| 1 | # SPDX-License-Identifier: Apache-2.0 |
| 2 | # SPDX-FileCopyrightText: Copyright contributors to the vLLM project |
| 3 | |
| 4 | |
| 5 | import typing |
| 6 | from collections.abc import Callable, Iterable |
| 7 | |
| 8 | import torch |
| 9 | import torch.nn as nn |
| 10 | |
| 11 | from vllm.config import VllmConfig |
| 12 | from vllm.distributed import tensor_model_parallel_all_reduce |
| 13 | from vllm.model_executor.layers.fused_moe import ( |
| 14 | fused_moe_make_expert_params_mapping, |
| 15 | ) |
| 16 | from vllm.model_executor.layers.fused_moe.utils import ( |
| 17 | is_model_fused_shared_expert_compatible, |
| 18 | ) |
| 19 | from vllm.model_executor.layers.layernorm import RMSNorm |
| 20 | from vllm.model_executor.layers.logits_processor import LogitsProcessor |
| 21 | from vllm.model_executor.layers.vocab_parallel_embedding import ( |
| 22 | VocabParallelEmbedding, |
| 23 | ) |
| 24 | from vllm.model_executor.model_loader.weight_utils import ( |
| 25 | default_weight_loader, |
| 26 | maybe_remap_kv_scale_name, |
| 27 | ) |
| 28 | from vllm.model_executor.models.deepseek_mtp import SharedHead |
| 29 | from vllm.model_executor.models.deepseek_v2 import ( |
| 30 | DeepseekV2MixtureOfExperts, |
| 31 | DeepseekV2MoE, |
| 32 | _try_load_fp8_indexer_wk, |
| 33 | get_spec_layer_idx_from_weight_name, |
| 34 | ) |
| 35 | from vllm.model_executor.models.interfaces import SupportsPP |
| 36 | from vllm.model_executor.models.utils import ( |
| 37 | get_pp_missing_layer_names, |
| 38 | make_empty_intermediate_tensors_factory, |
| 39 | maybe_prefix, |
| 40 | ) |
| 41 | from vllm.models.deepseek_v32.common.kernels import fused_eh_norm |
| 42 | from vllm.platforms import current_platform |
| 43 | from vllm.sequence import IntermediateTensors |
| 44 | |
| 45 | from .model import DeepseekV32DecoderLayer |
| 46 | |
| 47 | |
| 48 | class DeepseekV32MultiTokenPredictorLayer(nn.Module): |
| 49 | def __init__(self, vllm_config: VllmConfig, prefix: str) -> None: |
| 50 | super().__init__() |
| 51 | assert vllm_config.speculative_config is not None |
| 52 | config = vllm_config.speculative_config.draft_model_config.hf_config |
| 53 | self.config = config |
| 54 | quant_config = vllm_config.quant_config |
| 55 | |
| 56 | self.enorm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps) |
| 57 | self.hnorm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps) |
| 58 | self.eh_proj = nn.Linear(config.hidden_size * 2, config.hidden_size, bias=False) |
| 59 | |
| 60 | topk_indices_buffer = torch.empty( |
| 61 | vllm_config.scheduler_config.max_num_batched_tokens, |
| 62 | config.index_topk, |
| 63 | dtype=torch.int32, |
| 64 | device=current_platform.device_type, |
| 65 | ) |
| 66 | self.shared_head = SharedHead( |
| 67 | config=config, prefix=prefix, quant_config=quant_config |
| 68 | ) |
| 69 | self.mtp_block = DeepseekV32DecoderLayer( |
| 70 | vllm_config, |
| 71 | prefix, |
| 72 | config=config, |
| 73 | topk_indices_buffer=topk_indices_buffer, |
| 74 | ) |
| 75 | |
| 76 | def forward( |
| 77 | self, |
| 78 | input_ids: torch.Tensor, |
| 79 | positions: torch.Tensor, |
| 80 | previous_hidden_states: torch.Tensor, |
| 81 | inputs_embeds: torch.Tensor | None = None, |
| 82 | spec_step_index: int = 0, |
| 83 | ) -> torch.Tensor: |
| 84 | assert inputs_embeds is not None |
| 85 | eh_input = fused_eh_norm( |
| 86 | positions, |
| 87 | inputs_embeds, |
| 88 | previous_hidden_states, |
| 89 | self.enorm.weight, |
| 90 | self.hnorm.weight, |
| 91 | self.enorm.variance_epsilon, |
| 92 | ) |
| 93 | hidden_states = self.eh_proj(eh_input) |
| 94 | hidden_states, residual = self.mtp_block( |
| 95 | positions=positions, hidden_states=hidden_states, residual=None |
| 96 | ) |
| 97 | hidden_states = tensor_model_parallel_all_reduce(hidden_states) |
| 98 | hidden_states = residual + hidden_states |
| 99 | hidden_states = self.shared_head.norm(hidden_states) |
| 100 | return hidden_states, hidden_states |
| 101 | |
| 102 | |
| 103 | class DeepseekV32MultiTokenPredictor(nn.Module): |
| 104 | def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""): |
| 105 | super().__init__() |
| 106 | config = vllm_config.model_config.hf_config |
| 107 | self.mtp_start_layer_idx = config.num_hidden_layers |
| 108 | self.num_mtp_layers = config.num_nextn_predict_layers |
| 109 | self.layers = torch.nn.ModuleDict( |
| 110 | { |
| 111 | str(idx): DeepseekV32MultiTokenPredictorLayer( |
| 112 | vllm_config, f"{prefix}.layers.{idx}" |
| 113 | ) |
| 114 | for idx in range( |
| 115 | self.mtp_start_layer_idx, |
| 116 | self.mtp_start_layer_idx + self.num_mtp_layers, |
| 117 | ) |
| 118 | } |
| 119 | ) |
| 120 | self.embed_tokens = VocabParallelEmbedding( |
| 121 | config.vocab_size, |
| 122 | config.hidden_size, |
| 123 | prefix=maybe_prefix(prefix, "embed_tokens"), |
| 124 | ) |
| 125 | self.logits_processor = LogitsProcessor(config.vocab_size) |
| 126 | |
| 127 | def set_skip_topk(self, skip: bool): |
| 128 | for layer in self.layers.values(): |
| 129 | self_attn = getattr(layer.mtp_block, "self_attn", None) |
| 130 | if self_attn is not None and hasattr(self_attn, "skip_topk"): |
| 131 | self_attn.skip_topk = skip |
| 132 | |
| 133 | def compact_topk_indices(self, slot_ids: torch.Tensor): |
| 134 | """Gather the top-k index rows at ``slot_ids`` to the front of the buffer.""" |
| 135 | num_slots = slot_ids.numel() |
| 136 | for layer in self.layers.values(): |
| 137 | self_attn = getattr(layer.mtp_block, "self_attn", None) |
| 138 | if self_attn is not None and hasattr(self_attn, "topk_indices_buffer"): |
| 139 | topk_indices_buffer = self_attn.topk_indices_buffer |
| 140 | topk_indices_buffer[:num_slots] = topk_indices_buffer[slot_ids] |
| 141 | |
| 142 | def embed_input_ids(self, input_ids: torch.Tensor) -> torch.Tensor: |
| 143 | return self.embed_tokens(input_ids) |
| 144 | |
| 145 | def forward( |
| 146 | self, |
| 147 | input_ids: torch.Tensor, |
| 148 | positions: torch.Tensor, |
| 149 | previous_hidden_states: torch.Tensor, |
| 150 | inputs_embeds: torch.Tensor | None = None, |
| 151 | spec_step_idx: int = 0, |
| 152 | ) -> torch.Tensor: |
| 153 | if inputs_embeds is None: |
| 154 | inputs_embeds = self.embed_tokens(input_ids) |
| 155 | current_step_idx = spec_step_idx % self.num_mtp_layers |
| 156 | return self.layers[str(self.mtp_start_layer_idx + current_step_idx)]( |
| 157 | input_ids, |
| 158 | positions, |
| 159 | previous_hidden_states, |
| 160 | inputs_embeds, |
| 161 | current_step_idx, |
| 162 | ) |
| 163 | |
| 164 | def compute_logits( |
| 165 | self, |
| 166 | hidden_states: torch.Tensor, |
| 167 | spec_step_idx: int = 0, |
| 168 | ) -> torch.Tensor: |
| 169 | current_step_idx = spec_step_idx % self.num_mtp_layers |
| 170 | mtp_layer = self.layers[str(self.mtp_start_layer_idx + current_step_idx)] |
| 171 | return self.logits_processor(mtp_layer.shared_head.head, hidden_states) |
| 172 | |
| 173 | |
| 174 | class DeepseekV32MTP(nn.Module, DeepseekV2MixtureOfExperts, SupportsPP): |
| 175 | def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""): |
| 176 | super().__init__() |
| 177 | self.config = vllm_config.model_config.hf_config |
| 178 | self.quant_config = vllm_config.quant_config |
| 179 | self.model = DeepseekV32MultiTokenPredictor( |
| 180 | vllm_config=vllm_config, prefix=maybe_prefix(prefix, "model") |
| 181 | ) |
| 182 | self.set_moe_parameters() |
| 183 | self.make_empty_intermediate_tensors = make_empty_intermediate_tensors_factory( |
| 184 | ["hidden_states", "residual"], self.config.hidden_size |
| 185 | ) |
| 186 | self.is_fused_shared_expert_enabled = is_model_fused_shared_expert_compatible( |
| 187 | self.model.layers.values(), |
| 188 | DeepseekV2MoE, |
| 189 | "mtp_block.mlp", |
| 190 | ) |
| 191 | |
| 192 | def set_moe_parameters(self): |
| 193 | self.num_moe_layers = self.config.num_nextn_predict_layers |
| 194 | self.num_expert_groups = self.config.n_group |
| 195 | self.moe_layers = [] |
| 196 | self.moe_mlp_layers = [] |
| 197 | example_moe = None |
| 198 | for layer in self.model.layers.values(): |
| 199 | mlp = layer.mtp_block.mlp |
| 200 | if isinstance(mlp, DeepseekV2MoE): |
| 201 | example_moe = mlp |
| 202 | self.moe_mlp_layers.append(mlp) |
| 203 | self.moe_layers.append(mlp.experts) |
| 204 | self.extract_moe_parameters(example_moe) |
| 205 | |
| 206 | def embed_input_ids(self, input_ids: torch.Tensor) -> torch.Tensor: |
| 207 | return self.model.embed_input_ids(input_ids) |
| 208 | |
| 209 | def forward( # type: ignore[override] |
| 210 | self, |
| 211 | input_ids: torch.Tensor | None, |
| 212 | positions: torch.Tensor, |
| 213 | hidden_states: torch.Tensor, |
| 214 | intermediate_tensors: IntermediateTensors | None = None, |
| 215 | inputs_embeds: torch.Tensor | None = None, |
| 216 | spec_step_idx: int = 0, |
| 217 | ) -> torch.Tensor: |
| 218 | return self.model( |
| 219 | input_ids, positions, hidden_states, inputs_embeds, spec_step_idx |
| 220 | ) |
| 221 | |
| 222 | def compute_logits( |
| 223 | self, |
| 224 | hidden_states: torch.Tensor, |
| 225 | spec_step_idx: int = 0, |
| 226 | ) -> torch.Tensor | None: |
| 227 | return self.model.compute_logits(hidden_states, spec_step_idx) |
| 228 | |
| 229 | def _rewrite_spec_layer_name(self, spec_layer: int, name: str) -> str: |
| 230 | spec_layer_weight_names = [ |
| 231 | "embed_tokens", |
| 232 | "enorm", |
| 233 | "hnorm", |
| 234 | "eh_proj", |
| 235 | "shared_head", |
| 236 | ] |
| 237 | shared_weight_names = ["embed_tokens"] |
| 238 | spec_layer_weight = False |
| 239 | shared_weight = False |
| 240 | for weight_name in spec_layer_weight_names: |
| 241 | if weight_name in name: |
| 242 | spec_layer_weight = True |
| 243 | if weight_name in shared_weight_names: |
| 244 | shared_weight = True |
| 245 | break |
| 246 | if not spec_layer_weight: |
| 247 | name = name.replace( |
| 248 | f"model.layers.{spec_layer}.", f"model.layers.{spec_layer}.mtp_block." |
| 249 | ) |
| 250 | elif shared_weight: |
| 251 | name = name.replace(f"model.layers.{spec_layer}.", "model.") |
| 252 | return name |
| 253 | |
| 254 | def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]: |
| 255 | stacked_params_mapping = [ |
| 256 | ("gate_up_proj", "gate_proj", 0), |
| 257 | ("gate_up_proj", "up_proj", 1), |
| 258 | ("fused_qkv_a_proj", "q_a_proj", 0), |
| 259 | ("fused_qkv_a_proj", "kv_a_proj_with_mqa", 1), |
| 260 | ("wk_weights_proj", "wk", 0), |
| 261 | ("wk_weights_proj", "weights_proj", 1), |
| 262 | ] |
| 263 | expert_params_mapping = fused_moe_make_expert_params_mapping( |
| 264 | self, |
| 265 | ckpt_gate_proj_name="gate_proj", |
| 266 | ckpt_down_proj_name="down_proj", |
| 267 | ckpt_up_proj_name="up_proj", |
| 268 | num_experts=self.config.n_routed_experts |
| 269 | + ( |
| 270 | self.config.n_shared_experts |
| 271 | if self.is_fused_shared_expert_enabled |
| 272 | else 0 |
| 273 | ), |
| 274 | ) |
| 275 | |
| 276 | pp_missing_layer_names = get_pp_missing_layer_names(self) |
| 277 | params_dict = dict(self.named_parameters()) |
| 278 | loaded_params: set[str] = set() |
| 279 | _pending_wk_fp8: dict = {} |
| 280 | for name, loaded_weight in weights: |
| 281 | if "rotary_emb.inv_freq" in name: |
| 282 | continue |
| 283 | spec_layer = get_spec_layer_idx_from_weight_name(self.config, name) |
| 284 | if spec_layer is None: |
| 285 | # A tied top-level embed_tokens has no spec layer to rewrite |
| 286 | # from; the draft needs its own copy under PP. |
| 287 | param = params_dict.get(name) if "embed_tokens" in name else None |
| 288 | if param is not None: |
| 289 | weight_loader = getattr( |
| 290 | param, "weight_loader", default_weight_loader |
| 291 | ) |
| 292 | weight_loader(param, loaded_weight) |
| 293 | loaded_params.add(name) |
| 294 | continue |
| 295 | is_fusion_moe_shared_experts_layer = ( |
| 296 | self.is_fused_shared_expert_enabled and ("mlp.shared_experts" in name) |
| 297 | ) |
| 298 | name = self._rewrite_spec_layer_name(spec_layer, name) |
| 299 | |
| 300 | if _try_load_fp8_indexer_wk( |
| 301 | name, |
| 302 | loaded_weight, |
| 303 | _pending_wk_fp8, |
| 304 | params_dict, |
| 305 | loaded_params, |
| 306 | pp_missing_layer_names, |
| 307 | ): |
| 308 | continue |
| 309 | |
| 310 | for param_name, weight_name, shard_id in stacked_params_mapping: |
| 311 | if weight_name not in name: |
| 312 | continue |
| 313 | if ("mlp.experts." in name) and name not in params_dict: |
| 314 | continue |
| 315 | if is_fusion_moe_shared_experts_layer: |
| 316 | continue |
| 317 | name_mapped = name.replace(weight_name, param_name) |
| 318 | if ( |
| 319 | param_name == "fused_qkv_a_proj" |
| 320 | ) and name_mapped not in params_dict: |
| 321 | continue |
| 322 | else: |
| 323 | name = name_mapped |
| 324 | if name.endswith(".bias") and name not in params_dict: |
| 325 | continue |
| 326 | param = params_dict[name] |
| 327 | weight_loader = param.weight_loader |
| 328 | weight_loader(param, loaded_weight, shard_id) |
| 329 | break |
| 330 | else: |
| 331 | num_chunks = 1 |
| 332 | if is_fusion_moe_shared_experts_layer: |
| 333 | num_chunks = getattr(self.config, "n_shared_experts", 1) or 1 |
| 334 | split_dim = ( |
| 335 | 1 |
| 336 | if ("down_proj.weight" in name and loaded_weight.ndim > 1) |
| 337 | else 0 |
| 338 | ) |
| 339 | total = loaded_weight.shape[split_dim] |
| 340 | assert total % num_chunks == 0 |
| 341 | chunk_size = total // num_chunks |
| 342 | |
| 343 | for j in range(num_chunks): |
| 344 | chunk_name = name |
| 345 | weight_to_load = loaded_weight |
| 346 | if is_fusion_moe_shared_experts_layer: |
| 347 | chunk_slice = slice(j * chunk_size, (j + 1) * chunk_size) |
| 348 | if loaded_weight.ndim == 1: |
| 349 | weight_to_load = loaded_weight[chunk_slice] |
| 350 | elif split_dim == 0: |
| 351 | weight_to_load = loaded_weight[chunk_slice, :] |
| 352 | else: |
| 353 | weight_to_load = loaded_weight[:, chunk_slice] |
| 354 | chunk_name = name.replace( |
| 355 | "mlp.shared_experts", |
| 356 | f"mlp.experts.{self.config.n_routed_experts + j}", |
| 357 | ) |
| 358 | |
| 359 | is_expert_weight = False |
| 360 | for mapping in expert_params_mapping: |
| 361 | param_name, weight_name, expert_id, shard_id = mapping # type: ignore[assignment] |
| 362 | if weight_name not in chunk_name: |
| 363 | continue |
| 364 | is_expert_weight = True |
| 365 | name_mapped = chunk_name.replace(weight_name, param_name) |
| 366 | param = params_dict[name_mapped] |
| 367 | weight_loader = typing.cast( |
| 368 | Callable[..., bool], param.weight_loader |
| 369 | ) |
| 370 | success = weight_loader( |
| 371 | param, |
| 372 | weight_to_load, |
| 373 | name_mapped, |
| 374 | shard_id=shard_id, |
| 375 | expert_id=expert_id, |
| 376 | return_success=True, |
| 377 | ) |
| 378 | if success: |
| 379 | if not is_fusion_moe_shared_experts_layer: |
| 380 | name = name_mapped |
| 381 | else: |
| 382 | loaded_params.add(name_mapped) |
| 383 | break |
| 384 | else: |
| 385 | if is_expert_weight: |
| 386 | continue |
| 387 | if name.endswith(".bias") and name not in params_dict: |
| 388 | continue |
| 389 | name = maybe_remap_kv_scale_name(name, params_dict) # type: ignore[assignment] |
| 390 | if name is None: |
| 391 | continue |
| 392 | if ( |
| 393 | spec_layer != self.model.mtp_start_layer_idx |
| 394 | and ".layers" not in name |
| 395 | ): |
| 396 | continue |
| 397 | param = params_dict[name] |
| 398 | weight_loader = getattr( |
| 399 | param, "weight_loader", default_weight_loader |
| 400 | ) |
| 401 | weight_loader(param, loaded_weight) |
| 402 | if not is_fusion_moe_shared_experts_layer: |
| 403 | loaded_params.add(name) |
| 404 | |
| 405 | loaded_layers: set[int] = set() |
| 406 | for param_name in loaded_params: |
| 407 | spec_layer = get_spec_layer_idx_from_weight_name(self.config, param_name) |
| 408 | if spec_layer is not None: |
| 409 | loaded_layers.add(spec_layer) |
| 410 | for layer_idx in range( |
| 411 | self.model.mtp_start_layer_idx, |
| 412 | self.model.mtp_start_layer_idx + self.model.num_mtp_layers, |
| 413 | ): |
| 414 | if layer_idx not in loaded_layers: |
| 415 | raise ValueError( |
| 416 | f"MTP speculative decoding layer {layer_idx} weights " |
| 417 | f"missing from checkpoint." |
| 418 | ) |
| 419 | return loaded_params |