jamba.py 24 KB
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# SPDX-License-Identifier: Apache-2.0
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"""Inference-only Jamba model."""
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from typing import Iterable, Optional, Set, Tuple
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import torch
from torch import nn
from transformers import JambaConfig

from vllm.attention.layer import Attention
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from vllm.config import CacheConfig, VllmConfig
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from vllm.distributed import get_tensor_model_parallel_world_size
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from vllm.distributed.parallel_state import get_pp_group
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from vllm.model_executor.layers.fused_moe import FusedMoE
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from vllm.model_executor.layers.layernorm import RMSNorm
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from vllm.model_executor.layers.linear import (QKVParallelLinear,
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                                               ReplicatedLinear,
                                               RowParallelLinear)
from vllm.model_executor.layers.logits_processor import LogitsProcessor
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from vllm.model_executor.layers.mamba.mamba_mixer import MambaMixer
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from vllm.model_executor.layers.pooler import Pooler, PoolingType
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from vllm.model_executor.layers.quantization import QuantizationConfig
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from vllm.model_executor.layers.sampler import SamplerOutput, get_sampler
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from vllm.model_executor.layers.vocab_parallel_embedding import (
    DEFAULT_VOCAB_PADDING_SIZE, ParallelLMHead, VocabParallelEmbedding)
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from vllm.model_executor.model_loader.weight_utils import default_weight_loader
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from vllm.model_executor.models.mamba_cache import (MambaCacheManager,
                                                    MambaCacheParams)
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from vllm.model_executor.pooling_metadata import PoolingMetadata
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from vllm.model_executor.sampling_metadata import SamplingMetadata
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from vllm.sequence import IntermediateTensors, PoolerOutput
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from vllm.utils import LayerBlockType
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from .interfaces import (HasInnerState, IsHybrid, SupportsLoRA, SupportsPP,
                         SupportsV0Only)
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from .utils import (is_pp_missing_parameter,
                    make_empty_intermediate_tensors_factory, make_layers,
                    maybe_prefix)
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class JambaMoE(nn.Module):

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    def __init__(self,
                 config: JambaConfig,
                 num_experts: Optional[int] = None,
                 top_k: Optional[int] = None,
                 params_dtype: Optional[torch.dtype] = None,
                 tp_size: Optional[int] = None,
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                 quant_config: Optional[QuantizationConfig] = None,
                 prefix: str = ""):
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        super().__init__()
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        self.num_total_experts = num_experts or config.num_experts
        self.top_k = top_k or config.num_experts_per_tok
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        self.hidden_size = config.hidden_size
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        self.intermediate_size = config.intermediate_size
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        if self.num_total_experts > 1:
            self.router = ReplicatedLinear(self.hidden_size,
                                           self.num_total_experts,
                                           bias=False,
                                           quant_config=None,
                                           params_dtype=params_dtype)

        self.experts = FusedMoE(self.num_total_experts,
                                self.top_k,
                                self.hidden_size,
                                self.intermediate_size,
                                tp_size=tp_size,
                                params_dtype=params_dtype,
                                reduce_results=True,
                                renormalize=False,
                                use_grouped_topk=False,
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                                quant_config=quant_config,
                                prefix=f"{prefix}.experts")
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    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
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        orig_shape = hidden_states.shape
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        hidden_states = hidden_states.view(-1, self.hidden_size)
        # router_logits: (batch * sequence_length, n_experts)
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        if self.num_total_experts > 1:
            router_logits, _ = self.router(hidden_states)
        else:
            router_logits = torch.ones((hidden_states.shape[0], 1),
                                       device=hidden_states.device,
                                       dtype=hidden_states.dtype)
        hidden_states = self.experts(hidden_states, router_logits)
        return hidden_states.view(orig_shape)
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class JambaMLP(JambaMoE):

    def __init__(self,
                 config: JambaConfig,
                 params_dtype: Optional[torch.dtype] = None,
                 tp_size: Optional[int] = None,
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                 quant_config: Optional[QuantizationConfig] = None,
                 prefix: str = ""):
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        super().__init__(config,
                         num_experts=1,
                         top_k=1,
                         params_dtype=params_dtype,
                         tp_size=tp_size,
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                         quant_config=quant_config,
                         prefix=prefix)
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class JambaMambaDecoderLayer(nn.Module):

    def __init__(self,
                 config: JambaConfig,
                 layer_idx: int,
                 cache_config: Optional[CacheConfig] = None,
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                 quant_config: Optional[QuantizationConfig] = None,
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                 is_lora_enabled: Optional[bool] = False,
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                 prefix: str = "",
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                 **kwargs) -> None:
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        super().__init__()
        self.config = config
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        self.is_lora_enabled = is_lora_enabled
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        self.mamba = MambaMixer(hidden_size= config.hidden_size,
                                ssm_state_size = config.mamba_d_state,
                                conv_kernel_size = config.mamba_d_conv,
                                intermediate_size = config.mamba_expand *\
                                                    config.hidden_size,
                                time_step_rank = config.mamba_dt_rank,
                                use_conv_bias = config.mamba_conv_bias,
                                use_bias = config.mamba_proj_bias,
                                use_rms_norm=True,
                                rms_norm_eps=config.rms_norm_eps,
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                                activation=config.hidden_act,
                                is_lora_enabled = self.is_lora_enabled
                                )
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        num_experts = config.layers_num_experts[layer_idx]
        ffn_layer_class = JambaMoE if num_experts > 1 else JambaMLP
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        self.feed_forward = ffn_layer_class(config,
                                            quant_config=quant_config,
                                            prefix=f"{prefix}.feed_forward")
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        self.input_layernorm = RMSNorm(config.hidden_size,
                                       eps=config.rms_norm_eps)
        self.pre_ff_layernorm = RMSNorm(config.hidden_size,
                                        eps=config.rms_norm_eps)

    def forward(
        self,
        hidden_states: torch.Tensor,
        residual: Optional[torch.Tensor],
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        mamba_cache_params: MambaCacheParams,
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        **kwargs,
    ):
        if residual is None:
            residual = hidden_states
            hidden_states = self.input_layernorm(hidden_states)
        else:
            hidden_states, residual = self.input_layernorm(
                hidden_states, residual)

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        hidden_states = self.mamba(hidden_states, mamba_cache_params)
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        # Fully Connected
        hidden_states, residual = self.pre_ff_layernorm(
            hidden_states, residual)
        hidden_states = self.feed_forward(hidden_states)
        return hidden_states, residual


class JambaAttentionDecoderLayer(nn.Module):

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    def __init__(self,
                 config: JambaConfig,
                 layer_idx: int,
                 cache_config: Optional[CacheConfig] = None,
                 quant_config: Optional[QuantizationConfig] = None,
                 prefix: str = "",
                 **kwargs) -> None:
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        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 // self.total_num_heads
        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.attn = Attention(
            self.num_heads,
            self.head_dim,
            self.scaling,
            num_kv_heads=self.num_kv_heads,
            cache_config=cache_config,
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            prefix=f"{prefix}.attn",
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        )

        num_experts = config.layers_num_experts[layer_idx]
        ffn_layer_class = JambaMoE if num_experts > 1 else JambaMLP
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        self.feed_forward = ffn_layer_class(config,
                                            quant_config=quant_config,
                                            prefix=f"{prefix}.feed_forward")
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        self.input_layernorm = RMSNorm(config.hidden_size,
                                       eps=config.rms_norm_eps)
        self.pre_ff_layernorm = RMSNorm(config.hidden_size,
                                        eps=config.rms_norm_eps)

    def self_attention(
        self,
        positions: torch.Tensor,
        hidden_states: 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)
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        attn_output = self.attn(q, k, v)
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        output, _ = self.o_proj(attn_output)
        return output

    def forward(
        self,
        positions: torch.Tensor,
        hidden_states: torch.Tensor,
        residual: Optional[torch.Tensor],
        **kwargs,
    ):
        if residual is None:
            residual = hidden_states
            hidden_states = self.input_layernorm(hidden_states)
        else:
            hidden_states, residual = self.input_layernorm(
                hidden_states, residual)

        hidden_states = self.self_attention(
            positions=positions,
            hidden_states=hidden_states,
        )
        # Fully Connected
        hidden_states, residual = self.pre_ff_layernorm(
            hidden_states, residual)
        hidden_states = self.feed_forward(hidden_states)
        return hidden_states, residual


ALL_DECODER_LAYER_TYPES = {
    "attention": JambaAttentionDecoderLayer,
    "mamba": JambaMambaDecoderLayer
}


class JambaModel(nn.Module):

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    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
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        super().__init__()
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        config = vllm_config.model_config.hf_config
        cache_config = vllm_config.cache_config
        quant_config = vllm_config.quant_config
        lora_config = vllm_config.lora_config

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        self.config = config
        lora_vocab = ((lora_config.lora_extra_vocab_size *
                       (lora_config.max_loras or 1)) if lora_config else 0)
        self.vocab_size = config.vocab_size + lora_vocab
        self.org_vocab_size = config.vocab_size

        self.embed_tokens = VocabParallelEmbedding(
            self.vocab_size,
            config.hidden_size,
            org_num_embeddings=config.vocab_size,
        )

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        extra_kwargs = {"is_lora_enabled": bool(vllm_config.lora_config)}

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        def get_layer(prefix: str):
            layer_idx = int(prefix.rsplit(".", 1)[1])
            layer_class = ALL_DECODER_LAYER_TYPES[
                config.layers_block_type[layer_idx]]
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            return layer_class(config,
                               layer_idx,
                               cache_config,
                               quant_config=quant_config,
                               prefix=prefix,
                               **extra_kwargs)
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        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))

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        self.final_layernorm = RMSNorm(config.hidden_size,
                                       eps=config.rms_norm_eps)

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    def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
        return self.embed_tokens(input_ids)

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    def forward(
        self,
        input_ids: torch.Tensor,
        positions: torch.Tensor,
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        mamba_cache_params: MambaCacheParams,
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        intermediate_tensors: Optional[IntermediateTensors] = None,
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        inputs_embeds: Optional[torch.Tensor] = None,
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    ) -> torch.Tensor:
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        if get_pp_group().is_first_rank:
            if inputs_embeds is not None:
                hidden_states = inputs_embeds
            else:
                hidden_states = self.get_input_embeddings(input_ids)
            residual = None
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        else:
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            assert intermediate_tensors is not None
            hidden_states = intermediate_tensors["hidden_states"]
            residual = intermediate_tensors["residual"]

        kv_cache_index = 0
        mamba_cache_index = 0
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        for layer in self.layers[self.start_layer:self.end_layer]:
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            layer_mamba_cache_params = None
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            if isinstance(layer, JambaAttentionDecoderLayer):
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                kv_cache_index += 1
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            if isinstance(layer, JambaMambaDecoderLayer):
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                current_state_layer = mamba_cache_index
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                layer_mamba_cache_params = mamba_cache_params.at_layer_idx(
                    current_state_layer)
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                mamba_cache_index += 1
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            hidden_states, residual = layer(
                positions=positions,
                hidden_states=hidden_states,
                residual=residual,
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                mamba_cache_params=layer_mamba_cache_params)
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        if not get_pp_group().is_last_rank:
            return IntermediateTensors({
                "hidden_states": hidden_states,
                "residual": residual
            })
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        hidden_states, _ = self.final_layernorm(hidden_states, residual)
        return hidden_states


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class JambaForCausalLM(nn.Module, HasInnerState, SupportsLoRA, SupportsPP,
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                       IsHybrid, SupportsV0Only):
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    packed_modules_mapping = {
        "qkv_proj": [
            "q_proj",
            "k_proj",
            "v_proj",
        ],
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        "in_proj": ["in_proj"],
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    }

    # LoRA specific attributes
    embedding_modules = {
        "embed_tokens": "input_embeddings",
        "lm_head": "output_embeddings",
    }
    embedding_padding_modules = ["lm_head"]

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    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
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        config = vllm_config.model_config.hf_config
        cache_config = vllm_config.cache_config
        lora_config = vllm_config.lora_config
        scheduler_config = vllm_config.scheduler_config
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        assert not cache_config.enable_prefix_caching, \
            "Jamba currently does not support prefix caching"

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        super().__init__()
        self.config = config
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        self.vllm_config = vllm_config
        self.model_config = vllm_config.model_config
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        self.scheduler_config = scheduler_config
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        self.model = JambaModel(vllm_config=vllm_config,
                                prefix=maybe_prefix(prefix, "model"))
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        self.unpadded_vocab_size = config.vocab_size
        if lora_config:
            self.unpadded_vocab_size += lora_config.lora_extra_vocab_size
        self.lm_head = ParallelLMHead(
            self.unpadded_vocab_size,
            config.hidden_size,
            org_num_embeddings=config.vocab_size,
            padding_size=DEFAULT_VOCAB_PADDING_SIZE
            # We need bigger padding if using lora for kernel
            # compatibility
            if not lora_config else lora_config.lora_vocab_padding_size,
        )
        # Used to track and store by the Mamba cache between steps.
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        self.mamba_cache: Optional[MambaCacheManager] = None

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        self.logits_processor = LogitsProcessor(self.unpadded_vocab_size,
                                                config.vocab_size)
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        self.sampler = get_sampler()
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        self.make_empty_intermediate_tensors = (
            self.model.make_empty_intermediate_tensors)

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    def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
        return self.model.get_input_embeddings(input_ids)

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    def forward(self,
                input_ids: torch.Tensor,
                positions: torch.Tensor,
                intermediate_tensors: Optional[IntermediateTensors] = None,
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                inputs_embeds: Optional[torch.Tensor] = None,
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                **kwargs):
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        if self.mamba_cache is None:
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            num_mamba_layers = self.model_config.get_num_layers_by_block_type(
                self.vllm_config.parallel_config, LayerBlockType.mamba)
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            self.mamba_cache = MambaCacheManager(
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                self.vllm_config, self.lm_head.weight.dtype, num_mamba_layers,
                *self._get_mamba_cache_shape())
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        mamba_cache_params = self.mamba_cache.current_run_tensors(**kwargs)

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        hidden_states = self.model(input_ids, positions, mamba_cache_params,
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                                   intermediate_tensors, inputs_embeds)
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        return hidden_states

    def copy_inputs_before_cuda_graphs(self, input_buffers, **kwargs):
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        return self.mamba_cache.copy_inputs_before_cuda_graphs(
            input_buffers, **kwargs)
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    def get_seqlen_agnostic_capture_inputs(self, batch_size: int):
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        return self.mamba_cache.get_seqlen_agnostic_capture_inputs(batch_size)
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    def _get_mamba_cache_shape(
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            self) -> Tuple[Tuple[int, int], Tuple[int, int]]:
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        world_size = get_tensor_model_parallel_world_size()
        hidden_size = self.config.hidden_size
        conv_state_shape = (
            self.config.mamba_expand * hidden_size // world_size,
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            self.config.mamba_d_conv - 1,
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        )
        temporal_state_shape = (
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            self.config.mamba_expand * hidden_size // world_size,
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            self.config.mamba_d_state,
        )
        return conv_state_shape, temporal_state_shape

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    def compute_logits(
        self,
        hidden_states: torch.Tensor,
        sampling_metadata: SamplingMetadata,
    ) -> Optional[torch.Tensor]:
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        logits = self.logits_processor(self.lm_head, hidden_states,
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                                       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

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    def load_weights(self, weights: Iterable[Tuple[str,
                                                   torch.Tensor]]) -> Set[str]:
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        stacked_params_mapping = [
            # (param_name, shard_name, shard_id)
            ("qkv_proj", "q_proj", "q"),
            ("qkv_proj", "k_proj", "k"),
            ("qkv_proj", "v_proj", "v"),
        ]

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        # Params for weights, fp8 weight scales, fp8 activation scales
        # (param_name, weight_name, expert_id, shard_id)
        expert_params_mapping = FusedMoE.make_expert_params_mapping(
            ckpt_gate_proj_name="gate_proj",
            ckpt_down_proj_name="down_proj",
            ckpt_up_proj_name="up_proj",
            num_experts=self.config.num_experts)
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        params_dict = dict(self.named_parameters())
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        loaded_params: Set[str] = set()
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        for name, loaded_weight in weights:
            if "rotary_emb.inv_freq" in name:
                continue

            if "A_log" in name:
                name = name.replace("A_log", "A")

            if ".self_attn." in name:
                name = name.replace(".self_attn", "")

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            if "feed_forward" in name and not _is_moe_layer(name):
                ## map MLP layers to expert with ID=0
                name = name.replace("feed_forward", "feed_forward.experts.0")

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            for param_name, weight_name, shard_id in stacked_params_mapping:
                if weight_name not in name:
                    continue
                if 'experts' in name:
                    continue
                name = name.replace(weight_name, param_name)
                # Skip loading extra bias for GPTQ models.
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                if name.endswith(".bias") and name not in params_dict:
                    continue
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                # Skip layers on other devices.
                if is_pp_missing_parameter(name, self):
                    continue
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                param = params_dict[name]
                weight_loader = param.weight_loader
                weight_loader(param, loaded_weight, shard_id)
                break
            else:
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                for (
                        param_name,
                        weight_name,
                        expert_id,
                        shard_id,
                ) in expert_params_mapping:
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                    if weight_name not in name:
                        continue
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                    if is_pp_missing_parameter(name, self):
                        continue
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                    name = name.replace(weight_name, param_name)
                    param = params_dict[name]
                    weight_loader = param.weight_loader
                    weight_loader(param,
                                  loaded_weight,
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                                  name,
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                                  shard_id=shard_id,
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                                  expert_id=expert_id)
                    break
                else:
                    # Skip loading extra bias for GPTQ models.
                    if name.endswith(".bias") and name not in params_dict:
                        continue
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                    if is_pp_missing_parameter(name, self):
                        continue
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                    param = params_dict[name]
                    weight_loader = getattr(param, "weight_loader",
                                            default_weight_loader)
                    weight_loader(param, loaded_weight)
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            loaded_params.add(name)
        return loaded_params
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def _is_moe_layer(name: str):
    return any(
        [experts_name in name for experts_name in [
            "experts",
            "router",
        ]])
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class JambaForSequenceClassification(JambaForCausalLM):

    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
        super().__init__(vllm_config=vllm_config, prefix=prefix)
        config = vllm_config.model_config.hf_config
        num_labels: int = config.num_labels
        score_bias: bool = getattr(config, 'score_bias', False)
        self.score = nn.Linear(config.hidden_size, num_labels, bias=score_bias)

        pooler_config = vllm_config.model_config.pooler_config
        self._pooler = Pooler.from_config_with_defaults(
            pooler_config,
            pooling_type=PoolingType.LAST,
            normalize=False,
            softmax=False)

    def pooler(
        self,
        hidden_states: torch.Tensor,
        pooling_metadata: PoolingMetadata,
    ) -> Optional[PoolerOutput]:
        hidden_states = hidden_states.float()
        logits = self.score(hidden_states)
        return self._pooler(logits, pooling_metadata)

    def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
        # TODO: The reward weights themselves have float32 accuracy data, we
        # would like to load them in fp32 to get that extra precision.
        super().load_weights(weights)
        self.score = self.score.float()