Add K-EXAONE-236B-A23B (#31621)

Signed-off-by: lkm2835 <lkm2835@gmail.com>
Signed-off-by: Cyrus Leung <cyrus.tl.leung@gmail.com>
Co-authored-by: lgai-exaone <exaonemodels@lgresearch.ai>
Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

docs/models/supported_models.md

@@ -375,6 +375,7 @@ th {
 | `Ernie4_5ForCausalLM` | Ernie4.5 | `baidu/ERNIE-4.5-0.3B-PT`, etc. | ✅︎ | ✅︎ |
 | `Ernie4_5_MoeForCausalLM` | Ernie4.5MoE | `baidu/ERNIE-4.5-21B-A3B-PT`, `baidu/ERNIE-4.5-300B-A47B-PT`, etc. |✅︎| ✅︎ |
 | `ExaoneForCausalLM` | EXAONE-3 | `LGAI-EXAONE/EXAONE-3.0-7.8B-Instruct`, etc. | ✅︎ | ✅︎ |
+| `ExaoneMoeCausalLM` | K-EXAONE | `LGAI-EXAONE/K-EXAONE-236B-A23B`, etc. | | |
 | `Exaone4ForCausalLM` | EXAONE-4 | `LGAI-EXAONE/EXAONE-4.0-32B`, etc. | ✅︎ | ✅︎ |
 | `Fairseq2LlamaForCausalLM` | Llama (fairseq2 format) | `mgleize/fairseq2-dummy-Llama-3.2-1B`, etc. | ✅︎ | ✅︎ |
 | `FalconForCausalLM` | Falcon | `tiiuae/falcon-7b`, `tiiuae/falcon-40b`, `tiiuae/falcon-rw-7b`, etc. | | ✅︎ |

tests/models/registry.py

@@ -250,6 +250,9 @@ _TEXT_GENERATION_EXAMPLE_MODELS = {
         "LGAI-EXAONE/EXAONE-3.0-7.8B-Instruct", trust_remote_code=True
     ),
     "Exaone4ForCausalLM": _HfExamplesInfo("LGAI-EXAONE/EXAONE-4.0-32B"),
+    "ExaoneMoEForCausalLM": _HfExamplesInfo(
+        "LGAI-EXAONE/K-EXAONE-236B-A23B", min_transformers_version="5.0.0"
+    ),
     "Fairseq2LlamaForCausalLM": _HfExamplesInfo("mgleize/fairseq2-dummy-Llama-3.2-1B"),
     "FalconForCausalLM": _HfExamplesInfo("tiiuae/falcon-7b"),
     "FalconH1ForCausalLM": _HfExamplesInfo("tiiuae/Falcon-H1-0.5B-Base"),
@@ -1005,6 +1008,11 @@ _SPECULATIVE_DECODING_EXAMPLE_MODELS = {
         trust_remote_code=True,
         speculative_model="baidu/ERNIE-4.5-21B-A3B-PT",
     ),
+    "ExaoneMoeMTP": _HfExamplesInfo(
+        "LGAI-EXAONE/K-EXAONE-236B-A23B",
+        speculative_model="LGAI-EXAONE/K-EXAONE-236B-A23B",
+        min_transformers_version="5.0.0",
+    ),
     "Glm4MoeMTPModel": _HfExamplesInfo(
         "zai-org/GLM-4.5",
         speculative_model="zai-org/GLM-4.5",

vllm/config/speculative.py

@@ -33,6 +33,7 @@ MTPModelTypes = Literal[
     "mimo_mtp",
     "glm4_moe_mtp",
     "ernie_mtp",
+    "exaone_moe_mtp",
     "qwen3_next_mtp",
     "longcat_flash_mtp",
     "mtp",
@@ -219,6 +220,15 @@ class SpeculativeConfig:
             hf_config.update(
                 {"n_predict": n_predict, "architectures": ["Qwen3NextMTP"]}
             )
+
+        if hf_config.model_type == "exaone_moe":
+            hf_config.model_type = "exaone_moe_mtp"
+        if hf_config.model_type == "exaone_moe_mtp":
+            n_predict = getattr(hf_config, "num_nextn_predict_layers", None)
+            hf_config.update(
+                {"n_predict": n_predict, "architectures": ["ExaoneMoeMTP"]}
+            )
+
         if hf_config.model_type == "longcat_flash":
             hf_config.model_type = "longcat_flash_mtp"
             n_predict = getattr(hf_config, "num_nextn_predict_layers", 1)

vllm/model_executor/models/exaone4.py

@@ -72,6 +72,7 @@ class Exaone4GatedMLP(nn.Module):
         intermediate_size: int,
         hidden_act: str,
         quant_config: QuantizationConfig | None = None,
+        reduce_results: bool = True,
         bias: bool = False,
         prefix: str = "",
     ) -> None:
@@ -88,6 +89,7 @@ class Exaone4GatedMLP(nn.Module):
             output_size=hidden_size,
             bias=bias,
             quant_config=quant_config,
+            reduce_results=reduce_results,
             prefix=f"{prefix}.down_proj",
         )
         if hidden_act != "silu":

vllm/model_executor/models/exaone_moe.py

+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# ruff: noqa: E501
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Inference-only K-EXAONE-236B-A22B model compatible with HuggingFace weights."""
+
+import typing
+from collections.abc import Callable, Iterable
+from itertools import islice
+
+import torch
+from torch import nn
+from transformers import PretrainedConfig
+
+from vllm.compilation.decorators import support_torch_compile
+from vllm.config import CacheConfig, VllmConfig, get_current_vllm_config
+from vllm.distributed import (
+    get_ep_group,
+    get_pp_group,
+    get_tensor_model_parallel_world_size,
+)
+from vllm.model_executor.layers.fused_moe import FusedMoE
+from vllm.model_executor.layers.layernorm import RMSNorm
+from vllm.model_executor.layers.linear import ReplicatedLinear
+from vllm.model_executor.layers.logits_processor import LogitsProcessor
+from vllm.model_executor.layers.quantization import QuantizationConfig
+from vllm.model_executor.layers.vocab_parallel_embedding import (
+    DEFAULT_VOCAB_PADDING_SIZE,
+    ParallelLMHead,
+    VocabParallelEmbedding,
+)
+from vllm.model_executor.model_loader.weight_utils import (
+    default_weight_loader,
+    maybe_remap_kv_scale_name,
+)
+from vllm.sequence import IntermediateTensors
+
+from .exaone4 import Exaone4Attention as ExaoneMoeAttention
+from .exaone4 import Exaone4GatedMLP as ExaoneMoeGatedMLP
+from .interfaces import SupportsLoRA, SupportsPP
+from .utils import (
+    AutoWeightsLoader,
+    PPMissingLayer,
+    extract_layer_index,
+    is_pp_missing_parameter,
+    make_empty_intermediate_tensors_factory,
+    make_layers,
+    maybe_prefix,
+)
+
+
+class ExaoneMoe(nn.Module):
+    def __init__(
+        self,
+        config: PretrainedConfig,
+        quant_config: QuantizationConfig | None = None,
+        prefix: str = "",
+        enable_eplb: bool = False,
+    ):
+        super().__init__()
+        self.tp_size = get_tensor_model_parallel_world_size()
+
+        self.routed_scaling_factor = config.routed_scaling_factor
+
+        self.ep_group = get_ep_group().device_group
+        self.ep_rank = self.ep_group.rank()
+        self.ep_size = self.ep_group.size()
+        self.n_routed_experts = config.num_experts
+
+        if self.tp_size > config.num_experts:
+            raise ValueError(
+                f"Tensor parallel size {self.tp_size} is greater than "
+                f"the number of experts {config.num_experts}."
+            )
+
+        self.gate = ReplicatedLinear(
+            config.hidden_size,
+            config.num_experts,
+            bias=False,
+            quant_config=None,
+            prefix=f"{prefix}.gate",
+        )
+
+        self.e_score_correction_bias = nn.Parameter(
+            torch.empty(config.num_experts, dtype=torch.float32)
+        )
+
+        # Load balancing settings.
+        vllm_config = get_current_vllm_config()
+        eplb_config = vllm_config.parallel_config.eplb_config
+        self.enable_eplb = enable_eplb
+
+        self.n_logical_experts = self.n_routed_experts
+        eplb_config.num_redundant_experts = (
+            eplb_config.num_redundant_experts
+            if eplb_config.num_redundant_experts is not None
+            else 0
+        )
+        self.n_redundant_experts = eplb_config.num_redundant_experts
+        self.n_physical_experts = self.n_logical_experts + self.n_redundant_experts
+        self.n_local_physical_experts = self.n_physical_experts // self.ep_size
+
+        self.physical_expert_start = self.ep_rank * self.n_local_physical_experts
+        self.physical_expert_end = (
+            self.physical_expert_start + self.n_local_physical_experts
+        )
+
+        self.experts = FusedMoE(
+            num_experts=self.n_routed_experts,
+            top_k=config.num_experts_per_tok,
+            hidden_size=config.hidden_size,
+            intermediate_size=config.moe_intermediate_size,
+            reduce_results=False,
+            renormalize=config.norm_topk_prob,
+            quant_config=quant_config,
+            use_grouped_topk=True,
+            num_expert_group=config.n_group,
+            topk_group=config.topk_group,
+            prefix=f"{prefix}.experts",
+            scoring_func="sigmoid",
+            routed_scaling_factor=self.routed_scaling_factor,
+            e_score_correction_bias=self.e_score_correction_bias,
+            enable_eplb=self.enable_eplb,
+            num_redundant_experts=self.n_redundant_experts,
+        )
+
+        if getattr(config, "num_shared_experts", 0) > 0:
+            intermediate_size = config.moe_intermediate_size * config.num_shared_experts
+            self.shared_experts = ExaoneMoeGatedMLP(
+                hidden_size=config.hidden_size,
+                intermediate_size=intermediate_size,
+                hidden_act=config.hidden_act,
+                quant_config=quant_config,
+                reduce_results=self.experts.must_reduce_shared_expert_outputs(),
+                prefix=f"{prefix}.shared_experts",
+            )
+        else:
+            self.shared_experts = None
+
+    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
+        # NOTE: hidden_states can have either 1D or 2D shape.
+        orig_shape = hidden_states.shape
+        hidden_dim = hidden_states.shape[-1]
+        hidden_states = hidden_states.view(-1, hidden_dim)
+
+        # router_logits: (num_tokens, n_experts)
+        router_logits, _ = self.gate(hidden_states)
+
+        final_hidden_states = self.experts(
+            hidden_states=hidden_states, router_logits=router_logits
+        )
+
+        if self.shared_experts is not None:
+            shared_output = self.shared_experts(hidden_states)
+            final_hidden_states = final_hidden_states + shared_output
+
+        if self.tp_size > 1:
+            final_hidden_states = self.experts.maybe_all_reduce_tensor_model_parallel(  # noqa E501
+                final_hidden_states
+            )
+
+        return final_hidden_states.view(orig_shape)
+
+
+class ExaoneMoeDecoderLayer(nn.Module):
+    def __init__(
+        self,
+        config: PretrainedConfig,
+        cache_config: CacheConfig | None = None,
+        quant_config: QuantizationConfig | None = None,
+        mtp_layer: bool = None,
+        prefix: str = "",
+    ) -> None:
+        super().__init__()
+        layer_idx = extract_layer_index(prefix)
+        self.hidden_size = config.hidden_size
+        max_position_embeddings = getattr(config, "max_position_embeddings", 8192)
+        # Support abacusai/Smaug-72B-v0.1 with attention_bias
+        # Support internlm/internlm-7b with bias
+        attention_bias = getattr(config, "attention_bias", False) or getattr(
+            config, "bias", False
+        )
+
+        self.self_attn = ExaoneMoeAttention(
+            config=config,
+            hidden_size=self.hidden_size,
+            num_heads=config.num_attention_heads,
+            num_kv_heads=getattr(
+                config, "num_key_value_heads", config.num_attention_heads
+            ),
+            max_position_embeddings=max_position_embeddings,
+            quant_config=quant_config,
+            bias=attention_bias,
+            cache_config=cache_config,
+            prefix=f"{prefix}.self_attn",
+        )
+
+        if config.is_moe_layer[layer_idx] and not mtp_layer:
+            self.mlp = ExaoneMoe(
+                config=config, quant_config=quant_config, prefix=f"{prefix}.mlp"
+            )
+        else:
+            self.mlp = ExaoneMoeGatedMLP(
+                hidden_size=self.hidden_size,
+                intermediate_size=config.intermediate_size,
+                hidden_act=config.hidden_act,
+                quant_config=quant_config,
+                bias=getattr(config, "mlp_bias", False),
+                prefix=f"{prefix}.mlp",
+            )
+        self.input_layernorm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = RMSNorm(
+            config.hidden_size, eps=config.rms_norm_eps
+        )
+
+    def forward(
+        self,
+        positions: torch.Tensor,
+        hidden_states: torch.Tensor,
+        residual: torch.Tensor | None,
+    ) -> tuple[torch.Tensor, torch.Tensor]:
+        if residual is None:
+            residual = hidden_states
+            hidden_states = self.input_layernorm(hidden_states)
+        else:
+            hidden_states, residual = self.input_layernorm(hidden_states, residual)
+
+        # Self Attention
+        hidden_states = self.self_attn(
+            positions=positions,
+            hidden_states=hidden_states,
+        )
+
+        # Fully Connected
+        hidden_states, residual = self.post_attention_layernorm(hidden_states, residual)
+        hidden_states = self.mlp(hidden_states)
+
+        return hidden_states, residual
+
+
+@support_torch_compile
+class ExaoneMoeModel(nn.Module):
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
+        super().__init__()
+
+        config = vllm_config.model_config.hf_config
+        cache_config = vllm_config.cache_config
+        quant_config = vllm_config.quant_config
+        lora_config = vllm_config.lora_config
+        self.num_redundant_experts = (
+            vllm_config.parallel_config.eplb_config.num_redundant_experts
+        )
+
+        self.config = config
+        self.quant_config = quant_config
+        lora_vocab = (
+            (lora_config.lora_extra_vocab_size * (lora_config.max_loras or 1))
+            if lora_config
+            else 0
+        )
+        self.vocab_size = config.vocab_size + lora_vocab
+        if get_pp_group().is_first_rank or (
+            config.tie_word_embeddings and get_pp_group().is_last_rank
+        ):
+            self.embed_tokens = VocabParallelEmbedding(
+                self.vocab_size,
+                config.hidden_size,
+                org_num_embeddings=config.vocab_size,
+                quant_config=quant_config,
+            )
+        else:
+            self.embed_tokens = PPMissingLayer()
+        self.start_layer, self.end_layer, self.layers = make_layers(
+            config.num_hidden_layers,
+            lambda prefix: ExaoneMoeDecoderLayer(
+                config=config,
+                cache_config=cache_config,
+                quant_config=quant_config,
+                prefix=prefix,
+            ),
+            prefix=f"{prefix}.layers",
+        )
+        if get_pp_group().is_last_rank:
+            self.norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        else:
+            self.norm = PPMissingLayer()
+
+        self.make_empty_intermediate_tensors = make_empty_intermediate_tensors_factory(
+            ["hidden_states", "residual"], config.hidden_size
+        )
+
+    def embed_input_ids(self, input_ids: torch.Tensor) -> torch.Tensor:
+        return self.embed_tokens(input_ids)
+
+    def forward(
+        self,
+        input_ids: torch.Tensor | None,
+        positions: torch.Tensor,
+        intermediate_tensors: IntermediateTensors | None,
+        inputs_embeds: torch.Tensor | None = None,
+    ) -> torch.Tensor | IntermediateTensors:
+        if get_pp_group().is_first_rank:
+            if inputs_embeds is not None:
+                hidden_states = inputs_embeds
+            else:
+                hidden_states = self.embed_input_ids(input_ids)
+            residual = None
+        else:
+            assert intermediate_tensors is not None
+            hidden_states = intermediate_tensors["hidden_states"]
+            residual = intermediate_tensors["residual"]
+        for layer in islice(self.layers, self.start_layer, self.end_layer):
+            hidden_states, residual = layer(
+                positions,
+                hidden_states,
+                residual,
+            )
+        if not get_pp_group().is_last_rank:
+            return IntermediateTensors(
+                {"hidden_states": hidden_states, "residual": residual}
+            )
+
+        hidden_states, _ = self.norm(hidden_states, residual)
+        return hidden_states
+
+    def get_expert_mapping(self) -> list[tuple[str, str, int, str]]:
+        # Params for weights, fp8 weight scales, fp8 activation scales
+        # (param_name, weight_name, expert_id, shard_id)
+        return FusedMoE.make_expert_params_mapping(
+            ckpt_gate_proj_name="gate_proj",
+            ckpt_down_proj_name="down_proj",
+            ckpt_up_proj_name="up_proj",
+            num_experts=self.config.num_experts,
+            num_redundant_experts=self.num_redundant_experts,
+        )
+
+    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
+        stacked_params_mapping = [
+            # (param_name, shard_name, shard_id)
+            (".qkv_proj", ".q_proj", "q"),
+            (".qkv_proj", ".k_proj", "k"),
+            (".qkv_proj", ".v_proj", "v"),
+            (".gate_up_proj", ".gate_proj", 0),
+            (".gate_up_proj", ".up_proj", 1),
+        ]
+
+        # Skip loading extra parameters for GPTQ/modelopt models.
+        ignore_suffixes = (
+            ".bias",
+            "_bias",
+            ".k_scale",
+            "_k_scale",
+            ".v_scale",
+            "_v_scale",
+            ".weight_scale",
+            "_weight_scale",
+            ".input_scale",
+            "_input_scale",
+        )
+
+        params_dict = dict(self.named_parameters())
+        loaded_params: set[str] = set()
+        expert_params_mapping = self.get_expert_mapping()
+        for name, loaded_weight in weights:
+            if name.startswith("mtp."):
+                continue
+            if "rotary_emb.inv_freq" in name:
+                continue
+            if "rotary_emb.cos_cached" in name or "rotary_emb.sin_cached" in name:
+                # Models trained using ColossalAI may include these tensors in
+                # the checkpoint. Skip them.
+                continue
+            if self.quant_config is not None and (
+                scale_name := self.quant_config.get_cache_scale(name)
+            ):
+                # Loading kv cache quantization scales
+                param = params_dict[scale_name]
+                weight_loader = getattr(param, "weight_loader", default_weight_loader)
+                loaded_weight = (
+                    loaded_weight if loaded_weight.dim() == 0 else loaded_weight[0]
+                )
+                weight_loader(param, loaded_weight)
+                loaded_params.add(scale_name)
+                continue
+            for param_name, weight_name, shard_id in stacked_params_mapping:
+                if weight_name not in name:
+                    continue
+                if "mlp.experts" in name:
+                    continue
+                name = name.replace(weight_name, param_name)
+                # Skip loading extra bias for GPTQ models.
+                if name.endswith(".bias") and name not in params_dict:
+                    continue
+                if is_pp_missing_parameter(name, self):
+                    continue
+                if name not in params_dict:
+                    continue
+
+                param = params_dict[name]
+                weight_loader = param.weight_loader
+                weight_loader(param, loaded_weight, shard_id)
+                break
+            else:
+                is_expert_weight = False
+                for mapping in expert_params_mapping:
+                    param_name, weight_name, expert_id, shard_id = mapping
+                    if weight_name not in name:
+                        continue
+
+                    # Anyway, this is an expert weight and should not be
+                    # attempted to load as other weights later
+                    is_expert_weight = True
+
+                    # Do not modify `name` since the loop may continue here
+                    # Instead, create a new variable
+                    name_mapped = name.replace(weight_name, param_name)
+
+                    if is_pp_missing_parameter(name_mapped, self):
+                        continue
+
+                    # Skip loading extra parameters for GPTQ/modelopt models.
+                    if (
+                        name_mapped.endswith(ignore_suffixes)
+                        and name_mapped not in params_dict
+                    ):
+                        continue
+
+                    param = params_dict[name_mapped]
+                    # We should ask the weight loader to return success or not
+                    # here since otherwise we may skip experts with other
+                    # available replicas.
+                    weight_loader = typing.cast(
+                        Callable[..., bool], param.weight_loader
+                    )
+                    success = weight_loader(
+                        param,
+                        loaded_weight,
+                        name_mapped,
+                        shard_id=shard_id,
+                        expert_id=expert_id,
+                        return_success=True,
+                    )
+                    if success:
+                        name = name_mapped
+                        break
+                else:
+                    if is_expert_weight:
+                        continue
+                    # Skip loading extra bias for GPTQ models.
+                    if name.endswith(".bias") and name not in params_dict:
+                        continue
+                    # Skip loading extra parameters for GPTQ/modelopt models.
+                    if name.endswith(ignore_suffixes) and name not in params_dict:
+                        continue
+                    # Remapping the name of FP8 kv-scale.
+                    name = maybe_remap_kv_scale_name(name, params_dict)
+                    if name is None:
+                        continue
+
+                    if is_pp_missing_parameter(name, self):
+                        continue
+
+                    param = params_dict[name]
+                    weight_loader = getattr(
+                        param, "weight_loader", default_weight_loader
+                    )
+                    weight_loader(param, loaded_weight)
+            loaded_params.add(name)
+        return loaded_params
+
+
+class ExaoneMoeForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
+    packed_modules_mapping = {
+        "qkv_proj": [
+            "q_proj",
+            "k_proj",
+            "v_proj",
+        ],
+        "gate_up_proj": [
+            "gate_proj",
+            "up_proj",
+        ],
+    }
+
+    # LoRA specific attributes
+    embedding_modules = {
+        "embed_tokens": "input_embeddings",
+        "lm_head": "output_embeddings",
+    }
+    embedding_padding_modules = ["lm_head"]
+
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
+        super().__init__()
+        config = vllm_config.model_config.hf_config.get_text_config()
+        quant_config = vllm_config.quant_config
+        lora_config = vllm_config.lora_config
+
+        self.config = config
+        self.lora_config = lora_config
+        self.quant_config = quant_config
+
+        self.model = ExaoneMoeModel(
+            vllm_config=vllm_config,
+            prefix=maybe_prefix(prefix, "model"),
+        )
+        if get_pp_group().is_last_rank:
+            self.unpadded_vocab_size = config.vocab_size
+            if lora_config:
+                self.unpadded_vocab_size += lora_config.lora_extra_vocab_size
+            self.lm_head = ParallelLMHead(
+                self.unpadded_vocab_size,
+                config.hidden_size,
+                org_num_embeddings=config.vocab_size,
+                padding_size=DEFAULT_VOCAB_PADDING_SIZE
+                # We need bigger padding if using lora for kernel
+                # compatibility
+                if not lora_config
+                else lora_config.lora_vocab_padding_size,
+                quant_config=quant_config,
+            )
+            if config.tie_word_embeddings:
+                self.lm_head.weight = self.model.embed_tokens.weight
+
+            logit_scale = getattr(config, "logit_scale", 1.0)
+            self.logits_processor = LogitsProcessor(
+                self.unpadded_vocab_size, config.vocab_size, logit_scale
+            )
+        else:
+            self.lm_head = PPMissingLayer()
+
+        self.make_empty_intermediate_tensors = (
+            self.model.make_empty_intermediate_tensors
+        )
+
+    def embed_input_ids(self, input_ids: torch.Tensor) -> torch.Tensor:
+        return self.model.embed_input_ids(input_ids)
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        intermediate_tensors: IntermediateTensors | None = None,
+        inputs_embeds: torch.Tensor | None = None,
+    ) -> torch.Tensor | IntermediateTensors:
+        model_output = self.model(
+            input_ids, positions, intermediate_tensors, inputs_embeds
+        )
+        return model_output
+
+    def compute_logits(
+        self,
+        hidden_states: torch.Tensor,
+    ) -> torch.Tensor | None:
+        logits = self.logits_processor(self.lm_head, hidden_states)
+        return logits
+
+    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
+        loader = AutoWeightsLoader(
+            self,
+            # With tie_word_embeddings, we can skip lm_head.weight
+            # The weight might appear unnecessarily in the files if the model is
+            # processed with quantization, LoRA, fine-tuning, etc.
+            skip_prefixes=(
+                ["lm_head.", "mtp."] if self.config.tie_word_embeddings else ["mtp."]
+            ),
+        )
+        return loader.load_weights(weights)

vllm/model_executor/models/exaone_moe_mtp.py

+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+"""Inference-only ExaoneMoe MTP model."""
+
+from collections.abc import Iterable
+
+import torch
+from torch import nn
+
+from vllm.compilation.decorators import support_torch_compile
+from vllm.config import VllmConfig
+from vllm.distributed.parallel_state import get_pp_group
+from vllm.logger import init_logger
+from vllm.model_executor.layers.layernorm import RMSNorm
+from vllm.model_executor.layers.linear import ColumnParallelLinear
+from vllm.model_executor.layers.logits_processor import LogitsProcessor
+from vllm.model_executor.layers.vocab_parallel_embedding import (
+    ParallelLMHead,
+    VocabParallelEmbedding,
+)
+from vllm.model_executor.model_loader.weight_utils import default_weight_loader
+from vllm.model_executor.models.exaone_moe import ExaoneMoeDecoderLayer
+from vllm.sequence import IntermediateTensors
+
+from .utils import (
+    AutoWeightsLoader,
+    is_pp_missing_parameter,
+    maybe_prefix,
+)
+
+logger = init_logger(__name__)
+
+KVCache = tuple[torch.Tensor, torch.Tensor]
+
+
+@support_torch_compile
+class ExaoneMoeMultiTokenPredictor(nn.Module):
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
+        super().__init__()
+
+        model_config = vllm_config.model_config
+        quant_config = vllm_config.quant_config
+        lora_config = vllm_config.lora_config
+        config = model_config.hf_config
+
+        self.config = config
+        lora_vocab = (
+            (lora_config.lora_extra_vocab_size * (lora_config.max_loras or 1))
+            if lora_config
+            else 0
+        )
+        self.vocab_size = config.vocab_size + lora_vocab
+        self.org_vocab_size = config.vocab_size
+
+        self.mtp_start_layer_idx = config.num_hidden_layers
+        self.num_mtp_layers = getattr(config, "num_nextn_predict_layers", 1)
+
+        self.embed_tokens = VocabParallelEmbedding(
+            self.vocab_size,
+            config.hidden_size,
+            org_num_embeddings=config.vocab_size,
+        )
+
+        self.fc = ColumnParallelLinear(
+            self.config.hidden_size * 2,
+            self.config.hidden_size,
+            gather_output=True,
+            bias=False,
+            return_bias=False,
+            quant_config=quant_config,
+            prefix=f"{prefix}.fc",
+        )
+        self.layers = nn.ModuleList(
+            ExaoneMoeDecoderLayer(
+                vllm_config.model_config.hf_config,
+                quant_config=quant_config,
+                prefix=f"{prefix}.layers.{idx}",
+                mtp_layer=True,
+            )
+            for idx in range(self.num_mtp_layers)
+        )
+
+        self.norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.pre_fc_norm_hidden = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.pre_fc_norm_embedding = RMSNorm(
+            config.hidden_size, eps=config.rms_norm_eps
+        )
+
+    def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
+        return self.embed_tokens(input_ids)
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        hidden_states: torch.Tensor,
+        intermediate_tensors: IntermediateTensors | None = None,
+        inputs_embeds: torch.Tensor | None = None,
+        spec_step_idx: int = 0,
+    ) -> torch.Tensor:
+        if get_pp_group().is_first_rank:
+            if inputs_embeds is None:
+                inputs_embeds = self.get_input_embeddings(input_ids)
+            assert hidden_states.shape[-1] == inputs_embeds.shape[-1]
+            inputs_embeds = self.pre_fc_norm_embedding(inputs_embeds)
+            hidden_states = self.pre_fc_norm_hidden(hidden_states)
+            hidden_states = torch.cat([inputs_embeds, hidden_states], dim=-1)
+            hidden_states = self.fc(hidden_states)
+            residual = None
+        else:
+            assert intermediate_tensors is not None
+            hidden_states = intermediate_tensors["hidden_states"]
+            residual = intermediate_tensors["residual"]
+
+        current_step_idx = spec_step_idx % self.num_mtp_layers
+        hidden_states, residual = self.layers[current_step_idx](
+            positions=positions,
+            hidden_states=hidden_states,
+            residual=residual,
+        )
+
+        if not get_pp_group().is_last_rank:
+            return IntermediateTensors(
+                {"hidden_states": hidden_states, "residual": residual}
+            )
+
+        hidden_states, _ = self.norm(hidden_states, residual)
+        return hidden_states
+
+    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
+        stacked_params_mapping = [
+            # (param_name, shard_name, shard_id)
+            ("qkv_proj", "q_proj", "q"),
+            ("qkv_proj", "k_proj", "k"),
+            ("qkv_proj", "v_proj", "v"),
+            ("gate_up_proj", "gate_proj", 0),
+            ("gate_up_proj", "up_proj", 1),
+        ]
+
+        # Params for weights, fp8 weight scales, fp8 activation scales
+        # (param_name, weight_name, expert_id, shard_id)
+        params_dict = dict(self.named_parameters())
+        loaded_params: set[str] = set()
+        for name, loaded_weight in weights:
+            if "rotary_emb.inv_freq" in name:
+                continue
+
+            for param_name, weight_name, shard_id in stacked_params_mapping:
+                if weight_name not in name:
+                    continue
+
+                if "mlp.experts" in name:
+                    continue
+
+                name = name.replace(weight_name, param_name)
+                # Skip loading extra bias for GPTQ models.
+                if name.endswith(".bias") and name not in params_dict:
+                    continue
+                # Skip layers on other devices.
+                if is_pp_missing_parameter(name, self):
+                    continue
+                if name not in params_dict:
+                    continue
+                param = params_dict[name]
+                weight_loader = param.weight_loader
+                weight_loader(param, loaded_weight, shard_id)
+                break
+            else:
+                # Skip loading extra bias for GPTQ models.
+                if name.endswith(".bias") and name not in params_dict:
+                    continue
+                if is_pp_missing_parameter(name, self):
+                    continue
+
+                param = params_dict[name]
+                weight_loader = getattr(param, "weight_loader", default_weight_loader)
+                weight_loader(param, loaded_weight)
+            loaded_params.add(name)
+        return loaded_params
+
+
+@support_torch_compile
+class ExaoneMoeMTP(nn.Module):
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
+        config = vllm_config.model_config.hf_config
+        self.vllm_config = vllm_config
+        cache_config = vllm_config.cache_config
+        assert not cache_config.enable_prefix_caching, (
+            "ExaoneMoeMTP currently does not support prefix caching"
+        )
+
+        self.quant_config = vllm_config.quant_config
+
+        super().__init__()
+        self.config = config
+        self.model = ExaoneMoeMultiTokenPredictor(
+            vllm_config=vllm_config, prefix=maybe_prefix(prefix, "mtp")
+        )
+        self.unpadded_vocab_size = config.vocab_size
+        self.lm_head = ParallelLMHead(
+            self.unpadded_vocab_size,
+            config.hidden_size,
+            org_num_embeddings=config.vocab_size,
+            # padding_size=DEFAULT_VOCAB_PADDING_SIZE,
+            prefix=maybe_prefix(prefix, "lm_head"),
+        )
+        if config.tie_word_embeddings:
+            self.lm_head.weight = self.model.embed_tokens.weight
+        self.logits_processor = LogitsProcessor(
+            self.unpadded_vocab_size, config.vocab_size
+        )
+
+    def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
+        return self.model.get_input_embeddings(input_ids)
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        hidden_states: torch.Tensor,
+        intermediate_tensors: IntermediateTensors | None = None,
+        inputs_embeds: torch.Tensor | None = None,
+        spec_step_idx: int = 0,
+        **kwargs: object,
+    ):
+        hidden_states = self.model(
+            input_ids,
+            positions,
+            hidden_states,
+            intermediate_tensors,
+            inputs_embeds,
+            spec_step_idx,
+        )
+        return hidden_states
+
+    def compute_logits(
+        self,
+        hidden_states: torch.Tensor,
+        spec_step_idx: int = 0,
+    ) -> torch.Tensor | None:
+        return self.logits_processor(self.lm_head, hidden_states)
+
+    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
+        shared_weight_names = ["embed_tokens", "lm_head"]
+
+        def remap_weight_names(weights):
+            for name, weight in weights:
+                if name.startswith("mtp."):
+                    name = name.replace("mtp.", "model.")
+                elif not any(key in name for key in shared_weight_names):
+                    continue
+                yield name, weight
+
+        loader = AutoWeightsLoader(self)
+        return loader.load_weights(remap_weight_names(weights))

vllm/model_executor/models/registry.py

@@ -98,6 +98,7 @@ _TEXT_GENERATION_MODELS = {
     "Ernie4_5_MoeForCausalLM": ("ernie45_moe", "Ernie4_5_MoeForCausalLM"),
     "ExaoneForCausalLM": ("exaone", "ExaoneForCausalLM"),
     "Exaone4ForCausalLM": ("exaone4", "Exaone4ForCausalLM"),
+    "ExaoneMoEForCausalLM": ("exaone_moe", "ExaoneMoeForCausalLM"),
     "Fairseq2LlamaForCausalLM": ("fairseq2_llama", "Fairseq2LlamaForCausalLM"),
     "FalconForCausalLM": ("falcon", "FalconForCausalLM"),
     "FalconMambaForCausalLM": ("mamba", "MambaForCausalLM"),
@@ -457,6 +458,7 @@ _SPECULATIVE_DECODING_MODELS = {
     "EagleDeepSeekMTPModel": ("deepseek_eagle", "EagleDeepseekV3ForCausalLM"),
     "DeepSeekMTPModel": ("deepseek_mtp", "DeepSeekMTP"),
     "ErnieMTPModel": ("ernie_mtp", "ErnieMTP"),
+    "ExaoneMoeMTP": ("exaone_moe_mtp", "ExaoneMoeMTP"),
     "LongCatFlashMTPModel": ("longcat_flash_mtp", "LongCatFlashMTP"),
     "Glm4MoeMTPModel": ("glm4_moe_mtp", "Glm4MoeMTP"),
     "MedusaModel": ("medusa", "Medusa"),