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24 lines
1.1 KiB
Python
24 lines
1.1 KiB
Python
import torch
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import torch.nn as nn
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backwarp_tenGrid = {}
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def warp(tenInput, tenFlow, cFlag):
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device = torch.device("cuda" if torch.cuda.is_available() and not cFlag else "cpu")
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k = (str(tenFlow.device), str(tenFlow.size()))
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if k not in backwarp_tenGrid:
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tenHorizontal = torch.linspace(-1.0, 1.0, tenFlow.shape[3]).view(
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1, 1, 1, tenFlow.shape[3]).expand(tenFlow.shape[0], -1, tenFlow.shape[2], -1)
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tenVertical = torch.linspace(-1.0, 1.0, tenFlow.shape[2]).view(
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1, 1, tenFlow.shape[2], 1).expand(tenFlow.shape[0], -1, -1, tenFlow.shape[3])
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backwarp_tenGrid[k] = torch.cat(
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[tenHorizontal, tenVertical], 1).to(device)
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tenFlow = torch.cat([tenFlow[:, 0:1, :, :] / ((tenInput.shape[3] - 1.0) / 2.0),
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tenFlow[:, 1:2, :, :] / ((tenInput.shape[2] - 1.0) / 2.0)], 1)
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g = (backwarp_tenGrid[k] + tenFlow).permute(0, 2, 3, 1)
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return torch.nn.functional.grid_sample(input=tenInput, grid=torch.clamp(g, -1, 1), mode='bilinear',
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padding_mode='zeros', align_corners=True)
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