# coding=utf-8
# Copyright 2023-present NAVER Corp, The Microsoft Research Asia LayoutLM Team Authors and the HuggingFace Inc. team.
#
# 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.
# See the License for the specific language governing permissions and
# limitations under the License.
"""PyTorch Bros model."""

import math
from dataclasses import dataclass
from typing import Optional, Union

import torch
from torch import nn
from torch.nn import CrossEntropyLoss

from ...activations import ACT2FN
from ...modeling_layers import GradientCheckpointingLayer
from ...modeling_outputs import (
    BaseModelOutputWithCrossAttentions,
    BaseModelOutputWithPoolingAndCrossAttentions,
    TokenClassifierOutput,
)
from ...modeling_utils import PreTrainedModel
from ...pytorch_utils import apply_chunking_to_forward, find_pruneable_heads_and_indices, prune_linear_layer
from ...utils import ModelOutput, auto_docstring, can_return_tuple, logging
from .configuration_bros import BrosConfig


logger = logging.get_logger(__name__)


@dataclass
@auto_docstring(
    custom_intro="""
    Base class for outputs of token classification models.
    """
)
class BrosSpadeOutput(ModelOutput):
    r"""
    loss (`torch.FloatTensor` of shape `(1,)`, *optional*, returned when `labels` is provided):
        Classification loss.
    initial_token_logits (`torch.FloatTensor` of shape `(batch_size, sequence_length, config.num_labels)`):
        Classification scores for entity initial tokens (before SoftMax).
    subsequent_token_logits (`torch.FloatTensor` of shape `(batch_size, sequence_length, sequence_length+1)`):
        Classification scores for entity sequence tokens (before SoftMax).
    """

    loss: Optional[torch.FloatTensor] = None
    initial_token_logits: Optional[torch.FloatTensor] = None
    subsequent_token_logits: Optional[torch.FloatTensor] = None
    hidden_states: Optional[tuple[torch.FloatTensor]] = None
    attentions: Optional[tuple[torch.FloatTensor]] = None


class BrosPositionalEmbedding1D(nn.Module):
    # Reference: https://github.com/kimiyoung/transformer-xl/blob/master/pytorch/mem_transformer.py#L15

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

        self.dim_bbox_sinusoid_emb_1d = config.dim_bbox_sinusoid_emb_1d

        inv_freq = 1 / (
            10000 ** (torch.arange(0.0, self.dim_bbox_sinusoid_emb_1d, 2.0) / self.dim_bbox_sinusoid_emb_1d)
        )
        self.register_buffer("inv_freq", inv_freq)

    def forward(self, pos_seq: torch.Tensor) -> torch.Tensor:
        seq_size = pos_seq.size()
        b1, b2, b3 = seq_size
        sinusoid_inp = pos_seq.view(b1, b2, b3, 1) * self.inv_freq.view(1, 1, 1, self.dim_bbox_sinusoid_emb_1d // 2)
        pos_emb = torch.cat([sinusoid_inp.sin(), sinusoid_inp.cos()], dim=-1)
        return pos_emb


class BrosPositionalEmbedding2D(nn.Module):
    def __init__(self, config):
        super().__init__()

        self.dim_bbox = config.dim_bbox
        self.x_pos_emb = BrosPositionalEmbedding1D(config)
        self.y_pos_emb = BrosPositionalEmbedding1D(config)

    def forward(self, bbox: torch.Tensor) -> torch.Tensor:
        stack = []
        for i in range(self.dim_bbox):
            if i % 2 == 0:
                stack.append(self.x_pos_emb(bbox[..., i]))
            else:
                stack.append(self.y_pos_emb(bbox[..., i]))
        bbox_pos_emb = torch.cat(stack, dim=-1)
        return bbox_pos_emb


class BrosBboxEmbeddings(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.bbox_sinusoid_emb = BrosPositionalEmbedding2D(config)
        self.bbox_projection = nn.Linear(config.dim_bbox_sinusoid_emb_2d, config.dim_bbox_projection, bias=False)

    def forward(self, bbox: torch.Tensor):
        bbox_t = bbox.transpose(0, 1)
        bbox_pos = bbox_t[None, :, :, :] - bbox_t[:, None, :, :]
        bbox_pos_emb = self.bbox_sinusoid_emb(bbox_pos)
        bbox_pos_emb = self.bbox_projection(bbox_pos_emb)

        return bbox_pos_emb


class BrosTextEmbeddings(nn.Module):
    """Construct the embeddings from word, position and token_type embeddings."""

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

        self.word_embeddings = nn.Embedding(config.vocab_size, config.hidden_size, padding_idx=config.pad_token_id)
        self.position_embeddings = nn.Embedding(config.max_position_embeddings, config.hidden_size)
        self.token_type_embeddings = nn.Embedding(config.type_vocab_size, config.hidden_size)

        # self.LayerNorm is not snake-cased to stick with TensorFlow model variable name and be able to load
        # any TensorFlow checkpoint file
        self.LayerNorm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.dropout = nn.Dropout(config.hidden_dropout_prob)
        # position_ids (1, len position emb) is contiguous in memory and exported when serialized
        self.position_embedding_type = getattr(config, "position_embedding_type", "absolute")
        self.register_buffer("position_ids", torch.arange(config.max_position_embeddings).expand((1, -1)))
        self.register_buffer(
            "token_type_ids",
            torch.zeros(
                self.position_ids.size(),
                dtype=torch.long,
                device=self.position_ids.device,
            ),
            persistent=False,
        )

    def forward(
        self,
        input_ids: Optional[torch.Tensor] = None,
        token_type_ids: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.Tensor] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
    ) -> torch.Tensor:
        if input_ids is not None:
            input_shape = input_ids.size()
        else:
            input_shape = inputs_embeds.size()[:-1]

        seq_length = input_shape[1]

        if position_ids is None:
            position_ids = self.position_ids[:, :seq_length]

        if token_type_ids is None:
            if hasattr(self, "token_type_ids"):
                buffered_token_type_ids = self.token_type_ids[:, :seq_length]
                buffered_token_type_ids_expanded = buffered_token_type_ids.expand(input_shape[0], seq_length)
                token_type_ids = buffered_token_type_ids_expanded
            else:
                token_type_ids = torch.zeros(input_shape, dtype=torch.long, device=self.position_ids.device)

        if inputs_embeds is None:
            inputs_embeds = self.word_embeddings(input_ids)
        token_type_embeddings = self.token_type_embeddings(token_type_ids)

        embeddings = inputs_embeds + token_type_embeddings
        if self.position_embedding_type == "absolute":
            position_embeddings = self.position_embeddings(position_ids)
            embeddings += position_embeddings
        embeddings = self.LayerNorm(embeddings)
        embeddings = self.dropout(embeddings)
        return embeddings


class BrosSelfAttention(nn.Module):
    def __init__(self, config):
        super().__init__()
        if config.hidden_size % config.num_attention_heads != 0 and not hasattr(config, "embedding_size"):
            raise ValueError(
                f"The hidden size ({config.hidden_size}) is not a multiple of the number of attention "
                f"heads ({config.num_attention_heads})"
            )

        self.num_attention_heads = config.num_attention_heads
        self.attention_head_size = int(config.hidden_size / config.num_attention_heads)
        self.all_head_size = self.num_attention_heads * self.attention_head_size

        self.query = nn.Linear(config.hidden_size, self.all_head_size)
        self.key = nn.Linear(config.hidden_size, self.all_head_size)
        self.value = nn.Linear(config.hidden_size, self.all_head_size)

        self.dropout = nn.Dropout(config.attention_probs_dropout_prob)
        self.position_embedding_type = getattr(config, "position_embedding_type", "absolute")
        if self.position_embedding_type == "relative_key" or self.position_embedding_type == "relative_key_query":
            self.max_position_embeddings = config.max_position_embeddings
            self.distance_embedding = nn.Embedding(2 * config.max_position_embeddings - 1, self.attention_head_size)

        self.is_decoder = config.is_decoder

    def forward(
        self,
        hidden_states: torch.Tensor,
        bbox_pos_emb: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
        head_mask: Optional[torch.Tensor] = None,
        encoder_hidden_states: Optional[torch.Tensor] = None,
        encoder_attention_mask: Optional[torch.Tensor] = None,
        output_attentions: Optional[torch.Tensor] = False,
    ) -> tuple[torch.Tensor]:
        hidden_shape = (hidden_states.shape[0], -1, self.num_attention_heads, self.attention_head_size)
        query_layer = self.query(hidden_states).view(hidden_shape).transpose(1, 2)

        # If this is instantiated as a cross-attention module, the keys
        # and values come from an encoder; the attention mask needs to be
        # such that the encoder's padding tokens are not attended to.
        is_cross_attention = encoder_hidden_states is not None

        if is_cross_attention:
            key_layer = self.key(encoder_hidden_states).view(hidden_shape).transpose(1, 2)
            value_layer = self.value(encoder_hidden_states).view(hidden_shape).transpose(1, 2)
            attention_mask = encoder_attention_mask
        else:
            key_layer = self.key(hidden_states).view(hidden_shape).transpose(1, 2)
            value_layer = self.value(hidden_states).view(hidden_shape).transpose(1, 2)

        # Take the dot product between "query" and "key" to get the raw attention scores.
        attention_scores = torch.matmul(query_layer, key_layer.transpose(-1, -2))

        if self.position_embedding_type == "relative_key" or self.position_embedding_type == "relative_key_query":
            seq_length = hidden_states.size()[1]
            position_ids_l = torch.arange(seq_length, dtype=torch.long, device=hidden_states.device).view(-1, 1)
            position_ids_r = torch.arange(seq_length, dtype=torch.long, device=hidden_states.device).view(1, -1)
            distance = position_ids_l - position_ids_r
            positional_embedding = self.distance_embedding(distance + self.max_position_embeddings - 1)
            positional_embedding = positional_embedding.to(dtype=query_layer.dtype)  # fp16 compatibility

            if self.position_embedding_type == "relative_key":
                relative_position_scores = torch.einsum("bhld,lrd->bhlr", query_layer, positional_embedding)
                attention_scores = attention_scores + relative_position_scores
            elif self.position_embedding_type == "relative_key_query":
                relative_position_scores_query = torch.einsum("bhld,lrd->bhlr", query_layer, positional_embedding)
                relative_position_scores_key = torch.einsum("bhrd,lrd->bhlr", key_layer, positional_embedding)

                attention_scores = attention_scores + relative_position_scores_query + relative_position_scores_key

        # bbox positional encoding
        batch_size, n_head, seq_length, d_head = query_layer.shape
        bbox_pos_emb = bbox_pos_emb.view(seq_length, seq_length, batch_size, d_head)
        bbox_pos_emb = bbox_pos_emb.permute([2, 0, 1, 3])
        bbox_pos_scores = torch.einsum("bnid,bijd->bnij", (query_layer, bbox_pos_emb))

        attention_scores = attention_scores + bbox_pos_scores

        attention_scores = attention_scores / math.sqrt(self.attention_head_size)
        if attention_mask is not None:
            # Apply the attention mask is (precomputed for all layers in BrosModel forward() function)
            attention_scores = attention_scores + attention_mask

        # Normalize the attention scores to probabilities.
        attention_probs = nn.Softmax(dim=-1)(attention_scores)

        # This is actually dropping out entire tokens to attend to, which might
        # seem a bit unusual, but is taken from the original Transformer paper.
        attention_probs = self.dropout(attention_probs)

        # Mask heads if we want to
        if head_mask is not None:
            attention_probs = attention_probs * head_mask

        context_layer = torch.matmul(attention_probs, value_layer)

        context_layer = context_layer.permute(0, 2, 1, 3).contiguous()
        new_context_layer_shape = context_layer.size()[:-2] + (self.all_head_size,)
        context_layer = context_layer.view(*new_context_layer_shape)

        outputs = (context_layer, attention_probs) if output_attentions else (context_layer,)

        if self.is_decoder:
            outputs = outputs + (None,)
        return outputs


# Copied from transformers.models.bert.modeling_bert.BertSelfOutput with Bert->Bros
class BrosSelfOutput(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.dense = nn.Linear(config.hidden_size, config.hidden_size)
        self.LayerNorm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.dropout = nn.Dropout(config.hidden_dropout_prob)

    def forward(self, hidden_states: torch.Tensor, input_tensor: torch.Tensor) -> torch.Tensor:
        hidden_states = self.dense(hidden_states)
        hidden_states = self.dropout(hidden_states)
        hidden_states = self.LayerNorm(hidden_states + input_tensor)
        return hidden_states


class BrosAttention(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.self = BrosSelfAttention(config)
        self.output = BrosSelfOutput(config)
        self.pruned_heads = set()

    def prune_heads(self, heads):
        if len(heads) == 0:
            return
        heads, index = find_pruneable_heads_and_indices(
            heads,
            self.self.num_attention_heads,
            self.self.attention_head_size,
            self.pruned_heads,
        )

        # Prune linear layers
        self.self.query = prune_linear_layer(self.self.query, index)
        self.self.key = prune_linear_layer(self.self.key, index)
        self.self.value = prune_linear_layer(self.self.value, index)
        self.output.dense = prune_linear_layer(self.output.dense, index, dim=1)

        # Update hyper params and store pruned heads
        self.self.num_attention_heads = self.self.num_attention_heads - len(heads)
        self.self.all_head_size = self.self.attention_head_size * self.self.num_attention_heads
        self.pruned_heads = self.pruned_heads.union(heads)

    def forward(
        self,
        hidden_states: torch.Tensor,
        bbox_pos_emb: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
        head_mask: Optional[torch.Tensor] = None,
        encoder_hidden_states: Optional[torch.Tensor] = None,
        encoder_attention_mask: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = False,
    ) -> tuple[torch.Tensor]:
        self_outputs = self.self(
            hidden_states=hidden_states,
            bbox_pos_emb=bbox_pos_emb,
            attention_mask=attention_mask,
            head_mask=head_mask,
            encoder_hidden_states=encoder_hidden_states,
            encoder_attention_mask=encoder_attention_mask,
            output_attentions=output_attentions,
        )
        attention_output = self.output(self_outputs[0], hidden_states)
        outputs = (attention_output,) + self_outputs[1:]  # add attentions if we output them
        return outputs


# Copied from transformers.models.bert.modeling_bert.BertIntermediate with Bert->Bros
class BrosIntermediate(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.dense = nn.Linear(config.hidden_size, config.intermediate_size)
        if isinstance(config.hidden_act, str):
            self.intermediate_act_fn = ACT2FN[config.hidden_act]
        else:
            self.intermediate_act_fn = config.hidden_act

    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
        hidden_states = self.dense(hidden_states)
        hidden_states = self.intermediate_act_fn(hidden_states)
        return hidden_states


class BrosOutput(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.dense = nn.Linear(config.intermediate_size, config.hidden_size)
        self.LayerNorm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.dropout = nn.Dropout(config.hidden_dropout_prob)

    def forward(self, hidden_states: torch.Tensor, input_tensor: torch.Tensor) -> torch.Tensor:
        hidden_states = self.dense(hidden_states)
        hidden_states = self.dropout(hidden_states)
        hidden_states = self.LayerNorm(hidden_states + input_tensor)
        return hidden_states


class BrosLayer(GradientCheckpointingLayer):
    def __init__(self, config):
        super().__init__()
        self.chunk_size_feed_forward = config.chunk_size_feed_forward
        self.seq_len_dim = 1
        self.attention = BrosAttention(config)
        self.is_decoder = config.is_decoder
        self.add_cross_attention = config.add_cross_attention
        if self.add_cross_attention:
            if not self.is_decoder:
                raise Exception(f"{self} should be used as a decoder model if cross attention is added")
            self.crossattention = BrosAttention(config)
        self.intermediate = BrosIntermediate(config)
        self.output = BrosOutput(config)

    def forward(
        self,
        hidden_states: torch.Tensor,
        bbox_pos_emb: torch.Tensor,
        attention_mask: Optional[torch.FloatTensor] = None,
        head_mask: Optional[torch.FloatTensor] = None,
        encoder_hidden_states: Optional[torch.FloatTensor] = None,
        encoder_attention_mask: Optional[torch.FloatTensor] = None,
        output_attentions: Optional[bool] = False,
    ) -> tuple[torch.Tensor]:
        self_attention_outputs = self.attention(
            hidden_states,
            bbox_pos_emb=bbox_pos_emb,
            attention_mask=attention_mask,
            head_mask=head_mask,
            output_attentions=output_attentions,
        )
        attention_output = self_attention_outputs[0]

        # if decoder, the last output is tuple of self-attn cache
        if self.is_decoder:
            outputs = self_attention_outputs[1:-1]
        else:
            outputs = self_attention_outputs[1:]  # add self attentions if we output attention weights

        if self.is_decoder and encoder_hidden_states is not None:
            if hasattr(self, "crossattention"):
                raise Exception(
                    f"If `encoder_hidden_states` are passed, {self} has to be instantiated with cross-attention layers by setting `config.add_cross_attention=True`"
                )

            cross_attention_outputs = self.crossattention(
                attention_output,
                attention_mask=attention_mask,
                head_mask=head_mask,
                encoder_hidden_states=encoder_hidden_states,
                encoder_attention_mask=encoder_attention_mask,
                output_attentions=output_attentions,
            )
            attention_output = cross_attention_outputs[0]
            outputs = outputs + cross_attention_outputs[1:-1]  # add cross attentions if we output attention weights

        layer_output = apply_chunking_to_forward(
            self.feed_forward_chunk,
            self.chunk_size_feed_forward,
            self.seq_len_dim,
            attention_output,
        )
        outputs = (layer_output,) + outputs

        # if decoder, return the attn key/values as the last output
        if self.is_decoder:
            outputs = outputs + (None,)

        return outputs

    def feed_forward_chunk(self, attention_output):
        intermediate_output = self.intermediate(attention_output)
        layer_output = self.output(intermediate_output, attention_output)
        return layer_output


class BrosEncoder(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.layer = nn.ModuleList([BrosLayer(config) for _ in range(config.num_hidden_layers)])

    @can_return_tuple
    def forward(
        self,
        hidden_states: torch.Tensor,
        bbox_pos_emb: torch.Tensor,
        attention_mask: Optional[torch.FloatTensor] = None,
        head_mask: Optional[torch.FloatTensor] = None,
        encoder_hidden_states: Optional[torch.FloatTensor] = None,
        encoder_attention_mask: Optional[torch.FloatTensor] = None,
        output_attentions: Optional[bool] = False,
        output_hidden_states: Optional[bool] = False,
        return_dict: Optional[bool] = True,
    ) -> Union[tuple[torch.Tensor], BaseModelOutputWithCrossAttentions]:
        all_hidden_states = () if output_hidden_states else None
        all_self_attentions = () if output_attentions else None
        all_cross_attentions = () if output_attentions and self.config.add_cross_attention else None

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

            layer_head_mask = head_mask[i] if head_mask is not None else None

            layer_outputs = layer_module(
                hidden_states=hidden_states,
                bbox_pos_emb=bbox_pos_emb,
                attention_mask=attention_mask,
                head_mask=layer_head_mask,
                encoder_hidden_states=encoder_hidden_states,
                encoder_attention_mask=encoder_attention_mask,
                output_attentions=output_attentions,
            )

            hidden_states = layer_outputs[0]
            if output_attentions:
                all_self_attentions = all_self_attentions + (layer_outputs[1],)
                if self.config.add_cross_attention:
                    all_cross_attentions = all_cross_attentions + (layer_outputs[2],)

        if output_hidden_states:
            all_hidden_states = all_hidden_states + (hidden_states,)

        return BaseModelOutputWithCrossAttentions(
            last_hidden_state=hidden_states,
            hidden_states=all_hidden_states,
            attentions=all_self_attentions,
            cross_attentions=all_cross_attentions,
        )


# Copied from transformers.models.bert.modeling_bert.BertPooler with Bert->Bros
class BrosPooler(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.dense = nn.Linear(config.hidden_size, config.hidden_size)
        self.activation = nn.Tanh()

    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
        # We "pool" the model by simply taking the hidden state corresponding
        # to the first token.
        first_token_tensor = hidden_states[:, 0]
        pooled_output = self.dense(first_token_tensor)
        pooled_output = self.activation(pooled_output)
        return pooled_output


class BrosRelationExtractor(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.n_relations = config.n_relations
        self.backbone_hidden_size = config.hidden_size
        self.head_hidden_size = config.hidden_size
        self.classifier_dropout_prob = config.classifier_dropout_prob

        self.drop = nn.Dropout(self.classifier_dropout_prob)
        self.query = nn.Linear(self.backbone_hidden_size, self.n_relations * self.head_hidden_size)

        self.key = nn.Linear(self.backbone_hidden_size, self.n_relations * self.head_hidden_size)

        self.dummy_node = nn.Parameter(torch.zeros(1, self.backbone_hidden_size))

    def forward(self, query_layer: torch.Tensor, key_layer: torch.Tensor):
        query_layer = self.query(self.drop(query_layer))

        dummy_vec = self.dummy_node.unsqueeze(0).repeat(1, key_layer.size(1), 1)
        key_layer = torch.cat([key_layer, dummy_vec], axis=0)
        key_layer = self.key(self.drop(key_layer))

        query_layer = query_layer.view(
            query_layer.size(0), query_layer.size(1), self.n_relations, self.head_hidden_size
        )
        key_layer = key_layer.view(key_layer.size(0), key_layer.size(1), self.n_relations, self.head_hidden_size)

        relation_score = torch.matmul(
            query_layer.permute(2, 1, 0, 3), key_layer.permute(2, 1, 3, 0)
        )  # equivalent to torch.einsum("ibnd,jbnd->nbij", (query_layer, key_layer))

        return relation_score


@auto_docstring
class BrosPreTrainedModel(PreTrainedModel):
    config: BrosConfig
    base_model_prefix = "bros"

    def _init_weights(self, module: nn.Module):
        """Initialize the weights"""
        std = self.config.initializer_range
        if isinstance(module, nn.Linear):
            # Slightly different from the TF version which uses truncated_normal for initialization
            # cf https://github.com/pytorch/pytorch/pull/5617
            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.bias.data.zero_()
            module.weight.data.fill_(1.0)
        elif isinstance(module, BrosRelationExtractor):
            nn.init.normal_(module.dummy_node, std=std)


@auto_docstring
class BrosModel(BrosPreTrainedModel):
    def __init__(self, config, add_pooling_layer=True):
        r"""
        add_pooling_layer (bool, *optional*, defaults to `True`):
            Whether to add a pooling layer
        """
        super().__init__(config)
        self.config = config

        self.embeddings = BrosTextEmbeddings(config)
        self.bbox_embeddings = BrosBboxEmbeddings(config)
        self.encoder = BrosEncoder(config)

        self.pooler = BrosPooler(config) if add_pooling_layer else None

        self.init_weights()

    def get_input_embeddings(self):
        return self.embeddings.word_embeddings

    def set_input_embeddings(self, value):
        self.embeddings.word_embeddings = value

    def _prune_heads(self, heads_to_prune):
        """
        Prunes heads of the model. heads_to_prune: dict of {layer_num: list of heads to prune in this layer} See base
        class PreTrainedModel
        """
        for layer, heads in heads_to_prune.items():
            self.encoder.layer[layer].attention.prune_heads(heads)

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.Tensor] = None,
        bbox: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        token_type_ids: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.Tensor] = None,
        head_mask: Optional[torch.Tensor] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
        encoder_hidden_states: Optional[torch.Tensor] = None,
        encoder_attention_mask: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple[torch.Tensor], BaseModelOutputWithPoolingAndCrossAttentions]:
        r"""
        bbox ('torch.FloatTensor' of shape '(batch_size, num_boxes, 4)'):
            Bounding box coordinates for each token in the input sequence. Each bounding box is a list of four values
            (x1, y1, x2, y2), where (x1, y1) is the top left corner, and (x2, y2) is the bottom right corner of the
            bounding box.

        Examples:

        ```python
        >>> import torch
        >>> from transformers import BrosProcessor, BrosModel

        >>> processor = BrosProcessor.from_pretrained("jinho8345/bros-base-uncased")

        >>> model = BrosModel.from_pretrained("jinho8345/bros-base-uncased")

        >>> encoding = processor("Hello, my dog is cute", add_special_tokens=False, return_tensors="pt")
        >>> bbox = torch.tensor([[[0, 0, 1, 1]]]).repeat(1, encoding["input_ids"].shape[-1], 1)
        >>> encoding["bbox"] = bbox

        >>> outputs = model(**encoding)
        >>> last_hidden_states = outputs.last_hidden_state
        ```"""
        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
        )
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        if input_ids is not None and inputs_embeds is not None:
            raise ValueError("You cannot specify both input_ids and inputs_embeds at the same time")
        elif input_ids is not None:
            input_shape = input_ids.size()
        elif inputs_embeds is not None:
            input_shape = inputs_embeds.size()[:-1]
        else:
            raise ValueError("You have to specify either input_ids or inputs_embeds")

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

        batch_size, seq_length = input_shape
        device = input_ids.device if input_ids is not None else inputs_embeds.device

        if attention_mask is None:
            attention_mask = torch.ones(input_shape, device=device)

        if token_type_ids is None:
            if hasattr(self.embeddings, "token_type_ids"):
                buffered_token_type_ids = self.embeddings.token_type_ids[:, :seq_length]
                buffered_token_type_ids_expanded = buffered_token_type_ids.expand(batch_size, seq_length)
                token_type_ids = buffered_token_type_ids_expanded
            else:
                token_type_ids = torch.zeros(input_shape, dtype=torch.long, device=device)

        # We can provide a self-attention mask of dimensions [batch_size, from_seq_length, to_seq_length]
        # ourselves in which case we just need to make it broadcastable to all heads.
        extended_attention_mask: torch.Tensor = self.get_extended_attention_mask(attention_mask, input_shape, device)

        # If a 2D or 3D attention mask is provided for the cross-attention
        # we need to make broadcastable to [batch_size, num_heads, seq_length, seq_length]
        if self.config.is_decoder and encoder_hidden_states is not None:
            encoder_batch_size, encoder_sequence_length, _ = encoder_hidden_states.size()
            encoder_hidden_shape = (encoder_batch_size, encoder_sequence_length)
            if encoder_attention_mask is None:
                encoder_attention_mask = torch.ones(encoder_hidden_shape, device=device)
            encoder_extended_attention_mask = self.invert_attention_mask(encoder_attention_mask)
        else:
            encoder_extended_attention_mask = None

        # Prepare head mask if needed
        # 1.0 in head_mask indicate we keep the head
        # attention_probs has shape bsz x n_heads x N x N
        # input head_mask has shape [num_heads] or [num_hidden_layers x num_heads]
        # and head_mask is converted to shape [num_hidden_layers x batch x num_heads x seq_length x seq_length]
        head_mask = self.get_head_mask(head_mask, self.config.num_hidden_layers)

        embedding_output = self.embeddings(
            input_ids=input_ids,
            position_ids=position_ids,
            token_type_ids=token_type_ids,
            inputs_embeds=inputs_embeds,
        )

        # if bbox has 2 points (4 float tensors) per token, convert it to 4 points (8 float tensors) per token
        if bbox.shape[-1] == 4:
            bbox = bbox[:, :, [0, 1, 2, 1, 2, 3, 0, 3]]
        scaled_bbox = bbox * self.config.bbox_scale
        bbox_position_embeddings = self.bbox_embeddings(scaled_bbox)

        encoder_outputs = self.encoder(
            embedding_output,
            bbox_pos_emb=bbox_position_embeddings,
            attention_mask=extended_attention_mask,
            head_mask=head_mask,
            encoder_hidden_states=encoder_hidden_states,
            encoder_attention_mask=encoder_extended_attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=True,
        )
        sequence_output = encoder_outputs[0]
        pooled_output = self.pooler(sequence_output) if self.pooler is not None else None

        return BaseModelOutputWithPoolingAndCrossAttentions(
            last_hidden_state=sequence_output,
            pooler_output=pooled_output,
            hidden_states=encoder_outputs.hidden_states,
            attentions=encoder_outputs.attentions,
            cross_attentions=encoder_outputs.cross_attentions,
        )


@auto_docstring
class BrosForTokenClassification(BrosPreTrainedModel):
    _keys_to_ignore_on_load_unexpected = [r"pooler"]

    def __init__(self, config):
        super().__init__(config)
        self.num_labels = config.num_labels

        self.bros = BrosModel(config)
        classifier_dropout = (
            config.classifier_dropout if hasattr(config, "classifier_dropout") else config.hidden_dropout_prob
        )
        self.dropout = nn.Dropout(classifier_dropout)
        self.classifier = nn.Linear(config.hidden_size, config.num_labels)

        self.init_weights()

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.Tensor] = None,
        bbox: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        bbox_first_token_mask: Optional[torch.Tensor] = None,
        token_type_ids: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.Tensor] = None,
        head_mask: Optional[torch.Tensor] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
        labels: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple[torch.Tensor], TokenClassifierOutput]:
        r"""
        bbox ('torch.FloatTensor' of shape '(batch_size, num_boxes, 4)'):
            Bounding box coordinates for each token in the input sequence. Each bounding box is a list of four values
            (x1, y1, x2, y2), where (x1, y1) is the top left corner, and (x2, y2) is the bottom right corner of the
            bounding box.
        bbox_first_token_mask (`torch.FloatTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Mask to indicate the first token of each bounding box. Mask values selected in `[0, 1]`:

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

        Examples:

        ```python
        >>> import torch
        >>> from transformers import BrosProcessor, BrosForTokenClassification

        >>> processor = BrosProcessor.from_pretrained("jinho8345/bros-base-uncased")

        >>> model = BrosForTokenClassification.from_pretrained("jinho8345/bros-base-uncased")

        >>> encoding = processor("Hello, my dog is cute", add_special_tokens=False, return_tensors="pt")
        >>> bbox = torch.tensor([[[0, 0, 1, 1]]]).repeat(1, encoding["input_ids"].shape[-1], 1)
        >>> encoding["bbox"] = bbox

        >>> outputs = model(**encoding)
        ```"""

        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        outputs = self.bros(
            input_ids,
            bbox=bbox,
            attention_mask=attention_mask,
            token_type_ids=token_type_ids,
            position_ids=position_ids,
            head_mask=head_mask,
            inputs_embeds=inputs_embeds,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=True,
        )

        sequence_output = outputs[0]

        sequence_output = self.dropout(sequence_output)
        logits = self.classifier(sequence_output)

        loss = None
        if labels is not None:
            loss_fct = CrossEntropyLoss()
            if bbox_first_token_mask is not None:
                bbox_first_token_mask = bbox_first_token_mask.view(-1)
                loss = loss_fct(
                    logits.view(-1, self.num_labels)[bbox_first_token_mask], labels.view(-1)[bbox_first_token_mask]
                )
            else:
                loss = loss_fct(logits.view(-1, self.num_labels), labels.view(-1))

        return TokenClassifierOutput(
            loss=loss,
            logits=logits,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
        )


@auto_docstring(
    custom_intro="""
    Bros Model with a token classification head on top (initial_token_layers and subsequent_token_layer on top of the
    hidden-states output) e.g. for Named-Entity-Recognition (NER) tasks. The initial_token_classifier is used to
    predict the first token of each entity, and the subsequent_token_classifier is used to predict the subsequent
    tokens within an entity. Compared to BrosForTokenClassification, this model is more robust to serialization errors
    since it predicts next token from one token.
    """
)
class BrosSpadeEEForTokenClassification(BrosPreTrainedModel):
    _keys_to_ignore_on_load_unexpected = [r"pooler"]

    def __init__(self, config):
        super().__init__(config)
        self.config = config
        self.num_labels = config.num_labels
        self.n_relations = config.n_relations
        self.backbone_hidden_size = config.hidden_size

        self.bros = BrosModel(config)
        classifier_dropout = (
            config.classifier_dropout if hasattr(config, "classifier_dropout") else config.hidden_dropout_prob
        )

        # Initial token classification for Entity Extraction (NER)
        self.initial_token_classifier = nn.Sequential(
            nn.Dropout(classifier_dropout),
            nn.Linear(config.hidden_size, config.hidden_size),
            nn.Dropout(classifier_dropout),
            nn.Linear(config.hidden_size, config.num_labels),
        )

        # Subsequent token classification for Entity Extraction (NER)
        self.subsequent_token_classifier = BrosRelationExtractor(config)

        self.init_weights()

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.Tensor] = None,
        bbox: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        bbox_first_token_mask: Optional[torch.Tensor] = None,
        token_type_ids: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.Tensor] = None,
        head_mask: Optional[torch.Tensor] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
        initial_token_labels: Optional[torch.Tensor] = None,
        subsequent_token_labels: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple[torch.Tensor], BrosSpadeOutput]:
        r"""
        bbox ('torch.FloatTensor' of shape '(batch_size, num_boxes, 4)'):
            Bounding box coordinates for each token in the input sequence. Each bounding box is a list of four values
            (x1, y1, x2, y2), where (x1, y1) is the top left corner, and (x2, y2) is the bottom right corner of the
            bounding box.
        bbox_first_token_mask (`torch.FloatTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Mask to indicate the first token of each bounding box. Mask values selected in `[0, 1]`:

            - 1 for tokens that are **not masked**,
            - 0 for tokens that are **masked**.
        initial_token_labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Labels for the initial token classification.
        subsequent_token_labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Labels for the subsequent token classification.

        Examples:

        ```python
        >>> import torch
        >>> from transformers import BrosProcessor, BrosSpadeEEForTokenClassification

        >>> processor = BrosProcessor.from_pretrained("jinho8345/bros-base-uncased")

        >>> model = BrosSpadeEEForTokenClassification.from_pretrained("jinho8345/bros-base-uncased")

        >>> encoding = processor("Hello, my dog is cute", add_special_tokens=False, return_tensors="pt")
        >>> bbox = torch.tensor([[[0, 0, 1, 1]]]).repeat(1, encoding["input_ids"].shape[-1], 1)
        >>> encoding["bbox"] = bbox

        >>> outputs = model(**encoding)
        ```"""

        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        outputs = self.bros(
            input_ids=input_ids,
            bbox=bbox,
            attention_mask=attention_mask,
            token_type_ids=token_type_ids,
            position_ids=position_ids,
            head_mask=head_mask,
            inputs_embeds=inputs_embeds,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=True,
        )

        last_hidden_states = outputs[0]
        last_hidden_states = last_hidden_states.transpose(0, 1).contiguous()
        initial_token_logits = self.initial_token_classifier(last_hidden_states).transpose(0, 1).contiguous()
        subsequent_token_logits = self.subsequent_token_classifier(last_hidden_states, last_hidden_states).squeeze(0)

        # make subsequent token (sequence token classification) mask
        inv_attention_mask = 1 - attention_mask
        batch_size, max_seq_length = inv_attention_mask.shape
        device = inv_attention_mask.device
        invalid_token_mask = torch.cat([inv_attention_mask, torch.zeros([batch_size, 1]).to(device)], axis=1).bool()
        subsequent_token_logits = subsequent_token_logits.masked_fill(
            invalid_token_mask[:, None, :], torch.finfo(subsequent_token_logits.dtype).min
        )
        self_token_mask = torch.eye(max_seq_length, max_seq_length + 1).to(device=device, dtype=torch.bool)
        subsequent_token_logits = subsequent_token_logits.masked_fill(
            self_token_mask[None, :, :], torch.finfo(subsequent_token_logits.dtype).min
        )
        subsequent_token_mask = attention_mask.view(-1).bool()

        loss = None
        if initial_token_labels is not None and subsequent_token_labels is not None:
            loss_fct = CrossEntropyLoss()

            # get initial token loss
            initial_token_labels = initial_token_labels.view(-1)
            if bbox_first_token_mask is not None:
                bbox_first_token_mask = bbox_first_token_mask.view(-1)
                initial_token_loss = loss_fct(
                    initial_token_logits.view(-1, self.num_labels)[bbox_first_token_mask],
                    initial_token_labels[bbox_first_token_mask],
                )
            else:
                initial_token_loss = loss_fct(initial_token_logits.view(-1, self.num_labels), initial_token_labels)

            subsequent_token_labels = subsequent_token_labels.view(-1)
            subsequent_token_loss = loss_fct(
                subsequent_token_logits.view(-1, max_seq_length + 1)[subsequent_token_mask],
                subsequent_token_labels[subsequent_token_mask],
            )

            loss = initial_token_loss + subsequent_token_loss

        return BrosSpadeOutput(
            loss=loss,
            initial_token_logits=initial_token_logits,
            subsequent_token_logits=subsequent_token_logits,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
        )


@auto_docstring(
    custom_intro="""
    Bros Model with a token classification head on top (a entity_linker layer on top of the hidden-states output) e.g.
    for Entity-Linking. The entity_linker is used to predict intra-entity links (one entity to another entity).
    """
)
class BrosSpadeELForTokenClassification(BrosPreTrainedModel):
    _keys_to_ignore_on_load_unexpected = [r"pooler"]

    def __init__(self, config):
        super().__init__(config)
        self.config = config
        self.num_labels = config.num_labels
        self.n_relations = config.n_relations
        self.backbone_hidden_size = config.hidden_size

        self.bros = BrosModel(config)
        (config.classifier_dropout if hasattr(config, "classifier_dropout") else config.hidden_dropout_prob)

        self.entity_linker = BrosRelationExtractor(config)

        self.init_weights()

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.Tensor] = None,
        bbox: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        bbox_first_token_mask: Optional[torch.Tensor] = None,
        token_type_ids: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.Tensor] = None,
        head_mask: Optional[torch.Tensor] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
        labels: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple[torch.Tensor], TokenClassifierOutput]:
        r"""
        bbox ('torch.FloatTensor' of shape '(batch_size, num_boxes, 4)'):
            Bounding box coordinates for each token in the input sequence. Each bounding box is a list of four values
            (x1, y1, x2, y2), where (x1, y1) is the top left corner, and (x2, y2) is the bottom right corner of the
            bounding box.
        bbox_first_token_mask (`torch.FloatTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Mask to indicate the first token of each bounding box. Mask values selected in `[0, 1]`:

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

        Examples:

        ```python
        >>> import torch
        >>> from transformers import BrosProcessor, BrosSpadeELForTokenClassification

        >>> processor = BrosProcessor.from_pretrained("jinho8345/bros-base-uncased")

        >>> model = BrosSpadeELForTokenClassification.from_pretrained("jinho8345/bros-base-uncased")

        >>> encoding = processor("Hello, my dog is cute", add_special_tokens=False, return_tensors="pt")
        >>> bbox = torch.tensor([[[0, 0, 1, 1]]]).repeat(1, encoding["input_ids"].shape[-1], 1)
        >>> encoding["bbox"] = bbox

        >>> outputs = model(**encoding)
        ```"""
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        outputs = self.bros(
            input_ids=input_ids,
            bbox=bbox,
            attention_mask=attention_mask,
            token_type_ids=token_type_ids,
            position_ids=position_ids,
            head_mask=head_mask,
            inputs_embeds=inputs_embeds,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=True,
        )

        last_hidden_states = outputs[0]
        last_hidden_states = last_hidden_states.transpose(0, 1).contiguous()

        logits = self.entity_linker(last_hidden_states, last_hidden_states).squeeze(0)

        loss = None
        if labels is not None:
            loss_fct = CrossEntropyLoss()

            batch_size, max_seq_length = attention_mask.shape
            device = attention_mask.device

            self_token_mask = torch.eye(max_seq_length, max_seq_length + 1).to(device=device, dtype=torch.bool)

            mask = bbox_first_token_mask.view(-1)
            bbox_first_token_mask = torch.cat(
                [
                    ~bbox_first_token_mask,
                    torch.zeros([batch_size, 1], dtype=torch.bool, device=device),
                ],
                axis=1,
            )
            logits = logits.masked_fill(bbox_first_token_mask[:, None, :], torch.finfo(logits.dtype).min)
            logits = logits.masked_fill(self_token_mask[None, :, :], torch.finfo(logits.dtype).min)

            loss = loss_fct(logits.view(-1, max_seq_length + 1)[mask], labels.view(-1)[mask])

        return TokenClassifierOutput(
            loss=loss,
            logits=logits,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
        )


__all__ = [
    "BrosPreTrainedModel",
    "BrosModel",
    "BrosForTokenClassification",
    "BrosSpadeEEForTokenClassification",
    "BrosSpadeELForTokenClassification",
]
