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import os |
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import torch |
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import torchvision.transforms as transforms |
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from functools import lru_cache |
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@lru_cache(maxsize=None) |
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def meshgrid(B, H, W, dtype, device, normalized=False): |
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""" |
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Create mesh-grid given batch size, height and width dimensions. From https://github.com/TRI-ML/KP2D. |
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Parameters |
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---------- |
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B: int |
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Batch size |
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H: int |
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Grid Height |
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W: int |
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Batch size |
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dtype: torch.dtype |
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Tensor dtype |
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device: str |
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Tensor device |
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normalized: bool |
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Normalized image coordinates or integer-grid. |
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Returns |
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------- |
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xs: torch.Tensor |
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Batched mesh-grid x-coordinates (BHW). |
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ys: torch.Tensor |
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Batched mesh-grid y-coordinates (BHW). |
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""" |
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if normalized: |
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xs = torch.linspace(-1, 1, W, device=device, dtype=dtype) |
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ys = torch.linspace(-1, 1, H, device=device, dtype=dtype) |
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else: |
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xs = torch.linspace(0, W-1, W, device=device, dtype=dtype) |
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ys = torch.linspace(0, H-1, H, device=device, dtype=dtype) |
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ys, xs = torch.meshgrid([ys, xs]) |
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return xs.repeat([B, 1, 1]), ys.repeat([B, 1, 1]) |
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@lru_cache(maxsize=None) |
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def image_grid(B, H, W, dtype, device, ones=True, normalized=False): |
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""" |
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Create an image mesh grid with shape B3HW given image shape BHW. From https://github.com/TRI-ML/KP2D. |
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Parameters |
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---------- |
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B: int |
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Batch size |
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H: int |
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Grid Height |
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W: int |
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Batch size |
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dtype: str |
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Tensor dtype |
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device: str |
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Tensor device |
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ones : bool |
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Use (x, y, 1) coordinates |
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normalized: bool |
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Normalized image coordinates or integer-grid. |
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Returns |
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------- |
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grid: torch.Tensor |
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Mesh-grid for the corresponding image shape (B3HW) |
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""" |
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xs, ys = meshgrid(B, H, W, dtype, device, normalized=normalized) |
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coords = [xs, ys] |
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if ones: |
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coords.append(torch.ones_like(xs)) |
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grid = torch.stack(coords, dim=1) |
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return grid |
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def to_tensor_sample(sample, tensor_type='torch.FloatTensor'): |
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""" |
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Casts the keys of sample to tensors. From https://github.com/TRI-ML/KP2D. |
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Parameters |
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---------- |
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sample : dict |
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Input sample |
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tensor_type : str |
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Type of tensor we are casting to |
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Returns |
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------- |
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sample : dict |
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Sample with keys cast as tensors |
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""" |
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transform = transforms.ToTensor() |
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sample['image'] = transform(sample['image']).type(tensor_type) |
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return sample |
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def prepare_dirs(config): |
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for path in [config.ckpt_dir]: |
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if not os.path.exists(path): |
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os.makedirs(path) |
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