[Model] PP support for Mamba-like models (#10992)

Signed-off-by: mzusman <mor.zusmann@gmail.com>

docs/source/models/supported_models.rst

@@ -128,7 +128,7 @@ Text Generation
     - FalconMamba
     - :code:`tiiuae/falcon-mamba-7b`, :code:`tiiuae/falcon-mamba-7b-instruct`, etc.
     - ✅︎
-    -  
+    - ✅︎
   * - :code:`GemmaForCausalLM`
     - Gemma
     - :code:`google/gemma-2b`, :code:`google/gemma-7b`, etc.
@@ -193,7 +193,7 @@ Text Generation
     - Jamba
     - :code:`ai21labs/AI21-Jamba-1.5-Large`, :code:`ai21labs/AI21-Jamba-1.5-Mini`, :code:`ai21labs/Jamba-v0.1`, etc.
     - ✅︎
-    - 
+    - ✅︎
   * - :code:`LlamaForCausalLM`
     - Llama 3.1, Llama 3, Llama 2, LLaMA, Yi
     - :code:`meta-llama/Meta-Llama-3.1-405B-Instruct`, :code:`meta-llama/Meta-Llama-3.1-70B`, :code:`meta-llama/Meta-Llama-3-70B-Instruct`, :code:`meta-llama/Llama-2-70b-hf`, :code:`01-ai/Yi-34B`, etc.
@@ -203,7 +203,7 @@ Text Generation
     - Mamba
     - :code:`state-spaces/mamba-130m-hf`, :code:`state-spaces/mamba-790m-hf`, :code:`state-spaces/mamba-2.8b-hf`, etc.
     -
-    -
+    - ✅︎
   * - :code:`MiniCPMForCausalLM`
     - MiniCPM
     - :code:`openbmb/MiniCPM-2B-sft-bf16`, :code:`openbmb/MiniCPM-2B-dpo-bf16`, :code:`openbmb/MiniCPM-S-1B-sft`, etc.

tests/distributed/test_pipeline_parallel.py

@@ -156,13 +156,13 @@ TEXT_GENERATION_MODELS = {
     # "internlm/internlm-chat-7b": PPTestSettings.fast(),
     "internlm/internlm2-chat-7b": PPTestSettings.fast(trust_remote_code=True),
     "inceptionai/jais-13b-chat": PPTestSettings.fast(),
-    # TODO: Implement PP
+    "ai21labs/Jamba-tiny-dev": PPTestSettings.fast(),
-    # "ai21labs/AI21-Jamba-1.5-Mini": PPTestSettings.fast(),
     "meta-llama/Meta-Llama-3-8B": PPTestSettings.detailed(),
     "openbmb/MiniCPM-2B-sft-bf16": PPTestSettings.fast(trust_remote_code=True),
     "openbmb/MiniCPM3-4B": PPTestSettings.fast(trust_remote_code=True),
     # Uses Llama
     # "mistralai/Mistral-7B-Instruct-v0.1": PPTestSettings.fast(),
+    "state-spaces/mamba-130m-hf": PPTestSettings.fast(),
     "mistralai/Mixtral-8x7B-Instruct-v0.1": PPTestSettings.fast(tp_base=4),
     "mosaicml/mpt-7b": PPTestSettings.fast(),
     "nvidia/Minitron-8B-Base": PPTestSettings.fast(),
@@ -234,6 +234,8 @@ TEST_MODELS = [
     "OpenGVLab/InternVL2-1B",
     "microsoft/Phi-3-vision-128k-instruct",
     "fixie-ai/ultravox-v0_3",
+    # [LANGUAGE GENERATION - HYBRID ARCH]
+    "ai21labs/Jamba-tiny-dev",
 ]
 
 

vllm/config.py

@@ -27,8 +27,8 @@ from vllm.transformers_utils.config import (
     ConfigFormat, get_config, get_hf_image_processor_config,
     get_hf_text_config, get_pooling_config,
     get_sentence_transformer_tokenizer_config, is_encoder_decoder, uses_mrope)
-from vllm.utils import (GiB_bytes, cuda_device_count_stateless, get_cpu_memory,
+from vllm.utils import (GiB_bytes, LayerBlockType, cuda_device_count_stateless,
-                        print_warning_once, random_uuid,
+                        get_cpu_memory, print_warning_once, random_uuid,
                         resolve_obj_by_qualname)
 
 if TYPE_CHECKING:
@@ -284,6 +284,7 @@ class ModelConfig:
             self._verify_tokenizer_mode()
 
         self.is_attention_free = self._init_attention_free()
+        self.is_hybrid = self._init_is_hybrid()
         self.has_inner_state = self._init_has_inner_state()
 
         if current_platform.is_neuron():
@@ -340,6 +341,10 @@ class ModelConfig:
         architectures = getattr(self.hf_config, "architectures", [])
         return ModelRegistry.is_attention_free_model(architectures)
 
+    def _init_is_hybrid(self) -> bool:
+        architectures = getattr(self.hf_config, "architectures", [])
+        return ModelRegistry.is_hybrid_model(architectures)
+
     def _init_has_inner_state(self) -> bool:
         architectures = getattr(self.hf_config, "architectures", [])
         return ModelRegistry.model_has_inner_state(architectures)
@@ -669,26 +674,51 @@ class ModelConfig:
         num_heads = getattr(self.hf_text_config, "num_attention_heads", 0)
         return num_heads // parallel_config.tensor_parallel_size
 
-    def get_num_layers(self, parallel_config: "ParallelConfig") -> int:
+    def get_layers_start_end_indices(
+            self, parallel_config: "ParallelConfig") -> Tuple[int, int]:
         from vllm.distributed.utils import get_pp_indices
         total_num_hidden_layers = getattr(self.hf_text_config,
                                           "num_hidden_layers", 0)
         pp_rank = parallel_config.rank // parallel_config.tensor_parallel_size
         pp_size = parallel_config.pipeline_parallel_size
         start, end = get_pp_indices(total_num_hidden_layers, pp_rank, pp_size)
+        return start, end
+
+    def get_num_layers(self, parallel_config: "ParallelConfig") -> int:
+        start, end = self.get_layers_start_end_indices(parallel_config)
         return end - start
 
-    def get_num_attention_layers(self,
+    def get_num_layers_by_block_type(
-                                 parallel_config: "ParallelConfig") -> int:
+        self,
-        if self.is_attention_free:
+        parallel_config: "ParallelConfig",
-            return 0
+        block_type: LayerBlockType = LayerBlockType.attention,
+    ) -> int:
+        # This function relies on 'layers_block_type' in hf_config,
+        # for w/o this attribute, we will need to have workarounds like so
+        attn_block_type = block_type == LayerBlockType.attention
+        is_transformer = not self.is_hybrid and not self.is_attention_free
+        start, end = self.get_layers_start_end_indices(parallel_config)
 
-        num_layers = self.get_num_layers(parallel_config)
+        if is_transformer:
+            # Handle the basic case first
+            return end - start if attn_block_type else 0
+        elif self.is_attention_free:
+            # Attention free
+            # Note that this code assumes there
+            # is only one type of attention-free block type.
+            return 0 if attn_block_type else end - start
+        else:
+            # Hybrid model
+            layers_block_type_value = getattr(self.hf_config,
+                                              "layers_block_type", None)
+            if layers_block_type_value is None:
+                raise ValueError("The model is an hybrid without a"
+                                 "layers_block_type in the hf_config,"
+                                 "cannot determine the num of "
+                                 f"{block_type.value} layers")
 
-        # Transformers supports layers_block_type @property
+            return sum(t == block_type.value
-        layers = getattr(self.hf_config, "layers_block_type",
+                       for t in layers_block_type_value[start:end])
-                         ["attention"] * num_layers)
-        return len([t for t in layers if t == "attention"])
 
     def get_multimodal_config(self) -> "MultiModalConfig":
         """

vllm/model_executor/models/interfaces.py

@@ -363,6 +363,43 @@ def is_attention_free(
     return isinstance(model, IsAttentionFree)
 
 
+@runtime_checkable
+class IsHybrid(Protocol):
+    """The interface required for all models like Jamba that have both
+    attention and mamba blocks, indicates that 
+    hf_config has 'layers_block_type'"""
+
+    is_hybrid: ClassVar[Literal[True]] = True
+    """
+        A flag that indicates this model has both mamba and attention blocks
+        , also indicates that the model's hf_config has 
+        'layers_block_type' """
+
+
+@runtime_checkable
+class _IsHybridType(Protocol):
+    is_hybrid: ClassVar[Literal[True]]
+
+
+@overload
+def is_hybrid(model: object) -> TypeIs[IsHybrid]:
+    ...
+
+
+@overload
+def is_hybrid(model: Type[object]) -> TypeIs[Type[IsHybrid]]:
+    ...
+
+
+def is_hybrid(
+    model: Union[Type[object], object]
+) -> Union[TypeIs[Type[IsHybrid]], TypeIs[IsHybrid]]:
+    if isinstance(model, type):
+        return isinstance(model, _IsHybridType)
+
+    return isinstance(model, IsHybrid)
+
+
 @runtime_checkable
 class SupportsCrossEncoding(Protocol):
     """The interface required for all models that support cross encoding."""

vllm/model_executor/models/jamba.py

@@ -9,6 +9,7 @@ from vllm.attention.backends.abstract import AttentionMetadata
 from vllm.attention.layer import Attention
 from vllm.config import _BATCH_SIZES_TO_CAPTURE, CacheConfig, VllmConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
+from vllm.distributed.parallel_state import get_pp_group
 from vllm.model_executor.layers.fused_moe import FusedMoE
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.model_executor.layers.linear import (QKVParallelLinear,
@@ -25,9 +26,12 @@ from vllm.model_executor.models.mamba_cache import (MambaCacheManager,
                                                     MambaCacheParams)
 from vllm.model_executor.sampling_metadata import SamplingMetadata
 from vllm.sequence import IntermediateTensors
+from vllm.utils import LayerBlockType
 
-from .interfaces import HasInnerState, SupportsLoRA
+from .interfaces import HasInnerState, IsHybrid, SupportsLoRA, SupportsPP
-from .utils import maybe_prefix
+from .utils import (is_pp_missing_parameter,
+                    make_empty_intermediate_tensors_factory, make_layers,
+                    maybe_prefix)
 
 KVCache = Tuple[torch.Tensor, torch.Tensor]
 
@@ -281,16 +285,24 @@ class JambaModel(nn.Module):
             org_num_embeddings=config.vocab_size,
         )
 
-        decoder_layers = []
+        def get_layer(prefix: str):
-        for i in range(config.num_hidden_layers):
+            layer_idx = int(prefix.rsplit(".", 1)[1])
-            layer_class = ALL_DECODER_LAYER_TYPES[config.layers_block_type[i]]
+            layer_class = ALL_DECODER_LAYER_TYPES[
-            decoder_layers.append(
+                config.layers_block_type[layer_idx]]
-                layer_class(config,
+            return layer_class(
-                            layer_idx=i,
+                config,
-                            cache_config=cache_config,
+                layer_idx,
-                            quant_config=quant_config,
+                cache_config,
-                            prefix=f"{prefix}.layers.{i}"))
+                quant_config=quant_config,
-        self.layers = nn.ModuleList(decoder_layers)
+                prefix=prefix,
+            )
+
+        self.start_layer, self.end_layer, self.layers = make_layers(
+            config.num_hidden_layers, get_layer, prefix=f"{prefix}.layers")
+        self.make_empty_intermediate_tensors = (
+            make_empty_intermediate_tensors_factory(
+                ["hidden_states", "residual"], config.hidden_size))
+
         self.final_layernorm = RMSNorm(config.hidden_size,
                                        eps=config.rms_norm_eps)
 
@@ -304,26 +316,34 @@ class JambaModel(nn.Module):
         kv_caches: List[torch.Tensor],
         attn_metadata: AttentionMetadata,
         mamba_cache_params: MambaCacheParams,
+        intermediate_tensors: Optional[IntermediateTensors] = None,
         inputs_embeds: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
-        if inputs_embeds is not None:
+        if get_pp_group().is_first_rank:
-            hidden_states = inputs_embeds
+            if inputs_embeds is not None:
+                hidden_states = inputs_embeds
+            else:
+                hidden_states = self.get_input_embeddings(input_ids)
+            residual = None
         else:
-            hidden_states = self.get_input_embeddings(input_ids)
+            assert intermediate_tensors is not None
-        residual = None
+            hidden_states = intermediate_tensors["hidden_states"]
-        for i in range(len(self.layers)):
+            residual = intermediate_tensors["residual"]
+
+        kv_cache_index = 0
+        mamba_cache_index = 0
+        for i in range(self.start_layer, self.end_layer):
             layer = self.layers[i]
             kv_cache = None
             layer_mamba_cache_params = None
             if isinstance(layer, JambaAttentionDecoderLayer):
-                kv_cache = kv_caches[(i - self.config.attn_layer_offset) //
+                kv_cache = kv_caches[kv_cache_index]
-                                     self.config.attn_layer_period]
+                kv_cache_index += 1
             if isinstance(layer, JambaMambaDecoderLayer):
-                current_state_layer = i - (1 +
+                current_state_layer = mamba_cache_index
-                                           (i - self.config.attn_layer_offset)
-                                           // self.config.attn_layer_period)
                 layer_mamba_cache_params = mamba_cache_params.at_layer_idx(
                     current_state_layer)
+                mamba_cache_index += 1
 
             hidden_states, residual = layer(
                 positions=positions,
@@ -332,11 +352,17 @@ class JambaModel(nn.Module):
                 attn_metadata=attn_metadata,
                 residual=residual,
                 mamba_cache_params=layer_mamba_cache_params)
+        if not get_pp_group().is_last_rank:
+            return IntermediateTensors({
+                "hidden_states": hidden_states,
+                "residual": residual
+            })
         hidden_states, _ = self.final_layernorm(hidden_states, residual)
         return hidden_states
 
 
-class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
+class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA, SupportsPP,
+                       IsHybrid):
     packed_modules_mapping = {
         "qkv_proj": [
             "q_proj",
@@ -368,6 +394,8 @@ class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
 
         super().__init__()
         self.config = config
+        self.vllm_config = vllm_config
+        self.model_config = vllm_config.model_config
         self.scheduler_config = scheduler_config
         self.model = JambaModel(vllm_config=vllm_config,
                                 prefix=maybe_prefix(prefix, "model"))
@@ -390,6 +418,9 @@ class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
                                                 config.vocab_size)
         self.sampler = get_sampler()
 
+        self.make_empty_intermediate_tensors = (
+            self.model.make_empty_intermediate_tensors)
+
     def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.model.get_input_embeddings(input_ids)
 
@@ -406,10 +437,8 @@ class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
                 self.scheduler_config.max_num_seqs) if self.scheduler_config
                               else max(_BATCH_SIZES_TO_CAPTURE) + 2)
 
-            layers_type = self.config.layers_block_type
+            num_mamba_layers = self.model_config.get_num_layers_by_block_type(
-            num_mamba_layers = sum(
+                self.vllm_config.parallel_config, LayerBlockType.mamba)
-                [layer_type == "mamba" for layer_type in layers_type])
-
             self.mamba_cache = MambaCacheManager(
                 self.lm_head.weight.dtype, num_mamba_layers, max_batch_size,
                 *self._get_mamba_cache_shape())
@@ -423,7 +452,7 @@ class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
                                               state_indices_tensor)
         hidden_states = self.model(input_ids, positions, kv_caches,
                                    attn_metadata, mamba_cache_params,
-                                   inputs_embeds)
+                                   intermediate_tensors, inputs_embeds)
         return hidden_states
 
     def copy_inputs_before_cuda_graphs(self, input_buffers, **kwargs):
@@ -504,8 +533,12 @@ class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
                     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
                 param = params_dict[name]
                 weight_loader = param.weight_loader
                 weight_loader(param, loaded_weight, shard_id)
@@ -520,6 +553,8 @@ class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
                     if weight_name not in name:
                         continue
 
+                    if is_pp_missing_parameter(name, self):
+                        continue
                     name = name.replace(weight_name, param_name)
                     param = params_dict[name]
                     weight_loader = param.weight_loader
@@ -533,6 +568,8 @@ class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA):
                     # 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",

vllm/model_executor/models/mamba.py

@@ -8,6 +8,7 @@ from transformers import MambaConfig
 from vllm.attention.backends.abstract import AttentionMetadata
 from vllm.config import _BATCH_SIZES_TO_CAPTURE, CacheConfig, VllmConfig
 from vllm.distributed import get_tensor_model_parallel_world_size
+from vllm.distributed.parallel_state import get_pp_group
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.model_executor.layers.logits_processor import LogitsProcessor
 from vllm.model_executor.layers.mamba.mamba_mixer import MambaMixer
@@ -18,13 +19,16 @@ 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
 from vllm.model_executor.models.interfaces import (HasInnerState,
-                                                   IsAttentionFree)
+                                                   IsAttentionFree, SupportsPP)
 from vllm.model_executor.models.mamba_cache import (MambaCacheManager,
                                                     MambaCacheParams)
 from vllm.model_executor.sampling_metadata import SamplingMetadata
 from vllm.sequence import IntermediateTensors
+from vllm.utils import LayerBlockType
 
-from .utils import maybe_prefix
+from .utils import (is_pp_missing_parameter,
+                    make_empty_intermediate_tensors_factory, make_layers,
+                    maybe_prefix)
 
 KVCache = Tuple[torch.Tensor, torch.Tensor]
 
@@ -95,15 +99,17 @@ class MambaModel(nn.Module):
             org_num_embeddings=config.vocab_size,
         )
 
-        decoder_layers = []
+        self.start_layer, self.end_layer, self.layers = make_layers(
-        for i in range(config.num_hidden_layers):
+            config.num_hidden_layers,
-            decoder_layers.append(
+            lambda prefix: MambaDecoderLayer(
-                MambaDecoderLayer(config,
+                config, cache_config=cache_config, quant_config=quant_config),
-                                  cache_config=cache_config,
+            prefix=f"{prefix}.layers")
-                                  quant_config=quant_config))
+
-        self.layers = nn.ModuleList(decoder_layers)
         self.norm_f = RMSNorm(config.hidden_size,
                               eps=config.layer_norm_epsilon)
+        self.make_empty_intermediate_tensors = (
+            make_empty_intermediate_tensors_factory(
+                ["hidden_states", "residual"], config.hidden_size))
 
     def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.embeddings(input_ids)
@@ -114,29 +120,40 @@ class MambaModel(nn.Module):
         positions: torch.Tensor,
         attn_metadata: AttentionMetadata,
         mamba_cache_params: MambaCacheParams,
+        intermediate_tensors: Optional[IntermediateTensors] = None,
         inputs_embeds: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
-
+        if get_pp_group().is_first_rank:
-        if inputs_embeds is not None:
+            if inputs_embeds is not None:
-            hidden_states = inputs_embeds
+                hidden_states = inputs_embeds
+            else:
+                hidden_states = self.get_input_embeddings(input_ids)
+            residual = None
         else:
-            hidden_states = self.get_input_embeddings(input_ids)
+            assert intermediate_tensors is not None
-        residual = None
+            hidden_states = intermediate_tensors["hidden_states"]
+            residual = intermediate_tensors["residual"]
 
-        for i in range(len(self.layers)):
+        for i in range(self.start_layer, self.end_layer):
             layer = self.layers[i]
             hidden_states, residual = layer(
                 positions=positions,
                 hidden_states=hidden_states,
                 attn_metadata=attn_metadata,
                 residual=residual,
-                mamba_cache_params=mamba_cache_params.at_layer_idx(i))
+                mamba_cache_params=mamba_cache_params.at_layer_idx(
+                    i - self.start_layer))
+        if not get_pp_group().is_last_rank:
+            return IntermediateTensors({
+                "hidden_states": hidden_states,
+                "residual": residual
+            })
         hidden_states, _ = self.norm_f(hidden_states, residual)
 
         return hidden_states
 
 
-class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree):
+class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree, SupportsPP):
 
     def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
         config = vllm_config.model_config.hf_config
@@ -148,7 +165,9 @@ class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree):
 
         super().__init__()
         self.config = config
+        self.vllm_config = vllm_config
         self.scheduler_config = scheduler_config
+        self.model_config = vllm_config.model_config
         self.backbone = MambaModel(vllm_config=vllm_config,
                                    prefix=maybe_prefix(prefix, "backbone"))
         self.unpadded_vocab_size = config.vocab_size
@@ -174,6 +193,9 @@ class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree):
                                                 config.vocab_size)
         self.sampler = get_sampler()
 
+        self.make_empty_intermediate_tensors = (
+            self.backbone.make_empty_intermediate_tensors)
+
     def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.backbone.get_input_embeddings(input_ids)
 
@@ -189,9 +211,12 @@ class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree):
             max_batch_size = (VllmConfig.get_graph_batch_size(
                 self.scheduler_config.max_num_seqs) if self.scheduler_config
                               else max(_BATCH_SIZES_TO_CAPTURE) + 2)
+
+            num_mamba_layers = self.model_config.get_num_layers_by_block_type(
+                self.vllm_config.parallel_config, LayerBlockType.mamba)
             self.mamba_cache = MambaCacheManager(
-                self.lm_head.weight.dtype, self.config.num_hidden_layers,
+                self.lm_head.weight.dtype, num_mamba_layers, max_batch_size,
-                max_batch_size, *self._get_mamba_cache_shape())
+                *self._get_mamba_cache_shape())
 
         (
             mamba_cache_tensors,
@@ -204,7 +229,8 @@ class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree):
                                               state_indices_tensor)
 
         hidden_states = self.backbone(input_ids, positions, attn_metadata,
-                                      mamba_cache_params, inputs_embeds)
+                                      mamba_cache_params, intermediate_tensors,
+                                      inputs_embeds)
 
         return hidden_states
 
@@ -252,6 +278,8 @@ class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree):
             # 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",

vllm/model_executor/models/registry.py

@@ -21,7 +21,7 @@ from vllm.logger import init_logger
 from vllm.platforms import current_platform
 
 from .adapters import as_embedding_model
-from .interfaces import (has_inner_state, is_attention_free,
+from .interfaces import (has_inner_state, is_attention_free, is_hybrid,
                          supports_cross_encoding, supports_multimodal,
                          supports_pp)
 from .interfaces_base import is_pooling_model, is_text_generation_model
@@ -218,6 +218,7 @@ class _ModelInfo:
     supports_pp: bool
     has_inner_state: bool
     is_attention_free: bool
+    is_hybrid: bool
 
     @staticmethod
     def from_model_cls(model: Type[nn.Module]) -> "_ModelInfo":
@@ -239,6 +240,7 @@ class _ModelInfo:
             supports_pp=supports_pp(model),
             has_inner_state=has_inner_state(model),
             is_attention_free=is_attention_free(model),
+            is_hybrid=is_hybrid(model),
         )
 
 
@@ -484,6 +486,13 @@ class _ModelRegistry:
         model_cls, _ = self.inspect_model_cls(architectures)
         return model_cls.is_attention_free
 
+    def is_hybrid_model(
+        self,
+        architectures: Union[str, List[str]],
+    ) -> bool:
+        model_cls, _ = self.inspect_model_cls(architectures)
+        return model_cls.is_hybrid
+
 
 ModelRegistry = _ModelRegistry({
     model_arch: _LazyRegisteredModel(

vllm/utils.py

@@ -170,6 +170,11 @@ class Device(enum.Enum):
     CPU = enum.auto()
 
 
+class LayerBlockType(enum.Enum):
+    attention = "attention"
+    mamba = "mamba"
+
+
 class Counter:
 
     def __init__(self, start: int = 0) -> None:

vllm/v1/worker/gpu_model_runner.py

@@ -15,8 +15,8 @@ from vllm.logger import init_logger
 from vllm.model_executor.model_loader import get_model
 from vllm.multimodal import MultiModalKwargs
 from vllm.sampling_params import SamplingType
-from vllm.utils import (STR_DTYPE_TO_TORCH_DTYPE, DeviceMemoryProfiler, cdiv,
+from vllm.utils import (STR_DTYPE_TO_TORCH_DTYPE, DeviceMemoryProfiler,
-                        is_pin_memory_available)
+                        LayerBlockType, cdiv, is_pin_memory_available)
 from vllm.v1.attention.backends.flash_attn import (FlashAttentionBackend,
                                                    FlashAttentionMetadata)
 from vllm.v1.outputs import ModelRunnerOutput
@@ -68,8 +68,8 @@ class GPUModelRunner:
         self.max_num_tokens = scheduler_config.max_num_batched_tokens
 
         # Model-related.
-        self.num_attn_layers = model_config.get_num_attention_layers(
+        self.num_attn_layers = model_config.get_num_layers_by_block_type(
-            parallel_config)
+            parallel_config, LayerBlockType.attention)
         self.num_kv_heads = model_config.get_num_kv_heads(parallel_config)
         self.head_size = model_config.get_head_size()
         self.hidden_size = model_config.get_hidden_size()

vllm/v1/worker/gpu_worker.py

@@ -14,7 +14,7 @@ from vllm.distributed import (ensure_model_parallel_initialized,
 from vllm.logger import init_logger
 from vllm.model_executor import set_random_seed
 from vllm.platforms import current_platform
-from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE, get_dtype_size
+from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE, LayerBlockType, get_dtype_size
 from vllm.v1.core.scheduler import SchedulerOutput
 from vllm.v1.outputs import ModelRunnerOutput
 from vllm.v1.worker.gpu_model_runner import GPUModelRunner
@@ -260,8 +260,8 @@ def _get_cache_block_size(
 ) -> int:
     head_size = model_config.get_head_size()
     num_heads = model_config.get_num_kv_heads(parallel_config)
-    num_attention_layers = model_config.get_num_attention_layers(
+    num_attention_layers = model_config.get_num_layers_by_block_type(
-        parallel_config)
+        parallel_config, LayerBlockType.attention)
 
     key_cache_block = cache_config.block_size * num_heads * head_size
     value_cache_block = key_cache_block

vllm/worker/cache_engine.py

@@ -6,8 +6,8 @@ import torch
 from vllm.attention import get_attn_backend
 from vllm.config import CacheConfig, DeviceConfig, ModelConfig, ParallelConfig
 from vllm.logger import init_logger
-from vllm.utils import (STR_DTYPE_TO_TORCH_DTYPE, get_dtype_size,
+from vllm.utils import (STR_DTYPE_TO_TORCH_DTYPE, LayerBlockType,
-                        is_pin_memory_available)
+                        get_dtype_size, is_pin_memory_available)
 
 logger = init_logger(__name__)
 
@@ -34,8 +34,8 @@ class CacheEngine:
 
         self.head_size = model_config.get_head_size()
         # Models like Jamba, have mixed typed layers, E.g Mamba
-        self.num_attention_layers = model_config.get_num_attention_layers(
+        self.num_attention_layers = model_config.get_num_layers_by_block_type(
-            parallel_config)
+            parallel_config, LayerBlockType.attention)
         self.num_kv_heads = model_config.get_num_kv_heads(parallel_config)
 
         self.block_size = cache_config.block_size
@@ -105,8 +105,8 @@ class CacheEngine:
     ) -> int:
         head_size = model_config.get_head_size()
         num_heads = model_config.get_num_kv_heads(parallel_config)
-        num_attention_layers = model_config.get_num_attention_layers(
+        num_attention_layers = model_config.get_num_layers_by_block_type(
-            parallel_config)
+            parallel_config, LayerBlockType.attention)
 
         key_cache_block = cache_config.block_size * num_heads * head_size
         value_cache_block = key_cache_block