| 367 | |
| 368 | |
| 369 | class NestedTensor(object): |
| 370 | def __init__(self, tensors, mask: Optional[Tensor]): |
| 371 | self.tensors = tensors |
| 372 | self.mask = mask |
| 373 | if mask == 'auto': |
| 374 | self.mask = torch.zeros_like(tensors).to(tensors.device) |
| 375 | if self.mask.dim() == 3: |
| 376 | self.mask = self.mask.sum(0).to(bool) |
| 377 | elif self.mask.dim() == 4: |
| 378 | self.mask = self.mask.sum(1).to(bool) |
| 379 | else: |
| 380 | raise ValueError( |
| 381 | 'tensors dim must be 3 or 4 but {}({})'.format( |
| 382 | self.tensors.dim(), self.tensors.shape)) |
| 383 | |
| 384 | def imgsize(self): |
| 385 | res = [] |
| 386 | for i in range(self.tensors.shape[0]): |
| 387 | mask = self.mask[i] |
| 388 | maxH = (~mask).sum(0).max() |
| 389 | maxW = (~mask).sum(1).max() |
| 390 | res.append(torch.Tensor([maxH, maxW])) |
| 391 | return res |
| 392 | |
| 393 | def to(self, device): |
| 394 | # type: (Device) -> NestedTensor # noqa |
| 395 | cast_tensor = self.tensors.to(device) |
| 396 | mask = self.mask |
| 397 | if mask is not None: |
| 398 | assert mask is not None |
| 399 | cast_mask = mask.to(device) |
| 400 | else: |
| 401 | cast_mask = None |
| 402 | return NestedTensor(cast_tensor, cast_mask) |
| 403 | |
| 404 | def to_img_list_single(self, tensor, mask): |
| 405 | assert tensor.dim() == 3, 'dim of tensor should be 3 but {}'.format( |
| 406 | tensor.dim()) |
| 407 | maxH = (~mask).sum(0).max() |
| 408 | maxW = (~mask).sum(1).max() |
| 409 | img = tensor[:, :maxH, :maxW] |
| 410 | return img |
| 411 | |
| 412 | def to_img_list(self): |
| 413 | """remove the padding and convert to img list |
| 414 | Returns: |
| 415 | [type]: [description] |
| 416 | """ |
| 417 | if self.tensors.dim() == 3: |
| 418 | return self.to_img_list_single(self.tensors, self.mask) |
| 419 | else: |
| 420 | res = [] |
| 421 | for i in range(self.tensors.shape[0]): |
| 422 | tensor_i = self.tensors[i] |
| 423 | mask_i = self.mask[i] |
| 424 | res.append(self.to_img_list_single(tensor_i, mask_i)) |
| 425 | return res |
| 426 |
no outgoing calls
no test coverage detected