# Copyright 2023 The Intel AIA Team Authors, and HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License=, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing=, software
# distributed under the License is distributed on an "AS IS" BASIS=,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND=, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""PyTorch TVP Model"""

import math
from dataclasses import dataclass

import torch
from torch import nn

from ... import initialization as init
from ...activations import ACT2FN
from ...backbone_utils import load_backbone
from ...masking_utils import create_bidirectional_mask
from ...modeling_layers import GradientCheckpointingLayer
from ...modeling_outputs import BaseModelOutput, BaseModelOutputWithPooling, ModelOutput
from ...modeling_utils import PreTrainedModel
from ...utils import auto_docstring, logging
from .configuration_tvp import TvpConfig


logger = logging.get_logger(__name__)


@auto_docstring
@dataclass
class TvpVideoGroundingOutput(ModelOutput):
    r"""
    loss (`torch.FloatTensor` of shape `(1,)`, *optional*, returned when `return_loss` is `True`):
        Temporal-Distance IoU loss for video grounding.
    logits (`torch.FloatTensor` of shape `(batch_size, 2)`):
        Contains start_time/duration and end_time/duration. It is the time slot of the videos corresponding to the
        input texts.
    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)`.
    """

    loss: torch.FloatTensor | None = None
    logits: torch.FloatTensor | None = None
    hidden_states: tuple[torch.FloatTensor, ...] | None = None
    attentions: tuple[torch.FloatTensor, ...] | None = None


class TvpLoss(nn.Module):
    """
    This class computes the losses for `TvpForVideoGrounding`. The process happens in two steps: 1) we compute
    hungarian assignment between ground truth boxes and the outputs of the model 2) we supervise each pair of matched
    ground-truth / prediction (supervise class and box).

    Args:
        losses (`list[str]`):
            List of all the losses to be applied.
    """

    def __init__(self, losses):
        super().__init__()
        self.loss_map = {
            "iou": self.loss_iou,
            "distance": self.loss_distance,
            "duration": self.loss_duration,
        }
        for loss in losses:
            if loss not in self.loss_map:
                raise ValueError(f"Loss {loss} not supported")

        self.losses = losses

    def loss_iou(self, start_time, end_time, candidates_start_time, candidates_end_time, duration):
        """
        Measure the intersection over union.
        """
        inter = torch.min(candidates_end_time, end_time) - torch.max(candidates_start_time, start_time)
        union = torch.max(candidates_end_time, end_time) - torch.min(candidates_start_time, start_time)
        iou = 1 - inter.clamp(min=0) / union

        return iou

    def loss_distance(self, start_time, end_time, candidates_start_time, candidates_end_time, duration):
        """
        Measure the distance of mid points.
        """
        mid_candidates = torch.div(torch.add(candidates_start_time, candidates_end_time), 2.0)
        mid_groundtruth = torch.div(torch.add(start_time, end_time), 2.0)
        distance_diff = torch.div(
            torch.max(mid_candidates, mid_groundtruth) - torch.min(mid_candidates, mid_groundtruth), duration
        ).clamp(min=0.2)

        return distance_diff

    def loss_duration(self, start_time, end_time, candidates_start_time, candidates_end_time, duration):
        """
        Measure the difference of duration.
        """
        duration_candidates = torch.sub(candidates_end_time, candidates_start_time)
        duration_groundtruth = torch.sub(end_time, start_time)
        duration_diff = torch.square(torch.div(torch.sub(duration_candidates, duration_groundtruth), duration))
        duration_diff = duration_diff.clamp(min=0.4)

        return duration_diff

    def forward(self, logits, labels):
        """
        This performs the loss computation.

        Args:
            logits (`torch.FloatTensor`):
                The output logits of head module.
            labels (`list[torch.FloatTensor]`):
                List of tensors ([start, end, duration]), which contains start time, end time of the video corresponding to the text, and also the duration.
        """
        duration, start_time, end_time = labels
        candidates = torch.mul(logits, duration)
        candidates_start_time, candidates_end_time = candidates[:, 0].float(), candidates[:, 1].float()

        losses_dict = {}
        for loss in self.losses:
            losses_dict.update(
                {loss: self.loss_map[loss](start_time, end_time, candidates_start_time, candidates_end_time, duration)}
            )

        return losses_dict


class TvpVisionModel(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.backbone = load_backbone(config)

        if config.backbone_config is not None:
            in_channels = config.backbone_config.hidden_sizes[-1]
        elif hasattr(self.backbone, "config") and hasattr(self.backbone.config, "hidden_sizes"):
            in_channels = self.backbone.config.hidden_sizes[-1]
        elif hasattr(self.backbone, "config") and hasattr(self.backbone.config, "hidden_size"):
            in_channels = self.backbone.config.hidden_size
        else:
            raise ValueError("Backbone config not found")

        self.grid_encoder_conv = nn.Conv2d(
            in_channels,
            config.hidden_size,
            kernel_size=3,
            stride=1,
            padding=1,
            groups=1,
            bias=False,
        )

    def forward(self, pixel_values):
        batch_size, num_frames, num_channels, height, width = pixel_values.shape
        # (batch_size * num_frames, num_channels, height, width)
        pixel_values = pixel_values.view(batch_size * num_frames, num_channels, height, width)
        grid_feat_outputs = self.backbone(pixel_values)["feature_maps"][0]
        grid = self.grid_encoder_conv(grid_feat_outputs)
        grid = nn.functional.max_pool2d(grid, kernel_size=2, stride=2)
        grid = nn.functional.relu(grid, inplace=True)
        new_channel, new_height, new_width = grid.shape[-3:]
        # (batch_size, num_frames, num_channels, height, width)
        grid = grid.view(batch_size, num_frames, new_channel, new_height, new_width)
        # (batch_size, num_frames, height, width, num_channels)
        grid = grid.permute(0, 1, 3, 4, 2)
        return grid


class TvpVisualInputEmbedding(nn.Module):
    """
    Takes input of both image and video (multi-frame)
    """

    def __init__(self, config):
        super().__init__()
        # sequence embedding
        self.position_embeddings = nn.Embedding(config.max_position_embeddings, config.hidden_size)
        self.row_position_embeddings = nn.Embedding(config.max_grid_row_position_embeddings, config.hidden_size)
        self.col_position_embeddings = nn.Embedding(config.max_grid_col_position_embeddings, config.hidden_size)
        self.token_type_embeddings = nn.Embedding(1, config.hidden_size)
        self.layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.dropout = nn.Dropout(config.hidden_dropout_prob)
        self.max_grid_row_position_embeddings = config.max_grid_row_position_embeddings
        self.max_grid_col_position_embeddings = config.max_grid_col_position_embeddings

    def interpolate_pos_encoding(self, embedding: torch.Tensor, height: int, width: int) -> torch.Tensor:
        """
        This method allows to interpolate the pre-trained pad weights , to be able to use the model on collection of high
        resolution images (high resolution videos).

        """
        h0 = w0 = 1
        # if height dimension is to be interpolated
        if height > self.max_grid_row_position_embeddings:
            h0 = height / self.max_grid_row_position_embeddings
        # if width dimension is to be interpolated
        if width > self.max_grid_col_position_embeddings:
            w0 = width / self.max_grid_col_position_embeddings
        embedding = embedding.permute(0, 3, 1, 2)  # (batch_size, hidden_dim, height, width)
        embedding = nn.functional.interpolate(
            embedding,
            scale_factor=(h0, w0),
            mode="bicubic",
            align_corners=False,
        )
        embedding = embedding.permute(0, 2, 3, 1)  # (batch_size, height, width, hidden_dim)
        return embedding

    def add_2d_positional_embeddings(self, grid, interpolate_pos_encoding: bool = False):
        """
        Args:
            grid: (batch_size, height, width, hidden_dim)
            interpolate_pos_encoding: (`bool`, *optional*, defaults to `False`):
                Whether to interpolate the pre-trained position encodings.
        Returns:
            grid + col_position_embeddings.view(*col_shape): (batch_size, *, height, width, hidden_dim)
        """
        batch_size, height, width, hidden_dim = grid.shape

        # add row-wise position embeddings
        # (height, )
        row_height = min(self.max_grid_row_position_embeddings, height)
        row_position_ids = torch.arange(row_height, dtype=torch.long, device=grid.device)
        # (height, hidden_dim)
        row_position_embeddings = self.row_position_embeddings(row_position_ids)
        row_shape = (1,) * (len(grid.shape) - 3) + (row_height, 1, hidden_dim)
        # (batch_size, height, 1, hidden_dim)
        row_position_embeddings = row_position_embeddings.view(*row_shape)

        # add column-wise position embeddings
        row_width = min(self.max_grid_col_position_embeddings, width)
        col_position_ids = torch.arange(row_width, dtype=torch.long, device=grid.device)
        # (width, hidden_dim)
        col_position_embeddings = self.col_position_embeddings(col_position_ids)
        col_shape = (batch_size, 1, row_width, hidden_dim)
        # (batch_size, 1, width, hidden_dim)
        col_position_embeddings = col_position_embeddings.view(*col_shape)
        # (batch_size, height, width, hidden_dim)
        positional_embeddings = row_position_embeddings + col_position_embeddings

        # This interpolation gets triggered ONLY when the input image dim is larger in any dimension than the original position embeddings
        if interpolate_pos_encoding and (
            height > self.max_grid_row_position_embeddings or width > self.max_grid_col_position_embeddings
        ):
            grid = grid + self.interpolate_pos_encoding(positional_embeddings, height, width)
        else:
            grid = grid + positional_embeddings
        return grid

    def forward(self, grid, interpolate_pos_encoding: bool = False):
        """
        Args:
            grid: Array of shape (batch_size, num_frames, height, width, num_channels).
                It contains processed frames extracted from videos, and is generated by Tvp image preprocessor. Note,
                num_frames can be 1
            interpolate_pos_encoding: (bool, *optional*, defaults to `False`):
                Whether to interpolate the pre-trained position encodings.

        Returns:
            embeddings: The embedding of grid with size (batch_size, height*width, num_channels)

        """
        batch_size, num_frames, height, width, num_channels = grid.shape
        # temporal mean pooling, (batch_size, height, width, hidden_size)
        grid = grid.mean(1)
        grid = self.add_2d_positional_embeddings(grid, interpolate_pos_encoding=interpolate_pos_encoding)
        # image token sequence, (batch_size, height*width, num_channels)
        visual_tokens = grid.view(batch_size, -1, num_channels)
        visual_tokens_shape = visual_tokens.shape[:-1]
        device = visual_tokens.device

        # image token type embeddings.
        token_type_ids = torch.zeros(visual_tokens_shape, dtype=torch.long, device=device)
        token_type_embeddings = self.token_type_embeddings(token_type_ids)

        embeddings = visual_tokens + token_type_embeddings
        embeddings = self.layer_norm(embeddings)
        embeddings = self.dropout(embeddings)
        return embeddings


class TvpTextInputEmbeddings(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.layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.dropout = nn.Dropout(config.hidden_dropout_prob)

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

        seq_length = input_shape[1]
        device = input_ids.device if input_ids is not None else inputs_embeds.device
        if position_ids is None:
            position_ids = torch.arange(seq_length, dtype=torch.long, device=device)
            position_ids = position_ids.unsqueeze(0).expand(input_shape)
        if token_type_ids is None:
            token_type_ids = torch.zeros(input_shape, dtype=torch.long, device=device)

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

        embeddings = inputs_embeds + position_embeddings + token_type_embeddings
        embeddings = self.layer_norm(embeddings)
        embeddings = self.dropout(embeddings)
        return embeddings


class TvpAttention(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 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.attn_dropout = nn.Dropout(config.attention_probs_dropout_prob)

        self.dense = nn.Linear(config.hidden_size, config.hidden_size)
        self.layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.dropout = nn.Dropout(config.hidden_dropout_prob)

    def _reshape(self, tensor: torch.Tensor, sequence_length: int, batch_size: int):
        return (
            tensor.view(batch_size, sequence_length, self.num_attention_heads, self.attention_head_size)
            .transpose(1, 2)
            .contiguous()
        )

    def forward(
        self,
        hidden_states,
        attention_mask=None,
        output_attentions: bool | None = None,
    ):
        batch_size, sequence_length = hidden_states.shape[:2]
        mixed_query_layer = self.query(hidden_states)

        mixed_key_layer = self.key(hidden_states)
        mixed_value_layer = self.value(hidden_states)

        query_layer = self._reshape(mixed_query_layer, sequence_length, batch_size)
        key_layer = self._reshape(mixed_key_layer, sequence_length, batch_size)
        value_layer = self._reshape(mixed_value_layer, sequence_length, batch_size)

        # 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))
        attention_scores = attention_scores / math.sqrt(self.attention_head_size)
        if attention_mask is not None:
            attention_scores = attention_scores + attention_mask

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

        # 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.attn_dropout(attention_probs)

        attn_output = torch.matmul(attention_probs, value_layer)
        attn_output = attn_output.transpose(1, 2).contiguous()
        attn_output = attn_output.reshape(batch_size, sequence_length, self.all_head_size)

        attn_output = self.dense(attn_output)
        attn_output = self.dropout(attn_output)
        attn_output = self.layer_norm(attn_output + hidden_states)
        # add attentions if we output them
        outputs = (attn_output, attention_probs) if output_attentions else (attn_output,)
        return outputs


# Copied from transformers.models.bert.modeling_bert.BertIntermediate with Bert->Tvp
class TvpIntermediate(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 TvpOutputLayer(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.dense = nn.Linear(config.intermediate_size, config.hidden_size)
        self.layer_norm = 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.layer_norm(hidden_states + input_tensor)
        return hidden_states


class TvpEncodeLayer(GradientCheckpointingLayer):
    def __init__(self, config):
        super().__init__()
        self.attention = TvpAttention(config)
        self.intermediate = TvpIntermediate(config)
        self.output = TvpOutputLayer(config)

    def forward(
        self,
        hidden_states,
        attention_mask=None,
        output_attentions: bool | None = None,
    ):
        self_attention_outputs = self.attention(
            hidden_states,
            attention_mask,
            output_attentions=output_attentions,
        )
        attention_output = self_attention_outputs[0]
        outputs = self_attention_outputs[1:]  # add self attentions if we output attention weights
        intermediate_output = self.intermediate(attention_output)
        layer_output = self.output(intermediate_output, attention_output)
        outputs = (layer_output,) + outputs
        return outputs


class TvpEncoder(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.layer = nn.ModuleList([TvpEncodeLayer(config) for _ in range(config.num_hidden_layers)])
        self.gradient_checkpointing = False

    def forward(
        self,
        hidden_states,
        attention_mask=None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        return_dict: bool | None = None,
    ) -> tuple | BaseModelOutput:
        return_dict = return_dict if return_dict is not None else self.config.return_dict
        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
        )
        all_hidden_states = ()
        all_attentions = ()

        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)

            hidden_states = layer_outputs[0]
            if output_attentions:
                all_attentions = all_attentions + (layer_outputs[1],)

        # Add last layer
        if output_hidden_states:
            all_hidden_states = all_hidden_states + (hidden_states,)

        if not return_dict:
            outputs = (hidden_states,)
            if output_hidden_states:
                outputs = outputs + (all_hidden_states,)
            if output_attentions:
                outputs = outputs + (all_attentions,)
            return outputs  # last-layer hidden state, (all hidden states), (all attentions)

        return BaseModelOutput(
            last_hidden_state=hidden_states,
            hidden_states=all_hidden_states if output_hidden_states else None,
            attentions=all_attentions if output_attentions else None,
        )


# Copied from transformers.models.bert.modeling_bert.BertPooler with Bert->Tvp
class TvpPooler(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


@auto_docstring
class TvpPreTrainedModel(PreTrainedModel):
    config: TvpConfig
    base_model_prefix = "model"
    input_modalities = ("video", "text")
    supports_gradient_checkpointing = True

    @torch.no_grad()
    def _init_weights(self, module: nn.Module):
        """Initialize the weights"""
        if isinstance(module, (nn.Linear, nn.Embedding)):
            init.normal_(module.weight, mean=0.0, std=self.config.initializer_range)
        elif isinstance(module, nn.LayerNorm):
            init.zeros_(module.bias)
            init.ones_(module.weight)
        elif isinstance(module, nn.Conv2d):
            init.kaiming_normal_(module.weight, mode="fan_out", nonlinearity="relu")
            if module.bias is not None:
                init.constant_(module.bias, 0)
        elif isinstance(module, TvpModel):
            init.normal_(module.text_prompt)

        if isinstance(module, nn.Linear) and module.bias is not None:
            init.zeros_(module.bias)
        if hasattr(module, "pad_up"):
            init.normal_(module.pad_up)
        if hasattr(module, "pad_down"):
            init.normal_(module.pad_down)
        if hasattr(module, "pad_left"):
            init.normal_(module.pad_left)
        if hasattr(module, "pad_right"):
            init.normal_(module.pad_right)


class TvpFrameDownPadPrompter(nn.Module):
    """
    Pad frames extracted from videos only at the bottom.
    """

    def __init__(self, config):
        if config.visual_prompter_apply not in ("add", "replace", "remove"):
            raise ValueError("`visual_prompter_apply` must be in (add, replace, remove)")

        super().__init__()
        self.visual_prompt_size = config.visual_prompt_size
        self.frame_num = config.frame_num
        self.max_img_size = config.max_img_size
        self.visual_prompter_apply = config.visual_prompter_apply

        self.pad_down = nn.Parameter(
            torch.randn([1, config.frame_num, 3, config.visual_prompt_size, config.max_img_size])
        )

    def forward(self, pixel_values):
        if self.visual_prompter_apply != "add":
            visual_prompt_mask = torch.ones(
                [self.max_img_size, self.max_img_size], dtype=pixel_values.dtype, device=pixel_values.device
            )
            visual_prompt_mask[self.max_img_size - self.visual_prompt_size : self.max_img_size, :] = 0.0
            pixel_values *= visual_prompt_mask
        if self.visual_prompter_apply != "remove":
            prompt = torch.zeros(
                [pixel_values.shape[0], pixel_values.shape[1], 3, self.max_img_size, self.max_img_size],
                device=pixel_values.device,
            )
            start_point = self.max_img_size - self.visual_prompt_size
            prompt[:, :, :, start_point : self.max_img_size, :] = self.pad_down
            pixel_values += prompt.to(pixel_values.dtype)
        return pixel_values


class TvpFramePadPrompter(nn.Module):
    """
    Pad frames extracted from videos in the surroundings.
    """

    def __init__(self, config):
        if config.visual_prompter_apply not in ("add", "replace", "remove"):
            raise ValueError("`visual_prompter_apply` must be in (add, replace, remove)")

        super().__init__()
        self.num_frames = config.num_frames
        self.max_img_size = config.max_img_size
        self.visual_prompter_apply = config.visual_prompter_apply
        self.base_size = config.max_img_size - config.visual_prompt_size * 2
        self.pad_up = nn.Parameter(
            torch.randn([1, config.num_frames, 3, config.visual_prompt_size, config.max_img_size])
        )
        self.pad_down = nn.Parameter(
            torch.randn([1, config.num_frames, 3, config.visual_prompt_size, config.max_img_size])
        )
        self.pad_left = nn.Parameter(
            torch.randn(
                [
                    1,
                    config.num_frames,
                    3,
                    config.max_img_size - config.visual_prompt_size * 2,
                    config.visual_prompt_size,
                ]
            )
        )
        self.pad_right = nn.Parameter(
            torch.randn(
                [
                    1,
                    config.num_frames,
                    3,
                    config.max_img_size - config.visual_prompt_size * 2,
                    config.visual_prompt_size,
                ]
            )
        )

    def interpolate_pad_encoding(self, prompt: torch.Tensor, height: int, width: int) -> torch.Tensor:
        """
        This method allows to interpolate the pre-trained pad weights, to be able to use the model on collection of high
        resolution images (high resolution videos).

        """

        # creates scale factor from height and width of original image wrt to the config.max_img_size
        h0, w0 = height / self.max_img_size, width / self.max_img_size

        batch, num_frames, channels, prompt_height, prompt_width = prompt.shape

        # reshaping the batch and num_frames dimension into a single one (i.e (b,frames,c,h,w)-->(b*frames,c,h,w)), to apply bicubic interpolation
        prompt = prompt.reshape(batch * num_frames, channels, prompt_height, prompt_width)
        prompt = nn.functional.interpolate(
            prompt,
            scale_factor=(h0, w0),
            mode="bicubic",
            align_corners=False,
        )
        # reversing back to (batch,frames,channels,height,width), where height and width is the new interpolated height and width
        prompt = prompt.reshape(batch, num_frames, channels, height, width)
        return prompt

    def forward(self, pixel_values, interpolate_pad_encoding: bool = False):
        height, width = (
            (pixel_values.shape[-2], pixel_values.shape[-1])
            if interpolate_pad_encoding
            else (self.max_img_size, self.max_img_size)
        )
        if self.visual_prompter_apply not in ("add", "remove", "replace"):
            raise ValueError(f"Invalid visual_prompter_apply value {self.visual_prompter_apply}")
        if self.visual_prompter_apply in ("replace", "remove"):
            visual_prompt_mask = torch.ones([height, width], dtype=pixel_values.dtype, device=pixel_values.device)
            pixel_values *= visual_prompt_mask
        if self.visual_prompter_apply in ("replace", "add"):
            base = torch.zeros(1, self.num_frames, 3, self.base_size, self.base_size, device=pixel_values.device)

            prompt = torch.cat([self.pad_left, base, self.pad_right], dim=4)
            prompt = torch.cat([self.pad_up, prompt, self.pad_down], dim=3)
            prompt = torch.cat(pixel_values.size(0) * [prompt])
            if interpolate_pad_encoding:
                prompt = self.interpolate_pad_encoding(prompt, height, width)
            pixel_values = pixel_values + prompt.to(pixel_values.dtype)
        return pixel_values


TVP_PROMPTER_CLASSES_MAPPING = {
    "framedownpad": TvpFrameDownPadPrompter,
    "framepad": TvpFramePadPrompter,
}


@auto_docstring(
    custom_intro="""
    The bare Tvp Model transformer outputting BaseModelOutputWithPooling object without any specific head on top.
    """
)
class TvpModel(TvpPreTrainedModel):
    def __init__(self, config):
        super().__init__(config)
        self.config = config
        self.vision_model = TvpVisionModel(config)
        self.embeddings = TvpTextInputEmbeddings(config)
        self.visual_embeddings = TvpVisualInputEmbedding(config)
        self.encoder = TvpEncoder(config)
        self.pooler = TvpPooler(config)
        self.text_prompt = nn.Parameter(torch.randn([1, 10, config.hidden_size]))
        self.dropout = nn.Dropout(config.hidden_dropout_prob)
        if config.visual_prompter_type not in TVP_PROMPTER_CLASSES_MAPPING:
            raise ValueError("`visual_prompter_type` must be in (framedownpad, framepad)")
        self.visual_prompter = TVP_PROMPTER_CLASSES_MAPPING[config.visual_prompter_type](config)

        self.post_init()

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

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

    @auto_docstring
    def forward(
        self,
        input_ids: torch.LongTensor | None = None,
        pixel_values: torch.FloatTensor | None = None,
        attention_mask: torch.LongTensor | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        return_dict: bool | None = None,
        interpolate_pos_encoding: bool = False,
        **kwargs,
    ) -> tuple | BaseModelOutputWithPooling:
        r"""
        Examples:
        ```python
        >>> import torch
        >>> from transformers import AutoConfig, AutoTokenizer, TvpModel

        >>> model = TvpModel.from_pretrained("Jiqing/tiny-random-tvp")

        >>> tokenizer = AutoTokenizer.from_pretrained("Jiqing/tiny-random-tvp")

        >>> pixel_values = torch.rand(1, 1, 3, 448, 448)
        >>> text_inputs = tokenizer("This is an example input", return_tensors="pt")
        >>> output = model(text_inputs.input_ids, pixel_values, text_inputs.attention_mask)
        ```"""
        return_dict = return_dict if return_dict is not None else self.config.return_dict
        # Add visual prompt, it compensates for the spatiotemporal information loss in 2D visual features.
        pixel_values = self.vision_model(
            self.visual_prompter(pixel_values, interpolate_pad_encoding=interpolate_pos_encoding)
        )
        # (batch_size, sequence_length, hidden_size)
        text_embedding_output = self.embeddings(input_ids=input_ids)
        # (batch_size, visual_sequence_length, hidden_size)
        visual_embedding_output = self.visual_embeddings(
            pixel_values, interpolate_pos_encoding=interpolate_pos_encoding
        )

        if attention_mask is not None:
            # (batch_size, visual_sequence_length)
            visual_attention_mask = attention_mask.new_ones(visual_embedding_output.shape[:2])
            pt_mask = torch.ones(attention_mask.shape[0], 10).to(
                device=attention_mask.device, dtype=attention_mask.dtype
            )
            attention_mask = torch.cat([pt_mask, attention_mask, visual_attention_mask], dim=-1)

        text_prompt = self.text_prompt.expand(text_embedding_output.shape[0], -1, -1)
        # (batch_size, sequence_length + visual_sequence_length, hidden_size)
        embedding_output = torch.cat([text_prompt, text_embedding_output, visual_embedding_output], dim=1)

        attention_mask = create_bidirectional_mask(
            config=self.config,
            inputs_embeds=embedding_output,
            attention_mask=attention_mask,
        )

        encoder_outputs = self.encoder(
            embedding_output,
            attention_mask=attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )
        last_hidden_state = encoder_outputs.last_hidden_state if return_dict else encoder_outputs[0]
        pooled_output = self.pooler(last_hidden_state)
        last_hidden_state = self.dropout(last_hidden_state)
        pooled_output = self.dropout(pooled_output)
        if not return_dict:
            return (last_hidden_state, pooled_output) + encoder_outputs[1:]
        return BaseModelOutputWithPooling(
            last_hidden_state=last_hidden_state,
            pooler_output=pooled_output,
            hidden_states=encoder_outputs.hidden_states,
            attentions=encoder_outputs.attentions,
        )


class TvpVideoGroundingHead(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.layer_0 = nn.Linear(config.hidden_size, config.hidden_size * 2)
        self.layer_1 = nn.Linear(config.hidden_size * 2, 2)
        self.activation_0 = nn.ReLU()
        self.activation_1 = nn.Sigmoid()

    def forward(self, pooler_output):
        logits = self.activation_0(self.layer_0(pooler_output))
        logits = self.activation_1(self.layer_1(logits))
        return logits


@auto_docstring(
    custom_intro="""
    Tvp Model with a video grounding head on top computing IoU, distance, and duration loss.
    """
)
class TvpForVideoGrounding(TvpPreTrainedModel):
    def __init__(self, config):
        super().__init__(config)
        self.config = config
        self.model = TvpModel(config)
        self.video_grounding_head = TvpVideoGroundingHead(config)

        self.post_init()

    @auto_docstring
    def forward(
        self,
        input_ids: torch.LongTensor | None = None,
        pixel_values: torch.FloatTensor | None = None,
        attention_mask: torch.LongTensor | None = None,
        labels: tuple[torch.Tensor] | None = None,
        output_attentions: bool | None = None,
        output_hidden_states: bool | None = None,
        return_dict: bool | None = None,
        interpolate_pos_encoding: bool = False,
        **kwargs,
    ) -> tuple | TvpVideoGroundingOutput:
        r"""
        labels (`torch.FloatTensor` of shape `(batch_size, 3)`, *optional*):
            The labels contains duration, start time, and end time of the video corresponding to the text.

        Examples:
        ```python
        >>> import torch
        >>> from transformers import AutoConfig, AutoTokenizer, TvpForVideoGrounding

        >>> model = TvpForVideoGrounding.from_pretrained("Jiqing/tiny-random-tvp")

        >>> tokenizer = AutoTokenizer.from_pretrained("Jiqing/tiny-random-tvp")

        >>> pixel_values = torch.rand(1, 1, 3, 448, 448)
        >>> text_inputs = tokenizer("This is an example input", return_tensors="pt")
        >>> output = model(text_inputs.input_ids, pixel_values, text_inputs.attention_mask)
        ```"""
        return_dict = return_dict if return_dict is not None else self.config.return_dict
        outputs = self.model(
            input_ids,
            pixel_values,
            attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
            interpolate_pos_encoding=interpolate_pos_encoding,
        )
        pooler_output = outputs[1]
        logits = self.video_grounding_head(pooler_output)

        loss = None
        if labels is not None:
            criterion = TvpLoss(["iou", "distance", "duration"])
            criterion.to(self.device)
            loss_dict = criterion(logits, labels)
            loss = (
                loss_dict["iou"]
                + self.config.distance_loss_weight * loss_dict["distance"]
                + self.config.duration_loss_weight * loss_dict["duration"]
            )
        if not return_dict:
            outputs = (logits,) + outputs[2:]
            if loss is not None:
                outputs = (loss,) + outputs
            return outputs

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


__all__ = ["TvpModel", "TvpPreTrainedModel", "TvpForVideoGrounding"]
