# coding=utf-8
# Copyright 2024 the HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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"""PyTorch Mllama model."""

import math
from typing import Callable, Optional, Union

import torch
import torch.nn.functional as F
from torch import nn

from ...activations import ACT2FN
from ...cache_utils import Cache, DynamicCache
from ...generation import GenerationMixin
from ...modeling_attn_mask_utils import AttentionMaskConverter
from ...modeling_flash_attention_utils import FlashAttentionKwargs
from ...modeling_layers import GradientCheckpointingLayer
from ...modeling_outputs import BaseModelOutput, BaseModelOutputWithPast, CausalLMOutputWithPast
from ...modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
from ...modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
from ...processing_utils import Unpack
from ...utils import TransformersKwargs, auto_docstring, can_return_tuple, is_torch_flex_attn_available, logging
from ...utils.deprecation import deprecate_kwarg
from ...utils.generic import OutputRecorder, check_model_inputs
from .configuration_mllama import MllamaConfig, MllamaTextConfig, MllamaVisionConfig


if is_torch_flex_attn_available():
    from torch.nn.attention.flex_attention import BlockMask

    from ...integrations.flex_attention import make_flex_block_causal_mask

logger = logging.get_logger(__name__)


def _prepare_cross_attention_mask(
    cross_attention_mask: torch.Tensor,
    num_vision_tokens: int,
    dtype: str,
) -> tuple[torch.Tensor, torch.Tensor]:
    # reshape so it can be used by attn module
    batch_size, text_total_length, *_ = cross_attention_mask.shape
    cross_attention_mask = cross_attention_mask.repeat_interleave(num_vision_tokens, dim=3)
    cross_attention_mask = cross_attention_mask.view(batch_size, text_total_length, -1)
    cross_attention_mask = cross_attention_mask.unsqueeze(1)

    # invert the mask
    inverted_cross_attn_mask = (1.0 - cross_attention_mask).to(dtype)
    cross_attention_mask = inverted_cross_attn_mask.masked_fill(
        inverted_cross_attn_mask.to(torch.bool), torch.finfo(dtype).min
    )

    # apply full-row bias, which return 4D tensor of shape [B, H, S1, 1] where value is 0 if the a full row in cross attn mask's
    # last dimension contains negative infinity values, otherwise it's 1
    negative_inf_value = torch.finfo(dtype).min
    full_text_row_masked_out_mask = (
        (cross_attention_mask != negative_inf_value).any(dim=-1).type_as(cross_attention_mask)[..., None]
    )
    cross_attention_mask *= full_text_row_masked_out_mask

    return cross_attention_mask, full_text_row_masked_out_mask


def _prepare_aspect_ratio_attention_mask(
    aspect_ratio_mask: torch.Tensor,
    num_patches: int,
    target_length: int,
    dtype: torch.dtype,
) -> torch.Tensor:
    # Expand aspect ratio mask to target_length
    batch_size, max_num_tiles = aspect_ratio_mask.shape
    attention_mask = aspect_ratio_mask.view(batch_size, max_num_tiles, 1, 1).to(dtype)
    attention_mask = attention_mask.repeat(1, 1, target_length, 1)

    # Mask padding patches
    pad_patches = target_length - num_patches
    attention_mask[:, :, -pad_patches:] = 0

    # Invert the mask (0 -> 1, 1 -> 0)
    attention_mask = 1 - attention_mask

    # Reshape to 2D and create 4D attention mask
    # (batch_size, 1, max_num_tiles * target_length, max_num_tiles * target_length)
    attention_mask = attention_mask.reshape(batch_size, max_num_tiles * target_length, 1)
    attention_mask = attention_mask @ attention_mask.transpose(-1, -2) * torch.finfo(dtype).min
    attention_mask = attention_mask.unsqueeze(1)

    return attention_mask


class MllamaPrecomputedAspectRatioEmbedding(nn.Module):
    def __init__(self, config: MllamaVisionConfig, is_gated: bool = True):
        super().__init__()
        self.max_num_tiles = config.max_num_tiles
        self.hidden_size = config.hidden_size
        self.max_aspect_ratio_id = config.max_aspect_ratio_id
        self.is_gated = is_gated

        self.embedding = nn.Embedding(self.max_aspect_ratio_id + 1, self.max_num_tiles * self.hidden_size)
        if is_gated:
            self.gate = nn.Parameter(torch.zeros(1))

    def forward(self, hidden_state: torch.Tensor, aspect_ratio_ids: torch.Tensor) -> torch.Tensor:
        embeddings = self.embedding(aspect_ratio_ids)
        embeddings = embeddings.reshape(-1, self.max_num_tiles, 1, self.hidden_size)

        if self.is_gated:
            embeddings = embeddings * self.gate.tanh()

        hidden_state = hidden_state + embeddings
        return hidden_state


class MllamaPrecomputedPositionEmbedding(nn.Module):
    def __init__(self, config: MllamaVisionConfig):
        super().__init__()
        self.max_num_tiles = config.max_num_tiles
        self.max_aspect_ratio_id = config.max_aspect_ratio_id
        self.num_patches = (config.image_size // config.patch_size) ** 2 + 1
        self.hidden_size = config.hidden_size
        self.scale = config.hidden_size**-0.5

        self.gate = nn.Parameter(torch.zeros(1))

        # position embedding
        position_embedding = torch.randn(self.num_patches, self.hidden_size)
        self.embedding = nn.Parameter(self.scale * position_embedding)

        # tile position embedding
        self.tile_embedding = nn.Embedding(
            self.max_aspect_ratio_id + 1, self.max_num_tiles * self.num_patches * self.hidden_size
        )

    def forward(self, hidden_state: torch.Tensor, aspect_ratio_ids: torch.Tensor) -> torch.Tensor:
        # position embeddings
        gated_position_embedding = (1 - self.gate.tanh()) * self.embedding
        hidden_state = hidden_state + gated_position_embedding.view(1, 1, self.num_patches, self.hidden_size)

        # precomputed tile position embeddings
        tile_position_embedding = self.tile_embedding(aspect_ratio_ids)
        batch_size = hidden_state.shape[0]
        tile_position_embedding = tile_position_embedding.reshape(
            batch_size, self.max_num_tiles, self.num_patches, self.hidden_size
        )
        gated_tile_position_embedding = self.gate.tanh() * tile_position_embedding
        hidden_state = hidden_state + gated_tile_position_embedding

        return hidden_state


# Copied from transformers.models.clip.modeling_clip.CLIPMLP with CLIP->MllamaVision
class MllamaVisionMLP(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.activation_fn = ACT2FN[config.hidden_act]
        self.fc1 = nn.Linear(config.hidden_size, config.intermediate_size)
        self.fc2 = nn.Linear(config.intermediate_size, config.hidden_size)

    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
        hidden_states = self.fc1(hidden_states)
        hidden_states = self.activation_fn(hidden_states)
        hidden_states = self.fc2(hidden_states)
        return hidden_states


# Copied from transformers.models.llama.modeling_llama.repeat_kv
def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
    """
    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
    """
    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
    if n_rep == 1:
        return hidden_states
    hidden_states = hidden_states[:, :, None, :, :].expand(batch, num_key_value_heads, n_rep, slen, head_dim)
    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)


# Copied from transformers.models.llama.modeling_llama.eager_attention_forward
def eager_attention_forward(
    module: nn.Module,
    query: torch.Tensor,
    key: torch.Tensor,
    value: torch.Tensor,
    attention_mask: Optional[torch.Tensor],
    scaling: float,
    dropout: float = 0.0,
    **kwargs: Unpack[TransformersKwargs],
):
    key_states = repeat_kv(key, module.num_key_value_groups)
    value_states = repeat_kv(value, module.num_key_value_groups)

    attn_weights = torch.matmul(query, key_states.transpose(2, 3)) * scaling
    if attention_mask is not None:
        causal_mask = attention_mask[:, :, :, : key_states.shape[-2]]
        attn_weights = attn_weights + causal_mask

    attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to(query.dtype)
    attn_weights = nn.functional.dropout(attn_weights, p=dropout, training=module.training)
    attn_output = torch.matmul(attn_weights, value_states)
    attn_output = attn_output.transpose(1, 2).contiguous()

    return attn_output, attn_weights


class MllamaVisionAttention(nn.Module):
    def __init__(self, config: MllamaVisionConfig):
        super().__init__()

        self.config = config
        self.embed_dim = config.hidden_size
        self.num_heads = config.attention_heads
        self.head_dim = config.hidden_size // config.attention_heads
        self.scaling = self.head_dim**-0.5
        self.num_key_value_groups = 1

        self.q_proj = nn.Linear(self.embed_dim, self.num_heads * self.head_dim, bias=False)
        self.k_proj = nn.Linear(self.embed_dim, self.num_heads * self.head_dim, bias=False)
        self.v_proj = nn.Linear(self.embed_dim, self.num_heads * self.head_dim, bias=False)
        self.o_proj = nn.Linear(self.num_heads * self.head_dim, self.embed_dim, bias=False)

    def forward(
        self,
        hidden_state: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
        **kwargs,
    ) -> tuple[torch.Tensor, Optional[torch.Tensor]]:
        query = self.q_proj(hidden_state)
        key = self.k_proj(hidden_state)
        value = self.v_proj(hidden_state)

        batch_size, q_seq_len, _ = query.shape
        _, kv_seq_len, _ = key.shape

        query = query.view(batch_size, q_seq_len, self.num_heads, self.head_dim).transpose(1, 2)
        key = key.view(batch_size, kv_seq_len, self.num_heads, self.head_dim).transpose(1, 2)
        value = value.view(batch_size, kv_seq_len, self.num_heads, self.head_dim).transpose(1, 2)

        attention_interface: Callable = eager_attention_forward

        if self.config._attn_implementation != "eager":
            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]

        attn_output, attn_weights = attention_interface(
            self,
            query,
            key,
            value,
            attention_mask,
            dropout=0.0,
            scaling=self.scaling,
            **kwargs,
        )

        attn_output = attn_output.reshape(batch_size, q_seq_len, -1).contiguous()
        attn_output = self.o_proj(attn_output)

        return attn_output, attn_weights


class MllamaVisionEncoderLayer(nn.Module):
    def __init__(self, config: MllamaVisionConfig, is_gated: bool = False):
        super().__init__()

        self.hidden_size = config.hidden_size
        self.num_attention_heads = config.attention_heads
        self.is_gated = is_gated
        self.intermediate_size = config.intermediate_size

        self.self_attn = MllamaVisionAttention(config)
        self.mlp = MllamaVisionMLP(config)

        self.input_layernorm = nn.LayerNorm(self.hidden_size, eps=config.norm_eps)
        self.post_attention_layernorm = nn.LayerNorm(self.hidden_size, eps=config.norm_eps)

        if is_gated:
            self.gate_attn = nn.Parameter(torch.ones(1) * math.pi / 4)
            self.gate_ffn = nn.Parameter(torch.ones(1) * math.pi / 4)

    def forward(
        self,
        hidden_state: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
    ):
        # Self Attention
        residual = hidden_state
        hidden_state = self.input_layernorm(hidden_state)
        hidden_state, attn_weights = self.self_attn(hidden_state, attention_mask=attention_mask)
        if self.is_gated:
            hidden_state = self.gate_attn.tanh() * hidden_state
        hidden_state = residual + hidden_state

        # Feed forward
        residual = hidden_state
        hidden_state = self.post_attention_layernorm(hidden_state)
        hidden_state = self.mlp(hidden_state)
        if self.is_gated:
            hidden_state = self.gate_ffn.tanh() * hidden_state
        hidden_state = residual + hidden_state

        return hidden_state


class MllamaVisionEncoder(nn.Module):
    """
    Transformer encoder consisting of `config.num_hidden_layers` self attention layers. Each layer is a
    [`MllamaEncoderLayer`].

    Args:
        config: MllamaConfig
    """

    def __init__(self, config: MllamaVisionConfig, num_layers=32, is_gated=False):
        super().__init__()
        self.config = config
        self.layers = nn.ModuleList([MllamaVisionEncoderLayer(config, is_gated) for _ in range(num_layers)])
        self.gradient_checkpointing = False
        self.config = config

    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
    ) -> BaseModelOutput:
        r"""
        Args:
            inputs_embeds (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`):
                Optionally, instead of passing `input_ids` you can choose to directly pass an embedded representation.
                This is useful if you want more control over how to convert `input_ids` indices into associated vectors
                than the model's internal embedding lookup matrix.
            attention_mask (`torch.Tensor` of shape `(batch_size, sequence_length)`, *optional*):
                Mask to avoid performing attention on padding token indices. Mask values selected in `[0, 1]`:

                - 1 for tokens that are **not masked**,
                - 0 for tokens that are **masked**.

                [What are attention masks?](../glossary#attention-mask)

        """
        encoder_states = ()
        for encoder_layer in self.layers:
            hidden_states = encoder_layer(
                hidden_state=hidden_states,
                attention_mask=attention_mask,
            )
            encoder_states = encoder_states + (hidden_states,)

        return BaseModelOutput(last_hidden_state=hidden_states, hidden_states=encoder_states)


# Copied from transformers.models.llama.modeling_llama.LlamaRMSNorm with Llama->MllamaText
class MllamaTextRMSNorm(nn.Module):
    def __init__(self, hidden_size, eps=1e-6):
        """
        MllamaTextRMSNorm is equivalent to T5LayerNorm
        """
        super().__init__()
        self.weight = nn.Parameter(torch.ones(hidden_size))
        self.variance_epsilon = eps

    def forward(self, hidden_states):
        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 + self.variance_epsilon)
        return self.weight * hidden_states.to(input_dtype)

    def extra_repr(self):
        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"


class MllamaTextCrossAttention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(
        self,
        config: Optional[MllamaTextConfig] = None,
        layer_idx: Optional[int] = None,
    ):
        super().__init__()
        self.config = config
        self.num_heads = self.config.num_attention_heads
        self.num_key_value_heads = self.config.num_key_value_heads
        self.dropout = config.dropout
        self.hidden_size = config.hidden_size
        self.head_dim = config.hidden_size // self.num_heads
        self.layer_idx = layer_idx
        self.num_key_value_groups = self.num_heads // self.num_key_value_heads
        self.scaling = self.head_dim**-0.5

        self.q_proj = nn.Linear(self.hidden_size, self.num_heads * self.head_dim, bias=False)
        self.k_proj = nn.Linear(self.hidden_size, self.num_key_value_heads * self.head_dim, bias=False)
        self.v_proj = nn.Linear(self.hidden_size, self.num_key_value_heads * self.head_dim, bias=False)
        self.o_proj = nn.Linear(self.num_heads * self.head_dim, self.hidden_size, bias=False)

        self.q_norm = MllamaTextRMSNorm(self.head_dim, eps=config.rms_norm_eps)
        self.k_norm = MllamaTextRMSNorm(self.head_dim, eps=config.rms_norm_eps)

    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
    def forward(
        self,
        hidden_states: torch.Tensor,
        cross_attention_states: Optional[torch.Tensor] = None,
        past_key_values: Optional[Cache] = None,
        attention_mask: Optional[torch.Tensor] = None,
        use_cache: Optional[bool] = None,
        cache_position: Optional[torch.LongTensor] = None,
        **kwargs,
    ) -> tuple[torch.Tensor, Optional[torch.Tensor], Optional[tuple[torch.Tensor]]]:
        """Input shape: Batch x Time x Channel"""
        bsz, q_len, _ = hidden_states.size()
        query_states = self.q_proj(hidden_states)
        query_states = query_states.view(bsz, q_len, self.num_heads, self.head_dim).transpose(1, 2)
        query_states = self.q_norm(query_states)

        if cross_attention_states is not None:
            key_states = self.k_proj(cross_attention_states)
            value_states = self.v_proj(cross_attention_states)
            key_states = key_states.view(bsz, -1, self.num_key_value_heads, self.head_dim).transpose(1, 2)
            value_states = value_states.view(bsz, -1, self.num_key_value_heads, self.head_dim).transpose(1, 2)

            key_states = self.k_norm(key_states)
            if past_key_values is not None:
                # if we have a new image + new tokens, we only computed key_states on that new image
                # we still update the cross key states, past_image, new_image. And use it!
                key_states, value_states = past_key_values.update(
                    key_states, value_states, self.layer_idx, {"cache_position": cache_position}
                )
        elif cache_position[0] != 0:
            key_states, value_states = (
                past_key_values.layers[self.layer_idx].keys,
                past_key_values.layers[self.layer_idx].values,
            )
        else:
            raise ValueError(
                "Cross attention layer can't find neither `cross_attn_states` nor cached values for key/values!"
            )

        attention_interface: Callable = eager_attention_forward

        if self.config._attn_implementation != "eager":
            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]

        attn_output, attn_weights = attention_interface(
            self,
            query_states,
            key_states,
            value_states,
            attention_mask,
            dropout=0.0 if not self.training else self.dropout,
            scaling=self.scaling,
            **kwargs,
        )

        attn_output = attn_output.reshape(bsz, q_len, -1).contiguous()
        attn_output = self.o_proj(attn_output)

        return attn_output, attn_weights


# Copied from transformers.models.llama.modeling_llama.rotate_half
def rotate_half(x):
    """Rotates half the hidden dims of the input."""
    x1 = x[..., : x.shape[-1] // 2]
    x2 = x[..., x.shape[-1] // 2 :]
    return torch.cat((-x2, x1), dim=-1)


# Copied from transformers.models.llama.modeling_llama.apply_rotary_pos_emb
def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
    """Applies Rotary Position Embedding to the query and key tensors.

    Args:
        q (`torch.Tensor`): The query tensor.
        k (`torch.Tensor`): The key tensor.
        cos (`torch.Tensor`): The cosine part of the rotary embedding.
        sin (`torch.Tensor`): The sine part of the rotary embedding.
        position_ids (`torch.Tensor`, *optional*):
            Deprecated and unused.
        unsqueeze_dim (`int`, *optional*, defaults to 1):
            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
    Returns:
        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
    """
    cos = cos.unsqueeze(unsqueeze_dim)
    sin = sin.unsqueeze(unsqueeze_dim)
    q_embed = (q * cos) + (rotate_half(q) * sin)
    k_embed = (k * cos) + (rotate_half(k) * sin)
    return q_embed, k_embed


class MllamaTextSelfAttention(nn.Module):
    def __init__(self, config: MllamaTextConfig, layer_idx: int):
        super().__init__()
        self.config = config
        self.num_heads = config.num_attention_heads
        self.dropout = config.dropout
        self.hidden_size = config.hidden_size
        self.num_key_value_heads = config.num_key_value_heads
        self.head_dim = config.hidden_size // self.num_heads
        self.num_key_value_groups = self.num_heads // self.num_key_value_heads
        self.scaling = self.head_dim**-0.5
        self.rope_theta = config.rope_theta
        self.layer_idx = layer_idx

        self.q_proj = nn.Linear(self.hidden_size, self.num_heads * self.head_dim, bias=False)
        self.k_proj = nn.Linear(self.hidden_size, self.num_key_value_heads * self.head_dim, bias=False)
        self.v_proj = nn.Linear(self.hidden_size, self.num_key_value_heads * self.head_dim, bias=False)
        self.o_proj = nn.Linear(self.num_heads * self.head_dim, self.hidden_size, bias=False)

    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: torch.Tensor,
        position_embeddings: torch.Tensor,
        use_cache: bool = False,
        past_key_values=None,
        cache_position=None,
        **kwargs,
    ):
        bsz, q_len, _ = hidden_states.size()

        query_states = self.q_proj(hidden_states)
        key_states = self.k_proj(hidden_states)
        value_states = self.v_proj(hidden_states)

        query_states = query_states.view(bsz, q_len, self.num_heads, self.head_dim).transpose(1, 2)
        key_states = key_states.view(bsz, q_len, self.num_key_value_heads, self.head_dim).transpose(1, 2)
        value_states = value_states.view(bsz, q_len, self.num_key_value_heads, self.head_dim).transpose(1, 2)

        cos, sin = position_embeddings
        query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)

        if past_key_values is not None:
            # sin and cos are specific to RoPE models; cache_position needed for the static cache
            cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position}
            key_states, value_states = past_key_values.update(key_states, value_states, self.layer_idx, cache_kwargs)

        attention_interface: Callable = eager_attention_forward

        if self.config._attn_implementation != "eager":
            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]

        attn_output, attn_weights = attention_interface(
            self,
            query_states,
            key_states,
            value_states,
            attention_mask,
            dropout=0.0 if not self.training else self.dropout,
            scaling=self.scaling,
            **kwargs,
        )

        attn_output = attn_output.reshape(bsz, q_len, -1).contiguous()
        attn_output = self.o_proj(attn_output)

        return attn_output, attn_weights


# Copied from transformers.models.gemma2.modeling_gemma2.Gemma2MLP with Gemma2->MllamaText
class MllamaTextMLP(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.hidden_size = config.hidden_size
        self.intermediate_size = config.intermediate_size
        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
        # Ignore copy
        self.act_fn = ACT2FN[config.hidden_act]

    def forward(self, x):
        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
        return down_proj


# Modified from transformers.models.llama.modeling_llama.LlamaDecoderLayer
class MllamaSelfAttentionDecoderLayer(GradientCheckpointingLayer):
    def __init__(self, config: MllamaTextConfig, layer_idx: int):
        super().__init__()
        self.hidden_size = config.hidden_size

        self.self_attn = MllamaTextSelfAttention(config=config, layer_idx=layer_idx)

        self.mlp = MllamaTextMLP(config)
        self.input_layernorm = MllamaTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
        self.post_attention_layernorm = MllamaTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)

        self.layer_idx = layer_idx

    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
    def forward(
        self,
        hidden_states: torch.Tensor,
        cross_attention_states: Optional[torch.Tensor] = None,
        cross_attention_mask: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        full_text_row_masked_out_mask: Optional[tuple[torch.Tensor, torch.Tensor]] = None,
        position_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Cache] = None,
        use_cache: Optional[bool] = False,
        cache_position: Optional[torch.LongTensor] = None,
        position_embeddings: Optional[tuple[torch.Tensor, torch.Tensor]] = None,  # necessary, but kept here for BC
        **kwargs: Unpack[FlashAttentionKwargs],
    ) -> tuple[torch.FloatTensor, Optional[tuple[torch.FloatTensor, torch.FloatTensor]]]:
        """
        Args:
            hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)`
            attention_mask (`torch.FloatTensor`, *optional*):
                attention mask of size `(batch_size, sequence_length)` if flash attention is used or `(batch_size, 1,
                query_sequence_length, key_sequence_length)` if default attention is used.

            use_cache (`bool`, *optional*):
                If set to `True`, `past_key_values` key value states are returned and can be used to speed up decoding
                (see `past_key_values`).
            past_key_values (`Cache`, *optional*): cached past key and value projection states
            cache_position (`torch.LongTensor` of shape `(sequence_length)`, *optional*):
                Indices depicting the position of the input sequence tokens in the sequence
            position_embeddings (`tuple[torch.FloatTensor, torch.FloatTensor]`, *optional*):
                Tuple containing the cosine and sine positional embeddings of shape `(batch_size, seq_len, head_dim)`,
                with `head_dim` being the embedding dimension of each attention head.
            kwargs (`dict`, *optional*):
                Arbitrary kwargs to be ignored, used for FSDP and other methods that injects code
                into the model
        """
        residual = hidden_states

        hidden_states = self.input_layernorm(hidden_states)

        # Self Attention
        hidden_states, self_attn_weights = self.self_attn(
            hidden_states=hidden_states,
            attention_mask=attention_mask,
            position_ids=position_ids,
            past_key_values=past_key_values,
            use_cache=use_cache,
            cache_position=cache_position,
            position_embeddings=position_embeddings,
            **kwargs,
        )
        hidden_states = residual + hidden_states

        # Fully Connected
        residual = hidden_states
        hidden_states = self.post_attention_layernorm(hidden_states)
        hidden_states = self.mlp(hidden_states)
        hidden_states = residual + hidden_states

        return hidden_states


class MllamaCrossAttentionDecoderLayer(GradientCheckpointingLayer):
    """Cross-attention transformer block with tanh-gated attention and feedforward."""

    def __init__(self, config: MllamaTextConfig, layer_idx: int) -> None:
        super().__init__()
        self.layer_idx = layer_idx
        self.cross_attn = MllamaTextCrossAttention(config, layer_idx=layer_idx)

        self.input_layernorm = MllamaTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
        self.cross_attn_attn_gate = torch.nn.Parameter(torch.zeros(1))

        self.mlp = MllamaTextMLP(config)
        self.post_attention_layernorm = MllamaTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
        self.cross_attn_mlp_gate = torch.nn.Parameter(torch.zeros(1))

    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
    def forward(
        self,
        hidden_states: torch.Tensor,
        cross_attention_states: torch.Tensor,
        cross_attention_mask: torch.Tensor,
        attention_mask: torch.Tensor,
        full_text_row_masked_out_mask: tuple[torch.Tensor, torch.Tensor],
        position_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Cache] = None,
        use_cache: Optional[bool] = False,
        cache_position: Optional[torch.LongTensor] = None,
        position_embeddings: Optional[torch.Tensor] = None,
        **kwargs: Unpack[FlashAttentionKwargs],
    ) -> tuple[torch.Tensor]:
        residual = hidden_states
        hidden_states = self.input_layernorm(hidden_states)

        hidden_states, attn_weights = self.cross_attn(
            hidden_states=hidden_states,
            attention_mask=cross_attention_mask,
            cross_attention_states=cross_attention_states,
            past_key_values=past_key_values,
            cache_position=cache_position,
            **kwargs,
        )
        hidden_states = residual + self.cross_attn_attn_gate.tanh() * hidden_states

        residual = hidden_states
        hidden_states = self.post_attention_layernorm(hidden_states)
        hidden_states = self.mlp(hidden_states)
        if full_text_row_masked_out_mask is not None:
            hidden_states = full_text_row_masked_out_mask[:, 0] * hidden_states  # type: ignore
        hidden_states = residual + self.cross_attn_mlp_gate.tanh() * hidden_states

        return hidden_states


class MllamaRotaryEmbedding(nn.Module):
    inv_freq: torch.Tensor  # fix linting for `register_buffer`

    def __init__(self, config: MllamaTextConfig, device=None):
        super().__init__()
        self.rope_type = config.rope_scaling["rope_type"]
        self.max_seq_len_cached = config.max_position_embeddings
        self.original_max_seq_len = config.max_position_embeddings

        self.config = config
        self.rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]
        inv_freq, self.attention_scaling = self.rope_init_fn(self.config, device)
        self.register_buffer("inv_freq", inv_freq, persistent=False)
        self.original_inv_freq = self.inv_freq

    @torch.no_grad()
    @dynamic_rope_update  # power user: used with advanced RoPE types (e.g. dynamic rope)
    def forward(self, x, position_ids):
        inv_freq_expanded = self.inv_freq[None, :, None].float().expand(position_ids.shape[0], -1, 1)
        position_ids_expanded = position_ids[:, None, :].float()

        device_type = x.device.type if isinstance(x.device.type, str) and x.device.type != "mps" else "cpu"
        with torch.autocast(device_type=device_type, enabled=False):  # Force float32
            freqs = (inv_freq_expanded.float() @ position_ids_expanded.float()).transpose(1, 2)
            emb = torch.cat((freqs, freqs), dim=-1)
            cos = emb.cos() * self.attention_scaling
            sin = emb.sin() * self.attention_scaling

        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)


@auto_docstring
class MllamaPreTrainedModel(PreTrainedModel):
    config: MllamaConfig
    base_model_prefix = ""
    supports_gradient_checkpointing = True
    _no_split_modules = [
        "MllamaVisionEncoderLayer",
        "MllamaCrossAttentionDecoderLayer",
        "MllamaSelfAttentionDecoderLayer",
    ]
    _can_compile_fullgraph = False  # static cache cannot have different shapes for each layer
    _supports_sdpa = True
    _supports_flash_attn = True
    _supports_flex_attn = True
    _supports_attention_backend = True
    _can_record_outputs = {
        "hidden_states": [MllamaSelfAttentionDecoderLayer, MllamaCrossAttentionDecoderLayer],
        "attentions": [
            OutputRecorder(MllamaTextSelfAttention, index=1, layer_name="self_attn"),
            OutputRecorder(MllamaTextSelfAttention, index=1, layer_name="cross_attn"),
            OutputRecorder(MllamaTextCrossAttention, index=1, layer_name="cross_attn"),
        ],
    }

    def _init_weights(self, module):
        std = getattr(self.config, "initializer_range", self.config.get_text_config().initializer_range)

        if isinstance(module, (nn.Linear, nn.Conv2d)):
            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_()
        elif isinstance(module, nn.LayerNorm):
            module.weight.data.fill_(1.0)
            module.bias.data.zero_()
        elif isinstance(module, MllamaTextRMSNorm):
            module.weight.data.fill_(1.0)
        elif isinstance(module, MllamaVisionModel):
            nn.init.normal_(module.class_embedding.data, std=std)
        elif isinstance(module, MllamaPrecomputedPositionEmbedding):
            nn.init.normal_(module.embedding.data, std=std)
            nn.init.zeros_(module.gate.data)
        elif isinstance(module, MllamaVisionEncoderLayer) and module.is_gated:
            nn.init.normal_(module.gate_attn.data, std=std)
            nn.init.normal_(module.gate_ffn.data, std=std)
        elif isinstance(module, MllamaCrossAttentionDecoderLayer):
            module.cross_attn_attn_gate.data.zero_()
            module.cross_attn_mlp_gate.data.zero_()
        elif isinstance(module, MllamaPrecomputedAspectRatioEmbedding):
            if module.is_gated:
                module.gate.data.zero_()

    # Copied from transformers.models.gptj.modeling_gptj.GPTJModel._update_causal_mask
    def _update_causal_mask(
        self,
        attention_mask: Union[torch.Tensor, "BlockMask"],
        input_tensor: torch.Tensor,
        cache_position: torch.Tensor,
        past_key_values: Cache,
        output_attentions: bool = False,
    ):
        if self.config._attn_implementation == "flash_attention_2":
            if attention_mask is not None and (attention_mask == 0.0).any():
                return attention_mask
            return None
        if self.config._attn_implementation == "flex_attention":
            if isinstance(attention_mask, torch.Tensor):
                attention_mask = make_flex_block_causal_mask(attention_mask)
            return attention_mask

        # For SDPA, when possible, we will rely on its `is_causal` argument instead of its `attn_mask` argument, in
        # order to dispatch on Flash Attention 2. This feature is not compatible with static cache, as SDPA will fail
        # to infer the attention mask.
        past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
        using_compilable_cache = past_key_values.is_compileable if past_key_values is not None else False

        # When output attentions is True, sdpa implementation's forward method calls the eager implementation's forward
        if self.config._attn_implementation == "sdpa" and not using_compilable_cache and not output_attentions:
            if AttentionMaskConverter._ignore_causal_mask_sdpa(
                attention_mask,
                inputs_embeds=input_tensor,
                past_key_values_length=past_seen_tokens,
                is_training=self.training,
            ):
                return None

        dtype = input_tensor.dtype
        sequence_length = input_tensor.shape[1]
        if using_compilable_cache:
            target_length = past_key_values.get_max_cache_shape()
        else:
            target_length = (
                attention_mask.shape[-1]
                if isinstance(attention_mask, torch.Tensor)
                else past_seen_tokens + sequence_length + 1
            )

        # In case the provided `attention` mask is 2D, we generate a causal mask here (4D).
        causal_mask = self._prepare_4d_causal_attention_mask_with_cache_position(
            attention_mask,
            sequence_length=sequence_length,
            target_length=target_length,
            dtype=dtype,
            cache_position=cache_position,
            batch_size=input_tensor.shape[0],
        )

        if (
            self.config._attn_implementation == "sdpa"
            and attention_mask is not None
            and attention_mask.device.type in ["cuda", "xpu", "npu"]
            and not output_attentions
        ):
            # Attend to all tokens in fully masked rows in the causal_mask, for example the relevant first rows when
            # using left padding. This is required by F.scaled_dot_product_attention memory-efficient attention path.
            # Details: https://github.com/pytorch/pytorch/issues/110213
            min_dtype = torch.finfo(dtype).min
            causal_mask = AttentionMaskConverter._unmask_unattended(causal_mask, min_dtype)

        return causal_mask

    @staticmethod
    # Copied from transformers.models.gptj.modeling_gptj.GPTJModel._prepare_4d_causal_attention_mask_with_cache_position
    def _prepare_4d_causal_attention_mask_with_cache_position(
        attention_mask: torch.Tensor,
        sequence_length: int,
        target_length: int,
        dtype: torch.dtype,
        cache_position: torch.Tensor,
        batch_size: int,
        **kwargs,
    ):
        """
        Creates a causal 4D mask of shape `(batch_size, 1, query_length, key_value_length)` from a 2D mask of shape
        `(batch_size, key_value_length)`, or if the input `attention_mask` is already 4D, do nothing.

        Args:
            attention_mask (`torch.Tensor`):
                A 2D attention mask of shape `(batch_size, key_value_length)` or a 4D attention mask of shape
                `(batch_size, 1, query_length, key_value_length)`.
            sequence_length (`int`):
                The sequence length being processed.
            target_length (`int`):
                The target length: when generating with static cache, the mask should be as long as the static cache,
                to account for the 0 padding, the part of the cache that is not filled yet.
            dtype (`torch.dtype`):
                The dtype to use for the 4D attention mask.
            cache_position (`torch.Tensor`):
                Indices depicting the position of the input sequence tokens in the sequence.
            batch_size (`torch.Tensor`):
                Batch size.
        """
        if attention_mask is not None and attention_mask.dim() == 4:
            # In this case we assume that the mask comes already in inverted form and requires no inversion or slicing.
            causal_mask = attention_mask
        else:
            min_dtype = torch.finfo(dtype).min
            causal_mask = torch.full(
                (sequence_length, target_length), fill_value=min_dtype, dtype=dtype, device=cache_position.device
            )
            if sequence_length != 1:
                causal_mask = torch.triu(causal_mask, diagonal=1)
            causal_mask *= torch.arange(target_length, device=cache_position.device) > cache_position.reshape(-1, 1)
            causal_mask = causal_mask[None, None, :, :].expand(batch_size, 1, -1, -1)
            if attention_mask is not None:
                causal_mask = causal_mask.clone()  # copy to contiguous memory for in-place edit
                mask_length = attention_mask.shape[-1]
                padding_mask = causal_mask[:, :, :, :mask_length] + attention_mask[:, None, None, :].to(
                    causal_mask.device
                )
                padding_mask = padding_mask == 0
                causal_mask[:, :, :, :mask_length] = causal_mask[:, :, :, :mask_length].masked_fill(
                    padding_mask, min_dtype
                )

        return causal_mask


@auto_docstring(
    custom_intro="""
    The Mllama Vision Model which consists of two vision encoders.
    """
)
class MllamaVisionModel(MllamaPreTrainedModel):
    config: MllamaVisionConfig
    base_model_prefix = "vision_model"

    def __init__(self, config: MllamaVisionConfig):
        super().__init__(config)
        self.image_size = config.image_size
        self.patch_size = config.patch_size
        self.max_num_tiles = config.max_num_tiles
        self.hidden_size = config.hidden_size
        self.num_channels = config.num_channels
        self.intermediate_layers_indices = config.intermediate_layers_indices

        self.num_patches = (self.image_size // self.patch_size) ** 2 + 1
        self.scale = config.hidden_size**-0.5

        self.patch_embedding = nn.Conv2d(
            in_channels=config.num_channels,
            out_channels=self.hidden_size,
            kernel_size=self.patch_size,
            stride=self.patch_size,
            padding="valid",
            bias=False,
        )

        self.class_embedding = nn.Parameter(self.scale * torch.randn(self.hidden_size))
        self.gated_positional_embedding = MllamaPrecomputedPositionEmbedding(config)

        self.pre_tile_positional_embedding = MllamaPrecomputedAspectRatioEmbedding(config, is_gated=True)
        self.post_tile_positional_embedding = MllamaPrecomputedAspectRatioEmbedding(config, is_gated=True)

        # layer norms
        self.layernorm_pre = nn.LayerNorm(self.hidden_size)
        self.layernorm_post = nn.LayerNorm(self.hidden_size)

        # encoders
        self.transformer = MllamaVisionEncoder(config, config.num_hidden_layers, is_gated=False)
        self.global_transformer = MllamaVisionEncoder(config, config.num_global_layers, is_gated=True)

        self.post_init()

    def get_input_embeddings(self):
        """
        This function is used to fetch the first embedding layer to activate grads on inputs.
        """
        return self.patch_embedding

    def apply_class_embedding(self, hidden_state: torch.Tensor) -> torch.Tensor:
        batch_size, _, hidden_size = hidden_state.shape
        class_embedding = self.class_embedding.expand(batch_size, 1, hidden_size)
        hidden_state = torch.cat([class_embedding, hidden_state], dim=1)
        return hidden_state

    @check_model_inputs
    @auto_docstring
    def forward(
        self, pixel_values: torch.Tensor, aspect_ratio_ids: torch.Tensor, aspect_ratio_mask: torch.Tensor, **kwargs
    ) -> BaseModelOutput:
        r"""
        aspect_ratio_ids (`torch.Tensor` of shape `(batch_size, max_num_images)`, *optional*):
            Aspect ratio ids used to select the appropriate precomputed tile embeddings based on the aspect ratio of each input image.
            These ids correspond to indices in the model's list of supported aspect ratios, offset by 1.

            For example, if the model supports aspect ratios [[1, 1], [1, 2], [2, 1]]:
            - An image with aspect ratio [1, 1] would have ID 1
            - An image with aspect ratio [1, 2] would have ID 2
            - An image with aspect ratio [2, 1] would have ID 3

            The id 0 is reserved for padding (i.e., no image).

            If an image has aspect ratio [1, 2], that means it was split into 2 tiles horizontally, and its `aspect_ratio_id` would be 2.
        aspect_ratio_mask (`torch.Tensor` of shape `(batch_size, max_num_images, max_num_tiles)`, *optional*):
            Mask to avoid performing attention on padding tiles. Mask values selected in `[0, 1]`:

            - 1 for tiles that are **not masked**,
            - 0 for tiles that are **masked**.

        Example:

        ```python
        >>> from PIL import Image
        >>> import requests
        >>> from transformers import AutoProcessor, MllamaVisionModel

        >>> checkpoint = "meta-llama/Llama-3.2-11B-Vision"
        >>> model = MllamaVisionModel.from_pretrained(checkpoint)
        >>> processor = AutoProcessor.from_pretrained(checkpoint)

        >>> url = "https://www.ilankelman.org/stopsigns/australia.jpg"
        >>> image = Image.open(requests.get(url, stream=True).raw)
        >>> inputs = processor(images=image, return_tensors="pt")

        >>> output = model(**inputs)

        >>> print(output.last_hidden_state.shape)
        torch.Size([1, 1, 4, 1025, 7680])
        ```
        """
        batch_size, num_concurrent_media, num_tiles, num_channels, height, width = pixel_values.shape

        pixel_values = pixel_values.reshape(batch_size * num_concurrent_media * num_tiles, num_channels, height, width)
        aspect_ratio_ids = aspect_ratio_ids.reshape(batch_size * num_concurrent_media, -1)

        # Patch embedding
        target_dtype = self.patch_embedding.weight.dtype
        target_device = self.patch_embedding.weight.device
        patch_embeds = self.patch_embedding(pixel_values.to(target_device, target_dtype))
        hidden_state = patch_embeds.flatten(2).transpose(1, 2)

        # Tile embeddings
        _, num_patches, dim = hidden_state.shape
        hidden_state = hidden_state.reshape(batch_size * num_concurrent_media, num_tiles, -1, dim)
        hidden_state = self.pre_tile_positional_embedding(hidden_state, aspect_ratio_ids)

        # Add cls token
        hidden_state = hidden_state.reshape(batch_size * num_concurrent_media * num_tiles, num_patches, dim)
        hidden_state = self.apply_class_embedding(hidden_state)
        num_patches += 1

        # Position embeddings
        hidden_state = hidden_state.reshape(batch_size * num_concurrent_media, num_tiles, num_patches, dim)
        hidden_state = self.gated_positional_embedding(hidden_state, aspect_ratio_ids)

        hidden_state = self.layernorm_pre(hidden_state)

        # Compute the number of tokens to pad
        num_padding_patches = (8 - (hidden_state.shape[-2] % 8)) % 8
        # Compute padding tuple for pad function
        padding = (0, 0, 0, num_padding_patches)  # (pad_left, pad_right, pad_left for dim -2, pad_right for dim -2)
        # Pad the tensor
        hidden_state = F.pad(hidden_state, padding, mode="constant", value=0)
        slice_index = -num_padding_patches if num_padding_patches > 0 else None

        # Prepare attention mask
        attention_mask = aspect_ratio_mask.reshape(batch_size * num_concurrent_media, -1)
        attention_mask = _prepare_aspect_ratio_attention_mask(
            aspect_ratio_mask=attention_mask,
            num_patches=self.num_patches,
            target_length=hidden_state.shape[2],
            dtype=self.dtype,
        )

        # Apply encoder
        hidden_state = hidden_state.view(batch_size * num_concurrent_media, -1, dim)
        output = self.transformer(
            hidden_state,
            attention_mask=attention_mask,
        )
        hidden_state = output.last_hidden_state

        hidden_state = self.layernorm_post(hidden_state)

        # Apply global encoder
        hidden_state = hidden_state.reshape(
            batch_size * num_concurrent_media, num_tiles, num_patches + num_padding_patches, dim
        )
        hidden_state = self.post_tile_positional_embedding(hidden_state, aspect_ratio_ids)
        hidden_state = hidden_state.reshape(
            batch_size * num_concurrent_media, num_tiles * (num_patches + num_padding_patches), dim
        )
        global_output = self.global_transformer(
            hidden_state,
            attention_mask=attention_mask,
        )
        hidden_state = global_output.last_hidden_state

        # Remove padding form hidden state
        hidden_state = hidden_state.reshape(
            batch_size * num_concurrent_media, num_tiles, num_patches + num_padding_patches, dim
        )
        hidden_state = hidden_state[:, :, :slice_index]
        hidden_state = hidden_state.reshape(batch_size, num_concurrent_media, num_tiles, num_patches, dim)

        # Collect intermediate layer outputs from encoder output
        all_intermediate_hidden_states = [output.hidden_states[i] for i in self.intermediate_layers_indices]
        intermediate_hidden_states = torch.stack(all_intermediate_hidden_states, dim=-1)

        # Remove padding from intermediate hidden states
        intermediate_hidden_states = intermediate_hidden_states.reshape(
            batch_size * num_concurrent_media, num_tiles, num_patches + num_padding_patches, -1
        )
        intermediate_hidden_states = intermediate_hidden_states[:, :, :slice_index]
        intermediate_hidden_states = intermediate_hidden_states.reshape(
            batch_size, num_concurrent_media, num_tiles, num_patches, -1
        )

        # Concatenate final hidden state and intermediate hidden states
        hidden_state = torch.cat([hidden_state, intermediate_hidden_states], dim=-1)

        return BaseModelOutput(last_hidden_state=hidden_state)


@auto_docstring(
    custom_intro="""
    The Mllama Text Model which consists of transformer with self and cross attention layers.
    """
)
class MllamaTextModel(MllamaPreTrainedModel):
    config: MllamaTextConfig
    base_model_prefix = "language_model.model"

    def __init__(self, config: MllamaTextConfig):
        super().__init__(config)
        self.padding_idx = config.pad_token_id
        self.vocab_size = config.vocab_size
        self.embed_tokens = nn.Embedding(config.vocab_size + 8, config.hidden_size, self.padding_idx)
        self.cross_attention_layers = config.cross_attention_layers

        layers = []
        for layer_idx in range(config.num_hidden_layers):
            if layer_idx in self.cross_attention_layers:
                layers.append(MllamaCrossAttentionDecoderLayer(config, layer_idx))
            else:
                layers.append(MllamaSelfAttentionDecoderLayer(config, layer_idx))

        self.layers = nn.ModuleList(layers)
        self.norm = MllamaTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
        self.rotary_emb = MllamaRotaryEmbedding(config=config)
        self.gradient_checkpointing = False
        self.post_init()

    @check_model_inputs
    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        cross_attention_states: Optional[torch.FloatTensor] = None,
        cross_attention_mask: Optional[torch.Tensor] = None,
        full_text_row_masked_out_mask: Optional[tuple[torch.Tensor, torch.Tensor]] = None,
        past_key_values: Optional[Union[Cache, list[torch.FloatTensor]]] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        use_cache: Optional[bool] = None,
        cache_position: Optional[torch.LongTensor] = None,
        **kwargs: Unpack[FlashAttentionKwargs],
    ) -> BaseModelOutputWithPast:
        r"""
        cross_attention_states (`torch.FloatTensor`, *optional*):
            Output of the vision model, used for cross-attention. This tensor contains the processed image features that
            the language model will attend to.
        cross_attention_mask (`torch.Tensor` of shape `(batch_size, seq_length, max_num_images, max_num_tiles)`, *optional*):
            Cross-attention mask to control the interaction between text tokens and image tiles.
            This 4D tensor defines which image tiles each text token should attend to.

            For each text token (in seq_length):
            - 1 indicates the token **should attend** to the corresponding image tile
            - 0 indicates the token **should not attend** to the corresponding image tile
        full_text_row_masked_out_mask (`tuple[torch.Tensor, torch.Tensor]`, *optional*):
            A tuple containing two tensors that mask out rows in the cross-attention mechanism:
            - The first tensor has shape `(batch_size, 1, seq_length, 1)` and contains values of 0 or 1.
              A value of 0 indicates that the corresponding text token's entire row in the cross-attention
              matrix should be masked out (all image tokens ignored).
            - The second tensor has the same shape and is used internally to apply the masking during
              the forward pass of cross-attention layers.
            This mask is derived from the cross_attention_mask and is used to handle cases where a text token
            should not attend to any image token.

        Example:

        ```python
        >>> from transformers import AutoProcessor, MllamaTextModel

        >>> checkpoint = "meta-llama/Llama-3.2-11B-Vision"
        >>> model = MllamaTextModel.from_pretrained(checkpoint)
        >>> processor = AutoProcessor.from_pretrained(checkpoint)

        >>> text = "<|image|>If I had to write a haiku for this one"
        >>> inputs = processor(text=text, return_tensors="pt")

        >>> output = model(**inputs)

        >>> print(output.last_hidden_state.shape)
        torch.Size([1, 13, 4096])
        ```
        """
        use_cache = use_cache if use_cache is not None else self.config.use_cache

        if (input_ids is None) ^ (inputs_embeds is not None):
            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")

        if inputs_embeds is None:
            inputs_embeds = self.embed_tokens(input_ids)

        hidden_states = inputs_embeds

        if use_cache and past_key_values is None:
            past_key_values = DynamicCache(config=self.config)

        if cache_position is None:
            past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
            cache_position = torch.arange(
                past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1], device=inputs_embeds.device
            )
        if position_ids is None:
            position_ids = cache_position.unsqueeze(0)

        causal_mask = self._update_causal_mask(attention_mask, inputs_embeds, cache_position, past_key_values)

        # create position embeddings to be shared across the decoder layers
        position_embeddings = self.rotary_emb(hidden_states, position_ids)

        # decoder layers
        for idx, decoder_layer in enumerate(self.layers):
            # For text-only path we should skip cross attention layers.
            # Let's check if the layer is cross attention layer and if we have cross attention states
            # or cached cross attention states.
            is_cross_attention_layer = idx in self.cross_attention_layers
            is_cross_attention_cache_empty = past_key_values is None or (
                past_key_values is not None and past_key_values.get_seq_length(idx) == 0
            )

            if is_cross_attention_layer and cross_attention_states is None and is_cross_attention_cache_empty:
                continue

            hidden_states = decoder_layer(
                hidden_states,
                cross_attention_states=cross_attention_states,
                cross_attention_mask=cross_attention_mask,
                attention_mask=causal_mask,
                full_text_row_masked_out_mask=full_text_row_masked_out_mask,
                position_ids=position_ids,
                past_key_values=past_key_values,
                use_cache=use_cache,
                cache_position=cache_position,
                position_embeddings=position_embeddings,
                **kwargs,
            )

        hidden_states = self.norm(hidden_states)

        return BaseModelOutputWithPast(
            last_hidden_state=hidden_states,
            past_key_values=past_key_values,
        )


@auto_docstring(
    custom_intro="""
    The Mllama Text Model with a language modeling head on top.
    """
)
class MllamaForCausalLM(MllamaPreTrainedModel, GenerationMixin):
    config: MllamaTextConfig
    _can_compile_fullgraph = True  # only the LLM without cross attn can do compile
    base_model_prefix = "language_model"
    _tied_weights_keys = ["lm_head.weight"]

    def __init__(self, config):
        super().__init__(config.get_text_config())
        self.text_config = config.get_text_config()
        self.vocab_size = self.text_config.vocab_size
        self.model = MllamaTextModel._from_config(self.text_config)
        self.lm_head = nn.Linear(self.text_config.hidden_size, self.vocab_size, bias=False)

        self.post_init()

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        cross_attention_states: Optional[torch.LongTensor] = None,
        cross_attention_mask: Optional[torch.LongTensor] = None,
        full_text_row_masked_out_mask: Optional[tuple[torch.Tensor, torch.Tensor]] = None,
        past_key_values: Optional[Union[Cache, list[torch.FloatTensor]]] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        labels: Optional[torch.LongTensor] = None,
        use_cache: Optional[bool] = None,
        cache_position: Optional[torch.LongTensor] = None,
        logits_to_keep: Union[int, torch.Tensor] = 0,
        **kwargs: Unpack[TransformersKwargs],
    ) -> Union[tuple, CausalLMOutputWithPast]:
        r"""
        cross_attention_states (`torch.FloatTensor`, *optional*):
            Output of the vision model, used for cross-attention. This tensor contains the processed image features that
            the language model will attend to.
        cross_attention_mask (`torch.Tensor` of shape `(batch_size, seq_length, max_num_images, max_num_tiles)`, *optional*):
            Cross-attention mask to control the interaction between text tokens and image tiles.
            This 4D tensor defines which image tiles each text token should attend to.

            For each text token (in seq_length):
            - 1 indicates the token **should attend** to the corresponding image tile
            - 0 indicates the token **should not attend** to the corresponding image tile
        full_text_row_masked_out_mask (`tuple[torch.Tensor, torch.Tensor]`, *optional*):
            A tuple containing two tensors that mask out rows in the cross-attention mechanism:
            - The first tensor has shape `(batch_size, 1, seq_length, 1)` and contains values of 0 or 1.
              A value of 0 indicates that the corresponding text token's entire row in the cross-attention
              matrix should be masked out (all image tokens ignored).
            - The second tensor has the same shape and is used internally to apply the masking during
              the forward pass of cross-attention layers.
            This mask is derived from the cross_attention_mask and is used to handle cases where a text token
            should not attend to any image token.
        labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Labels for computing the masked language modeling loss. Indices should either be in `[0, ...,
            config.vocab_size]` or -100 (see `input_ids` docstring). Tokens with indices set to `-100` are ignored
            (masked), the loss is only computed for the tokens with labels in `[0, ..., config.vocab_size]`.

        Example:

        ```python
        >>> from transformers import AutoTokenizer, MllamaForCausalLM

        >>> model = MllamaForCausalLM.from_pretrained("Llama-3.2-11B-Vision")
        >>> tokenizer = AutoTokenizer.from_pretrained("Llama-3.2-11B-Vision")

        >>> prompt = "If I had to write a haiku, it would be:"
        >>> inputs = tokenizer(prompt, return_tensors="pt")

        >>> # Generate
        >>> generate_ids = model.generate(inputs.input_ids, max_length=40, do_sample=True, temperature=0.6)
        >>> result = tokenizer.batch_decode(generate_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)[0]
        >>> print(result)
        If I had to write a haiku, it would be: "Snowflakes gently fall" - simple, yet peaceful.
        I love the idea of snowflakes gently falling, each one
        ```
        """
        # decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn)
        outputs = self.model(
            input_ids=input_ids,
            cross_attention_states=cross_attention_states,
            attention_mask=attention_mask,
            position_ids=position_ids,
            cross_attention_mask=cross_attention_mask,
            full_text_row_masked_out_mask=full_text_row_masked_out_mask,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            use_cache=use_cache,
            cache_position=cache_position,
            **kwargs,
        )

        hidden_states = outputs.last_hidden_state
        slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
        logits = self.lm_head(hidden_states[:, slice_indices, :]).float()

        loss = None
        if labels is not None:
            loss = self.loss_function(logits, labels, self.vocab_size, **kwargs)

        return CausalLMOutputWithPast(
            loss=loss,
            logits=logits,
            past_key_values=outputs.past_key_values,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
        )


@auto_docstring(
    custom_intro="""
    The Mllama model which consists of a vision encoder and a language model without language modeling head.
    """
)
class MllamaModel(MllamaPreTrainedModel):
    _checkpoint_conversion_mapping = {"language_model.model": "language_model"}

    def __init__(self, config: MllamaConfig):
        super().__init__(config)
        self.vocab_size = config.text_config.vocab_size
        self.hidden_size = config.text_config.hidden_size
        self.max_num_tiles = config.vision_config.max_num_tiles
        self.vision_output_dim = config.vision_config.vision_output_dim
        self.pad_token_id = self.config.pad_token_id if self.config.pad_token_id is not None else -1

        self.vision_model = MllamaVisionModel._from_config(config.vision_config)
        self.language_model = MllamaTextModel._from_config(config.text_config)
        self.multi_modal_projector = nn.Linear(
            config.vision_config.vision_output_dim,
            config.text_config.hidden_size,
            bias=True,
        )
        self.post_init()

    def get_input_embeddings(self):
        return self.language_model.get_input_embeddings()

    def set_input_embeddings(self, value):
        self.language_model.set_input_embeddings(value)

    def set_decoder(self, decoder):
        self.language_model = decoder

    def get_decoder(self):
        return self.language_model

    @check_model_inputs
    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        pixel_values: Optional[torch.FloatTensor] = None,
        aspect_ratio_mask: Optional[torch.Tensor] = None,
        aspect_ratio_ids: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        cross_attention_mask: Optional[torch.Tensor] = None,
        cross_attention_states: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Cache] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        use_cache: Optional[bool] = None,
        cache_position: Optional[torch.LongTensor] = None,
        **kwargs: Unpack[FlashAttentionKwargs],
    ) -> BaseModelOutputWithPast:
        r"""
        aspect_ratio_mask (`torch.Tensor` of shape `(batch_size, max_num_images, max_num_tiles)`, *optional*):
            Mask to avoid performing attention on padding tiles. Mask values selected in `[0, 1]`:

            - 1 for tiles that are **not masked**,
            - 0 for tiles that are **masked**.
        aspect_ratio_ids (`torch.Tensor` of shape `(batch_size, max_num_images)`, *optional*):
            Aspect ratio ids used to select the appropriate precomputed tile embeddings based on the aspect ratio of each input image.
            These ids correspond to indices in the model's list of supported aspect ratios, offset by 1.

            For example, if the model supports aspect ratios [[1, 1], [1, 2], [2, 1]]:
            - An image with aspect ratio [1, 1] would have ID 1
            - An image with aspect ratio [1, 2] would have ID 2
            - An image with aspect ratio [2, 1] would have ID 3

            The id 0 is reserved for padding (i.e., no image).

            If an image has aspect ratio [1, 2], that means it was split into 2 tiles horizontally, and its `aspect_ratio_id` would be 2.
        cross_attention_mask (`torch.Tensor` of shape `(batch_size, seq_length, max_num_images, max_num_tiles)`, *optional*):
            Cross-attention mask to control the interaction between text tokens and image tiles.
            This 4D tensor defines which image tiles each text token should attend to.

            For each text token (in seq_length):
            - 1 indicates the token **should attend** to the corresponding image tile
            - 0 indicates the token **should not attend** to the corresponding image tile
        cross_attention_states (`torch.FloatTensor`, *optional*):
            Output of the vision model, used for cross-attention. This tensor contains the processed image features that
            the language model will attend to.
        """
        if (input_ids is None) ^ (inputs_embeds is not None):
            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")

        if pixel_values is not None and cross_attention_states is not None:
            raise ValueError("`pixel_values` and `cross_attention_states` cannot be provided simultaneously")

        if pixel_values is not None:
            if aspect_ratio_ids is None:
                raise ValueError("`aspect_ratio_ids` must be provided if `pixel_values` is provided")
            # get vision tokens from vision model
            vision_outputs = self.vision_model(
                pixel_values=pixel_values,
                aspect_ratio_ids=aspect_ratio_ids,
                aspect_ratio_mask=aspect_ratio_mask,
            )
            cross_attention_states = vision_outputs.last_hidden_state
            cross_attention_states = self.multi_modal_projector(cross_attention_states).reshape(
                -1, cross_attention_states.shape[-2], self.hidden_size
            )

        if cross_attention_mask is not None:
            cross_attention_mask, full_text_row_masked_out_mask = _prepare_cross_attention_mask(
                cross_attention_mask,
                num_vision_tokens=self.vision_model.num_patches,
                dtype=self.dtype,
            )
        else:
            full_text_row_masked_out_mask = None

        if cross_attention_mask is not None and cache_position is not None:
            cross_attention_mask = cross_attention_mask[:, :, cache_position]
            full_text_row_masked_out_mask = full_text_row_masked_out_mask[:, :, cache_position]

        outputs = self.language_model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            position_ids=position_ids,
            cross_attention_states=cross_attention_states,
            cross_attention_mask=cross_attention_mask,
            full_text_row_masked_out_mask=full_text_row_masked_out_mask,
            past_key_values=past_key_values,
            use_cache=use_cache,
            inputs_embeds=inputs_embeds,
            cache_position=cache_position,
            **kwargs,
        )

        return BaseModelOutputWithPast(
            last_hidden_state=outputs.last_hidden_state,
            past_key_values=outputs.past_key_values,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
        )


@auto_docstring(
    custom_intro="""
    The Mllama model which consists of a vision encoder and a language model.
    """,
)
class MllamaForConditionalGeneration(MllamaPreTrainedModel, GenerationMixin):
    _checkpoint_conversion_mapping = {
        "^language_model.model": "model.language_model",
        "^vision_model": "model.vision_model",
        "^multi_modal_projector": "model.multi_modal_projector",
        "^language_model.lm_head": "lm_head",
    }
    _tied_weights_keys = ["lm_head.weight"]

    def __init__(self, config: MllamaConfig):
        super().__init__(config)
        self.model = MllamaModel(config)
        self.lm_head = nn.Linear(config.text_config.hidden_size, config.text_config.vocab_size, bias=False)
        self.post_init()

    def get_input_embeddings(self):
        return self.model.get_input_embeddings()

    def set_input_embeddings(self, value):
        self.model.set_input_embeddings(value)

    def set_decoder(self, decoder):
        self.model.set_decoder(decoder)

    def get_decoder(self):
        return self.model.get_decoder()

    # Make modules available through conditional class for BC
    @property
    def language_model(self):
        return self.model.language_model

    @property
    def vision_model(self):
        return self.model.vision_model

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        pixel_values: Optional[torch.FloatTensor] = None,
        aspect_ratio_mask: Optional[torch.Tensor] = None,
        aspect_ratio_ids: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        cross_attention_mask: Optional[torch.Tensor] = None,
        cross_attention_states: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Union[Cache, list[torch.FloatTensor]]] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        labels: Optional[torch.LongTensor] = None,
        use_cache: Optional[bool] = None,
        cache_position: Optional[torch.LongTensor] = None,
        logits_to_keep: Union[int, torch.Tensor] = 0,
        **kwargs: Unpack[TransformersKwargs],
    ) -> Union[tuple, CausalLMOutputWithPast]:
        r"""
        aspect_ratio_mask (`torch.Tensor` of shape `(batch_size, max_num_images, max_num_tiles)`, *optional*):
            Mask to avoid performing attention on padding tiles. Mask values selected in `[0, 1]`:

            - 1 for tiles that are **not masked**,
            - 0 for tiles that are **masked**.
        aspect_ratio_ids (`torch.Tensor` of shape `(batch_size, max_num_images)`, *optional*):
            Aspect ratio ids used to select the appropriate precomputed tile embeddings based on the aspect ratio of each input image.
            These ids correspond to indices in the model's list of supported aspect ratios, offset by 1.

            For example, if the model supports aspect ratios [[1, 1], [1, 2], [2, 1]]:
            - An image with aspect ratio [1, 1] would have ID 1
            - An image with aspect ratio [1, 2] would have ID 2
            - An image with aspect ratio [2, 1] would have ID 3

            The id 0 is reserved for padding (i.e., no image).

            If an image has aspect ratio [1, 2], that means it was split into 2 tiles horizontally, and its `aspect_ratio_id` would be 2.
        cross_attention_mask (`torch.Tensor` of shape `(batch_size, seq_length, max_num_images, max_num_tiles)`, *optional*):
            Cross-attention mask to control the interaction between text tokens and image tiles.
            This 4D tensor defines which image tiles each text token should attend to.

            For each text token (in seq_length):
            - 1 indicates the token **should attend** to the corresponding image tile
            - 0 indicates the token **should not attend** to the corresponding image tile
        cross_attention_states (`torch.FloatTensor`, *optional*):
            Output of the vision model, used for cross-attention. This tensor contains the processed image features that
            the language model will attend to.
        labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Labels for computing the masked language modeling loss. Indices should either be in `[0, ...,
            config.vocab_size]` or -100 (see `input_ids` docstring). Tokens with indices set to `-100` are ignored
            (masked), the loss is only computed for the tokens with labels in `[0, ..., config.vocab_size]`.

        Example:

        ```python
        >>> from PIL import Image
        >>> import requests
        >>> from transformers import AutoProcessor, MllamaForConditionalGeneration

        >>> checkpoint = "meta-llama/Llama-3.2-11B-Vision"
        >>> model = MllamaForConditionalGeneration.from_pretrained(checkpoint)
        >>> processor = AutoProcessor.from_pretrained(checkpoint)

        >>> prompt = "<|image|>If I had to write a haiku for this one"
        >>> url = "https://www.ilankelman.org/stopsigns/australia.jpg"
        >>> image = Image.open(requests.get(url, stream=True).raw)

        >>> inputs = processor(text=prompt, images=image, return_tensors="pt")

        >>> # Generate
        >>> output = model.generate(**inputs, max_new_tokens=15)

        >>> prompt_len = inputs.input_ids.shape[-1]
        >>> generated_ids = output[:, prompt_len:]
        >>> generated_text = processor.batch_decode(generated_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)
        >>> print(generated_text)
        [', it would be:.\\nA stop sign in Chinatown.\\n']
        ```
        """
        outputs = self.model(
            input_ids=input_ids,
            pixel_values=pixel_values,
            aspect_ratio_mask=aspect_ratio_mask,
            aspect_ratio_ids=aspect_ratio_ids,
            cross_attention_mask=cross_attention_mask,
            cross_attention_states=cross_attention_states,
            attention_mask=attention_mask,
            position_ids=position_ids,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            use_cache=use_cache,
            cache_position=cache_position,
            **kwargs,
        )

        hidden_states = outputs.last_hidden_state
        # Only compute necessary logits, and do not upcast them to float if we are not computing the loss
        slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
        logits = self.lm_head(hidden_states[:, slice_indices, :])

        loss = None
        if labels is not None:
            loss = self.loss_function(logits, labels, self.config.text_config.vocab_size, **kwargs)

        return CausalLMOutputWithPast(
            loss=loss,
            logits=logits,
            past_key_values=outputs.past_key_values,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
        )

    def prepare_inputs_for_generation(
        self,
        input_ids=None,
        inputs_embeds=None,
        attention_mask=None,
        position_ids=None,
        pixel_values=None,
        aspect_ratio_ids=None,
        aspect_ratio_mask=None,
        cross_attention_mask=None,
        past_key_values=None,
        use_cache=False,
        cache_position=None,
        logits_to_keep=None,
        **kwargs,
    ):
        # Overwritten -- in specific circumstances we don't want to forward image inputs to the model

        model_inputs = super().prepare_inputs_for_generation(
            input_ids,
            past_key_values=past_key_values,
            use_cache=use_cache,
            inputs_embeds=inputs_embeds,
            position_ids=position_ids,
            attention_mask=attention_mask,
            pixel_values=pixel_values,
            aspect_ratio_ids=aspect_ratio_ids,
            aspect_ratio_mask=aspect_ratio_mask,
            cross_attention_mask=cross_attention_mask,
            cache_position=cache_position,
            logits_to_keep=logits_to_keep,
            **kwargs,
        )

        # If we're in pre-fill or cacheless decoding step, then we need pixel_values and aspect ratios
        # to compute image hidden states, otherwise they are cached within each cross attn layer
        if cache_position[0] != 0:
            model_inputs["pixel_values"] = None
            model_inputs["aspect_ratio_ids"] = None
            model_inputs["aspect_ratio_mask"] = None

        return model_inputs

    def _update_model_kwargs_for_generation(self, outputs, model_kwargs, is_encoder_decoder, **kwargs):
        cross_attention_mask_prev = model_kwargs.get("cross_attention_mask", None)
        model_kwargs = super()._update_model_kwargs_for_generation(
            outputs=outputs,
            model_kwargs=model_kwargs,
            is_encoder_decoder=is_encoder_decoder,
            **kwargs,
        )

        # add cross-attn mask for new token
        if cross_attention_mask_prev is not None:
            model_kwargs["cross_attention_mask"] = torch.cat(
                [cross_attention_mask_prev, cross_attention_mask_prev[:, -1:, ...]], dim=1
            )
        return model_kwargs


__all__ = [
    "MllamaForConditionalGeneration",
    "MllamaForCausalLM",
    "MllamaTextModel",
    "MllamaVisionModel",
    "MllamaPreTrainedModel",
    "MllamaModel",
]
