mirror of
https://github.com/graphdeco-inria/gaussian-splatting
synced 2024-11-22 00:08:02 +00:00
37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
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import torch
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import torch.nn as nn
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from .networks import get_network, LinLayers
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from .utils import get_state_dict
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class LPIPS(nn.Module):
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r"""Creates a criterion that measures
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Learned Perceptual Image Patch Similarity (LPIPS).
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Arguments:
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net_type (str): the network type to compare the features:
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'alex' | 'squeeze' | 'vgg'. Default: 'alex'.
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version (str): the version of LPIPS. Default: 0.1.
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"""
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def __init__(self, net_type: str = 'alex', version: str = '0.1'):
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assert version in ['0.1'], 'v0.1 is only supported now'
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super(LPIPS, self).__init__()
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# pretrained network
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self.net = get_network(net_type)
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# linear layers
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self.lin = LinLayers(self.net.n_channels_list)
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self.lin.load_state_dict(get_state_dict(net_type, version))
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def forward(self, x: torch.Tensor, y: torch.Tensor):
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feat_x, feat_y = self.net(x), self.net(y)
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diff = [(fx - fy) ** 2 for fx, fy in zip(feat_x, feat_y)]
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res = [l(d).mean((2, 3), True) for d, l in zip(diff, self.lin)]
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return torch.sum(torch.cat(res, 0), 0, True)
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