# coding=utf-8
"""Inference-only Jurassic model."""
from dataclasses import dataclass
from typing import Dict, Iterable, List, Optional, Tuple

import torch
from causal_conv1d import causal_conv1d_fn, causal_conv1d_update
from mamba_ssm.ops.selective_scan_interface import selective_scan_fn
from mamba_ssm.ops.triton.selective_state_update import selective_state_update
from torch import nn
from torch.nn.parameter import Parameter
from transformers import JambaConfig

from vllm.attention.backends.abstract import AttentionMetadata
from vllm.attention.layer import Attention
from vllm.config import CacheConfig, LoRAConfig, SchedulerConfig
from vllm.distributed import (get_tensor_model_parallel_rank,
                              get_tensor_model_parallel_world_size,
                              tensor_model_parallel_all_reduce)
from vllm.model_executor.layers.activation import SiluAndMul
from vllm.model_executor.layers.fused_moe import fused_moe
from vllm.model_executor.layers.layernorm import RMSNorm
from vllm.model_executor.layers.linear import (ColumnParallelLinear,
                                               MergedColumnParallelLinear,
                                               QKVParallelLinear,
                                               ReplicatedLinear,
                                               RowParallelLinear)
from vllm.model_executor.layers.logits_processor import LogitsProcessor
from vllm.model_executor.layers.quantization.base_config import (
    QuantizationConfig)
from vllm.model_executor.layers.sampler import 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 default_weight_loader
from vllm.model_executor.models.interfaces import HasInnerState
from vllm.model_executor.sampling_metadata import SamplingMetadata
from vllm.model_executor.utils import set_weight_attrs
from vllm.sequence import IntermediateTensors, SamplerOutput
from vllm.worker.model_runner import (_BATCH_SIZES_TO_CAPTURE,
                                      _get_graph_batch_size)

KVCache = Tuple[torch.Tensor, torch.Tensor]


@dataclass
class MambaCacheParams:
    is_prompt: bool = False
    conv_state: torch.Tensor = torch.Tensor()
    ssm_state: torch.Tensor = torch.Tensor()


# Adapted from transformers.models.mamba.modeling_mamba.MambaMixer
class JambaMambaMixer(nn.Module):
    """
    Compute ∆, A, B, C, and D the state space parameters and compute
    the `contextualized_states`. A, D are input independent
    (see Mamba paper [1] Section 3.5.2 "Interpretation of A"
    for why A isn't selective) ∆, B, C are input-dependent
    (this is a key difference between Mamba and the linear time
    invariant S4, and is why Mamba is called
    **selective** state spaces)
    """

    def __init__(self, config: JambaConfig, layer_idx):
        super().__init__()
        self.config = config
        self.layer_idx = layer_idx
        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_expand * config.hidden_size
        self.time_step_rank = config.mamba_dt_rank
        self.use_conv_bias = config.mamba_conv_bias
        self.use_bias = config.mamba_proj_bias
        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)
        # selective projection used to make dt, B and C input dependent
        self.x_proj = RowParallelLinear(
            self.intermediate_size,
            self.time_step_rank + self.ssm_state_size * 2,
            bias=False,
        )
        # 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.intermediate_size,
                                            bias=True,
                                            skip_bias_add=True)

        def weight_loader(param: Parameter, loaded_weight: torch.Tensor):
            tp_rank = get_tensor_model_parallel_rank()
            tp_size = get_tensor_model_parallel_world_size()
            param.data.copy_(
                loaded_weight.data.split(loaded_weight.shape[0] // tp_size,
                                         dim=0)[tp_rank])

        def A_weight_loader(param: Parameter, loaded_weight: torch.Tensor):
            weight_loader(param, -torch.exp(loaded_weight.float()))

        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": weight_loader})
        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,
        )
        self.activation = config.hidden_act

        self.dt_layernorm = RMSNorm(self.time_step_rank,
                                    eps=config.rms_norm_eps)
        self.b_layernorm = RMSNorm(self.ssm_state_size,
                                   eps=config.rms_norm_eps)
        self.c_layernorm = RMSNorm(self.ssm_state_size,
                                   eps=config.rms_norm_eps)

    def mamba_forward(self,
                      hidden_states: torch.Tensor,
                      cache_params: MambaCacheParams = None):
        # 1. Gated MLP's linear projection
        projected_states = self.in_proj(hidden_states)[0].transpose(1, 2)
        hidden_states, gate = projected_states.chunk(2, dim=1)

        # 2. Convolution sequence transformation
        conv_weights = self.conv1d.weight.view(self.conv1d.weight.size(0),
                                               self.conv1d.weight.size(2))
        if cache_params is not None and not cache_params.is_prompt:
            hidden_states = causal_conv1d_update(
                hidden_states.squeeze(-1),
                cache_params.conv_state,
                conv_weights,
                self.conv1d.bias,
                self.activation,
            )
            hidden_states = hidden_states.unsqueeze(-1)
        else:
            if cache_params is not None:
                conv_states = nn.functional.pad(
                    hidden_states,
                    (self.conv_kernel_size - hidden_states.shape[-1], 0))
                cache_params.conv_state.copy_(conv_states)

            hidden_states = causal_conv1d_fn(
                hidden_states,
                conv_weights,
                self.conv1d.bias,
                activation=self.activation,
            )

        # 3. State Space Model sequence transformation
        # 3.a. input varying initialization of time_step, B and C
        ssm_parameters = self.x_proj(hidden_states.transpose(1, 2))[0]

        time_step, B, C = torch.split(
            ssm_parameters,
            [self.time_step_rank, self.ssm_state_size, self.ssm_state_size],
            dim=-1,
        )
        time_step = self.dt_layernorm(time_step.contiguous())
        B = self.b_layernorm(B.contiguous())
        C = self.c_layernorm(C.contiguous())

        discrete_time_step = self.dt_proj(time_step)[0].transpose(1, 2)
        # 3.c perform the recurrence y ← SSM(A, B, C)(x)
        time_proj_bias = (self.dt_proj.bias.float() if hasattr(
            self.dt_proj, "bias") else None)
        if cache_params is not None and not cache_params.is_prompt:
            scan_outputs = selective_state_update(
                cache_params.ssm_state,
                hidden_states[..., 0],
                discrete_time_step[..., 0],
                self.A,
                B[:, 0],
                C[:, 0],
                self.D,
                gate[..., 0],
                time_proj_bias,
                dt_softplus=True,
            ).unsqueeze(-1)
        else:
            scan_outputs, ssm_state = selective_scan_fn(
                hidden_states,
                discrete_time_step,
                self.A,
                B.transpose(1, 2),
                C.transpose(1, 2),
                self.D.float(),
                gate,
                time_proj_bias,
                delta_softplus=True,
                return_last_state=True,
            )
            if ssm_state is not None and cache_params is not None:
                cache_params.ssm_state.copy_(ssm_state)

        # 4. Final linear projection
        contextualized_states = self.out_proj(scan_outputs.transpose(1, 2))[0]
        return contextualized_states

    def forward(
        self,
        hidden_states: torch.Tensor,
        attn_metadata: AttentionMetadata,
        conv_state: torch.Tensor,
        ssm_state: torch.Tensor,
    ):
        if attn_metadata.prefill_metadata is not None:
            offset = 0
            for i, prompt_len in enumerate(
                    attn_metadata.prefill_metadata.seq_lens):
                cache = MambaCacheParams(True,
                                         conv_state=conv_state[i].unsqueeze(0),
                                         ssm_state=ssm_state[i].unsqueeze(0))
                hidden_states[offset:offset + prompt_len].copy_(
                    self.mamba_forward(hidden_states[offset:offset +
                                                     prompt_len].unsqueeze(0),
                                       cache_params=cache)[0])
                offset += prompt_len
        else:
            cache = MambaCacheParams(False,
                                     conv_state=conv_state,
                                     ssm_state=ssm_state)
            hidden_states = self.mamba_forward(hidden_states.unsqueeze(1),
                                               cache_params=cache)
            hidden_states = hidden_states.squeeze(1)

        return hidden_states


class JambaMLP(nn.Module):

    def __init__(
        self,
        config: JambaConfig,
        quant_config: Optional[QuantizationConfig] = None,
    ) -> None:
        super().__init__()
        hidden_size = config.hidden_size
        intermediate_size = config.intermediate_size
        hidden_act = config.hidden_act
        self.gate_up_proj = MergedColumnParallelLinear(
            hidden_size, [intermediate_size] * 2,
            bias=False,
            quant_config=quant_config)
        self.down_proj = RowParallelLinear(intermediate_size,
                                           hidden_size,
                                           bias=False,
                                           quant_config=quant_config)
        if hidden_act != "silu":
            raise ValueError(f"Unsupported activation: {hidden_act}. "
                             "Only silu is supported for now.")
        self.act_fn = SiluAndMul()

    def forward(self, x):
        gate_up, _ = self.gate_up_proj(x)
        x = self.act_fn(gate_up)
        x, _ = self.down_proj(x)
        return x


class JambaMoE(nn.Module):
    """A tensor-parallel MoE implementation for Mixtral that shards each expert
    across all ranks.

    Each expert's weights are sharded across all ranks and a fused MoE
    kernel is used for the forward pass, and finally we reduce the outputs
    across ranks.
    """

    def __init__(
        self,
        config: JambaConfig,
        params_dtype: Optional[torch.dtype] = None,
        tp_size: Optional[int] = None,
        quant_config: Optional[QuantizationConfig] = None,
    ):
        super().__init__()
        self.tp_size = tp_size or get_tensor_model_parallel_world_size()
        self.num_total_experts = config.num_experts
        self.top_k = config.num_experts_per_tok
        self.hidden_size = config.hidden_size
        self.intermediate_size = config.intermediate_size // self.tp_size

        if params_dtype is None:
            params_dtype = torch.get_default_dtype()
        self.params_dtype = params_dtype

        self.router = ReplicatedLinear(self.hidden_size,
                                       self.num_total_experts,
                                       bias=False,
                                       params_dtype=self.params_dtype)

        self.ws = nn.Parameter(
            torch.empty(
                self.num_total_experts,
                2 * self.intermediate_size,
                self.hidden_size,
                device="cuda",
                dtype=self.params_dtype,
            ))
        self.w2s = nn.Parameter(
            torch.empty(
                self.num_total_experts,
                self.hidden_size,
                self.intermediate_size,
                device="cuda",
                dtype=self.params_dtype,
            ))

        set_weight_attrs(
            self.ws,
            {
                "weight_loader": self.weight_loader,
            },
        )
        set_weight_attrs(
            self.w2s,
            {
                "weight_loader": self.weight_loader,
            },
        )

    def weight_loader(
        self,
        param: nn.Parameter,
        loaded_weight: torch.Tensor,
        weight_name: str,
        expert_id: int,
    ):
        tp_rank = get_tensor_model_parallel_rank()
        param_data = param.data
        shard_size = self.intermediate_size
        shard = slice(tp_rank * shard_size, (tp_rank + 1) * shard_size)
        if weight_name.endswith("gate_proj.weight"):
            param_data[expert_id, 0:shard_size, :] = loaded_weight[shard, :]
        if weight_name.endswith("up_proj.weight"):
            param_data[expert_id,
                       shard_size:2 * shard_size, :] = loaded_weight[shard, :]
        if weight_name.endswith("down_proj.weight"):
            param_data[expert_id, :, :] = loaded_weight[:, shard]

    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
        num_tokens, hidden_size = hidden_states.shape
        hidden_states = hidden_states.view(-1, self.hidden_size)
        # router_logits: (batch * sequence_length, n_experts)
        router_logits, _ = self.router(hidden_states)

        final_hidden_states = fused_moe(
            hidden_states,
            self.ws,
            self.w2s,
            router_logits,
            self.top_k,
            renormalize=
            False,  # Mixtral normalize the expert probs to 1. We don't!
            inplace=True,
        )

        if self.tp_size > 1:
            final_hidden_states = tensor_model_parallel_all_reduce(
                final_hidden_states)

        return final_hidden_states.view(num_tokens, hidden_size)


class JambaMambaDecoderLayer(nn.Module):

    def __init__(self,
                 config: JambaConfig,
                 layer_idx: int,
                 cache_config: Optional[CacheConfig] = None,
                 quant_config: Optional[QuantizationConfig] = None) -> None:
        super().__init__()
        self.layer_idx = layer_idx
        self.config = config
        self.mamba = JambaMambaMixer(config, layer_idx)

        num_experts = config.layers_num_experts[layer_idx]
        ffn_layer_class = JambaMoE if num_experts > 1 else JambaMLP
        self.feed_forward = ffn_layer_class(config, quant_config=quant_config)
        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,
        attn_metadata: AttentionMetadata,
        residual: Optional[torch.Tensor],
        conv_state: torch.Tensor,
        ssm_state: 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.mamba(hidden_states, attn_metadata, conv_state,
                                   ssm_state)
        # 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):

    def __init__(
        self,
        config: JambaConfig,
        layer_idx: int,
        cache_config: Optional[CacheConfig] = None,
        quant_config: Optional[QuantizationConfig] = None,
    ) -> 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 // 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,
        )

        num_experts = config.layers_num_experts[layer_idx]
        ffn_layer_class = JambaMoE if num_experts > 1 else JambaMLP
        self.feed_forward = ffn_layer_class(config, quant_config=quant_config)
        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,
        kv_cache: torch.Tensor,
        attn_metadata: AttentionMetadata,
        **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)
        attn_output = self.attn(q, k, v, kv_cache, attn_metadata)
        output, _ = self.o_proj(attn_output)
        return output

    def forward(
        self,
        positions: torch.Tensor,
        hidden_states: torch.Tensor,
        kv_cache: torch.Tensor,
        attn_metadata: AttentionMetadata,
        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,
            kv_cache=kv_cache,
            attn_metadata=attn_metadata,
        )
        # 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):

    def __init__(
        self,
        config: JambaConfig,
        quant_config: Optional[QuantizationConfig] = None,
        cache_config: Optional[CacheConfig] = None,
        lora_config: Optional[LoRAConfig] = None,
    ) -> None:
        super().__init__()
        self.config = config
        self.padding_idx = config.pad_token_id
        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,
        )

        decoder_layers = []
        for i in range(config.num_hidden_layers):
            layer_class = ALL_DECODER_LAYER_TYPES[config.layers_block_type[i]]
            decoder_layers.append(
                layer_class(config,
                            layer_idx=i,
                            cache_config=cache_config,
                            quant_config=quant_config))
        self.layers = nn.ModuleList(decoder_layers)
        self.final_layernorm = RMSNorm(config.hidden_size,
                                       eps=config.rms_norm_eps)

    def forward(
        self,
        input_ids: torch.Tensor,
        positions: torch.Tensor,
        kv_caches: List[torch.Tensor],
        attn_metadata: AttentionMetadata,
        conv_state: torch.Tensor,
        ssm_state: torch.Tensor,
    ) -> torch.Tensor:
        hidden_states = self.embed_tokens(input_ids)
        residual = None

        for i in range(len(self.layers)):
            layer = self.layers[i]
            kv_cache = None
            current_ssm_state = None
            current_conv_state = None
            if isinstance(layer, JambaAttentionDecoderLayer):
                kv_cache = kv_caches[(i - self.config.attn_layer_offset) //
                                     self.config.attn_layer_period]
            if isinstance(layer, JambaMambaDecoderLayer):
                current_state_layer = i - (1 +
                                           (i - self.config.attn_layer_offset)
                                           // self.config.attn_layer_period)
                current_ssm_state = ssm_state[current_state_layer]
                current_conv_state = conv_state[current_state_layer]

            hidden_states, residual = layer(
                positions=positions,
                hidden_states=hidden_states,
                kv_cache=kv_cache,
                attn_metadata=attn_metadata,
                residual=residual,
                conv_state=current_conv_state,
                ssm_state=current_ssm_state,
            )
        hidden_states, _ = self.final_layernorm(hidden_states, residual)
        return hidden_states


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

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

    def __init__(
        self,
        config: JambaConfig,
        cache_config: Optional[CacheConfig] = None,
        quant_config: Optional[QuantizationConfig] = None,
        lora_config: Optional[LoRAConfig] = None,
        scheduler_config: Optional[SchedulerConfig] = None,
    ) -> None:
        assert not scheduler_config.chunked_prefill_enabled, \
            "Jamba currently does not support chunked prefill"
        assert not cache_config.enable_prefix_caching, \
            "Jamba currently does not support prefix caching"

        super().__init__()
        self.config = config
        self.scheduler_config = scheduler_config
        self.model = JambaModel(config,
                                cache_config=cache_config,
                                quant_config=quant_config,
                                lora_config=lora_config)
        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,
        )
        # Current step used indices
        self.current_indices: List[int] = []
        # Used to track and store by the Mamba cache between steps.
        self.mamba_cache: Tuple[torch.Tensor, torch.Tensor] = tuple()
        # Used as an input_buffer for the CUDA graph runs.
        self.mamba_gc_cache_buffer: Tuple[torch.Tensor, torch.Tensor] = tuple()
        # Maps between the request id and a dict that maps between the seq_id
        # and its index inside the self.mamba_cache
        self.mamba_cache_indices_mapping: Dict[str, Dict[int, int]] = {}
        self.logits_processor = LogitsProcessor(self.unpadded_vocab_size,
                                                config.vocab_size)
        self.sampler = Sampler()

    def forward(self,
                input_ids: torch.Tensor,
                positions: torch.Tensor,
                kv_caches: List[KVCache],
                attn_metadata: AttentionMetadata,
                intermediate_tensors: Optional[IntermediateTensors] = None,
                **kwargs):
        if not self.mamba_cache:
            self._prepare_mamba_cache()

        if "seqlen_agnostic_capture_inputs" not in kwargs:
            # We get here only on Prefill/Eager mode runs
            assert all(
                key in kwargs
                for key in ["request_ids_to_seq_ids", "finished_requests_ids"])

            request_ids_to_seq_ids = kwargs["request_ids_to_seq_ids"]
            finished_requests_ids = kwargs["finished_requests_ids"]
            self._release_mamba_cache(finished_requests_ids)
            batch_size = input_ids.shape[0]
            if attn_metadata.prefill_metadata:
                batch_size = len(request_ids_to_seq_ids)
            (
                current_seqlen_agnostic_cache,
                indices,
            ) = self._prepare_current_run_mamba_cache(request_ids_to_seq_ids,
                                                      batch_size,
                                                      finished_requests_ids)
        else:
            # CUDA graph capturing runs
            current_seqlen_agnostic_cache, indices = (
                kwargs["seqlen_agnostic_capture_inputs"],
                [],
            )
        self.current_indices = indices

        hidden_states = self.model(input_ids, positions, kv_caches,
                                   attn_metadata,
                                   current_seqlen_agnostic_cache[0],
                                   current_seqlen_agnostic_cache[1])

        if "seqlen_agnostic_capture_inputs" not in kwargs:
            self._copy_mamba_cache_by_indices(self.current_indices,
                                              current_seqlen_agnostic_cache)

        return hidden_states

    def _copy_mamba_cache_by_indices(
            self, indices: List[int],
            current_seqlen_agnostic_cache: Tuple[torch.Tensor, torch.Tensor]):
        for i, offset in enumerate(indices):
            self._copy_mamba_cache(offset, i, current_seqlen_agnostic_cache)

    def _copy_mamba_cache(self, index_to: int, index_from: int,
                          from_buffer: Tuple[torch.Tensor, torch.Tensor]):
        assert len(self.mamba_cache) > 0
        for (cache_t, from_buffer_t) in zip(self.mamba_cache, from_buffer):
            cache_t[:, index_to].copy_(from_buffer_t[:, index_from],
                                       non_blocking=True)

    def _assign_seq_id_to_mamba_cache(self, cur_rid: str,
                                      seqs_id: List[int]) -> List[int]:
        indices_for_current_run = []
        for seq_id in seqs_id:
            if cur_rid not in self.mamba_cache_indices_mapping:
                self.mamba_cache_indices_mapping[cur_rid] = {}
                first_free_index = self._first_free_index_in_mamba_cache()
                self.mamba_cache_indices_mapping[cur_rid][
                    seq_id] = first_free_index
                index_for_current_run = first_free_index
            ## case of decoding n>1, copy prefill cache to decoding indices
            elif seq_id not in (seq_ids2indices :=
                                self.mamba_cache_indices_mapping[cur_rid]):
                first_free_index = self._first_free_index_in_mamba_cache()
                index_exist = list(seq_ids2indices.values())[0]
                self._copy_mamba_cache(index_from=index_exist,
                                       index_to=first_free_index,
                                       from_buffer=self.mamba_cache)
                self.mamba_cache_indices_mapping[cur_rid][
                    seq_id] = first_free_index
                index_for_current_run = first_free_index
            else:
                index_for_current_run = self.mamba_cache_indices_mapping[
                    cur_rid][seq_id]

            indices_for_current_run.append(index_for_current_run)
        return indices_for_current_run

    def _prepare_current_run_mamba_cache(
        self, request_ids_to_seq_ids: Dict[str, list[int]], batch_size: int,
        finished_requests_ids: List[str]
    ) -> Tuple[Tuple[torch.Tensor, torch.Tensor], List[int]]:
        indices_for_current_run = []
        for request_id, seqs_id in request_ids_to_seq_ids.items():
            if request_id in finished_requests_ids:
                # Do not allocate cache for requests that run
                # and finish right after
                continue
            indices_for_current_run += self._assign_seq_id_to_mamba_cache(
                request_id, seqs_id)
        ## Pad the batch in case of running batch that was not captured via CG
        padded_indices = indices_for_current_run.copy()
        pad_index = self._first_free_index_in_mamba_cache()

        for _ in range(batch_size - len(indices_for_current_run)):
            padded_indices.append(pad_index)

        conv_state = self.mamba_cache[0][:, padded_indices]
        temporal_state = self.mamba_cache[1][:, padded_indices]

        return (conv_state, temporal_state), indices_for_current_run

    def copy_inputs_before_cuda_graphs(self, input_buffers, **kwargs):
        """
        Copy the relevant Mamba cache into the CUDA graph input buffer 
        that was provided during the capture runs 
        (JambaForCausalLM.mamba_gc_cache_buffer). 
        """
        assert all(
            key in kwargs
            for key in ["request_ids_to_seq_ids", "finished_requests_ids"])
        finished_requests_ids = kwargs["finished_requests_ids"]
        self._release_mamba_cache(finished_requests_ids)
        request_ids_to_seq_ids = kwargs["request_ids_to_seq_ids"]
        cg_batch_size = input_buffers['input_ids'].shape[0]
        (
            current_mamba_cache,
            indices,
        ) = self._prepare_current_run_mamba_cache(request_ids_to_seq_ids,
                                                  cg_batch_size,
                                                  finished_requests_ids)
        self.current_indices = indices

        for input_buffer, current_cache_buffer in zip(
                input_buffers["seqlen_agnostic_capture_inputs"],
                current_mamba_cache):
            input_buffer.copy_(current_cache_buffer, non_blocking=True)

    def copy_outputs_after_cuda_graphs(self, input_buffers, **kwargs):
        """
        Copy the relevant Mamba cache from the CUDA graph input_buffers
        back to the JambaForCausalLM.mamba_cache after CUDA 
        graph replay run is done.
        """
        self._copy_mamba_cache_by_indices(
            self.current_indices,
            input_buffers["seqlen_agnostic_capture_inputs"])

    def get_seqlen_agnostic_capture_inputs(self, batch_size: int):
        """
        Provide the CUDA graph capture runs with a buffer in adjusted size.
        The buffer is used to maintain the Mamba Cache during the CUDA graph 
        replay runs.
        """
        return tuple(buffer[:, :batch_size]
                     for buffer in self.mamba_gc_cache_buffer)

    def _release_mamba_cache(self, finished_seq_groups_req_ids: List[str]):
        for req_id in finished_seq_groups_req_ids:
            if req_id in self.mamba_cache_indices_mapping:
                self.mamba_cache_indices_mapping.pop(req_id)

    def _first_free_index_in_mamba_cache(self) -> int:
        if self.mamba_cache:
            max_possible_batch_size = self.mamba_cache[0].shape[1]
            occupied = [
                id for seq_ids in self.mamba_cache_indices_mapping.values()
                for id in seq_ids.values()
            ]
            first_free_index = [
                i not in occupied for i in range(max_possible_batch_size)
            ].index(True)
            return first_free_index
        return 0

    def _get_mamba_cache_shape(
            self
    ) -> Tuple[Optional[Tuple[int, int]], Optional[Tuple[int, int]]]:
        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,
            self.config.mamba_d_conv,
        )
        temporal_state_shape = (
            self.config.mamba_expand * self.config.hidden_size // world_size,
            self.config.mamba_d_state,
        )
        return conv_state_shape, temporal_state_shape

    def _prepare_mamba_cache(self):
        dtype = self.lm_head.weight.dtype
        layers_type = self.config.layers_block_type
        mamba_layers = sum(
            [layer_type == "mamba" for layer_type in layers_type])
        max_batch_size = (_get_graph_batch_size(
            self.scheduler_config.max_num_seqs) if self.scheduler_config else
                          max(_BATCH_SIZES_TO_CAPTURE)) + 10
        conv_state_shape, temporal_state_shape = self._get_mamba_cache_shape()
        assert conv_state_shape is not None and temporal_state_shape is not None

        for buffername in ["mamba_cache", "mamba_gc_cache_buffer"]:
            buffer = (torch.empty(size=(mamba_layers, max_batch_size) +
                                  conv_state_shape,
                                  dtype=dtype,
                                  device="cuda"),
                      torch.empty(size=(mamba_layers, max_batch_size) +
                                  temporal_state_shape,
                                  dtype=dtype,
                                  device="cuda"))
            setattr(self, buffername, buffer)

    def compute_logits(self, hidden_states: torch.Tensor,
                       sampling_metadata: SamplingMetadata) -> 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]]):
        stacked_params_mapping = [
            # (param_name, shard_name, shard_id)
            ("qkv_proj", "q_proj", "q"),
            ("qkv_proj", "k_proj", "k"),
            ("qkv_proj", "v_proj", "v"),
            ("gate_up_proj", "gate_proj", 0),
            ("gate_up_proj", "up_proj", 1),
        ]

        expert_params_mapping = [
            # (param_name, weight_name, expert_id)
            (
                "ws" if weight_name in ["gate_proj", "up_proj"] else "w2s",
                f"experts.{expert_id}.{weight_name}.weight",
                expert_id,
            ) for expert_id in range(self.config.num_experts)
            for weight_name in ["down_proj", "up_proj", "gate_proj"]
        ]

        params_dict = dict(self.named_parameters())
        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", "")

            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.
                if name.endswith(".bias") and name not in params_dict:
                    continue
                param = params_dict[name]
                weight_loader = param.weight_loader
                weight_loader(param, loaded_weight, shard_id)
                break
            else:
                for param_name, weight_name, expert_id in expert_params_mapping:
                    if weight_name not in name:
                        continue
                    name = name.replace(weight_name, param_name)
                    param = params_dict[name]
                    weight_loader = param.weight_loader
                    weight_loader(param,
                                  loaded_weight,
                                  weight_name,
                                  expert_id=expert_id)
                    break
                else:
                    # Skip loading extra bias for GPTQ models.
                    if name.endswith(".bias") and name not in params_dict:
                        continue

                    param = params_dict[name]
                    weight_loader = getattr(param, "weight_loader",
                                            default_weight_loader)
                    weight_loader(param, loaded_weight)
