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| # Copyright (c) Facebook, Inc. and its affiliates. | |
| # Modified by Bowen Cheng from https://github.com/facebookresearch/detr/blob/master/util/misc.py | |
| """ | |
| Misc functions, including distributed helpers. | |
| Mostly copy-paste from torchvision references. | |
| """ | |
| from typing import List, Optional | |
| import torch | |
| import torch.distributed as dist | |
| import torchvision | |
| from torch import Tensor | |
| def _max_by_axis(the_list): | |
| # type: (List[List[int]]) -> List[int] | |
| maxes = the_list[0] | |
| for sublist in the_list[1:]: | |
| for index, item in enumerate(sublist): | |
| maxes[index] = max(maxes[index], item) | |
| return maxes | |
| class NestedTensor(object): | |
| def __init__(self, tensors, mask: Optional[Tensor]): | |
| self.tensors = tensors | |
| self.mask = mask | |
| def to(self, device): | |
| # type: (Device) -> NestedTensor # noqa | |
| cast_tensor = self.tensors.to(device) | |
| mask = self.mask | |
| if mask is not None: | |
| assert mask is not None | |
| cast_mask = mask.to(device) | |
| else: | |
| cast_mask = None | |
| return NestedTensor(cast_tensor, cast_mask) | |
| def decompose(self): | |
| return self.tensors, self.mask | |
| def __repr__(self): | |
| return str(self.tensors) | |
| def nested_tensor_from_tensor_list(tensor_list: List[Tensor]): | |
| # TODO make this more general | |
| if tensor_list[0].ndim == 3: | |
| if torchvision._is_tracing(): | |
| # nested_tensor_from_tensor_list() does not export well to ONNX | |
| # call _onnx_nested_tensor_from_tensor_list() instead | |
| return _onnx_nested_tensor_from_tensor_list(tensor_list) | |
| # TODO make it support different-sized images | |
| max_size = _max_by_axis([list(img.shape) for img in tensor_list]) | |
| # min_size = tuple(min(s) for s in zip(*[img.shape for img in tensor_list])) | |
| batch_shape = [len(tensor_list)] + max_size | |
| b, c, h, w = batch_shape | |
| dtype = tensor_list[0].dtype | |
| device = tensor_list[0].device | |
| tensor = torch.zeros(batch_shape, dtype=dtype, device=device) | |
| mask = torch.ones((b, h, w), dtype=torch.bool, device=device) | |
| for img, pad_img, m in zip(tensor_list, tensor, mask): | |
| pad_img[: img.shape[0], : img.shape[1], : img.shape[2]].copy_(img) | |
| m[: img.shape[1], : img.shape[2]] = False | |
| else: | |
| raise ValueError("not supported") | |
| return NestedTensor(tensor, mask) | |
| # _onnx_nested_tensor_from_tensor_list() is an implementation of | |
| # nested_tensor_from_tensor_list() that is supported by ONNX tracing. | |
| def _onnx_nested_tensor_from_tensor_list(tensor_list: List[Tensor]) -> NestedTensor: | |
| max_size = [] | |
| for i in range(tensor_list[0].dim()): | |
| max_size_i = torch.max( | |
| torch.stack([img.shape[i] for img in tensor_list]).to(torch.float32) | |
| ).to(torch.int64) | |
| max_size.append(max_size_i) | |
| max_size = tuple(max_size) | |
| # work around for | |
| # pad_img[: img.shape[0], : img.shape[1], : img.shape[2]].copy_(img) | |
| # m[: img.shape[1], :img.shape[2]] = False | |
| # which is not yet supported in onnx | |
| padded_imgs = [] | |
| padded_masks = [] | |
| for img in tensor_list: | |
| padding = [(s1 - s2) for s1, s2 in zip(max_size, tuple(img.shape))] | |
| padded_img = torch.nn.functional.pad(img, (0, padding[2], 0, padding[1], 0, padding[0])) | |
| padded_imgs.append(padded_img) | |
| m = torch.zeros_like(img[0], dtype=torch.int, device=img.device) | |
| padded_mask = torch.nn.functional.pad(m, (0, padding[2], 0, padding[1]), "constant", 1) | |
| padded_masks.append(padded_mask.to(torch.bool)) | |
| tensor = torch.stack(padded_imgs) | |
| mask = torch.stack(padded_masks) | |
| return NestedTensor(tensor, mask=mask) | |
| def is_dist_avail_and_initialized(): | |
| if not dist.is_available(): | |
| return False | |
| if not dist.is_initialized(): | |
| return False | |
| return True | |