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Source code for mmedit.models.base_models.basic_interpolator

# Copyright (c) OpenMMLab. All rights reserved.
from typing import Optional

import torch

from mmedit.registry import MODELS
from mmedit.utils import tensor2img
from .base_edit_model import BaseEditModel

# TODO tensor2img will be move


@MODELS.register_module()
[docs]class BasicInterpolator(BaseEditModel): """Basic model for video interpolation. It must contain a generator that takes frames as inputs and outputs an interpolated frame. It also has a pixel-wise loss for training. Args: generator (dict): Config for the generator structure. pixel_loss (dict): Config for pixel-wise loss. train_cfg (dict): Config for training. Default: None. test_cfg (dict): Config for testing. Default: None. required_frames (int): Required frames in each process. Default: 2 step_frames (int): Step size of video frame interpolation. Default: 1 init_cfg (dict, optional): The weight initialized config for :class:`BaseModule`. data_preprocessor (dict, optional): The pre-process config of :class:`BaseDataPreprocessor`. Attributes: init_cfg (dict, optional): Initialization config dict. data_preprocessor (:obj:`BaseDataPreprocessor`): Used for pre-processing data sampled by dataloader to the format accepted by :meth:`forward`. """ def __init__(self, generator: dict, pixel_loss: dict, train_cfg: Optional[dict] = None, test_cfg: Optional[dict] = None, required_frames: int = 2, step_frames: int = 1, init_cfg: Optional[dict] = None, data_preprocessor: Optional[dict] = None): super().__init__( generator=generator, pixel_loss=pixel_loss, train_cfg=train_cfg, test_cfg=test_cfg, init_cfg=init_cfg, data_preprocessor=data_preprocessor) # Required frames in each process self.required_frames = required_frames # Step size of video frame interpolation self.step_frames = step_frames
[docs] def split_frames(self, input_tensors: torch.Tensor) -> torch.Tensor: """split input tensors for inference. Args: input_tensors (Tensor): Tensor of input frames with shape [1, t, c, h, w] Returns: Tensor: Split tensor with shape [t-1, 2, c, h, w] """ num_frames = input_tensors.shape[1] result = [ input_tensors[:, i:i + self.required_frames] for i in range(0, num_frames - self.required_frames + 1, self.step_frames) ] result = torch.cat(result, dim=0) return result
@staticmethod
[docs] def merge_frames(input_tensors: torch.Tensor, output_tensors: torch.Tensor) -> list: """merge input frames and output frames. Interpolate a frame between the given two frames. Merged from [[in1, in2], [in2, in3], [in3, in4], ...] [[out1], [out2], [out3], ...] to [in1, out1, in2, out2, in3, out3, in4, ...] Args: input_tensors (Tensor): The input frames with shape [n, 2, c, h, w] output_tensors (Tensor): The output frames with shape [n, 1, c, h, w]. Returns: list[np.array]: The final frames. """ num_frames = input_tensors.shape[0] result = [] for i in range(num_frames): result.append(tensor2img(input_tensors[i, 0])) result.append(tensor2img(output_tensors[i, 0])) result.append(tensor2img(input_tensors[-1, 1])) return result
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