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import warnings |
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from typing import Tuple |
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import torch |
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import numpy as np |
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from ...torchio import TypeData, CHANNELS_DIMENSION |
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from .grid_sampler import GridSampler |
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class GridAggregator: |
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r"""Aggregate patches for dense inference. |
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This class is typically used to build a volume made of batches after |
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inference of patches extracted by a :py:class:`~torchio.data.GridSampler`. |
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Args: |
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sampler: Instance of :py:class:`~torchio.data.GridSampler` used to |
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extract the patches. |
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.. note:: Adapted from NiftyNet. See `this NiftyNet tutorial |
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<https://niftynet.readthedocs.io/en/dev/window_sizes.html>`_ for more |
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information. |
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""" |
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def __init__(self, sampler: GridSampler): |
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sample = sampler.sample |
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self.spatial_shape = sample.spatial_shape |
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self._output_tensor = None |
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self.patch_overlap = sampler.patch_overlap |
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def crop_batch( |
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self, |
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batch: torch.Tensor, |
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location: np.ndarray, |
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overlap: np.ndarray, |
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) -> Tuple[TypeData, np.ndarray]: |
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border = np.array(overlap) // 2 # overlap is even in grid sampler |
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crop_locations = location.astype(int).copy() |
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spatial_shape = batch.shape[2:] # ignore batch and channels dim |
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indices_ini, indices_fin = crop_locations[:, :3], crop_locations[:, 3:] |
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num_locations = len(crop_locations) |
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border_ini = np.tile(border, (num_locations, 1)) |
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border_fin = border_ini.copy() |
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# Do not crop patches at the border of the volume |
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border_ini[indices_ini == 0] = 0 |
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for axis, size in enumerate(self.spatial_shape): |
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border_fin[indices_fin[:, axis] == size, axis] = 0 |
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indices_ini += border |
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indices_fin -= border |
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cropped_shape = np.max(indices_fin - indices_ini, axis=0) |
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diff = spatial_shape - cropped_shape |
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left = np.floor(diff / 2).astype(np.int) |
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i_ini, j_ini, k_ini = left |
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i_fin, j_fin, k_fin = left + cropped_shape |
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cropped_batch = batch[..., i_ini:i_fin, j_ini:j_fin, k_ini:k_fin] |
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return cropped_batch, crop_locations |
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def initialize_output_tensor(self, batch: torch.Tensor) -> None: |
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if self._output_tensor is not None: |
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return |
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num_channels = batch.shape[CHANNELS_DIMENSION] |
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self._output_tensor = torch.zeros( |
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num_channels, |
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*self.spatial_shape, |
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dtype=batch.dtype, |
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) |
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def add_batch(self, batch: torch.Tensor, locations: TypeData) -> None: |
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batch = batch.cpu() |
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locations = locations.cpu().numpy() |
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self.initialize_output_tensor(batch) |
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cropped_batch, crop_locations = self.crop_batch( |
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batch, |
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locations, |
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self.patch_overlap, |
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) |
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for patch, location in zip(cropped_batch, crop_locations): |
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i_ini, j_ini, k_ini, i_fin, j_fin, k_fin = location |
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for channel_idx, tensor in enumerate(patch): |
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self._output_tensor[ |
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channel_idx, |
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i_ini:i_fin, |
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j_ini:j_fin, |
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k_ini:k_fin] = tensor |
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def get_output_tensor(self) -> torch.Tensor: |
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if self._output_tensor.dtype == torch.int64: |
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message = ( |
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'Medical image frameworks such as ITK do not support int64.' |
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' Casting to int32...' |
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) |
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warnings.warn(message) |
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self._output_tensor = self._output_tensor.type(torch.int32) |
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return self._output_tensor |
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fepegar /
torchio
