[Model] Add PLaMo2 (#14323)

Signed-off-by: Shinichi Hemmi <50256998+Alnusjaponica@users.noreply.github.com>
Signed-off-by: shemmi <shemmi@preferred.jp>
Co-authored-by: Kento Nozawa <nzw0301@preferred.jp>
Co-authored-by: Hiroaki Mikami <mhiroaki@preferred.jp>
Co-authored-by: Calvin Metzger <metzger@preferred.jp>

.buildkite/test-pipeline.yaml

@@ -400,8 +400,9 @@ steps:
     - pytest -v -s models/test_transformers.py
     - pytest -v -s models/test_registry.py
     # V1 Test: https://github.com/vllm-project/vllm/issues/14531
-    - VLLM_USE_V1=0 pytest -v -s models/test_initialization.py -k 'not llama4'
+    - VLLM_USE_V1=0 pytest -v -s models/test_initialization.py -k 'not llama4 and not plamo2'
     - VLLM_USE_V1=0 pytest -v -s models/test_initialization.py -k 'llama4'
+    - VLLM_USE_V1=0 pytest -v -s models/test_initialization.py -k 'plamo2'
 
 - label: Language Models Test (Standard) # 32min
   #mirror_hardwares: [amd]
@@ -411,6 +412,8 @@ steps:
   - tests/models/embedding/language
   - tests/models/encoder_decoder/language
   commands:
+    # Install causal-conv1d for plamo2 models here, as it is not compatible with pip-compile.
+    - pip install causal-conv1d
     - pytest -v -s models/decoder_only/language -m 'core_model or quant_model'
     - pytest -v -s models/embedding/language -m core_model
 
@@ -422,6 +425,8 @@ steps:
   - tests/models/embedding/language
   - tests/models/encoder_decoder/language
   commands:
+    # Install causal-conv1d for plamo2 models here, as it is not compatible with pip-compile.
+    - pip install causal-conv1d
     - pytest -v -s models/decoder_only/language -m 'not core_model and not quant_model'
     - pytest -v -s models/embedding/language -m 'not core_model'
 

docs/source/models/supported_models.md

@@ -497,6 +497,11 @@ See [this page](#generative-models) for more information on how to use generativ
   * `adept/persimmon-8b-base`, `adept/persimmon-8b-chat`, etc.
   *
   * ✅︎
+- * `Plamo2ForCausalLM`
+  * PLaMo2
+  * `pfnet/plamo-2-1b`, `pfnet/plamo-2-8b`, etc.
+  *
+  *
 - * `QWenLMHeadModel`
   * Qwen
   * `Qwen/Qwen-7B`, `Qwen/Qwen-7B-Chat`, etc.

requirements/test.in

@@ -27,6 +27,7 @@ torch==2.6.0
 torchaudio==2.6.0
 torchvision==0.21.0
 transformers_stream_generator # required for qwen-vl test
+mamba_ssm # required for plamo2 test
 matplotlib # required for qwen-vl test
 mistral_common[opencv] >= 1.5.4 # required for pixtral test
 num2words # required for smolvlm test

requirements/test.txt

@@ -111,6 +111,7 @@ einops==0.8.0
     # via
     #   -r requirements/test.in
     #   encodec
+    #   mamba-ssm
     #   vector-quantize-pytorch
     #   vocos
 einx==0.3.0
@@ -233,6 +234,8 @@ lxml==5.3.0
     # via
     #   blobfile
     #   sacrebleu
+mamba-ssm==2.2.4
+    # via -r requirements/test.in
 markdown-it-py==3.0.0
     # via rich
 markupsafe==3.0.2
@@ -268,6 +271,8 @@ mypy-extensions==1.0.0
     # via black
 networkx==3.2.1
     # via torch
+ninja==1.11.1.3
+    # via mamba-ssm
 nltk==3.9.1
     # via rouge-score
 num2words==0.5.14
@@ -360,6 +365,7 @@ packaging==24.1
     #   fastparquet
     #   huggingface-hub
     #   lazy-loader
+    #   mamba-ssm
     #   matplotlib
     #   peft
     #   plotly
@@ -571,6 +577,7 @@ sentencepiece==0.2.0
     # via mistral-common
 setuptools==75.8.0
     # via
+    #   mamba-ssm
     #   pytablewriter
     #   torch
 shellingham==1.5.4
@@ -627,6 +634,7 @@ torch==2.6.0
     #   encodec
     #   fastsafetensors
     #   lm-eval
+    #   mamba-ssm
     #   peft
     #   runai-model-streamer
     #   sentence-transformers
@@ -664,6 +672,7 @@ transformers==4.51.1
     #   -r requirements/test.in
     #   genai-perf
     #   lm-eval
+    #   mamba-ssm
     #   peft
     #   sentence-transformers
     #   transformers-stream-generator

tests/models/decoder_only/language/test_hybrid.py

@@ -9,9 +9,15 @@ from vllm.sampling_params import SamplingParams
 from ...utils import check_outputs_equal
 
 # This test is for the hybrid models
-MODELS = ["ai21labs/Jamba-tiny-dev", "Zyphra/Zamba2-1.2B-instruct"]
+MODELS = [
+    "ai21labs/Jamba-tiny-dev", "Zyphra/Zamba2-1.2B-instruct",
+    "pfnet/plamo-2-1b"
+]
 # Bamba at Fp32 is too big for the CI (L4 GPU).
 # MODELS = ["ai21labs/Jamba-tiny-dev", "ibm-ai-platform/Bamba-9B"]
+# Note: Running Plamo2 in transformers implementation requires to install
+# causal-conv1d package, which is not listed as a test dependency as it's
+# not compatible with pip-compile.
 
 
 @pytest.mark.parametrize("model", MODELS)
@@ -25,21 +31,11 @@ def test_models(
     dtype: str,
     max_tokens: int,
 ) -> None:
-
     # numeric error produces different generation
     if "Bamba" in model:
         example_prompts.pop(3)
 
-    model_kwargs = {
+    with hf_runner(model, dtype=dtype) as hf_model:
-        "use_mamba_kernels": False,  # mamba kernels are not installed so HF 
-        # don't use them
-    }
-    if "Zamba2" in model:
-        # Zamba2 HF implementation automatically checks if mamba kernels are
-        # installed
-        model_kwargs = {}
-
-    with hf_runner(model, dtype=dtype, model_kwargs=model_kwargs) as hf_model:
         hf_outputs = hf_model.generate_greedy(example_prompts, max_tokens)
 
     with vllm_runner(model, dtype=dtype) as vllm_model:
@@ -94,6 +90,10 @@ def test_mamba_prefill_chunking_with_parallel_sampling(
     # correctly for n > 1 decoding steps inside a
     # chunked prefill forward pass (where we have both prefills
     # and decoding together )
+
+    if 'plamo-2' in model:
+        dtype = "float"  # use a different dtype for plamo
+
     sampling_params = SamplingParams(n=3,
                                      temperature=1,
                                      seed=0,
@@ -125,20 +125,14 @@ def test_mamba_prefill_chunking(hf_runner, vllm_runner, example_prompts,
         example_prompts.pop(3)
         example_prompts.pop(2)
         dtype = "half"  # use a different dtype for Bamba
+
     elif "Zamba2" in model:
         example_prompts.pop(7)
         dtype = "half"
+    elif "plamo-2-1b" in model:
+        example_prompts.pop(7)
 
-    model_kwargs = {
+    with hf_runner(model, dtype=dtype) as hf_model:
-        "use_mamba_kernels": False,  # mamba kernels are not installed so HF 
-        # don't use them
-    }
-    if "Zamba2" in model:
-        # Zamba2 HF implementation automatically checks if mamba kernels are
-        # installed
-        model_kwargs = {}
-
-    with hf_runner(model, dtype=dtype, model_kwargs=model_kwargs) as hf_model:
         non_chunked = hf_model.generate_greedy(example_prompts, max_tokens)
 
     with vllm_runner(model,
@@ -208,7 +202,8 @@ def test_mamba_cache_cg_padding(
     # This test is for verifying that mamba cache is padded to CG captured
     # batch size. If it's not, a torch RuntimeError will be raised because
     # tensor dimensions aren't compatible
-    vllm_config = EngineArgs(model=model).create_engine_config()
+    vllm_config = EngineArgs(model=model,
+                             trust_remote_code=True).create_engine_config()
     while len(example_prompts) == vllm_config.pad_for_cudagraph(
             len(example_prompts)):
         example_prompts.append(example_prompts[0])

tests/models/registry.py

@@ -204,6 +204,8 @@ _TEXT_GENERATION_EXAMPLE_MODELS = {
                                             trust_remote_code=True),
     "PhiMoEForCausalLM": _HfExamplesInfo("microsoft/Phi-3.5-MoE-instruct",
                                          trust_remote_code=True),
+    "Plamo2ForCausalLM": _HfExamplesInfo("pfnet/plamo-2-1b",
+                                        trust_remote_code=True),
     "QWenLMHeadModel": _HfExamplesInfo("Qwen/Qwen-7B-Chat",
                                        trust_remote_code=True),
     "Qwen2ForCausalLM": _HfExamplesInfo("Qwen/Qwen2-7B-Instruct",

vllm/config.py

@@ -2838,6 +2838,13 @@ def _get_and_verify_dtype(
             else:
                 torch_dtype = config_dtype
 
+            if config.model_type == "plamo2":
+                logger.info(
+                    "For PLaMo2, we cast models to bfloat16 instead of using "
+                    "float16 by default. This is because float16 does not work."
+                )
+                torch_dtype = torch.bfloat16
+
             from vllm.platforms import current_platform
             if (current_platform.is_cpu()
                     and current_platform.get_cpu_architecture()
@@ -2867,6 +2874,11 @@ def _get_and_verify_dtype(
                     "using float16 by default. Please specify `dtype` if you "
                     "want to use float16.")
                 torch_dtype = torch.bfloat16
+        elif dtype == "float16" and config.model_type == "plamo2":
+            logger.warning(
+                "For PLaMo2, using float16 is unstable and might cause "
+                "unexpected behavior. Please use bfloat16 or float32 instead.")
+            torch_dtype = torch.float16
         else:
             if dtype not in _STR_DTYPE_TO_TORCH_DTYPE:
                 raise ValueError(f"Unknown dtype: {dtype}")

vllm/model_executor/models/plamo2.py

@@ -0,0 +1,746 @@
+# SPDX-License-Identifier: Apache-2.0
+"""Inference-only PLaMo2 model."""
+import math
+from typing import Iterable, Optional, Tuple
+
+import torch
+from torch import nn
+from transformers import PretrainedConfig, PreTrainedModel
+
+from vllm.attention.backends.abstract import AttentionMetadata
+from vllm.attention.layer import Attention
+from vllm.config import CacheConfig, VllmConfig
+from vllm.distributed import get_tensor_model_parallel_world_size
+from vllm.forward_context import get_forward_context
+from vllm.model_executor.layers.layernorm import RMSNorm
+from vllm.model_executor.layers.linear import (ColumnParallelLinear,
+                                               MergedColumnParallelLinear,
+                                               QKVParallelLinear,
+                                               RowParallelLinear)
+from vllm.model_executor.layers.logits_processor import LogitsProcessor
+from vllm.model_executor.layers.mamba.ops.causal_conv1d import (
+    causal_conv1d_fn, causal_conv1d_update)
+from vllm.model_executor.layers.mamba.ops.mamba_ssm import (
+    selective_scan_fn, selective_state_update)
+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 (
+    DEFAULT_VOCAB_PADDING_SIZE, ParallelLMHead, VocabParallelEmbedding)
+from vllm.model_executor.model_loader.weight_utils import (
+    composed_weight_loader, default_weight_loader, sharded_weight_loader)
+from vllm.model_executor.models.interfaces import (HasInnerState, IsHybrid,
+                                                   SupportsV0Only)
+from vllm.model_executor.models.mamba_cache import (MambaCacheManager,
+                                                    MambaCacheParams)
+from vllm.model_executor.models.utils import maybe_prefix
+from vllm.model_executor.sampling_metadata import SamplingMetadata
+from vllm.model_executor.utils import set_weight_attrs
+from vllm.sequence import IntermediateTensors
+from vllm.utils import LayerBlockType
+
+
+# Only used for type hinting.
+class Plamo2Config(PretrainedConfig):  # type: ignore
+    model_type: str = "plamo2"
+
+    hidden_size: int
+    num_hidden_layers: int
+    rms_norm_eps: float
+    # Attention
+    num_attention_heads: int
+    hidden_size_per_head: int
+    num_key_value_heads: int
+    # Mamba
+    mamba_d_state: int
+    mamba_d_conv: int
+    mamba_num_heads: int
+    mamba_step: int
+    # MLP
+    intermediate_size: int
+    # Tokenizer
+    vocab_size: int
+
+
+class Plamo2PreTrainedModel(PreTrainedModel):  # type: ignore
+
+    def _init_weights(self, module: torch.nn.Module) -> None:
+        std = 0.02
+        if isinstance(module, nn.Linear):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.bias is not None:
+                module.bias.data.zero_()
+        elif isinstance(module, nn.Embedding):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.padding_idx is not None:
+                module.weight.data[module.padding_idx].zero_()
+
+
+def get_initial_dt_bias(num_heads: int) -> torch.Tensor:
+    dt_min = 0.001
+    dt_max = 0.1
+    dt = torch.exp(
+        torch.rand(num_heads) * (math.log(dt_max) - math.log(dt_min)) +
+        math.log(dt_min))
+    dt = torch.clamp(dt, 1e-4)
+    inv_dt = dt + torch.log(-torch.expm1(-dt))
+    return inv_dt
+
+
+def is_mamba(config: Plamo2Config, i: int) -> bool:
+    assert config.mamba_step > 1
+
+    if config.num_hidden_layers <= (config.mamba_step // 2):
+        # use attention in last layer
+        return i != config.num_hidden_layers - 1
+    return (i % config.mamba_step) != (config.mamba_step // 2)
+
+
+# TODO(Shinichi): Replace this with RMSNorm.
+def _rms_norm(hidden_states: torch.Tensor, weight: torch.Tensor,
+              eps: float) -> torch.Tensor:
+    input_shape = hidden_states.shape
+    hidden_states = hidden_states.reshape(input_shape[:-1] + weight.shape)
+    input_dtype = hidden_states.dtype
+    hidden_states = hidden_states.to(torch.float32)
+    variance = hidden_states.pow(2).mean(-1, keepdim=True)
+    hidden_states = hidden_states * torch.rsqrt(variance + eps)
+    hidden_states = hidden_states.to(input_dtype)
+    hidden_states = weight * hidden_states
+    return hidden_states.reshape(input_shape)
+
+
+def _swiglu(h: torch.Tensor) -> torch.Tensor:
+    h0, h1 = h.chunk(2, dim=-1)
+    return torch.nn.functional.silu(h0) * h1
+
+
+# Adapted from transformers.models.mamba.modeling_mamba.MambaMixer
+class Plamo2MambaMixer(nn.Module):
+    # TODO(Shinichi): Rebase on Mamba2 implementation.
+
+    def __init__(self,
+                 config: Plamo2Config,
+                 cache_config: CacheConfig,
+                 quant_config: QuantizationConfig,
+                 max_model_len: int,
+                 prefix: str = "",
+                 **kwargs) -> None:
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.ssm_state_size = config.mamba_d_state
+        self.conv_kernel_size = config.mamba_d_conv
+        self.intermediate_size = (config.mamba_num_heads *
+                                  config.hidden_size_per_head)
+        self.hidden_size_per_head = config.hidden_size_per_head
+        self.num_heads = config.mamba_num_heads
+        self.time_step_rank = max(64, self.hidden_size // 16)
+        self.use_conv_bias = False
+        self.use_bias = False
+        self.conv1d = ColumnParallelLinear(
+            input_size=self.conv_kernel_size,
+            output_size=self.intermediate_size,
+            bias=self.use_conv_bias,
+        )
+        # unsqueeze to fit conv1d weights shape into the linear weights shape.
+        # Can't do this in `weight_loader` since it already exists in
+        # `ColumnParallelLinear` and `set_weight_attrs`
+        # doesn't allow to override it
+        self.conv1d.weight.data = self.conv1d.weight.data.unsqueeze(1)
+
+        self.in_proj = MergedColumnParallelLinear(
+            self.hidden_size,
+            [self.intermediate_size] * 2,
+            bias=self.use_bias,
+            prefix=f"{prefix}.in_proj",
+        )
+        # selective projection used to make dt, B and C input dependent
+        self.bcdt_proj = RowParallelLinear(
+            self.intermediate_size,
+            self.time_step_rank + self.ssm_state_size * 2,
+            bias=False,
+            prefix=f"{prefix}.bcdt_proj",
+        )
+        # time step projection (discretization) -
+        # In the forward we need to apply dt_proj without the bias,
+        # as the bias is added in the selective scan kernel.
+        self.dt_proj = ColumnParallelLinear(
+            self.time_step_rank,
+            self.num_heads,
+            bias=False,
+            prefix=f"{prefix}.dt_proj",
+        )
+        self.dt_bias = torch.nn.Parameter(get_initial_dt_bias(self.num_heads))
+
+        tp_size = get_tensor_model_parallel_world_size()
+        self.A = nn.Parameter(
+            torch.empty(
+                self.intermediate_size // tp_size,
+                self.ssm_state_size,
+                dtype=torch.float32,
+            ))
+        self.D = nn.Parameter(torch.ones(self.intermediate_size // tp_size))
+
+        set_weight_attrs(self.D, {"weight_loader": sharded_weight_loader(0)})
+        a_weight_loader = composed_weight_loader(
+            sharded_weight_loader(0), lambda x: -torch.exp(x.float()))
+        set_weight_attrs(self.A, {"weight_loader": a_weight_loader})
+
+        self.out_proj = RowParallelLinear(
+            self.intermediate_size,
+            self.hidden_size,
+            bias=self.use_bias,
+            input_is_parallel=True,
+            prefix=f"{prefix}.out_proj",
+        )
+        # The activation function is fixed to SiLU.
+        self.activation = "silu"
+
+        self.dt_norm = RMSNorm(self.time_step_rank, eps=config.rms_norm_eps)
+        self.B_norm = RMSNorm(self.ssm_state_size, eps=config.rms_norm_eps)
+        self.C_norm = RMSNorm(self.ssm_state_size, eps=config.rms_norm_eps)
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        mamba_cache_params: MambaCacheParams,
+        **kwargs,
+    ) -> torch.Tensor:
+
+        attn_metadata: AttentionMetadata = get_forward_context().attn_metadata
+
+        # 1. Gated MLP's linear projection
+        projected_states = self.in_proj(hidden_states)[0]
+        # Reshaping the projected states as in modeling_plamo.py.
+        length = len(hidden_states)
+        projected_states = projected_states.reshape(length, self.num_heads, -1)
+        gate, hidden_states = torch.split(
+            projected_states,
+            [self.hidden_size_per_head, self.hidden_size_per_head],
+            dim=-1)
+        hidden_states = hidden_states.reshape(length, -1).transpose(0, 1)
+        gate = gate.reshape(length, -1).transpose(0, 1)
+
+        # 2. Convolution sequence transformation
+        conv_weights = self.conv1d.weight.view(self.conv1d.weight.size(0),
+                                               self.conv1d.weight.size(2))
+
+        if attn_metadata.query_start_loc is not None \
+            and attn_metadata.context_lens_tensor is not None:
+            # |---------- N-1 iteration --------|
+            # |---------------- N iteration ---------------------|
+            # |- tokenA -|......................|-- newTokens ---|
+            # |---------- context_len ----------|
+            # |-------------------- seq_len ---------------------|
+            #                                   |-- query_len ---|
+            hidden_states = causal_conv1d_fn(
+                hidden_states,
+                conv_weights,
+                self.conv1d.bias,
+                activation=self.activation,
+                conv_states=mamba_cache_params.conv_state,
+                has_initial_state=attn_metadata.context_lens_tensor > 0,
+                cache_indices=mamba_cache_params.state_indices_tensor,
+                query_start_loc=attn_metadata.query_start_loc)
+        else:
+            hidden_states = causal_conv1d_update(
+                hidden_states.transpose(0, 1),
+                mamba_cache_params.conv_state,
+                conv_weights,
+                self.conv1d.bias,
+                self.activation,
+                conv_state_indices=mamba_cache_params.state_indices_tensor)
+            hidden_states = hidden_states.transpose(0, 1)
+
+        # 3. State Space Model sequence transformation
+        # 3.a. input varying initialization of time_step, B and C
+        ssm_parameters = self.bcdt_proj(hidden_states.transpose(-2, -1))[0]
+
+        # Splitting the ssm_parameters as in modeling_plamo.py.
+        B, C, time_step = torch.split(
+            ssm_parameters,
+            [self.ssm_state_size, self.ssm_state_size, self.time_step_rank],
+            dim=-1,
+        )
+        time_step = self.dt_norm(time_step.contiguous())
+        B = self.B_norm(B.contiguous())
+        C = self.C_norm(C.contiguous())
+
+        discrete_time_step = self.dt_proj(time_step)[0].transpose(-2, -1)
+        # 3.c perform the recurrence y ← SSM(A, B, C)(x)
+        time_proj_bias = (self.dt_bias.float() if hasattr(
+            self.dt_proj, "bias") else None)
+
+        # Broadcasting as in modeling_plamo.py.
+        discrete_time_step = discrete_time_step.transpose(
+            0, 1)[..., None].expand(-1, -1, self.hidden_size_per_head)
+        discrete_time_step = discrete_time_step.reshape(
+            -1, self.intermediate_size).transpose(0, 1)
+        time_proj_bias = time_proj_bias[...,
+                                        None].expand(-1,
+                                                     self.hidden_size_per_head)
+        time_proj_bias = time_proj_bias.reshape(self.intermediate_size)
+
+        if attn_metadata.query_start_loc is not None \
+            and attn_metadata.context_lens_tensor is not None:
+            scan_outputs = selective_scan_fn(
+                hidden_states,
+                mamba_cache_params.ssm_state,
+                discrete_time_step,
+                self.A,
+                B.transpose(-2, -1),
+                C.transpose(-2, -1),
+                self.D.float(),
+                gate,
+                time_proj_bias,
+                delta_softplus=True,
+                cache_indices=mamba_cache_params.state_indices_tensor,
+                has_initial_state=attn_metadata.context_lens_tensor > 0,
+                query_start_loc=attn_metadata.query_start_loc)
+        else:
+            scan_outputs = selective_state_update(
+                mamba_cache_params.ssm_state,
+                hidden_states.transpose(0, 1),
+                discrete_time_step.transpose(0, 1),
+                self.A,
+                B,
+                C,
+                self.D,
+                gate.transpose(0, 1),
+                time_proj_bias,
+                dt_softplus=True,
+                state_batch_indices=mamba_cache_params.state_indices_tensor)
+            scan_outputs = scan_outputs.transpose(0, 1)
+
+        # 4. Final linear projection
+        contextualized_states = self.out_proj(scan_outputs.transpose(-2,
+                                                                     -1))[0]
+        return contextualized_states
+
+
+class DenseMLP(nn.Module):
+
+    def __init__(
+        self,
+        config: Plamo2Config,
+        quant_config: Optional[QuantizationConfig] = None,
+        prefix: str = "",
+    ) -> None:
+        super().__init__()
+        self.hidden_size = config.hidden_size
+        self.intermediate_size = config.intermediate_size
+        self.gate_up_proj = MergedColumnParallelLinear(
+            self.hidden_size, [self.intermediate_size] * 2,
+            bias=False,
+            prefix=f"{prefix}.gate_up_proj",
+            quant_config=quant_config)
+        self.down_proj = RowParallelLinear(self.intermediate_size,
+                                           self.hidden_size,
+                                           bias=False,
+                                           prefix=f"{prefix}.down_proj",
+                                           quant_config=quant_config)
+
+    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
+        h = self.gate_up_proj(hidden_states)[0]
+        h = _swiglu(h)
+        output, _ = self.down_proj(h)
+        return output  # type: ignore
+
+
+class Plamo2AttentionMixer(nn.Module):
+
+    def __init__(self,
+                 config: Plamo2Config,
+                 cache_config: CacheConfig,
+                 quant_config: QuantizationConfig,
+                 max_model_len: int | None = None,
+                 prefix: str = "",
+                 **kwargs) -> None:
+        super().__init__()
+        self.hidden_size = config.hidden_size
+        tp_size = get_tensor_model_parallel_world_size()
+        self.total_num_heads = config.num_attention_heads
+        assert self.total_num_heads % tp_size == 0
+        self.num_heads = self.total_num_heads // tp_size
+        self.total_num_kv_heads = config.num_key_value_heads
+        if self.total_num_kv_heads >= tp_size:
+            # Number of KV heads is greater than TP size, so we partition
+            # the KV heads across multiple tensor parallel GPUs.
+            assert self.total_num_kv_heads % tp_size == 0
+        else:
+            # Number of KV heads is less than TP size, so we replicate
+            # the KV heads across multiple tensor parallel GPUs.
+            assert tp_size % self.total_num_kv_heads == 0
+        self.num_kv_heads = max(1, self.total_num_kv_heads // tp_size)
+        self.head_dim = config.hidden_size_per_head
+        self.q_size = self.num_heads * self.head_dim
+        self.kv_size = self.num_kv_heads * self.head_dim
+        self.scaling = self.head_dim**-0.5
+
+        self.qkv_proj = QKVParallelLinear(
+            config.hidden_size,
+            self.head_dim,
+            self.total_num_heads,
+            self.total_num_kv_heads,
+            bias=False,
+            quant_config=quant_config,
+        )
+        self.o_proj = RowParallelLinear(self.total_num_heads * self.head_dim,
+                                        config.hidden_size,
+                                        bias=False,
+                                        quant_config=quant_config)
+
+        self.rope_theta = config.rope_theta if hasattr(config,
+                                                       "rope_theta") else 10000
+        self.rope_scaling = config.rope_scaling if hasattr(
+            config, "rope_scaling") else None
+
+        assert max_model_len is not None, "max_model_len must be provided"
+        self.rotary_emb = get_rope(
+            self.head_dim,
+            rotary_dim=self.head_dim,
+            max_position=max_model_len,
+            base=self.rope_theta,
+            rope_scaling=self.rope_scaling,
+        )
+        self.q_weight = torch.nn.Parameter(
+            torch.ones((self.num_heads, config.hidden_size_per_head)))
+        self.k_weight = torch.nn.Parameter(
+            torch.ones((self.num_kv_heads, config.hidden_size_per_head)))
+
+        self.attn = Attention(
+            self.num_heads,
+            self.head_dim,
+            self.scaling,
+            num_kv_heads=self.num_kv_heads,
+            cache_config=cache_config,
+            prefix=f"{prefix}.attn",
+        )
+
+    def forward(
+        self,
+        positions: torch.Tensor,
+        hidden_states: torch.Tensor,
+        residual: Optional[torch.Tensor],
+        **kwargs,
+    ) -> torch.Tensor:
+        qkv, _ = self.qkv_proj(hidden_states)
+        q, k, v = qkv.split([self.q_size, self.kv_size, self.kv_size], dim=-1)
+        q = _rms_norm(q, self.q_weight, 1e-6)
+        k = _rms_norm(k, self.k_weight, 1e-6)
+        q, k = self.rotary_emb(positions, q, k)
+        attn_output = self.attn(q, k, v)
+        output, _ = self.o_proj(attn_output)
+        return output
+
+
+class Plamo2DecoderLayer(nn.Module):
+
+    def __init__(self,
+                 vllm_config: VllmConfig,
+                 layer_idx: int,
+                 max_model_len: int | None = None,
+                 prefix: str = "",
+                 **kwargs) -> None:
+        super().__init__()
+        config = vllm_config.model_config.hf_config
+        cache_config = vllm_config.cache_config
+        quant_config = vllm_config.quant_config
+        max_model_len = vllm_config.scheduler_config.max_model_len
+
+        self.is_mamba = is_mamba(config, layer_idx)
+        if self.is_mamba:
+            self.mixer = Plamo2MambaMixer(config=config,
+                                          cache_config=cache_config,
+                                          quant_config=quant_config,
+                                          max_model_len=max_model_len,
+                                          prefix=f"{prefix}.mixer")
+        else:
+            self.mixer = Plamo2AttentionMixer(config=config,
+                                              cache_config=cache_config,
+                                              quant_config=quant_config,
+                                              max_model_len=max_model_len,
+                                              prefix=f"{prefix}.mixer")
+
+        self.mlp = DenseMLP(config=config,
+                            quant_config=quant_config,
+                            prefix=f"{prefix}.mlp")
+        self.pre_mixer_norm = RMSNorm(config.hidden_size,
+                                      eps=config.rms_norm_eps)
+        self.post_mixer_norm = RMSNorm(config.hidden_size,
+                                       eps=config.rms_norm_eps)
+        self.pre_mlp_norm = RMSNorm(config.hidden_size,
+                                    eps=config.rms_norm_eps)
+        self.post_mlp_norm = RMSNorm(config.hidden_size,
+                                     eps=config.rms_norm_eps)
+
+    def forward(
+        self,
+        positions: torch.Tensor,
+        hidden_states: torch.Tensor,
+        residual: Optional[torch.Tensor],
+        mamba_cache_params: MambaCacheParams,
+        **kwargs,
+    ):
+        if residual is None:
+            residual = hidden_states
+            hidden_states = self.pre_mixer_norm(hidden_states)
+        else:
+            hidden_states, residual = self.pre_mixer_norm(
+                hidden_states, residual)
+
+        hidden_states = self.mixer(positions=positions,
+                                   hidden_states=hidden_states,
+                                   residual=residual,
+                                   mamba_cache_params=mamba_cache_params)
+        hidden_states = self.post_mixer_norm(hidden_states)
+        # Fully Connected
+        hidden_states, residual = self.pre_mlp_norm(hidden_states, residual)
+        hidden_states = self.mlp(hidden_states)
+        hidden_states = self.post_mlp_norm(hidden_states)
+        return hidden_states, residual
+
+
+class Plamo2Decoder(torch.nn.Module):
+
+    def __init__(self, vllm_config: VllmConfig, prefix: str = "") -> None:
+        super().__init__()
+        num_hidden_layers = vllm_config.model_config.hf_config.num_hidden_layers
+
+        self.layers = nn.ModuleList([
+            Plamo2DecoderLayer(vllm_config=vllm_config,
+                               layer_idx=i,
+                               prefix=f"{prefix}.layers.{i}")
+            for i in range(num_hidden_layers)
+        ])
+
+    def forward(
+        self,
+        positions: torch.Tensor,
+        hidden_states: torch.Tensor,
+        residual: Optional[torch.Tensor],
+        mamba_cache_params: MambaCacheParams,
+    ) -> torch.Tensor:
+        mamba_cache_index = 0
+        for layer in self.layers:
+            layer_mamba_cache_params = None
+            if layer.is_mamba:
+                layer_mamba_cache_params = mamba_cache_params.at_layer_idx(
+                    mamba_cache_index)
+                mamba_cache_index += 1
+
+            hidden_states, residual = layer(
+                positions=positions,
+                hidden_states=hidden_states,
+                residual=residual,
+                mamba_cache_params=layer_mamba_cache_params)
+        return hidden_states, residual
+
+
+class Plamo2Model(Plamo2PreTrainedModel):
+
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
+        super().__init__(vllm_config.model_config.hf_config)
+
+        config = vllm_config.model_config.hf_config
+
+        self.config = config
+        self.padding_idx = config.pad_token_id
+        self.vocab_size = config.vocab_size
+        self.org_vocab_size = config.vocab_size
+
+        self.embed_tokens = VocabParallelEmbedding(
+            self.vocab_size,
+            config.hidden_size,
+            org_num_embeddings=config.vocab_size,
+            prefix=f"{prefix}.embed_tokens",
+        )
+        self.layers = Plamo2Decoder(vllm_config, prefix=f"{prefix}.layers")
+        self.norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_init()
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        mamba_cache_params: MambaCacheParams,
+        intermediate_tensors: Optional[IntermediateTensors] = None,
+        inputs_embeds: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        # TODO(Shinichi): Implement pipeline parallelism.
+        hidden_states = self.embed_tokens(input_ids)
+        residual = None
+
+        hidden_states, residual = self.layers(
+            positions=positions,
+            hidden_states=hidden_states,
+            residual=residual,
+            mamba_cache_params=mamba_cache_params)
+        hidden_states, _ = self.norm(hidden_states, residual)
+        return hidden_states
+
+
+class Plamo2ForCausalLM(Plamo2PreTrainedModel, HasInnerState, IsHybrid,
+                        SupportsV0Only):
+    packed_modules_mapping = {
+        "qkv_proj": [
+            "q_proj",
+            "k_proj",
+            "v_proj",
+        ],
+    }
+
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = "") -> None:
+        config = vllm_config.model_config.hf_config
+        scheduler_config = vllm_config.scheduler_config
+        assert not vllm_config.cache_config.enable_prefix_caching, \
+            "PLaMo2 currently does not support prefix caching"
+
+        super().__init__(config)
+        self.config = config
+        self.vllm_config = vllm_config
+        self.model_config = vllm_config.model_config
+        self.scheduler_config = scheduler_config
+
+        # ModelConfig.get_head_size assumes head_dim is set or calculated as
+        # hidden_size // num_attention_heads. However, this is not always
+        # the case for PLaMo2, as indicated by the FIXME comment.
+        self.config.head_dim = self.config.hidden_size_per_head
+
+        self.model = Plamo2Model(vllm_config=vllm_config,
+                                 prefix=maybe_prefix(prefix, "model"))
+        self.vocab_size = self.config.vocab_size
+        self.unpadded_vocab_size = self.config.vocab_size
+        num_embeddings = ((self.vocab_size + 15) // 16) * 16
+        self.lm_head = ParallelLMHead(
+            num_embeddings,
+            self.config.hidden_size,
+            org_num_embeddings=self.config.vocab_size,
+            padding_size=DEFAULT_VOCAB_PADDING_SIZE,
+            prefix=f"{prefix}.lm_head",
+        )
+        if self.config.tie_word_embeddings:
+            self.lm_head = self.lm_head.tie_weights(self.model.embed_tokens)
+
+        # Used to track and store by the Mamba cache between steps.
+        self.mamba_cache: Optional[MambaCacheManager] = None
+
+        self.logits_processor = LogitsProcessor(self.unpadded_vocab_size,
+                                                self.config.vocab_size)
+        self.sampler = get_sampler()
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    def forward(self,
+                input_ids: torch.Tensor,
+                positions: torch.Tensor,
+                intermediate_tensors: Optional[IntermediateTensors] = None,
+                inputs_embeds: Optional[torch.Tensor] = None,
+                **kwargs):
+        if self.mamba_cache is None:
+            num_mamba_layers = self.model_config.get_num_layers_by_block_type(
+                self.vllm_config.parallel_config, LayerBlockType.mamba)
+
+            self.mamba_cache = MambaCacheManager(
+                self.vllm_config, self.lm_head.weight.dtype, num_mamba_layers,
+                *self._get_mamba_cache_shape())
+
+        mamba_cache_params = self.mamba_cache.current_run_tensors(**kwargs)
+
+        hidden_states = self.model(input_ids, positions, mamba_cache_params,
+                                   intermediate_tensors, inputs_embeds)
+        return hidden_states
+
+    def copy_inputs_before_cuda_graphs(self, input_buffers, **kwargs):
+        return self.mamba_cache.copy_inputs_before_cuda_graphs(
+            input_buffers, **kwargs)
+
+    def get_seqlen_agnostic_capture_inputs(self, batch_size: int):
+        return self.mamba_cache.get_seqlen_agnostic_capture_inputs(batch_size)
+
+    def _get_mamba_cache_shape(
+            self) -> Tuple[Tuple[int, int], Tuple[int, int]]:
+        world_size = get_tensor_model_parallel_world_size()
+        hidden_size = (self.config.mamba_num_heads *
+                       self.config.hidden_size_per_head)
+        conv_state_shape = (
+            hidden_size // world_size,
+            self.config.mamba_d_conv - 1,
+        )
+        temporal_state_shape = (
+            hidden_size // world_size,
+            self.config.mamba_d_state,
+        )
+        return conv_state_shape, temporal_state_shape
+
+    def compute_logits(
+        self,
+        hidden_states: torch.Tensor,
+        sampling_metadata: SamplingMetadata,
+    ) -> Optional[torch.Tensor]:
+        logits = self.logits_processor(self.lm_head, hidden_states,
+                                       sampling_metadata)
+        return logits
+
+    def sample(
+        self,
+        logits: Optional[torch.Tensor],
+        sampling_metadata: SamplingMetadata,
+    ) -> Optional[SamplerOutput]:
+        next_tokens = self.sampler(logits, sampling_metadata)
+        return next_tokens
+
+    def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
+        params_dict = dict(self.named_parameters())
+        for name, loaded_weight in weights:
+
+            # Both tie_word_embeddings=True and lm_head.weight in the safetensor
+            # at the same time causes dict key access error.
+            if name == "lm_head.weight" and self.config.tie_word_embeddings:
+                assert "lm_head.weight" not in params_dict
+                continue
+
+            # Update the weight names to be compatible with the vllm version
+            # of the model.
+            # Do not change the order of the replacements.
+            replacements = {
+                # Rename incompatible weight names.
+                ".A_log": ".A",
+                ".B_norm_weight": ".B_norm.weight",
+                ".C_norm_weight": ".C_norm.weight",
+                ".dt_norm_weight": ".dt_norm.weight",
+            }
+            # Apply replacements based on the defined mappings
+            for old, new in replacements.items():
+                if old in name:
+                    name = name.replace(old, new)
+
+            # Broadcast the loaded weight to match the model's parameter shape.
+            if ".A" in name:
+                loaded_weight = loaded_weight[:, None, None].expand(
+                    -1, self.config.hidden_size_per_head,
+                    self.config.mamba_d_state)
+                loaded_weight = loaded_weight.reshape(
+                    -1, self.config.mamba_d_state)
+            elif ".D" in name:
+                loaded_weight = loaded_weight[:, None].expand(
+                    -1, self.config.hidden_size_per_head)
+                loaded_weight = loaded_weight.reshape(-1)
+            # Offset parameter with vllm's RMSNorm haven't been supported yet.
+            if ".pre_mixer_norm" in name:
+                loaded_weight += 1.0
+            elif ".post_mixer_norm" in name:
+                loaded_weight += 1.0 / 5
+            elif ".pre_mlp_norm" in name:
+                loaded_weight += 1.0
+            elif ".post_mlp_norm" in name:
+                loaded_weight += 1.0 / (5**1.5)
+            elif "model.norm.weight" in name:
+                loaded_weight += 1.0
+
+            param = params_dict[name]
+            weight_loader = getattr(param, "weight_loader",
+                                    default_weight_loader)
+            weight_loader(param, loaded_weight)

vllm/model_executor/models/registry.py

@@ -99,6 +99,7 @@ _TEXT_GENERATION_MODELS = {
     "Phi3ForCausalLM": ("phi3", "Phi3ForCausalLM"),
     "Phi3SmallForCausalLM": ("phi3_small", "Phi3SmallForCausalLM"),
     "PhiMoEForCausalLM": ("phimoe", "PhiMoEForCausalLM"),
+    "Plamo2ForCausalLM": ("plamo2", "Plamo2ForCausalLM"),
     "QWenLMHeadModel": ("qwen", "QWenLMHeadModel"),
     "Qwen2ForCausalLM": ("qwen2", "Qwen2ForCausalLM"),
     "Qwen2MoeForCausalLM": ("qwen2_moe", "Qwen2MoeForCausalLM"),