[Model] Support InternLM2 Reward models (#11571)

Signed-off-by: Isotr0py <2037008807@qq.com>
Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

Author: Isotr0py

docs/source/models/supported_models.md

@@ -450,6 +450,11 @@ of the whole prompt are extracted from the normalized hidden state corresponding
     - Example HF Models
     - :ref:`LoRA <lora-adapter>`
     - :ref:`PP <distributed-serving>`
+  * - :code:`InternLM2ForRewardModel`
+    - InternLM2-based
+    - :code:`internlm/internlm2-1_8b-reward`, :code:`internlm/internlm2-7b-reward`, etc.
+    - ✅︎
+    - ✅︎
   * - :code:`LlamaForCausalLM`
     - Llama-based
     - :code:`peiyi9979/math-shepherd-mistral-7b-prm`, etc.

tests/models/registry.py

@@ -140,6 +140,8 @@ class _HfExamplesInfo:
     "BertModel": _HfExamplesInfo("BAAI/bge-base-en-v1.5"),
     "Gemma2Model": _HfExamplesInfo("BAAI/bge-multilingual-gemma2"),
     "GritLM": _HfExamplesInfo("parasail-ai/GritLM-7B-vllm"),
+    "InternLM2ForRewardModel": _HfExamplesInfo("internlm/internlm2-1_8b-reward",
+                                               trust_remote_code=True),
     "JambaForSequenceClassification": _HfExamplesInfo("ai21labs/Jamba-tiny-reward-dev"),  # noqa: E501
     "LlamaModel": _HfExamplesInfo("llama", is_available_online=False),
     "MistralModel": _HfExamplesInfo("intfloat/e5-mistral-7b-instruct"),

vllm/model_executor/models/internlm2.py

@@ -18,14 +18,16 @@
                                                QKVParallelLinear,
                                                RowParallelLinear)
 from vllm.model_executor.layers.logits_processor import LogitsProcessor
+from vllm.model_executor.layers.pooler import Pooler, PoolingType
 from vllm.model_executor.layers.quantization import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.model_executor.layers.sampler import SamplerOutput, get_sampler
 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.pooling_metadata import PoolingMetadata
 from vllm.model_executor.sampling_metadata import SamplingMetadata
-from vllm.sequence import IntermediateTensors
+from vllm.sequence import IntermediateTensors, PoolerOutput
 
 from .interfaces import SupportsLoRA, SupportsPP
 from .utils import (is_pp_missing_parameter,
@@ -433,3 +435,59 @@ def load_weights(self, weights: Iterable[Tuple[str,
                 weight_loader(param, loaded_weight)
             loaded_params.add(name)
         return loaded_params
+
+
+class InternLM2ForRewardModel(InternLM2ForCausalLM):
+
+    def __init__(
+        self,
+        *,
+        vllm_config: VllmConfig,
+        prefix: str = "",
+        model_type: Type[InternLM2Model] = InternLM2Model,
+    ):
+        super().__init__(vllm_config=vllm_config,
+                         prefix=prefix,
+                         model_type=model_type)
+
+        for attr in ("output", "logits_processor", "sampler"):
+            delattr(self, attr)
+
+        config = vllm_config.model_config.hf_config
+        self.v_head = RowParallelLinear(
+            config.hidden_size,
+            1,
+            bias=False,
+            input_is_parallel=False,
+            prefix=maybe_prefix(prefix, "v_head"),
+        )
+
+        pooler_config = vllm_config.model_config.pooler_config
+        self._pooler = Pooler.from_config_with_defaults(
+            pooler_config,
+            pooling_type=PoolingType.ALL,
+            normalize=False,
+            softmax=False,
+        )
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        kv_caches: List[torch.Tensor],
+        attn_metadata: AttentionMetadata,
+        intermediate_tensors: Optional[IntermediateTensors] = None,
+        inputs_embeds: Optional[torch.Tensor] = None,
+    ) -> Union[torch.Tensor, IntermediateTensors]:
+        hidden_states = self.model(input_ids, positions, kv_caches,
+                                   attn_metadata, intermediate_tensors,
+                                   inputs_embeds)
+        logits, _ = self.v_head(hidden_states)
+        return logits
+
+    def pooler(
+        self,
+        hidden_states: torch.Tensor,
+        pooling_metadata: PoolingMetadata,
+    ) -> Optional[PoolerOutput]:
+        return self._pooler(hidden_states, pooling_metadata)

vllm/model_executor/models/registry.py

@@ -113,6 +113,7 @@
     "Gemma2Model": ("gemma2", "Gemma2ForCausalLM"),
     "GlmForCausalLM": ("glm", "GlmForCausalLM"),
     "GritLM": ("gritlm", "GritLM"),
+    "InternLM2ForRewardModel": ("internlm2", "InternLM2ForRewardModel"),
     "JambaForSequenceClassification": ("jamba", "JambaForSequenceClassification"),  # noqa: E501
     "LlamaModel": ("llama", "LlamaForCausalLM"),
     **{