scale = ChannelQuantScaleParameter(
+            data=torch.empty((sum(output_partition_sizes), 1), dtype=torch.float32),
+            output_dim=0,
+            weight_loader=weight_loader,
+        )
+        layer.register_parameter("weight_scale", weight_scale)
+
+    def apply(
+        self,
+        layer: torch.nn.Module,
+        x: torch.Tensor,
+        bias: Optional[torch.Tensor] = None,
+        input_quant_args: Optional[list[torch.Tensor]] = None,
+        silu_quant_args: Optional[list[torch.Tensor]] = None
+    ):
+        # if envs.USE_FUSED_RMS_QUANT and input_quant_args is not None:
+        #     assert len(input_quant_args) == 2
+        #     x_q, x_scale = input_quant_args
+        # elif envs.USE_FUSED_SILU_MUL_QUANT and silu_quant_args is not None:
+        #     x_q, x_scale = silu_quant_args
+        # else:
+        x_q, x_scale = per_token_quant_int8(x)
+
+        if self.w8a8_strategy==1:
+            m=x_q.shape[0]
+            k=x_q.shape[1]
+            n=layer.weight.shape[1]
+            
+            if len(W8A8_TRITONJSON.triton_json_dict)==0:
+                best_config=None
+                
+            elif f"1_{n}_{k}" in  W8A8_TRITONJSON.triton_json_dict:
+                if m<=16:
+                    m_=m
+                elif m<=64:
+                    m_= (m + 3) & -4 #取值到最近的4的倍数
+                elif m<=160:
+                    m_=(m + 7) & -8
+                    
+                elif m<200: #256
+                    m_=160
+                elif m<480: #512
+                    m_=256
+                elif m<960: #1024
+                    m_=512
+                elif m<2048:
+                    m_=1024
+                elif m<4096:
+                    m_=2048
+                elif m<6000:
+                    m_=4096
+                else:
+                    m_=8192  
+
+                best_config=W8A8_TRITONJSON.triton_json_dict[f"{m_}_{n}_{k}"]
+                
+            else: 
+                best_config=None
+                
+            #if best_config==None:
+            #    print("m:{},n:{},k:{}".format(m,n,k))
+            #    print("config not found!")
+
+            return ops.triton_scaled_mm(x_q,
+                                        layer.weight,
+                                        scale_a=x_scale,
+                                        scale_b=layer.weight_scale,
+                                        out_dtype=x.dtype,
+                                        bias=bias,best_config=best_config)
+        elif self.w8a8_strategy==2:
+            return ops.cutlass_scaled_mm(x_q,
+                                        layer.weight,
+                                        scale_a=x_scale,
+                                        scale_b=layer.weight_scale,
+                                        out_dtype=x.dtype,
+                                        bias=bias)
+        else:
+            return ops.rocblas_scaled_mm(x_q,
+                                        layer.weight,
+                                        scale_a=x_scale,
+                                        scale_b=layer.weight_scale,
+                                        out_dtype=x.dtype,
+                                        bias=bias) 
+
+
+class SlimQuantW4A8Int8MoEMethod:
+    """MoE method for W4A8INT8.
+    Supports loading INT8 checkpoints with static weight scale and
+    dynamic/static activation scale.
+    Also supports loading quantized FP16/BF16 model checkpoints with dynamic
+    activation scaling. The weight scaling factor will be initialized after
+    the model weights are loaded.
+    Args:
+        quant_config: The quantization config.
+    """
+
+    def __new__(cls, *args, **kwargs):
+        from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+
+        if not hasattr(cls, "_initialized"):
+            original_init = cls.__init__
+            new_cls = type(
+                cls.__name__,
+                (FusedMoEMethodBase,),
+                {
+                    "__init__": original_init,
+                    **{k: v for k, v in cls.__dict__.items() if k != "__dict__"},
+                },
+            )
+            obj = super(new_cls, new_cls).__new__(new_cls)
+            obj.__init__(*args, **kwargs)
+            return obj
+        return super().__new__(cls)
+
+    def __init__(self, quant_config):
+        self.quant_config = quant_config
+        self.tritonsingleton= W8a8GetCacheJSON()
+
+    def create_weights(
+        self,
+        layer: torch.nn.Module,
+        num_experts: int,
+        hidden_size: int,
+        intermediate_size: int,
+        params_dtype: torch.dtype,
+        **extra_weight_attrs,
+    ):
+        from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+        tp_size = get_tensor_model_parallel_world_size()
+
+        # WEIGHTS
+        w13_weight = torch.nn.Parameter(
+            torch.empty(
+                num_experts, 2 * intermediate_size, hidden_size//2, dtype=torch.int8
+            ),
+            requires_grad=False,
+        )
+        layer.register_parameter("w13_weight", w13_weight)
+        set_weight_attrs(w13_weight, extra_weight_attrs)
+
+        w2_weight = torch.nn.Parameter(
+            torch.empty(num_experts, hidden_size, intermediate_size//2, dtype=torch.int8),
+            requires_grad=False,
+        )
+        layer.register_parameter("w2_weight", w2_weight)
+        set_weight_attrs(w2_weight, extra_weight_attrs)
+
+        w13_weight_scale = torch.nn.Parameter(
+            torch.ones(num_experts, 2 * intermediate_size, 1, dtype=torch.float32),
+            requires_grad=False,
+        )
+        w2_weight_scale = torch.nn.Parameter(
+            torch.ones(num_experts, hidden_size, 1, dtype=torch.float32),
+            requires_grad=False,
+        )
+        layer.register_parameter("w13_weight_scale", w13_weight_scale)
+        layer.register_parameter("w2_weight_scale", w2_weight_scale)
+
+        extra_weight_attrs.update(
+            {"quant_method": FusedMoeWeightScaleSupported.CHANNEL.value}
+        )
+
+        set_weight_attrs(w13_weight_scale, extra_weight_attrs)
+        set_weight_attrs(w2_weight_scale, extra_weight_attrs)
+
+        w13_input_scale = None
+        layer.register_parameter("w13_input_scale", w13_input_scale)
+
+        w2_input_scale = None
+        layer.register_parameter("w2_input_scale", w2_input_scale)
+
+    def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
+        E=layer.w13_weight.shape[0]
+        N1=layer.w13_weight.shape[1]
+        N2=layer.w2_weight.shape[1]
+        K=N1//2
+        if [E,N1,N2,K] not in self.tritonsingleton.moe_weight_shapes:
+            self.tritonsingleton.moe_weight_shapes.append([E,N1,N2,K])
+            
+        TOPK= self.tritonsingleton.topk
+
+        json_file=self.tritonsingleton.get_moeint8json_name(E,N1,N2,K,TOPK,use_int4_w4a8=True)
+        configs_dict=self.tritonsingleton.get_moeint8_triton_cache(json_file,E,N1,N2,K,TOPK)
+        
+        #warmup
+        if configs_dict:
+            self.tritonsingleton.triton_moejson_dict.update(configs_dict)
+
+        layer.w13_weight = Parameter(layer.w13_weight, requires_grad=False)
+        layer.w2_weight = Parameter(layer.w2_weight, requires_grad=False)
+        layer.w13_weight_scale = Parameter(
+            layer.w13_weight_scale.data, requires_grad=False
+        )
+        layer.w2_weight_scale = Parameter(
+            layer.w2_weight_scale.data, requires_grad=False
+        )
+
+    def create_moe_runner(
+        self, layer: torch.nn.Module, moe_runner_config: MoeRunnerConfig
+    ):
+        self.moe_runner_config = moe_runner_config
+        self.runner = MoeRunner(MoeRunnerBackend.TRITON, moe_runner_config)
+
+    def apply(
+        self,
+        layer: torch.nn.Module,
+        x: torch.Tensor,
+        router_logits: torch.Tensor,
+        top_k: int,
+        renormalize: bool,
+        use_grouped_topk: bool = False,
+        topk_group: Optional[int] = None,
+        num_expert_group: Optional[int] = None,
+        global_num_experts: int = -1,
+        expert_map: Optional[torch.Tensor] = None,
+        custom_routing_function: Optional[Callable] = None,
+        scoring_func: str = "softmax",
+        e_score_correction_bias: Optional[torch.Tensor] = None,
+        apply_router_weight_on_input: bool = False,
+        activation: str = "silu",
+        enable_eplb: bool = False,
+        use_nn_moe: Optional[bool] = False,
+        routed_scaling_factor: Optional[float] = None,
+        use_fused_gate: Optional[bool] = False,
+        **_  
+    ) -> torch.Tensor:
+        from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+        from sglang.srt.layers.moe.fused_moe_triton.fused_moe import fused_experts
+        if enable_eplb:
+            raise NotImplementedError(
+                "EPLB not supported for `SlimQuantW4A8Int8MoEMethod` yet.")   
+        # Expert selection
+        topk_weights, topk_ids = FusedMoE.select_experts(
+            hidden_states=x,
+            router_logits=router_logits,
+            use_grouped_topk=use_grouped_topk,
+            top_k=top_k,
+            renormalize=renormalize,
+            topk_group=topk_group,
+            num_expert_group=num_expert_group,
+            custom_routing_function=custom_routing_function,
+            scoring_func=scoring_func,
+            e_score_correction_bias=e_score_correction_bias,
+            routed_scaling_factor=routed_scaling_factor,
+            use_fused_gate=use_fused_gate
+        )
+
+        return fused_experts(
+            x,
+            layer.w13_weight,
+            layer.w2_weight,
+            topk_weights=topk_weights,
+            topk_ids=topk_ids,
+            inplace=True,
+            use_int4_w4a8=True,
+            per_channel_quant=True,
+            activation=activation,
+            expert_map=expert_map,
+            apply_router_weight_on_input=apply_router_weight_on_input,
+            global_num_experts=global_num_experts,
+            w1_scale=(layer.w13_weight_scale),
+            w2_scale=(layer.w2_weight_scale),
+            a1_scale=layer.w13_input_scale,
+            a2_scale=layer.w2_input_scale,
+            use_nn_moe=use_nn_moe,
+        )

python/sglang/srt/layers/quantization/slimquant_w4a8_marlin.py

+from typing import Any, Callable, Dict, List, Optional
+from sglang.srt.layers.moe.token_dispatcher.base import CombineInput
+from sglang.srt.layers.moe.token_dispatcher.standard import StandardCombineInput, StandardDispatchOutput
+import torch
+from sglang.srt import _custom_ops as ops
+from sglang.srt.utils import set_weight_attrs
+from sglang.srt.distributed import get_tensor_model_parallel_world_size
+from torch.nn.parameter import Parameter
+from sglang.srt.layers.linear import LinearBase
+from sglang.srt.layers.quantization import QuantizationConfig
+from sglang.srt.layers.quantization.w4a8_utils import w4a8_weight_repack_impl
+from sglang.srt.layers.quantization.base_config import (FusedMoEMethodBase, QuantizeMethodBase)
+from sglang.srt.layers.quantization.slimquant_w4a8 import SlimQuantW4A8Int8LinearMethod
+from sglang.srt.layers.moe import MoeRunner, MoeRunnerBackend, MoeRunnerConfig
+
+try:
+    from lmslim.layers.fused_moe.fuse_moe_w4a8_marlin import fused_experts_impl_w4a8_marlin
+except Exception:
+    print("INFO: Please install lmslim if you want to infer the quantitative model of moe.\n")
+
+
+class MarlinMoeWorkspace:
+    """
+    Singleton manager for device-specific workspace buffers used by w4a8 Marlin-MoE.
+    global_reduce_buffer will take 1.5MB * cus (about 120MB for BW200) memoery in each device
+    """
+    _instances = {}
+    def __new__(cls, device):
+        if device not in cls._instances:
+            instance = super().__new__(cls)
+            instance._initialized = False
+            cls._instances[device] = instance
+        return cls._instances[device]
+
+    def __init__(self, device):
+        if self._initialized:
+            return
+        sms = torch.cuda.get_device_properties(device).multi_processor_count
+        self.workspace = torch.zeros(
+            500, dtype=torch.int, device=device, requires_grad=False
+        )
+        self.global_reduce_buffer = torch.zeros(
+            sms * 6 * 128 * 512, dtype=torch.int, device=device, requires_grad=False
+        )
+        self._initialized = True
+
+    def get_buffers(self):
+        return self.workspace, self.global_reduce_buffer
+
+def baseline_scaled_mm(a: torch.Tensor,
+                      b: torch.Tensor,
+                      scale_a: torch.Tensor,
+                      scale_b: torch.Tensor,
+                      out_dtype: torch.dtype,
+                      bias: Optional[torch.Tensor] = None) -> torch.Tensor:
+
+    scales= scale_a* scale_b.T
+    gemmout= torch.mm(
+        a.to(dtype=torch.float32), b.to(dtype=torch.float32))
+    output = (scales *gemmout).to(out_dtype)
+    if bias is not None:
+        output = output + bias
+    return output.to(out_dtype)
+
+
+class SlimQuantW4A8Int8MarlinConfig(QuantizationConfig):
+    """Config class for W4A8 Int8 Quantization.
+    - Weight: static, per-channel, symmetric
+    - Activation: dynamic, per-token, symmetric
+    """
+
+    def __init__(self):
+        pass
+
+    @classmethod
+    def get_supported_act_dtypes(cls) -> List[torch.dtype]:
+        return [torch.float16, torch.bfloat16]
+
+    @classmethod
+    def get_min_capability(cls) -> int:
+        return 75
+
+    @classmethod
+    def get_name(self) -> str:
+        return "slimquant_w4a8_marlin"
+
+    @classmethod
+    def get_config_filenames(cls) -> List[str]:
+        return []
+
+    @classmethod
+    def from_config(cls, config: Dict[str, Any]) -> "SlimQuantW4A8Int8MarlinConfig":
+        return cls()
+    @classmethod
+    def override_quantization_method(
+            cls, hf_quant_cfg, user_quant) -> Optional[str]:
+        if hf_quant_cfg.get("quant_method") == "slimquant_w4a8" \
+                and user_quant == "slimquant_w4a8_marlin":
+            return cls.get_name()
+        return None
+    def get_quant_method(
+        self,
+        layer: torch.nn.Module,
+        prefix: str,
+    ) -> Optional["QuantizeMethodBase"]:
+        from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+
+        if isinstance(layer, LinearBase):
+            return SlimQuantW4A8Int8LinearMethod(self)
+        elif isinstance(layer, FusedMoE):
+            return SlimQuantW4A8Int8MarlinMoEMethod(self)
+        return None
+
+    def get_scaled_act_names(self) -> List[str]:
+        return []
+
+
+class SlimQuantW4A8Int8MarlinMoEMethod:
+    """MoE method for W4A8INT8 Marlin.
+    Supports loading INT8 checkpoints with static weight scale and
+    dynamic/static activation scale.
+    Args:
+        quant_config: The quantization config.
+    """
+
+    def __new__(cls, *args, **kwargs):
+        from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+
+        if not hasattr(cls, "_initialized"):
+            original_init = cls.__init__
+            new_cls = type(
+                cls.__name__,
+                (FusedMoEMethodBase,),
+                {
+                    "__init__": original_init,
+                    **{k: v for k, v in cls.__dict__.items() if k != "__dict__"},
+                },
+            )
+            obj = super(new_cls, new_cls).__new__(new_cls)
+            obj.__init__(*args, **kwargs)
+            return obj
+        return super().__new__(cls)
+
+    def __init__(self, quant_config):
+        self.quant_config = quant_config
+
+    def create_weights(
+        self,
+        layer: torch.nn.Module,
+        num_experts: int,
+        hidden_size: int,
+        intermediate_size_per_partition: int,
+        params_dtype: torch.dtype,
+        **extra_weight_attrs,
+    ):
+        from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+        tp_size = get_tensor_model_parallel_world_size()
+        intermediate_size = intermediate_size_per_partition
+        # WEIGHTS
+        w13_weight = torch.nn.Parameter(
+            torch.empty(
+                num_experts, 2 * intermediate_size, hidden_size//2, dtype=torch.int8
+            ),
+            requires_grad=False,
+        )
+        layer.register_parameter("w13_weight", w13_weight)
+        set_weight_attrs(w13_weight, extra_weight_attrs)
+
+        w2_weight = torch.nn.Parameter(
+            torch.empty(num_experts, hidden_size, intermediate_size//2, dtype=torch.int8),
+            requires_grad=False,
+        )
+        layer.register_parameter("w2_weight", w2_weight)
+        set_weight_attrs(w2_weight, extra_weight_attrs)
+
+        w13_weight_scale = torch.nn.Parameter(
+            torch.ones(num_experts, 2 * intermediate_size, 1, dtype=torch.float32),
+            requires_grad=False,
+        )
+        w2_weight_scale = torch.nn.Parameter(
+            torch.ones(num_experts, hidden_size, 1, dtype=torch.float32),
+            requires_grad=False,
+        )
+        layer.register_parameter("w13_weight_scale", w13_weight_scale)
+        layer.register_parameter("w2_weight_scale", w2_weight_scale)
+
+        extra_weight_attrs.update(
+            {"quant_method": FusedMoeWeightScaleSupported.CHANNEL.value}
+        )
+
+        set_weight_attrs(w13_weight_scale, extra_weight_attrs)
+        set_weight_attrs(w2_weight_scale, extra_weight_attrs)
+
+        w13_input_scale = None
+        layer.register_parameter("w13_input_scale", w13_input_scale)
+
+        w2_input_scale = None
+        layer.register_parameter("w2_input_scale", w2_input_scale)
+
+    def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
+        layer.w13_weight_scale = Parameter(
+            layer.w13_weight_scale.data, requires_grad=False
+        )
+        layer.w2_weight_scale = Parameter(
+            layer.w2_weight_scale.data, requires_grad=False
+        )
+
+        layer.w13_weight = Parameter(w4a8_weight_repack_impl(layer.w13_weight), requires_grad=False)
+        layer.w2_weight = Parameter(w4a8_weight_repack_impl(layer.w2_weight), requires_grad=False)
+
+    def create_moe_runner(
+        self, layer: torch.nn.Module, moe_runner_config: MoeRunnerConfig
+    ):
+        self.moe_runner_config = moe_runner_config
+        self.runner = MoeRunner(MoeRunnerBackend.TRITON, moe_runner_config)
+
+
+    def apply(
+        self,
+        layer: torch.nn.Module,
+        dispatch_output: StandardDispatchOutput,
+    ) -> CombineInput:
+        x = dispatch_output.hidden_states
+        topk_output = dispatch_output.topk_output
+        from sglang.srt.layers.moe.topk import apply_topk_weights_cpu
+
+        topk_weights, topk_ids, _ = topk_output
+        x, topk_weights = apply_topk_weights_cpu(
+            self.moe_runner_config.apply_router_weight_on_input, topk_weights, x
+        )
+        workspace, global_reduce_buffer = MarlinMoeWorkspace(x.device).get_buffers()
+        output = fused_experts_impl_w4a8_marlin(
+            x,
+            layer.w13_weight,
+            layer.w2_weight,
+            topk_weights=topk_weights,
+            topk_ids=topk_ids,
+            workspace=workspace,
+            global_reduce_buffer=global_reduce_buffer,
+            inplace=True,
+            use_int4_w4a8=True,
+            per_channel_quant=True,
+            activation=layer.moe_runner_config.activation,
+            expert_map=layer.expert_map_gpu,
+            apply_router_weight_on_input=self.moe_runner_config.apply_router_weight_on_input,
+            global_num_experts=layer.moe_runner_config.num_experts,
+            w1_scale=(layer.w13_weight_scale),
+            w2_scale=(layer.w2_weight_scale),
+            a1_scale=layer.w13_input_scale,
+            a2_scale=layer.w2_input_scale,
+            use_nn_moe=False,
+        )
+        return StandardCombineInput(hidden_states=output)
+    # def _apply(
+    #     self,
+    #     layer: torch.nn.Module,
+    #     x: torch.Tensor,
+    #     router_logits: torch.Tensor,
+    #     top_k: int,
+    #     #renormalize: bool,
+    #     #use_grouped_topk: bool = False,
+    #     topk_group: Optional[int] = None,
+    #     num_expert_group: Optional[int] = None,
+    #     global_num_experts: int = -1,
+    #     expert_map: Optional[torch.Tensor] = None,
+    #     custom_routing_function: Optional[Callable] = None,
+    #     scoring_func: str = "softmax",
+    #     e_score_correction_bias: Optional[torch.Tensor] = None,
+    #     apply_router_weight_on_input: bool = False,
+    #     activation: str = "silu",
+    #     enable_eplb: bool = False,
+    #     use_nn_moe: Optional[bool] = False,
+    #     routed_scaling_factor: Optional[float] = None,
+    #     use_fused_gate: Optional[bool] = False,
+    #     **_  
+    # ) -> torch.Tensor:
+    #     from sglang.srt.layers.moe.fused_moe_triton import (FusedMoE, FusedMoeWeightScaleSupported)
+    #     from sglang.srt.layers.moe.fused_moe_triton.fused_moe import fused_experts
+    #     if enable_eplb:
+    #         raise NotImplementedError(
+    #             "EPLB not supported for `SlimQuantW4A8Int8MarlinMoEMethod` yet.")
+    #     # Expert selection
+    #     topk_weights, topk_ids = FusedMoE.select_experts(
+    #         hidden_states=x,
+    #         router_logits=router_logits,
+    #         #use_grouped_topk=use_grouped_topk,
+    #         top_k=top_k,
+    #         #renormalize=renormalize,
+    #         topk_group=topk_group,
+    #         num_expert_group=num_expert_group,
+    #         custom_routing_function=custom_routing_function,
+    #         scoring_func=scoring_func,
+    #         e_score_correction_bias=e_score_correction_bias,
+    #         routed_scaling_factor=routed_scaling_factor,
+    #         use_fused_gate=use_fused_gate
+    #     )
+    #     workspace, global_reduce_buffer = MarlinMoeWorkspace(x.device).get_buffers()
+    #     return fused_experts_impl_w4a8_marlin(
+    #         x,
+    #         layer.w13_weight,
+    #         layer.w2_weight,
+    #         topk_weights=topk_weights,
+    #         topk_ids=topk_ids,
+    #         workspace=workspace,
+    #         global_reduce_buffer=global_reduce_buffer,
+    #         inplace=True,
+    #         use_int4_w4a8=True,
+    #         per_channel_quant=True,
+    #         activation=activation,
+    #         expert_map=expert_map,
+    #         apply_router_weight_on_input=apply_router_weight_on_input,
+    #         global_num_experts=global_num_experts,
+    #         w1_scale=(layer.w13_weight_scale),
+    #         w2_scale=(layer.w2_weight_scale),
+    #         a1_scale=layer.w13_input_scale,
+    #         a2_scale=layer.w2_input_scale,
+    #         use_nn_moe=use_nn_moe,
+    #     )