89 lines
3.0 KiB
Python
89 lines
3.0 KiB
Python
# Copyright (c) OpenMMLab. All rights reserved.
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import numpy as np
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from mmcv.transforms import to_tensor
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from mmcv.transforms.base import BaseTransform
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from mmengine.structures import PixelData
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from mmseg.registry import TRANSFORMS
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from mmseg.structures import SegDataSample
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@TRANSFORMS.register_module()
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class PackSegInputs(BaseTransform):
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"""Pack the inputs data for the semantic segmentation.
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The ``img_meta`` item is always populated. The contents of the
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``img_meta`` dictionary depends on ``meta_keys``. By default this includes:
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- ``img_path``: filename of the image
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- ``ori_shape``: original shape of the image as a tuple (h, w, c)
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- ``img_shape``: shape of the image input to the network as a tuple \
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(h, w, c). Note that images may be zero padded on the \
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bottom/right if the batch tensor is larger than this shape.
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- ``pad_shape``: shape of padded images
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- ``scale_factor``: a float indicating the preprocessing scale
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- ``flip``: a boolean indicating if image flip transform was used
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- ``flip_direction``: the flipping direction
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Args:
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meta_keys (Sequence[str], optional): Meta keys to be packed from
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``SegDataSample`` and collected in ``data[img_metas]``.
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Default: ``('img_path', 'ori_shape',
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'img_shape', 'pad_shape', 'scale_factor', 'flip',
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'flip_direction')``
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"""
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def __init__(self,
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meta_keys=('img_path', 'seg_map_path', 'ori_shape',
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'img_shape', 'pad_shape', 'scale_factor', 'flip',
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'flip_direction')):
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self.meta_keys = meta_keys
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def transform(self, results: dict) -> dict:
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"""Method to pack the input data.
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Args:
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results (dict): Result dict from the data pipeline.
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Returns:
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dict:
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- 'inputs' (obj:`torch.Tensor`): The forward data of models.
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- 'data_sample' (obj:`SegDataSample`): The annotation info of the
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sample.
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"""
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packed_results = dict()
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if 'img' in results:
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img = results['img']
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if len(img.shape) < 3:
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img = np.expand_dims(img, -1)
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img = np.ascontiguousarray(img.transpose(2, 0, 1))
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packed_results['inputs'] = to_tensor(img)
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data_sample = SegDataSample()
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if 'gt_seg_map' in results:
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gt_sem_seg_data = dict(
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data=to_tensor(results['gt_seg_map'][None,
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...].astype(np.int64)))
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data_sample.gt_sem_seg = PixelData(**gt_sem_seg_data)
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img_meta = {}
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for key in self.meta_keys:
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if key in results:
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img_meta[key] = results[key]
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data_sample.set_metainfo(img_meta)
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packed_results['data_samples'] = data_sample
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return packed_results
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def __repr__(self) -> str:
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repr_str = self.__class__.__name__
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repr_str += f'(meta_keys={self.meta_keys})'
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return repr_str
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