[Model] Support Qwen2.5-Math-RM-72B (vllm-project#8896)

Signed-off-by: Amit Garg <mitgarg17495@gmail.com>

Author: zhuzilin

vllm/model_executor/layers/pooler.py

@@ -11,6 +11,7 @@
 class PoolingType(IntEnum):
     """Enumeration for different types of pooling methods."""
     LAST = 0
+    ALL = 1
 
 
 class Pooler(nn.Module):
@@ -43,6 +44,12 @@ def forward(
         if self.pooling_type == PoolingType.LAST:
             last_token_flat_indices = torch.cumsum(prompt_lens, dim=0) - 1
             pooled_data = hidden_states[last_token_flat_indices]
+        elif self.pooling_type == PoolingType.ALL:
+            offset = 0
+            pooled_data = []
+            for prompt_len in prompt_lens:
+                pooled_data.append(hidden_states[offset:offset + prompt_len])
+                offset += prompt_len
         else:
             raise ValueError(f"Invalid pooling type: {self.pooling_type}")
 

vllm/model_executor/models/__init__.py

@@ -74,6 +74,7 @@
 
 _EMBEDDING_MODELS = {
     "MistralModel": ("llama_embedding", "LlamaEmbeddingModel"),
+    "Qwen2ForRewardModel": ("qwen2_rm", "Qwen2ForRewardModel"),
 }
 
 _MULTIMODAL_MODELS = {

vllm/model_executor/models/qwen2_rm.py

@@ -0,0 +1,162 @@
+# coding=utf-8
+# Adapted from
+# https://huggingface.co/Qwen/Qwen2.5-Math-RM-72B/blob/main/modeling_qwen2_rm.py
+# Copyright 2024 The Qwen team.
+# Copyright 2023 The vLLM team.
+"""Inference-only Qwen2-RM model compatible with HuggingFace weights."""
+from typing import Iterable, List, Optional, Tuple
+
+import torch
+from torch import nn
+from transformers import Qwen2Config
+
+from vllm.attention import AttentionMetadata
+from vllm.config import CacheConfig, LoRAConfig
+from vllm.model_executor.layers.linear import (ColumnParallelLinear,
+                                               RowParallelLinear)
+from vllm.model_executor.layers.pooler import Pooler, PoolingType
+from vllm.model_executor.layers.quantization.base_config import (
+    QuantizationConfig)
+from vllm.model_executor.model_loader.weight_utils import (
+    default_weight_loader, maybe_remap_kv_scale_name)
+from vllm.model_executor.models.qwen2 import Qwen2Model
+from vllm.model_executor.pooling_metadata import PoolingMetadata
+from vllm.sequence import IntermediateTensors, PoolerOutput
+
+from .utils import is_pp_missing_parameter
+
+
+class ReLU(nn.Module):
+
+    def __init__(self):
+        super().__init__()
+        self.activation = nn.ReLU()
+
+    def forward(self, input):
+        input, _ = input
+        return self.activation(input)
+
+
+class Qwen2ForRewardModel(nn.Module):
+    packed_modules_mapping = {
+        "qkv_proj": [
+            "q_proj",
+            "k_proj",
+            "v_proj",
+        ],
+        "gate_up_proj": [
+            "gate_proj",
+            "up_proj",
+        ],
+    }
+
+    # LoRA specific attributes
+    supported_lora_modules = [
+        "qkv_proj",
+        "o_proj",
+        "gate_up_proj",
+        "down_proj",
+    ]
+    embedding_modules = {}
+    embedding_padding_modules = []
+
+    def __init__(
+        self,
+        config: Qwen2Config,
+        cache_config: Optional[CacheConfig] = None,
+        quant_config: Optional[QuantizationConfig] = None,
+        lora_config: Optional[LoRAConfig] = None,
+    ) -> None:
+        # TODO (@robertgshaw2): see if this can be moved out
+        if (cache_config.sliding_window is not None
+                and hasattr(config, "max_window_layers")):
+            raise ValueError("Sliding window for some but all layers is not "
+                             "supported. This model uses sliding window "
+                             "but `max_window_layers` = %s is less than "
+                             "`num_hidden_layers` = %s. Please open an issue "
+                             "to discuss this feature." % (
+                                 config.max_window_layers,
+                                 config.num_hidden_layers,
+                             ))
+
+        super().__init__()
+
+        self.config = config
+        self.lora_config = lora_config
+
+        self.quant_config = quant_config
+        self.model = Qwen2Model(config, cache_config, quant_config)
+
+        self.score = nn.Sequential(
+            ColumnParallelLinear(config.hidden_size,
+                                 config.hidden_size,
+                                 quant_config=quant_config),
+            ReLU(),
+            RowParallelLinear(config.hidden_size, 1,
+                              quant_config=quant_config),
+        )
+        self._pooler = Pooler(pooling_type=PoolingType.ALL, normalize=False)
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        kv_caches: List[torch.Tensor],
+        attn_metadata: AttentionMetadata,
+        intermediate_tensors: Optional[IntermediateTensors] = None,
+    ) -> torch.Tensor:
+        hidden_states = self.model(input_ids, positions, kv_caches,
+                                   attn_metadata, intermediate_tensors)
+        logits, _ = self.score(hidden_states)
+        return logits
+
+    def pooler(
+        self,
+        hidden_states: torch.Tensor,
+        pooling_metadata: PoolingMetadata,
+    ) -> Optional[PoolerOutput]:
+        return self._pooler(hidden_states, pooling_metadata)
+
+    def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
+        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_dict = dict(self.named_parameters(remove_duplicate=False))
+        for name, loaded_weight in weights:
+            # Skip loading lm_head for embedding model
+            if name == "lm_head.weight":
+                continue
+            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
+                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
+                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
+                # 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)