# Copyright 2024 Microsoft Research and 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
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#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
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"""PyTorch KOSMOS-2.5 model."""

import math
from collections.abc import Callable
from dataclasses import dataclass
from typing import Any

import torch
from torch import nn

from ... import initialization as init
from ...activations import ACT2FN
from ...cache_utils import Cache, DynamicCache
from ...generation import GenerationMixin
from ...masking_utils import create_causal_mask
from ...modeling_layers import GradientCheckpointingLayer
from ...modeling_outputs import (
    BaseModelOutput,
    BaseModelOutputWithPast,
    BaseModelOutputWithPastAndCrossAttentions,
    BaseModelOutputWithPooling,
    CausalLMOutputWithCrossAttentions,
)
from ...modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
from ...processing_utils import Unpack
from ...utils import (
    ModelOutput,
    TransformersKwargs,
    add_start_docstrings,
    add_start_docstrings_to_model_forward,
    can_return_tuple,
    logging,
    replace_return_docstrings,
)
from ...utils.generic import is_flash_attention_requested
from .configuration_kosmos2_5 import (
    Kosmos2_5Config,
    Kosmos2_5TextConfig,
    Kosmos2_5VisionConfig,
)


logger = logging.get_logger(__name__)

_CONFIG_FOR_DOC = Kosmos2_5Config


# Copied from transformers.models.kosmos2.modeling_kosmos2._expand_mask
def _expand_mask(mask: torch.Tensor, dtype: torch.dtype, tgt_len: int | None = None):
    """
    Expands attention_mask from `[bsz, seq_len]` to `[bsz, 1, tgt_seq_len, src_seq_len]`.
    """
    bsz, src_len = mask.size()
    tgt_len = tgt_len if tgt_len is not None else src_len

    expanded_mask = mask[:, None, None, :].expand(bsz, 1, tgt_len, src_len).to(dtype)

    inverted_mask = 1.0 - expanded_mask

    return inverted_mask.masked_fill(inverted_mask.to(torch.bool), torch.finfo(dtype).min)


KOSMOS2_5_START_DOCSTRING = r"""
    This model inherits from [`PreTrainedModel`]. Check the superclass documentation for the generic methods the
    library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
    etc.)

    This model is also a PyTorch [torch.nn.Module](https://pytorch.org/docs/stable/nn.html#torch.nn.Module) subclass.
    Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
    and behavior.

    Parameters:
        config ([`Kosmos2_5Config`]): Model configuration class with all the parameters of the model.
            Initializing with a config file does not load the weights associated with the model, only the
            configuration. Check out the [`~PreTrainedModel.from_pretrained`] method to load the model weights.
"""

KOSMOS2_5_VISION_INPUTS_DOCSTRING = r"""
    Args:
        flattened_patches (`torch.FloatTensor` of shape `(batch_size, max_patches, 2 + patch_height * patch_width * image_channels)`):
            Flattened patches of the images. `flattened_patches` can be obtained using [`AutoImageProcessor`]. See
            [`Kosmos2_5ImageProcessor.__call__`] for details.
        output_attentions (`bool`, *optional*):
            Whether or not to return the attentions tensors of all attention layers. See `attentions` under returned
            tensors for more detail.
        output_hidden_states (`bool`, *optional*):
            Whether or not to return the hidden states of all layers. See `hidden_states` under returned tensors for
            more detail.
"""

KOSMOS2_5_TEXT_INPUTS_DOCSTRING = r"""
    Args:
        input_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`):
            Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide
            it.

            Indices can be obtained using [`AutoTokenizer`]. See [`PreTrainedTokenizer.encode`] and
            [`PreTrainedTokenizer.__call__`] for details.

            [What are input IDs?](../glossary#input-ids)
        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)
        image_embeds: (`torch.FloatTensor` of shape `(batch_size, latent_query_num, hidden_size)`, *optional*):
            Sequence of hidden-states at the output of `Kosmos2ImageToTextProjection`.
        image_embeds_position_mask (`torch.Tensor` of shape `(batch_size, sequence_length)`, *optional*):
            Mask to indicate the location in a sequence to insert the image features . Mask values selected in `[0,
            1]`:

            - 1 for places where to put the image features,
            - 0 for places that are not for image features (i.e. for text tokens).

        past_key_values (`Cache` of length `config.n_layers` with each tuple having 4 tensors of shape `(batch_size, num_heads, sequence_length - 1, embed_size_per_head)`):
            Contains precomputed key and value hidden states of the attention blocks. Can be used to speed up decoding.

            If `past_key_values` are used, the user can optionally input only the last `decoder_input_ids` (those that
            don't have their past key value states given to this model) of shape `(batch_size, 1)` instead of all
            `decoder_input_ids` of shape `(batch_size, sequence_length)`.
        inputs_embeds (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`, *optional*):
            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.
        position_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Indices of positions of each input sequence tokens in the position embeddings. Selected in the range `[0,
            config.max_position_embeddings - 1]`.

            [What are position IDs?](../glossary#position-ids)
        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`).
        output_attentions (`bool`, *optional*):
            Whether or not to return the attentions tensors of all attention layers. See `attentions` under returned
            tensors for more detail.
        output_hidden_states (`bool`, *optional*):
            Whether or not to return the hidden states of all layers. See `hidden_states` under returned tensors for
            more detail.
"""

KOSMOS2_5_INPUTS_DOCSTRING = r"""
    Args:
        input_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`):
            Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide
            it.

            Indices can be obtained using [`AutoTokenizer`]. See [`PreTrainedTokenizer.encode`] and
            [`PreTrainedTokenizer.__call__`] for details.

            [What are input IDs?](../glossary#input-ids)
        flattened_patches (`torch.FloatTensor` of shape `(batch_size, max_patches, 2 + patch_height * patch_width * image_channels)`):
            Flattened patches of the images. `flattened_patches` can be obtained using [`AutoImageProcessor`]. See
            [`Kosmos2_5ImageProcessor.__call__`] for details.
        width (`torch.FloatTensor` of shape `(batch_size,)`):
            The original width (before resizing) of each image in the batch. This can be obtained using
            [`AutoImageProcessor`]. See [`Kosmos2_5ImageProcessor.__call__`] for details.
        height (`torch.FloatTensor` of shape `(batch_size,)`):
            The original height (before resizing) of each image in the batch. This can be obtained using
            [`AutoImageProcessor`]. See [`Kosmos2_5ImageProcessor.__call__`] for details.
        image_embeds_position_mask (`torch.Tensor` of shape `(batch_size, sequence_length)`, *optional*):
            Mask to indicate the location in a sequence to insert the image features . Mask values selected in `[0,
            1]`:

            - 1 for places where to put the image features,
            - 0 for places that are not for image features (i.e. for text tokens).

        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)

        past_key_values (`Cache` of length `config.n_layers` with each tuple having 4 tensors of shape `(batch_size, num_heads, sequence_length - 1, embed_size_per_head)`):
            Contains precomputed key and value hidden states of the attention blocks. Can be used to speed up decoding.

            If `past_key_values` are used, the user can optionally input only the last `decoder_input_ids` (those that
            don't have their past key value states given to this model) of shape `(batch_size, 1)` instead of all
            `decoder_input_ids` of shape `(batch_size, sequence_length)`.
        image_embeds: (`torch.FloatTensor` of shape `(batch_size, latent_query_num, hidden_size)`, *optional*):
            Sequence of hidden-states at the output of `Kosmos2ImageToTextProjection`.
        inputs_embeds (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`, *optional*):
            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.
        position_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Indices of positions of each input sequence tokens in the position embeddings. Selected in the range `[0,
            config.max_position_embeddings - 1]`.

            [What are position IDs?](../glossary#position-ids)
        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`).
        output_attentions (`bool`, *optional*):
            Whether or not to return the attentions tensors of all attention layers. See `attentions` under returned
            tensors for more detail.
        output_hidden_states (`bool`, *optional*):
            Whether or not to return the hidden states of all layers. See `hidden_states` under returned tensors for
            more detail.
"""


@dataclass
class Kosmos2_5ModelOutput(ModelOutput):
    """
    Base class for text model's outputs that also contains a pooling of the last hidden states.

    Args:
        last_hidden_state (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`):
            Sequence of hidden-states at the output of the last layer of the model.
        hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
            Tuple of `torch.FloatTensor` (one for the output of the embeddings, if the model has an embedding layer, +
            one for the output of each layer) of shape `(batch_size, sequence_length, hidden_size)`.

            Hidden-states of the model at the output of each layer plus the optional initial embedding outputs.
        attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`):
            Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
            sequence_length)`.

            Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
            heads.
        width (`torch.FloatTensor` of shape `(batch_size,)`):
            The original width (before resizing) of each image in the batch.
        height (`torch.FloatTensor` of shape `(batch_size,)`):
            The original height (before resizing) of each image in the batch.
        image_embeds (`torch.FloatTensor` of shape `(batch_size, latent_query_num, hidden_size)`, *optional*):
            Sequence of hidden-states at the output of `Kosmos2ImageToTextProjection`.
        projection_attentions (`tuple(torch.FloatTensor)`, *optional*):
            Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
            sequence_length)`.

            Attentions weights given by `Kosmos2ImageToTextProjection`, after the attention softmax, used to compute
            the weighted average in the self-attention heads.
        vision_model_output(`BaseModelOutputWithPooling`, *optional*):
            The output of the [`Kosmos2VisionModel`].
        past_key_values (`Cache`, *optional*, returned when `use_cache=True` is passed or when `config.use_cache=True`):
            It is a [`~cache_utils.Cache`] instance. For more details, see our [kv cache guide](https://huggingface.co/docs/transformers/en/kv_cache).

            Contains pre-computed hidden-states (key and values in the self-attention blocks and optionally if
            `config.is_encoder_decoder=True` in the cross-attention blocks) that can be used (see `past_key_values`
            input) to speed up sequential decoding.
    """

    last_hidden_state: torch.FloatTensor | None = None
    past_key_values: Cache | None = None
    hidden_states: tuple[torch.FloatTensor] | None = None
    attentions: tuple[torch.FloatTensor] | None = None
    width: torch.FloatTensor | None = None
    height: torch.FloatTensor | None = None
    image_embeds: torch.FloatTensor | None = None
    projection_attentions: tuple[torch.FloatTensor] | None = None
    vision_model_output: BaseModelOutputWithPooling = None

    def to_tuple(self) -> tuple[Any]:
        return tuple((self[k] if k != "vision_model_output" else getattr(self, k).to_tuple()) for k in self.keys())


@dataclass
class Kosmos2_5ForConditionalGenerationModelOutput(ModelOutput):
    """
    Model output class for `Kosmos2_5ForConditionalGeneration`.

    Args:
        loss (`torch.FloatTensor` of shape `(1,)`, *optional*, returned when `labels` is provided):
            Language modeling loss (for next-token prediction).
        logits (`torch.FloatTensor` of shape `(batch_size, sequence_length, config.vocab_size)`):
            Prediction scores of the language modeling head (scores for each vocabulary token before SoftMax).
        hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
            Tuple of `torch.FloatTensor` (one for the output of the embeddings, if the model has an embedding layer, +
            one for the output of each layer) of shape `(batch_size, sequence_length, hidden_size)`.

            Hidden-states of the model at the output of each layer plus the optional initial embedding outputs.
        attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`):
            Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
            sequence_length)`.

            Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
            heads.
        width (`torch.FloatTensor` of shape `(batch_size,)`):
            The original width (before resizing) of each image in the batch.
        height (`torch.FloatTensor` of shape `(batch_size,)`):
            The original height (before resizing) of each image in the batch.
        image_embeds (`torch.FloatTensor` of shape `(batch_size, latent_query_num, hidden_size)`, *optional*):
            Sequence of hidden-states at the output of `Kosmos2ImageToTextProjection`.
        projection_attentions (`tuple(torch.FloatTensor)`, *optional*):
            Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
            sequence_length)`.

            Attentions weights given by `Kosmos2ImageToTextProjection`, after the attention softmax, used to compute
            the weighted average in the self-attention heads.
        vision_model_output(`BaseModelOutputWithPooling`, *optional*):
            The output of the [`Kosmos2VisionModel`].
        past_key_values (`Cache`, *optional*, returned when `use_cache=True` is passed or when `config.use_cache=True`):
            It is a [`~cache_utils.Cache`] instance. For more details, see our [kv cache guide](https://huggingface.co/docs/transformers/en/kv_cache).

            Contains pre-computed hidden-states (key and values in the self-attention blocks and optionally if
            `config.is_encoder_decoder=True` in the cross-attention blocks) that can be used (see `past_key_values`
            input) to speed up sequential decoding.
    """

    loss: torch.FloatTensor | None = None
    logits: torch.FloatTensor | None = None
    past_key_values: Cache | None = None
    hidden_states: tuple[torch.FloatTensor] | None = None
    attentions: tuple[torch.FloatTensor] | None = None
    width: torch.FloatTensor | None = None
    height: torch.FloatTensor | None = None
    image_embeds: torch.FloatTensor | None = None
    projection_attentions: tuple[torch.FloatTensor] | None = None
    vision_model_output: BaseModelOutputWithPooling = None

    def to_tuple(self) -> tuple[Any]:
        return tuple((self[k] if k != "vision_model_output" else getattr(self, k).to_tuple()) for k in self.keys())


# Copied from transformers.models.pix2struct.modeling_pix2struct.Pix2StructLayerNorm with Pix2Struct->Kosmos2_5
class Kosmos2_5LayerNorm(nn.Module):
    def __init__(self, hidden_size, eps=1e-6):
        """
        Construct a layernorm module in the T5 style. No bias and no subtraction of mean.
        """
        super().__init__()
        self.weight = nn.Parameter(torch.ones(hidden_size))
        self.variance_epsilon = eps

    def forward(self, hidden_states):
        # T5 uses a layer_norm which only scales and doesn't shift, which is also known as Root Mean
        # Square Layer Normalization https://huggingface.co/papers/1910.07467 thus variance is calculated
        # w/o mean and there is no bias. Additionally we want to make sure that the accumulation for
        # half-precision inputs is done in fp32

        variance = hidden_states.to(torch.float32).pow(2).mean(-1, keepdim=True)
        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)

        # convert into half-precision if necessary
        if self.weight.dtype in [torch.float16, torch.bfloat16]:
            hidden_states = hidden_states.to(self.weight.dtype)

        return self.weight * hidden_states


# similar to transformers.models.pix2struct.modeling_pix2struct.Pix2StructVisionEmbeddings but with `inplace=False`
# TODO: check with krip
class Kosmos2_5VisionEmbeddings(nn.Module):
    def __init__(self, config: Kosmos2_5VisionConfig) -> None:
        super().__init__()
        self.config = config
        self.patch_projection = nn.Linear(config.patch_embed_hidden_size, config.hidden_size)

        self.row_embedder = nn.Embedding(config.max_num_patches, config.hidden_size)
        self.column_embedder = nn.Embedding(config.max_num_patches, config.hidden_size)

        self.dropout = nn.Dropout(config.dropout_rate, inplace=False)

    def forward(self, flattened_patches: torch.Tensor) -> torch.Tensor:
        # the row and column indices are stored in the first and second position of the flattened_patches
        # flattened_patches: `batch_size`, `seq_len`, `hidden_size` + 2
        row_indices = flattened_patches[:, :, 0].long()
        col_indices = flattened_patches[:, :, 1].long()

        flattened_patches = flattened_patches[:, :, 2:]

        embeddings = self.patch_projection(flattened_patches)
        row_embeddings = self.row_embedder(row_indices).to(embeddings.device)
        col_embeddings = self.column_embedder(col_indices).to(embeddings.device)

        # sum all embeddings together
        embeddings = embeddings + row_embeddings + col_embeddings

        embeddings = self.dropout(embeddings)

        return embeddings


# Copied from transformers.models.t5.modeling_t5.T5DenseGatedActDense with T5DenseGatedActDense->Pix2StructVisionMlp,T5Config->Pix2StructVisionConfig,config.d_model->config.hidden_size,dropout_rate->dropout_rate
class Kosmos2_5VisionMlp(nn.Module):
    def __init__(self, config: Kosmos2_5VisionConfig):
        super().__init__()
        self.wi_0 = nn.Linear(config.hidden_size, config.intermediate_size, bias=False)
        self.wi_1 = nn.Linear(config.hidden_size, config.intermediate_size, bias=False)
        self.wo = nn.Linear(config.intermediate_size, config.hidden_size, bias=False)
        self.dropout = nn.Dropout(config.dropout_rate)
        self.act = ACT2FN[config.dense_act_fn]

        # Ignore copy
        self.config = config

    def forward(self, hidden_states):
        hidden_gelu = self.act(self.wi_0(hidden_states))
        hidden_linear = self.wi_1(hidden_states)
        hidden_states = hidden_gelu * hidden_linear
        hidden_states = self.dropout(hidden_states)

        # To make 8bit quantization work for google/flan-t5-xxl, self.wo is kept in float32.
        # See https://github.com/huggingface/transformers/issues/20287
        # we also make sure the weights are not in `int8` in case users will force `_keep_in_fp32_modules` to be `None``
        if (
            isinstance(self.wo.weight, torch.Tensor)
            and hidden_states.dtype != self.wo.weight.dtype
            and self.wo.weight.dtype != torch.int8
        ):
            hidden_states = hidden_states.to(self.wo.weight.dtype)

        hidden_states = self.wo(hidden_states)
        return hidden_states


def eager_attention_forward(
    module: nn.Module,
    query: torch.Tensor,
    key: torch.Tensor,
    value: torch.Tensor,
    attention_mask: torch.Tensor | None,
    scaling: float,
    dropout: float = 0.0,
    **kwargs,
):
    # this weight maybe overflow with fp16
    attn_weights = torch.matmul(query, key.transpose(2, 3)) * scaling

    if attention_mask is not None:
        attn_weights = attn_weights + attention_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)
    attn_output = attn_output.transpose(1, 2).contiguous()

    return attn_output, attn_weights


class Kosmos2_5VisionAttention(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.hidden_size = config.hidden_size
        self.head_dim = config.head_dim
        self.n_heads = config.num_attention_heads
        self.dropout = config.attention_dropout
        self.inner_dim = self.n_heads * self.head_dim
        self.is_causal = False
        self.scaling = self.head_dim**-0.5

        self.query = nn.Linear(self.hidden_size, self.inner_dim, bias=False)
        self.key = nn.Linear(self.hidden_size, self.inner_dim, bias=False)
        self.value = nn.Linear(self.hidden_size, self.inner_dim, bias=False)
        self.output = nn.Linear(self.inner_dim, self.hidden_size, bias=False)

        self.gradient_checkpointing = False

    def forward(
        self,
        hidden_states,
        attention_mask=None,
        **kwargs: Unpack[TransformersKwargs],
    ):
        """
        Self-attention block
        """
        input_shape = hidden_states.shape[:-1]
        hidden_shape = (*input_shape, -1, self.head_dim)

        query_states = self.query(hidden_states).view(hidden_shape).transpose(1, 2)
        key_states = self.key(hidden_states).view(hidden_shape).transpose(1, 2)
        value_states = self.value(hidden_states).view(hidden_shape).transpose(1, 2)

        attention_interface: Callable = getattr(
            ALL_ATTENTION_FUNCTIONS, self.config._attn_implementation, eager_attention_forward
        )

        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(*input_shape, -1)
        attn_output = self.output(attn_output)

        return attn_output, attn_weights


class Kosmos2_5VisionLayer(GradientCheckpointingLayer):
    def __init__(self, config: Kosmos2_5VisionConfig) -> None:
        super().__init__()
        self.config = config

        self.attention = Kosmos2_5VisionAttention(config)
        self.mlp = Kosmos2_5VisionMlp(config)
        self.pre_mlp_layer_norm = Kosmos2_5LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.pre_attention_layer_norm = Kosmos2_5LayerNorm(config.hidden_size, eps=config.layer_norm_eps)

    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: torch.Tensor | None = None,
        output_attentions: bool = False,
        **kwargs: Unpack[TransformersKwargs],
    ) -> tuple[torch.Tensor, torch.Tensor] | tuple[torch.Tensor]:
        residual = hidden_states

        # in  Kosmos2_5Vision, layernorm is applied before self-attention
        hidden_states = self.pre_attention_layer_norm(hidden_states)

        attention_output, self_attn_weights = self.attention(
            hidden_states,
            attention_mask=attention_mask,
            output_attentions=output_attentions,
            **kwargs,
        )

        # first residual connection
        hidden_states = attention_output + residual

        # in  Kosmos2_5Vision, layernorm is also applied after self-attention
        layer_output = self.pre_mlp_layer_norm(hidden_states)
        layer_output = self.mlp(layer_output) + hidden_states  # second residual connection

        outputs = (layer_output,)
        if output_attentions:
            outputs += (self_attn_weights,)

        return outputs


# Adapted from transformers.models.pix2struct.modeling_pix2struct.Pix2StructVisionEncoder with Pix2Struct->Kosmos2_5
class Kosmos2_5VisionEncoder(nn.Module):
    def __init__(self, config: Kosmos2_5VisionConfig) -> None:
        super().__init__()
        self.config = config
        self.layer = nn.ModuleList([Kosmos2_5VisionLayer(config) for _ in range(config.num_hidden_layers)])
        self.gradient_checkpointing = False

    def _prepare_attention_mask(self, attention_mask, input_shape, inputs_embeds):
        if is_flash_attention_requested(self.config):
            if attention_mask is not None and 0.0 in attention_mask:
                return attention_mask
            return None
        if attention_mask is not None:
            # [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len]
            expanded_attn_mask = _expand_mask(attention_mask, inputs_embeds.dtype, tgt_len=input_shape[-1]).to(
                inputs_embeds.device
            )
        return expanded_attn_mask

    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: torch.Tensor | None = None,
        output_attentions: bool = False,
        output_hidden_states: bool = False,
        **kwargs: Unpack[TransformersKwargs],
    ) -> BaseModelOutput:
        all_hidden_states = () if output_hidden_states else None
        all_self_attentions = () if output_attentions else None

        attention_mask = self._prepare_attention_mask(attention_mask, hidden_states.shape[:2], hidden_states)

        for i, layer_module in enumerate(self.layer):
            if output_hidden_states:
                all_hidden_states = all_hidden_states + (hidden_states,)

            layer_outputs = layer_module(hidden_states, attention_mask, output_attentions, **kwargs)
            hidden_states = layer_outputs[0]

            if output_attentions:
                all_self_attentions = all_self_attentions + (layer_outputs[1],)

        if output_hidden_states:
            all_hidden_states = all_hidden_states + (hidden_states,)

        return BaseModelOutput(
            last_hidden_state=hidden_states,
            hidden_states=all_hidden_states,
            attentions=all_self_attentions,
        )


# Copied from transformers.models.kosmos2.modeling_kosmos2.Kosmos2TextSinusoidalPositionalEmbedding with Kosmos2->Kosmos2_5
class Kosmos2_5TextSinusoidalPositionalEmbedding(nn.Module):
    """This module produces sinusoidal positional embeddings of any length."""

    # Copied from transformers.models.m2m_100.modeling_m2m_100.M2M100SinusoidalPositionalEmbedding.__init__
    def __init__(self, num_positions: int, embedding_dim: int, padding_idx: int | None = None):
        super().__init__()
        self.offset = 2
        self.num_positions = num_positions
        self.embedding_dim = embedding_dim
        self.padding_idx = padding_idx
        self.make_weights(num_positions + self.offset, embedding_dim, padding_idx)

    # Copied from transformers.models.m2m_100.modeling_m2m_100.M2M100SinusoidalPositionalEmbedding.make_weights
    def make_weights(self, num_embeddings: int, embedding_dim: int, padding_idx: int | None = None):
        emb_weights = self.get_embedding(num_embeddings, embedding_dim, padding_idx)
        if hasattr(self, "weights"):
            # in forward put the weights on the correct dtype and device of the param
            emb_weights = emb_weights.to(dtype=self.weights.dtype, device=self.weights.device)

        self.register_buffer("weights", emb_weights, persistent=False)

    @staticmethod
    # Copied from transformers.models.m2m_100.modeling_m2m_100.M2M100SinusoidalPositionalEmbedding.get_embedding
    def get_embedding(num_embeddings: int, embedding_dim: int, padding_idx: int | None = None):
        """
        Build sinusoidal embeddings.

        This matches the implementation in tensor2tensor, but differs slightly from the description in Section 3.5 of
        "Attention Is All You Need".
        """
        half_dim = embedding_dim // 2
        emb = math.log(10000) / (half_dim - 1)
        emb = torch.exp(torch.arange(half_dim, dtype=torch.int64).float() * -emb)
        emb = torch.arange(num_embeddings, dtype=torch.int64).float().unsqueeze(1) * emb.unsqueeze(0)
        emb = torch.cat([torch.sin(emb), torch.cos(emb)], dim=1).view(num_embeddings, -1)
        if embedding_dim % 2 == 1:
            # zero pad
            emb = torch.cat([emb, torch.zeros(num_embeddings, 1)], dim=1)
        if padding_idx is not None:
            emb[padding_idx, :] = 0

        return emb.to(torch.get_default_dtype())

    @torch.no_grad()
    def forward(
        self,
        input_ids: torch.Tensor | None = None,
        inputs_embeds: torch.Tensor | None = None,
        past_key_values_length: int = 0,
        position_ids: torch.Tensor | None = None,
    ):
        if input_ids is not None:
            bsz, seq_len = input_ids.size()
            if position_ids is None:
                # Create the position ids from the input token ids. Any padded tokens remain padded.
                position_ids = self.create_position_ids_from_input_ids(
                    input_ids, self.padding_idx, past_key_values_length
                ).to(input_ids.device)
        else:
            bsz, seq_len = inputs_embeds.size()[:-1]
            if position_ids is None:
                position_ids = self.create_position_ids_from_inputs_embeds(
                    inputs_embeds, past_key_values_length, self.padding_idx
                )

        # expand embeddings if needed
        max_pos = self.padding_idx + 1 + seq_len + past_key_values_length
        if max_pos > self.weights.size(0):
            self.make_weights(max_pos + self.offset, self.embedding_dim, self.padding_idx)

        return self.weights.index_select(0, position_ids.view(-1)).view(bsz, seq_len, self.weights.shape[-1]).detach()

    @staticmethod
    # Copied from transformers.models.m2m_100.modeling_m2m_100.M2M100SinusoidalPositionalEmbedding.create_position_ids_from_inputs_embeds
    def create_position_ids_from_inputs_embeds(inputs_embeds, past_key_values_length, padding_idx):
        """
        We are provided embeddings directly. We cannot infer which are padded so just generate sequential position ids.

        Args:
            inputs_embeds: torch.Tensor

        Returns: torch.Tensor
        """
        input_shape = inputs_embeds.size()[:-1]
        sequence_length = input_shape[1]

        position_ids = torch.arange(
            padding_idx + 1, sequence_length + padding_idx + 1, dtype=torch.long, device=inputs_embeds.device
        )
        return position_ids.unsqueeze(0).expand(input_shape).contiguous() + past_key_values_length

    @staticmethod
    # Copied from transformers.models.roberta.modeling_roberta.RobertaEmbeddings.create_position_ids_from_input_ids
    def create_position_ids_from_input_ids(input_ids, padding_idx, past_key_values_length=0):
        """
        Replace non-padding symbols with their position numbers. Position numbers begin at padding_idx+1. Padding symbols
        are ignored. This is modified from fairseq's `utils.make_positions`.

        Args:
            x: torch.Tensor x:

        Returns: torch.Tensor
        """
        # The series of casts and type-conversions here are carefully balanced to both work with ONNX export and XLA.
        mask = input_ids.ne(padding_idx).int()
        incremental_indices = (torch.cumsum(mask, dim=1).type_as(mask) + past_key_values_length) * mask
        return incremental_indices.long() + padding_idx


# Copied from transformers.models.kosmos2.modeling_kosmos2.Kosmos2TextFFN with Kosmos2->Kosmos2_5
class Kosmos2_5TextFFN(nn.Module):
    def __init__(self, config: Kosmos2_5TextConfig):
        super().__init__()

        self.dropout = config.dropout
        self.activation_fn = ACT2FN[config.activation_function]
        self.activation_dropout = config.activation_dropout

        self.fc1 = nn.Linear(config.embed_dim, config.ffn_dim)
        self.fc2 = nn.Linear(config.ffn_dim, config.embed_dim)

        self.ffn_layernorm = nn.LayerNorm(config.ffn_dim, eps=config.layer_norm_eps)

    def forward(self, hidden_states):
        hidden_states = self.activation_fn(self.fc1(hidden_states))
        hidden_states = nn.functional.dropout(hidden_states, p=self.activation_dropout, training=self.training)
        hidden_states = self.ffn_layernorm(hidden_states)
        hidden_states = self.fc2(hidden_states)
        hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training)

        return hidden_states


class Kosmos2_5TextAttention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(
        self,
        config,
        embed_dim: int,
        num_heads: int,
        dropout: float = 0.0,
        is_decoder: bool = False,
        bias: bool = True,
        is_causal=True,
        layer_idx: int | None = None,
    ):
        super().__init__()
        self.config = config
        self.layer_idx = layer_idx
        self.embed_dim = embed_dim
        self.num_heads = num_heads
        self.dropout = dropout
        self.head_dim = embed_dim // num_heads

        if (self.head_dim * num_heads) != self.embed_dim:
            raise ValueError(
                f"embed_dim must be divisible by num_heads (got `embed_dim`: {self.embed_dim}"
                f" and `num_heads`: {num_heads})."
            )
        self.scaling = self.head_dim**-0.5
        self.is_decoder = is_decoder

        self.k_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
        self.v_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
        self.q_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
        self.out_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
        self.is_causal = is_causal

    def forward(
        self,
        hidden_states: torch.Tensor,  # text part
        encoder_hidden_states: torch.Tensor | None = None,  # image part
        attention_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        cache_position: torch.LongTensor | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> tuple[torch.Tensor, torch.Tensor | None, tuple[torch.Tensor] | None]:
        input_shape = hidden_states.shape[:-1]
        hidden_shape = (*input_shape, -1, self.head_dim)

        # use encoder_hidden_states if cross attention
        is_cross_attention = encoder_hidden_states is not None
        current_states = encoder_hidden_states if is_cross_attention else hidden_states

        current_input_shape = current_states.shape[:-1]
        current_hidden_shape = (*current_input_shape, -1, self.head_dim)

        key_states = self.k_proj(current_states).view(current_hidden_shape).transpose(1, 2)
        value_states = self.v_proj(current_states).view(current_hidden_shape).transpose(1, 2)
        query_states = self.q_proj(hidden_states).view(hidden_shape).transpose(1, 2)

        # Apply `self.scaling`
        query_states = self.scaling * query_states

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

        attention_interface: Callable = ALL_ATTENTION_FUNCTIONS.get_interface(
            self.config._attn_implementation, eager_attention_forward
        )

        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=1.0,  # We don't use `self.scaling` as it's already applied to `query_states` above .
            **kwargs,
        )

        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
        attn_output = self.out_proj(attn_output)
        return attn_output, attn_weights


class Kosmos2_5TextBlock(GradientCheckpointingLayer):
    def __init__(self, config: Kosmos2_5TextConfig, layer_idx: int):
        super().__init__()
        self.embed_dim = config.embed_dim
        self.layer_idx = layer_idx
        self.self_attn = Kosmos2_5TextAttention(
            config,
            embed_dim=self.embed_dim,
            num_heads=config.attention_heads,
            dropout=config.attention_dropout,
            is_decoder=True,
            is_causal=True,
            layer_idx=layer_idx,
        )
        self.dropout = config.dropout
        self.self_attn_layer_norm = nn.LayerNorm(self.embed_dim, eps=config.layer_norm_eps)
        self.ffn = Kosmos2_5TextFFN(config)
        self.final_layer_norm = nn.LayerNorm(self.embed_dim, eps=config.layer_norm_eps)

    # Adapted from transformers.models.kosmos2.modeling_kosmos2.Kosmos2TextBlock.forward
    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        output_attentions: bool | None = False,
        use_cache: bool | None = True,
        cache_position: torch.LongTensor | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> tuple[torch.FloatTensor, tuple[torch.FloatTensor, torch.FloatTensor] | None]:
        residual = hidden_states

        hidden_states = self.self_attn_layer_norm(hidden_states)

        # Self Attention
        hidden_states, self_attn_weights = self.self_attn(
            hidden_states=hidden_states,
            attention_mask=attention_mask,
            past_key_values=past_key_values,
            output_attentions=output_attentions,
            use_cache=use_cache,
            cache_position=cache_position,
            **kwargs,
        )
        hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training)
        hidden_states = residual + hidden_states

        # Fully Connected
        residual = hidden_states
        hidden_states = self.final_layer_norm(hidden_states)
        hidden_states = self.ffn(hidden_states)
        hidden_states = residual + hidden_states

        outputs = (hidden_states,)
        if output_attentions:
            outputs += (self_attn_weights,)

        return outputs


# Adapted from transformers.models.kosmos2.modeling_kosmos2.Kosmos2TextTransformer with Kosmos2->Kosmos2_5
class Kosmos2_5TextTransformer(nn.Module):
    """
    Transformer decoder consisting of `config.layers` layers. Each layer is a [`Kosmos2_5TextBlock`].
    Here we doesn't have cross attention.
    Args:
        config: Kosmos2_5TextConfig
    """

    def __init__(self, config: Kosmos2_5TextConfig):
        super().__init__()
        self.config = config
        self.dropout = config.dropout
        self.layerdrop = config.layerdrop

        self.embed_scale = math.sqrt(config.embed_dim) if config.scale_embedding else 1.0
        self.embed_tokens = nn.Embedding(config.vocab_size, config.embed_dim, padding_idx=config.pad_token_id)

        self.embed_positions = Kosmos2_5TextSinusoidalPositionalEmbedding(
            num_positions=config.max_position_embeddings,
            embedding_dim=config.embed_dim,
            padding_idx=config.pad_token_id,
        )

        # Ignore copy
        self.segment_emb = nn.Embedding(2, config.embed_dim)
        self.layers = nn.ModuleList([Kosmos2_5TextBlock(config, layer_idx) for layer_idx in range(config.layers)])
        self.layer_norm = nn.LayerNorm(config.embed_dim, config.layer_norm_eps)
        self.gradient_checkpointing = False

    def forward(
        self,
        input_ids: torch.Tensor | None = None,
        attention_mask: torch.Tensor | None = None,
        image_embeds: torch.Tensor | None = None,
        image_embeds_position_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        inputs_embeds: torch.Tensor | None = None,
        position_ids: torch.Tensor | None = None,
        use_cache: bool | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        cache_position: torch.LongTensor | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> BaseModelOutputWithPastAndCrossAttentions:
        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )
        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 cannot specify both input_ids and inputs_embeds at the same time, and must specify either one"
            )

        if self.gradient_checkpointing and self.training and use_cache:
            logger.warning_once(
                "`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`."
            )
            use_cache = False

        # The argument `inputs_embeds` should be the one without being multiplied by `self.embed_scale`.
        if inputs_embeds is None:
            inputs_embeds = self.embed_tokens(input_ids)

        # Ignore copy
        if image_embeds is not None:
            inputs_embeds = inputs_embeds.clone()
            inputs_embeds[image_embeds_position_mask == 1] = image_embeds.to(inputs_embeds.device).view(
                -1, image_embeds.shape[-1]
            )

        inputs_embeds = inputs_embeds * self.embed_scale

        # embed positions
        positions = self.embed_positions(
            input_ids=input_ids,
            inputs_embeds=inputs_embeds,
            past_key_values_length=0,
            position_ids=position_ids,
        )
        positions = positions.to(inputs_embeds.device)

        # Ignore copy
        if image_embeds_position_mask is not None:
            # make every not equal 0 be 1
            image_embeds_position_mask = image_embeds_position_mask.ne(0).long()
            segment_embeds = self.segment_emb(image_embeds_position_mask).to(positions.device)
            positions += segment_embeds
        else:
            # add zero embedding for padding tokens
            bsz, seq_len, dim = positions.size()
            zero_emb = self.segment_emb(
                torch.zeros((bsz, 1), dtype=torch.long, device=self.segment_emb.weight.device)
            ).to(positions.device)
            positions += zero_emb

        hidden_states = inputs_embeds + positions

        hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training)

        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
            )

        causal_mask = create_causal_mask(
            config=self.config,
            inputs_embeds=inputs_embeds,
            attention_mask=attention_mask,
            cache_position=cache_position,
            past_key_values=past_key_values,
        )

        hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training)

        # decoder layers
        all_hidden_states = () if output_hidden_states else None
        all_self_attns = () if output_attentions else None

        for decoder_layer in self.layers:
            if output_hidden_states:
                all_hidden_states += (hidden_states,)

            layer_outputs = decoder_layer(
                hidden_states,
                attention_mask=causal_mask,
                past_key_values=past_key_values,
                output_attentions=output_attentions,
                use_cache=use_cache,
                cache_position=cache_position,
                **kwargs,
            )
            hidden_states = layer_outputs[0]

            if output_attentions:
                all_self_attns += (layer_outputs[1],)

        # add final layer norm
        hidden_states = self.layer_norm(hidden_states)

        # add hidden states from the last decoder layer
        if output_hidden_states:
            all_hidden_states += (hidden_states,)

        output = BaseModelOutputWithPast(
            last_hidden_state=hidden_states,
            past_key_values=past_key_values if use_cache else None,
            hidden_states=all_hidden_states,
            attentions=all_self_attns,
        )
        return output


class Kosmos2_5ImageToTextProjection(nn.Module):
    """The layer that transforms the image model's output to part of the text model's input (namely, image features)"""

    def __init__(self, config: Kosmos2_5Config):
        super().__init__()
        self.dense = nn.Linear(config.vision_config.hidden_size, config.text_config.embed_dim)
        self.latent_query = nn.Parameter(torch.randn(config.latent_query_num, config.text_config.embed_dim))

        # Ignore copy
        self.x_attn = Kosmos2_5TextAttention(
            config.text_config,
            config.text_config.embed_dim,
            config.text_config.attention_heads,
            dropout=config.text_config.attention_dropout,
            is_decoder=False,
            is_causal=False,
        )

    def forward(self, features):
        hidden_states = self.dense(features)

        # shape = [batch, latent_query_num, h_dim]
        latent_query = self.latent_query.unsqueeze(0).expand(hidden_states.size(0), -1, -1)
        key_value_states = torch.cat([hidden_states, latent_query], dim=1)

        hidden_states, attn_weights = self.x_attn(
            hidden_states=latent_query,
            encoder_hidden_states=key_value_states,
            past_key_values=None,
            attention_mask=None,
            output_attentions=None,
            is_causal=False,
        )

        return hidden_states, attn_weights


class Kosmos2_5PreTrainedModel(PreTrainedModel):
    """
    An abstract class to handle weights initialization and a simple interface for downloading and loading pretrained
    models.
    """

    config_class = Kosmos2_5Config
    input_modalities = ("image", "text")
    supports_gradient_checkpointing = True
    _no_split_modules = ["Kosmos2_5VisionLayer", "Kosmos2_5TextBlock"]
    _supports_flash_attn = True
    _supports_cache_class = True
    _supports_sdpa = True
    _supports_attention_backend = True

    @torch.no_grad()
    def _init_weights(self, module):
        """Initialize the weights"""
        if isinstance(self, Kosmos2_5VisionModel):
            init_factor = self.config.initializer_factor
            std = self.config.initializer_range * init_factor
        elif isinstance(self, (Kosmos2_5TextModel, Kosmos2_5TextForCausalLM)):
            std = self.config.init_std
        elif isinstance(self, (Kosmos2_5Model, Kosmos2_5ForConditionalGeneration)):
            std = self.config.text_config.init_std
        if isinstance(module, nn.Linear):
            init.normal_(module.weight, mean=0.0, std=std)
            if module.bias is not None:
                init.zeros_(module.bias)
        elif isinstance(module, nn.Embedding):
            init.normal_(module.weight, mean=0.0, std=std)
            # Here we need the check explicitly, as we slice the weight in the `zeros_` call, so it looses the flag
            if module.padding_idx is not None and not getattr(module.weight, "_is_hf_initialized", False):
                init.zeros_(module.weight[module.padding_idx])
        elif isinstance(module, (nn.LayerNorm, Kosmos2_5LayerNorm)):
            init.ones_(module.weight)
            if getattr(module, "bias", None) is not None:
                init.zeros_(module.bias)
        elif isinstance(module, Kosmos2_5ImageToTextProjection):
            init.normal_(module.latent_query, mean=0.0, std=1.0)
        elif isinstance(module, Kosmos2_5TextSinusoidalPositionalEmbedding):
            emb_weights = module.get_embedding(
                module.num_positions + module.offset, module.embedding_dim, module.padding_idx
            )
            init.copy_(module.weights, emb_weights)


class Kosmos2_5VisionModel(Kosmos2_5PreTrainedModel):
    config_class = Kosmos2_5VisionConfig
    input_modalities = ("text",)

    # Copied from transformers.models.pix2struct.modeling_pix2struct.Pix2StructVisionModel.__init__ with Pix2Struct->Kosmos2_5
    def __init__(self, config: Kosmos2_5VisionConfig):
        super().__init__(config)
        self.config = config

        self.embeddings = Kosmos2_5VisionEmbeddings(config)
        self.encoder = Kosmos2_5VisionEncoder(config)

        self.layernorm = Kosmos2_5LayerNorm(config.hidden_size, eps=config.layer_norm_eps)

        # Initialize weights and apply final processing
        self.post_init()

    # Copied from transformers.models.pix2struct.modeling_pix2struct.Pix2StructVisionModel.get_input_embeddings
    def get_input_embeddings(self):
        return self.embeddings.patch_projection

    # Similar to transformers.models.pix2struct.modeling_pix2struct.Pix2StructVisionModel.forward without docstring
    def forward(
        self,
        flattened_patches: torch.Tensor | None = None,
        attention_mask: torch.Tensor | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> BaseModelOutputWithPooling:
        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )

        if flattened_patches is None:
            raise ValueError("You have to specify flattened_patches")

        if attention_mask is None:
            # check where `flattened_patches` is not 0
            attention_mask = (flattened_patches.sum(dim=-1) != 0).float()

        embedding_output = self.embeddings(flattened_patches)

        encoder_outputs = self.encoder(
            embedding_output,
            attention_mask=attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            **kwargs,
        )
        sequence_output = encoder_outputs.last_hidden_state
        sequence_output = self.layernorm(sequence_output)

        return BaseModelOutput(
            last_hidden_state=sequence_output,
            hidden_states=encoder_outputs.hidden_states,
            attentions=encoder_outputs.attentions,
        )


# Adapted from transformers.models.kosmos2.modeling_kosmos2.Kosmos2TextModel with KOSMOS2->KOSMOS2_5
class Kosmos2_5TextModel(Kosmos2_5PreTrainedModel):
    config_class = Kosmos2_5TextConfig
    input_modalities = ("text",)

    def __init__(self, config: Kosmos2_5TextConfig):
        super().__init__(config)
        self.model = Kosmos2_5TextTransformer(config)
        # Initialize weights and apply final processing
        self.post_init()

    def get_input_embeddings(self) -> nn.Module:
        return self.model.embed_tokens

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

    @add_start_docstrings_to_model_forward(KOSMOS2_5_TEXT_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=BaseModelOutputWithPastAndCrossAttentions, config_class=Kosmos2_5TextConfig)
    def forward(
        self,
        input_ids: torch.Tensor | None = None,
        attention_mask: torch.Tensor | None = None,
        image_embeds: torch.Tensor | None = None,
        image_embeds_position_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        inputs_embeds: torch.Tensor | None = None,
        position_ids: torch.Tensor | None = None,
        use_cache: bool | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        cache_position: torch.LongTensor | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> BaseModelOutputWithPastAndCrossAttentions:
        r"""
        Returns:

        """
        return self.model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            image_embeds=image_embeds,
            image_embeds_position_mask=image_embeds_position_mask,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            position_ids=position_ids,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            cache_position=cache_position,
            **kwargs,
        )


@add_start_docstrings(
    """
    KOSMOS-2.5 Model for generating text and image features. The model consists of a vision encoder and a language model.
    """,
    KOSMOS2_5_START_DOCSTRING,
)
class Kosmos2_5Model(Kosmos2_5PreTrainedModel):
    config_class = Kosmos2_5Config

    def __init__(self, config: Kosmos2_5Config):
        super().__init__(config)

        self.text_model = Kosmos2_5TextModel._from_config(config.text_config)
        self.vision_model = Kosmos2_5VisionModel._from_config(config.vision_config)
        self.image_to_text_projection = Kosmos2_5ImageToTextProjection(config)

        # Initialize weights and apply final processing
        self.post_init()

    def get_input_embeddings(self) -> nn.Module:
        return self.text_model.model.embed_tokens

    def set_input_embeddings(self, value):
        self.text_model.model.embed_tokens = value

    @can_return_tuple
    @add_start_docstrings_to_model_forward(KOSMOS2_5_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=Kosmos2_5ModelOutput, config_class=_CONFIG_FOR_DOC)
    def forward(
        self,
        input_ids: torch.Tensor | None = None,
        flattened_patches: torch.Tensor | None = None,
        width: torch.Tensor | None = None,
        height: torch.Tensor | None = None,
        image_embeds_position_mask: torch.Tensor | None = None,
        attention_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        image_embeds: torch.Tensor | None = None,
        inputs_embeds: torch.Tensor | None = None,
        position_ids: torch.Tensor | None = None,
        use_cache: bool | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        cache_position: torch.LongTensor | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> Kosmos2_5ModelOutput:
        r"""
        Returns:

        Examples:

        ```python
        >>> from PIL import Image
        >>> import httpx
        >>> from io import BytesIO
        >>> from transformers import AutoProcessor, Kosmos2_5Model

        >>> model = Kosmos2_5Model.from_pretrained("microsoft/kosmos2.5")
        >>> processor = AutoProcessor.from_pretrained("microsoft/kosmos2.5")

        >>> url = "https://huggingface.co/microsoft/kosmos2.5/resolve/main/snowman.jpg"
        >>> with httpx.stream("GET", url) as response:
        ...     image = Image.open(BytesIO(response.read()))

        >>> text = (
        ...     "<grounding> An image of<phrase> a snowman</phrase><object><patch_index_0044><patch_index_0863>"
        ...     "</object> warming himself by<phrase> a fire</phrase><object><patch_index_0005><patch_index_0911>"
        ...     "</object>"
        ... )

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

        >>> last_hidden_state = model(
        ...     pixel_values=inputs["pixel_values"],
        ...     input_ids=inputs["input_ids"],
        ...     attention_mask=inputs["attention_mask"],
        ...     image_embeds_position_mask=inputs["image_embeds_position_mask"],
        ... ).last_hidden_state
        >>> list(last_hidden_state.shape)
        [1, 91, 2048]
        ```"""
        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )

        vision_model_output = None
        projection_attentions = None
        if image_embeds is None:
            if flattened_patches is not None:
                vision_model_output = self.vision_model(
                    flattened_patches=flattened_patches,
                    output_attentions=output_attentions,
                    output_hidden_states=output_hidden_states,
                    **kwargs,
                )
                # normalized features
                image_embeds = nn.functional.normalize(vision_model_output.last_hidden_state, dim=-1)
                image_embeds, projection_attentions = self.image_to_text_projection(image_embeds)

        outputs = self.text_model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            image_embeds=image_embeds,
            image_embeds_position_mask=image_embeds_position_mask,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            position_ids=position_ids,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            cache_position=cache_position,
            **kwargs,
        )

        return Kosmos2_5ModelOutput(
            last_hidden_state=outputs.last_hidden_state,
            past_key_values=outputs.past_key_values,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
            width=width,
            height=height,
            image_embeds=image_embeds,
            projection_attentions=projection_attentions,
            vision_model_output=vision_model_output,
        )


@add_start_docstrings(
    """
    The text model from KOSMOS-2.5 with a language modeling head on top (linear layer with weights tied to the input
    embeddings).
    """,
    KOSMOS2_5_START_DOCSTRING,
)
class Kosmos2_5TextForCausalLM(Kosmos2_5PreTrainedModel, GenerationMixin):
    config_class = Kosmos2_5TextConfig
    input_modalities = ("text",)
    _tied_weights_keys = {"lm_head.weight": "model.embed_tokens.weight"}

    def __init__(self, config: Kosmos2_5TextConfig):
        super().__init__(config)

        self.model = Kosmos2_5TextTransformer(config)
        self.lm_head = nn.Linear(in_features=config.embed_dim, out_features=config.vocab_size, bias=False)

        # Initialize weights and apply final processing
        self.post_init()

    def get_input_embeddings(self) -> nn.Module:
        return self.model.embed_tokens

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

    def get_output_embeddings(self) -> nn.Module:
        return self.lm_head

    def set_output_embeddings(self, new_embeddings):
        self.lm_head = new_embeddings

    @add_start_docstrings_to_model_forward(KOSMOS2_5_TEXT_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=CausalLMOutputWithCrossAttentions, config_class=Kosmos2_5TextConfig)
    def forward(
        self,
        input_ids: torch.Tensor | None = None,
        attention_mask: torch.Tensor | None = None,
        image_embeds: torch.Tensor | None = None,
        image_embeds_position_mask: torch.Tensor | None = None,
        position_ids: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        inputs_embeds: torch.Tensor | None = None,
        labels: torch.LongTensor | None = None,
        use_cache: bool | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        logits_to_keep: int | torch.Tensor = 0,
        **kwargs: Unpack[TransformersKwargs],
    ) -> CausalLMOutputWithCrossAttentions:
        r"""
        labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Labels for computing the left-to-right language modeling loss (next word prediction). Indices should be in
            `[-100, 0, ..., config.vocab_size]` (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]`

        Returns:

        """
        if labels is not None:
            if use_cache:
                logger.warning("The `use_cache` argument is changed to `False` since `labels` is provided.")
            use_cache = False

        outputs: BaseModelOutputWithPastAndCrossAttentions = self.model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            image_embeds=image_embeds,
            image_embeds_position_mask=image_embeds_position_mask,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            position_ids=position_ids,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            **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=logits, labels=labels, vocab_size=self.config.vocab_size, **kwargs)

        return CausalLMOutputWithCrossAttentions(
            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,
        inputs_embeds=None,
        image_embeds=None,
        image_embeds_position_mask=None,
        past_key_values=None,
        attention_mask=None,
        use_cache=None,
        cache_position=None,
        position_ids=None,
        is_first_iteration=False,
        **model_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,
            inputs_embeds=inputs_embeds,
            image_embeds=image_embeds,
            image_embeds_position_mask=image_embeds_position_mask,
            past_key_values=past_key_values,
            attention_mask=attention_mask,
            use_cache=use_cache,
            cache_position=cache_position,
            position_ids=position_ids,
            is_first_iteration=is_first_iteration,
            **model_kwargs,
        )

        # Pixel values are used only in the first iteration if available
        # In subsequent iterations, they are already cached
        if past_key_values is not None and past_key_values.get_seq_length() > 0:
            model_inputs["image_embeds"] = None
            model_inputs["image_embeds_position_mask"] = None

            # Kosmos2.5 starts position_ids at `pad_token_id`...
            if model_inputs.get("position_ids") is not None:
                # NOTE: we need this op out-of-place, otherwise it modifies the `model_kwargs` dict used in `generate` in-place!
                model_inputs["position_ids"] = model_inputs["position_ids"] + 1 + self.config.pad_token_id

        # appending `False` to `image_embeds_position_mask` (because `input_ids` grows during generation)
        elif image_embeds_position_mask is not None:
            batch_size, seq_len = inputs_embeds.size()[:-1] if inputs_embeds is not None else input_ids.size()
            mask_len = image_embeds_position_mask.size()[-1]
            model_inputs["image_embeds_position_mask"] = torch.cat(
                (
                    image_embeds_position_mask,
                    torch.zeros(size=(batch_size, seq_len - mask_len), dtype=torch.bool, device=input_ids.device),
                ),
                dim=1,
            )
            # Kosmos2.5 has offset for position ids, so we need to create them correctly in PositionEmbedding layer
            model_inputs.pop("position_ids", None)

        return model_inputs


@add_start_docstrings(
    """
    KOSMOS-2.5 Model for generating text and bounding boxes given an image. The model consists of a vision encoder and a
    language model.
    """,
    KOSMOS2_5_START_DOCSTRING,
)
class Kosmos2_5ForConditionalGeneration(Kosmos2_5PreTrainedModel, GenerationMixin):
    config_class = Kosmos2_5Config

    def __init__(self, config: Kosmos2_5Config):
        super().__init__(config)
        self.text_model = Kosmos2_5TextForCausalLM(config.text_config)
        self.vision_model = Kosmos2_5VisionModel(config.vision_config)
        self.image_to_text_projection = Kosmos2_5ImageToTextProjection(config)
        # Initialize weights and apply final processing
        self.post_init()

    def get_input_embeddings(self) -> nn.Module:
        return self.text_model.model.embed_tokens

    def set_input_embeddings(self, value):
        self.text_model.model.embed_tokens = value

    def get_output_embeddings(self) -> nn.Module:
        return self.text_model.get_output_embeddings()

    def set_output_embeddings(self, new_embeddings):
        self.text_model.set_output_embeddings(new_embeddings)

    @can_return_tuple
    @add_start_docstrings_to_model_forward(KOSMOS2_5_INPUTS_DOCSTRING)
    @replace_return_docstrings(
        output_type=Kosmos2_5ForConditionalGenerationModelOutput,
        config_class=_CONFIG_FOR_DOC,
    )
    def forward(
        self,
        input_ids: torch.Tensor | None = None,
        flattened_patches: torch.Tensor | None = None,
        width: torch.Tensor | None = None,
        height: torch.Tensor | None = None,
        image_embeds_position_mask: torch.Tensor | None = None,
        attention_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        image_embeds: torch.Tensor | None = None,
        inputs_embeds: torch.Tensor | None = None,
        position_ids: torch.Tensor | None = None,
        labels: torch.LongTensor | None = None,
        use_cache: bool | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        logits_to_keep: int | torch.Tensor = 0,
        **kwargs: Unpack[TransformersKwargs],
    ) -> Kosmos2_5ForConditionalGenerationModelOutput:
        r"""
        labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Labels for computing the left-to-right language modeling loss (next word prediction). Indices should be in
            `[-100, 0, ..., config.vocab_size]` (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]`

        Returns:

        Examples:

        ```python
        >>> from PIL import Image
        >>> import httpx
        >>> from io import BytesIO
        >>> import torch
        >>> from transformers import AutoProcessor, Kosmos2_5ForConditionalGeneration

        >>> repo = "microsoft/kosmos-2.5"
        >>> device = "cuda:0"
        >>> dtype = torch.bfloat16 # torch.float16
        >>> model = Kosmos2_5ForConditionalGeneration.from_pretrained(repo, device_map=device, dtype=dtype)
        >>> processor = AutoProcessor.from_pretrained(repo)

        >>> url = "https://huggingface.co/microsoft/kosmos-2.5/resolve/main/receipt_00008.png"

        >>> with httpx.stream("GET", url) as response:
        ...     image = Image.open(BytesIO(response.read()))

        >>> prompt = "<ocr>" # <md>

        >>> inputs = processor(text=prompt, images=image, return_tensors="pt")
        >>> height, width = inputs.pop("height"), inputs.pop("width")
        >>> inputs = {k: v.to(device) if v is not None else None for k, v in inputs.items()}
        >>> inputs["flattened_patches"] = inputs["flattened_patches"].to(dtype)

        >>> generated_ids = model.generate(**inputs,max_new_tokens=1024)
        >>> generated_text = processor.batch_decode(generated_ids, skip_special_tokens=True)[0]
        >>> generated_text
        '<ocr><bbox><x_53><y_573><x_69><y_606></bbox>1\n<bbox><x_79><y_573><x_464><y_612></bbox>[REG] BLACK SAKURA\n<bbox><x_690><y_569><x_810><y_606></bbox>45,455\n<bbox><x_53><y_614><x_69><y_648></bbox>1\n<bbox><x_79><y_614><x_468><y_650></bbox>COOKIE DOH SAUCES\n<bbox><x_788><y_609><x_812><y_644></bbox>0\n<bbox><x_50><y_658><x_69><y_693></bbox>1\n<bbox><x_79><y_658><x_358><y_693></bbox>NATA DE COCO\n<bbox><x_790><y_652><x_814><y_687></bbox>0\n<bbox><x_31><y_742><x_820><y_781></bbox>Sub Total 45,455\n<bbox><x_27><y_781><x_822><y_827></bbox>PB1 (10%) 4,545\n<bbox><x_27><y_826><x_824><y_872></bbox>Rounding 0\n<bbox><x_24><y_872><x_827><y_921></bbox>Total 50,000\n<bbox><x_17><y_1056><x_836><y_1108></bbox>Card Payment 50,000\n'
        ```"""
        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )

        vision_model_output = None
        projection_attentions = None

        if image_embeds is None:
            if flattened_patches is not None:
                vision_model_output = self.vision_model(
                    flattened_patches=flattened_patches,
                    output_attentions=output_attentions,
                    output_hidden_states=output_hidden_states,
                    **kwargs,
                )
                image_embeds = nn.functional.normalize(vision_model_output.last_hidden_state, dim=-1)
                image_embeds, projection_attentions = self.image_to_text_projection(image_embeds)

        lm_outputs: CausalLMOutputWithCrossAttentions = self.text_model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            image_embeds=image_embeds,
            image_embeds_position_mask=image_embeds_position_mask,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            position_ids=position_ids,
            labels=labels,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            logits_to_keep=logits_to_keep,
            **kwargs,
        )

        return Kosmos2_5ForConditionalGenerationModelOutput(
            loss=lm_outputs.loss,
            logits=lm_outputs.logits,
            past_key_values=lm_outputs.past_key_values,
            hidden_states=lm_outputs.hidden_states,
            attentions=lm_outputs.attentions,
            width=width,
            height=height,
            image_embeds=image_embeds,
            projection_attentions=projection_attentions,
            vision_model_output=vision_model_output,
        )

    def prepare_inputs_for_generation(
        self,
        input_ids,
        flattened_patches=None,
        image_embeds=None,
        image_embeds_position_mask=None,
        past_key_values=None,
        attention_mask=None,
        use_cache=None,
        cache_position=None,
        position_ids=None,
        is_first_iteration=False,
        **model_kwargs,
    ):
        # Overwritten -- in specific circumstances we don't want to forward image inputs to the model

        model_inputs = self.text_model.prepare_inputs_for_generation(
            input_ids,
            image_embeds=image_embeds,
            image_embeds_position_mask=image_embeds_position_mask,
            past_key_values=past_key_values,
            attention_mask=attention_mask,
            use_cache=use_cache,
            cache_position=cache_position,
            position_ids=position_ids,
            is_first_iteration=is_first_iteration,
            **model_kwargs,
        )

        if is_first_iteration or not use_cache:
            # If we're in cached decoding stage, `flattened_patches` should be `None` because `input_ids` do not contain special image token anymore
            # Otherwise we need `flattened_patches` to be passed to model
            model_inputs["flattened_patches"] = flattened_patches

        return model_inputs


__all__ = [
    "Kosmos2_5ForConditionalGeneration",
    "Kosmos2_5Model",
    "Kosmos2_5PreTrainedModel",
]
