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Source code for mmedit.models.editors.real_basicvsr.real_basicvsr_net

# Copyright (c) OpenMMLab. All rights reserved.
import torch
import torch.nn as nn
from mmengine.model import BaseModule

from mmedit.registry import MODELS
from ..basicvsr.basicvsr_net import BasicVSRNet, ResidualBlocksWithInputConv


@MODELS.register_module()
[docs]class RealBasicVSRNet(BaseModule): """RealBasicVSR network structure for real-world video super-resolution. Support only x4 upsampling. Paper: Investigating Tradeoffs in Real-World Video Super-Resolution, arXiv Args: mid_channels (int, optional): Channel number of the intermediate features. Default: 64. num_propagation_blocks (int, optional): Number of residual blocks in each propagation branch. Default: 20. num_cleaning_blocks (int, optional): Number of residual blocks in the image cleaning module. Default: 20. dynamic_refine_thres (int, optional): Stop cleaning the images when the residue is smaller than this value. Default: 255. spynet_pretrained (str, optional): Pre-trained model path of SPyNet. Default: None. is_fix_cleaning (bool, optional): Whether to fix the weights of the image cleaning module during training. Default: False. is_sequential_cleaning (bool, optional): Whether to clean the images sequentially. This is used to save GPU memory, but the speed is slightly slower. Default: False. """ def __init__(self, mid_channels=64, num_propagation_blocks=20, num_cleaning_blocks=20, dynamic_refine_thres=255, spynet_pretrained=None, is_fix_cleaning=False, is_sequential_cleaning=False): super().__init__() self.dynamic_refine_thres = dynamic_refine_thres / 255. self.is_sequential_cleaning = is_sequential_cleaning # image cleaning module self.image_cleaning = nn.Sequential( ResidualBlocksWithInputConv(3, mid_channels, num_cleaning_blocks), nn.Conv2d(mid_channels, 3, 3, 1, 1, bias=True), ) if is_fix_cleaning: # keep the weights of the cleaning module fixed self.image_cleaning.requires_grad_(False) # BasicVSR self.basicvsr = BasicVSRNet(mid_channels, num_propagation_blocks, spynet_pretrained) self.basicvsr.spynet.requires_grad_(False)
[docs] def forward(self, lqs, return_lqs=False): """Forward function for BasicVSR++. Args: lqs (tensor): Input low quality (LQ) sequence with shape (n, t, c, h, w). return_lqs (bool): Whether to return LQ sequence. Default: False. Returns: Tensor: Output HR sequence. """ n, t, c, h, w = lqs.size() for _ in range(0, 3): # at most 3 cleaning, determined empirically if self.is_sequential_cleaning: residues = [] for i in range(0, t): residue_i = self.image_cleaning(lqs[:, i, :, :, :]) lqs[:, i, :, :, :] += residue_i residues.append(residue_i) residues = torch.stack(residues, dim=1) else: # time -> batch, then apply cleaning at once lqs = lqs.view(-1, c, h, w) residues = self.image_cleaning(lqs) lqs = (lqs + residues).view(n, t, c, h, w) # determine whether to continue cleaning if torch.mean(torch.abs(residues)) < self.dynamic_refine_thres: break # Super-resolution (BasicVSR) outputs = self.basicvsr(lqs) if return_lqs: return outputs, lqs else: return outputs
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