deepreg.model.backbone.u_net.UNet.build_decode_conv_block() - Code Metrics - Inspection of "Merge pull request #673 from DeepRegNet/671-custom..." - DeepRegNet/DeepReg - Measure and Improve Code Quality continuously with Scrutinizer

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by Yunguan

created 2021-03-05 13:19 UTC

UNet.build_decode_conv_block() A

↳ Parent: deepreg.model.backbone.u_net

Complexity

Conditions

Size

Total Lines	25
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	12
dl	0
loc	25
rs	9.8
c	0
b	0
f	0
cc	1
nop	4

# coding=utf-8


from typing import List, Optional, Tuple, Union

import tensorflow as tf
import tensorflow.keras.layers as tfkl
from tensorflow.python.keras.utils import conv_utils

from deepreg.model import layer, layer_util
from deepreg.model.backbone.interface import Backbone
from deepreg.model.layer import Extraction
from deepreg.registry import REGISTRY


@REGISTRY.register_backbone(name="unet")
class UNet(Backbone):
    """
    Class that implements an adapted 3D UNet.

    Reference:

    - O. Ronneberger, P. Fischer, and T. Brox,
      “U-net: Convolutional networks for biomedical image segmentation,”,
      Lecture Notes in Computer Science, 2015, vol. 9351, pp. 234–241.
      https://arxiv.org/abs/1505.04597
    """

    def __init__(
        self,
        image_size: tuple,
        num_channel_initial: Optional[int],
        depth: int,
        out_kernel_initializer: str,
        out_activation: str,
        out_channels: int,
        extract_levels: Tuple = (0,),
        pooling: bool = True,
        concat_skip: bool = False,
        encode_kernel_sizes: Union[int, List[int]] = 3,
        decode_kernel_sizes: Union[int, List[int]] = 3,
        encode_num_channels: Optional[Tuple] = None,
        decode_num_channels: Optional[Tuple] = None,
        strides: int = 2,
        padding: str = "same",
        name: str = "Unet",
        **kwargs,
    ):
        """
        Initialise UNet.

        :param image_size: (dim1, dim2, dim3), dims of input image.
        :param num_channel_initial: number of initial channels
        :param depth: input is at level 0, bottom is at level depth.
        :param out_kernel_initializer: kernel initializer for the last layer
        :param out_activation: activation at the last layer
        :param out_channels: number of channels for the output
        :param extract_levels: list, which levels from net to extract.
        :param pooling: for down-sampling, use non-parameterized
                        pooling if true, otherwise use conv3d
        :param concat_skip: when up-sampling, concatenate skipped
                            tensor if true, otherwise use addition
        :param encode_kernel_sizes: kernel size for down-sampling
        :param decode_kernel_sizes: kernel size for up-sampling
        :param encode_num_channels: filters/channels for down-sampling,
            by default it is doubled at each layer during down-sampling
        :param decode_num_channels: filters/channels for up-sampling,
            by default it is the same as encode_num_channels
        :param strides: strides for down-sampling
        :param padding: padding mode for all conv layers
        :param name: name of the backbone.
        :param kwargs: additional arguments.
        """
        super().__init__(
            image_size=image_size,
            out_channels=out_channels,
            num_channel_initial=num_channel_initial,
            out_kernel_initializer=out_kernel_initializer,
            out_activation=out_activation,
            name=name,
            **kwargs,
        )

        # save parameters
        assert max(extract_levels) <= depth
        self._extract_levels = extract_levels
        self._depth = depth

        # save extra parameters
        self._concat_skip = concat_skip
        self._pooling = pooling
        self._encode_kernel_sizes = encode_kernel_sizes
        self._decode_kernel_sizes = decode_kernel_sizes
        self._encode_num_channels = encode_num_channels
        self._decode_num_channels = decode_num_channels
        self._strides = strides
        self._padding = padding

        # init layers
        # all lists start with d = 0
        self._encode_convs = None
        self._encode_pools = None
        self._bottom_block = None
        self._decode_deconvs = None
        self._decode_convs = None
        self._output_block = None

        # build layers
        self.build_layers(
            image_size=image_size,
            num_channel_initial=num_channel_initial,
            depth=depth,
            extract_levels=extract_levels,
            encode_kernel_sizes=encode_kernel_sizes,
            decode_kernel_sizes=decode_kernel_sizes,
            encode_num_channels=encode_num_channels,
            decode_num_channels=decode_num_channels,
            strides=strides,
            padding=padding,
            out_kernel_initializer=out_kernel_initializer,
            out_activation=out_activation,
            out_channels=out_channels,
        )

    def build_encode_conv_block(
        self, filters: int, kernel_size: int, padding: str
    ) -> Union[tf.keras.Model, tfkl.Layer]:
        """
        Build a conv block for down-sampling

        This block do not change the tensor shape (width, height, depth),
        it only changes the number of channels.

        :param filters: number of channels for output
        :param kernel_size: arg for conv3d
        :param padding: arg for conv3d
        :return: a block consists of one or multiple layers
        """
        return tf.keras.Sequential(
            [
                layer.Conv3dBlock(
                    filters=filters,
                    kernel_size=kernel_size,
                    padding=padding,
                ),
                layer.ResidualConv3dBlock(
                    filters=filters,
                    kernel_size=kernel_size,
                    padding=padding,
                ),
            ]
        )

    def build_down_sampling_block(
        self, filters: int, kernel_size: int, padding: str, strides: int
    ) -> Union[tf.keras.Model, tfkl.Layer]:
        """
        Build a block for down-sampling.

        This block changes the tensor shape (width, height, depth),
        but it does not changes the number of channels.

        :param filters: number of channels for output, arg for conv3d
        :param kernel_size: arg for pool3d or conv3d
        :param padding: arg for pool3d or conv3d
        :param strides: arg for pool3d or conv3d
        :return: a block consists of one or multiple layers
        """
        if self._pooling:

            return tfkl.MaxPool3D(
                pool_size=kernel_size, strides=strides, padding=padding
            )
        else:
            return layer.Conv3dBlock(
                filters=filters,
                kernel_size=kernel_size,
                strides=strides,
                padding=padding,
            )

    def build_bottom_block(
        self, filters: int, kernel_size: int, padding: str
    ) -> Union[tf.keras.Model, tfkl.Layer]:
        """
        Build a block for bottom layer.

        This block do not change the tensor shape (width, height, depth),
        it only changes the number of channels.

        :param filters: number of channels for output
        :param kernel_size: arg for conv3d
        :param padding: arg for conv3d
        :return: a block consists of one or multiple layers
        """
        return tf.keras.Sequential(
            [
                layer.Conv3dBlock(
                    filters=filters,
                    kernel_size=kernel_size,
                    padding=padding,
                ),
                layer.ResidualConv3dBlock(
                    filters=filters,
                    kernel_size=kernel_size,
                    padding=padding,
                ),
            ]
        )

    def build_up_sampling_block(
        self,
        filters: int,
        output_padding: int,
        kernel_size: int,
        padding: str,
        strides: int,
        output_shape: tuple,

    ) -> Union[tf.keras.Model, tfkl.Layer]:
        """
        Build a block for up-sampling.

        This block changes the tensor shape (width, height, depth),
        but it does not changes the number of channels.

        :param filters: number of channels for output
        :param output_padding: padding for output
        :param kernel_size: arg for deconv3d
        :param padding: arg for deconv3d
        :param strides: arg for deconv3d
        :param output_shape: shape of the output tensor
        :return: a block consists of one or multiple layers
        """
        return layer.Deconv3dBlock(
            filters=filters,
            output_padding=output_padding,
            kernel_size=kernel_size,
            strides=strides,
            padding=padding,
        )

    def build_skip_block(self) -> Union[tf.keras.Model, tfkl.Layer]:
        """
        Build a block for combining skipped tensor and up-sampled one.

        This block do not change the tensor shape (width, height, depth),
        it only changes the number of channels.

        The input to this block is a list of tensors.

        :return: a block consists of one or multiple layers
        """
        if self._concat_skip:

            return tfkl.Concatenate()
        else:
            return tfkl.Add()

    def build_decode_conv_block(
        self, filters: int, kernel_size: int, padding: str
    ) -> Union[tf.keras.Model, tfkl.Layer]:
        """
        Build a conv block for up-sampling

        This block do not change the tensor shape (width, height, depth),
        it only changes the number of channels.

        :param filters: number of channels for output
        :param kernel_size: arg for conv3d
        :param padding: arg for conv3d
        :return: a block consists of one or multiple layers
        """
        return tf.keras.Sequential(
            [
                layer.Conv3dBlock(
                    filters=filters,
                    kernel_size=kernel_size,
                    padding=padding,
                ),
                layer.ResidualConv3dBlock(
                    filters=filters,
                    kernel_size=kernel_size,
                    padding=padding,
                ),
            ]
        )

    def build_output_block(
        self,
        image_size: Tuple[int],
        extract_levels: Tuple[int],
        out_channels: int,
        out_kernel_initializer: str,
        out_activation: str,
    ) -> Union[tf.keras.Model, tfkl.Layer]:
        """
        Build a block for output.

        The input to this block is a list of tensors.

        :param image_size: such as (dim1, dim2, dim3)
        :param extract_levels: number of extraction levels.
        :param out_channels: number of channels for the extractions
        :param out_kernel_initializer: initializer to use for kernels.
        :param out_activation: activation to use at end layer.
        :return: a block consists of one or multiple layers
        """
        return Extraction(
            image_size=image_size,
            extract_levels=extract_levels,
            out_channels=out_channels,
            out_kernel_initializer=out_kernel_initializer,
            out_activation=out_activation,
        )

    def build_layers(

        self,
        image_size: tuple,
        num_channel_initial: int,
        depth: int,
        extract_levels: Tuple[int],
        encode_kernel_sizes: Union[int, List[int]],
        decode_kernel_sizes: Union[int, List[int]],
        encode_num_channels: Optional[Tuple],
        decode_num_channels: Optional[Tuple],
        strides: int,
        padding: str,
        out_kernel_initializer: str,
        out_activation: str,
        out_channels: int,
    ):
        """
        Build layers that will be used in call.

        :param image_size: (dim1, dim2, dim3).
        :param num_channel_initial: number of initial channels.
        :param depth: network starts with d = 0, and the bottom has d = depth.
        :param extract_levels: from which depths the output will be built.
        :param encode_kernel_sizes: kernel size for down-sampling
        :param decode_kernel_sizes: kernel size for up-sampling
        :param encode_num_channels: filters/channels for down-sampling,
            by default it is doubled at each layer during down-sampling
        :param decode_num_channels: filters/channels for up-sampling,
            by default it is the same as encode_num_channels
        :param strides: strides for down-sampling
        :param padding: padding mode for all conv layers
        :param out_kernel_initializer: initializer to use for kernels.
        :param out_activation: activation to use at end layer.
        :param out_channels: number of channels for the extractions
        """
        if encode_num_channels is None:
            assert num_channel_initial >= 1
            encode_num_channels = tuple(
                num_channel_initial * (2 ** d) for d in range(depth + 1)
            )
        assert len(encode_num_channels) == depth + 1
        if decode_num_channels is None:
            decode_num_channels = encode_num_channels
        assert len(decode_num_channels) == depth + 1
        if not self._concat_skip:
            # in case of adding skip tensors, the channels should match
            if decode_num_channels != encode_num_channels:
                raise ValueError(
                    "For UNet, if the skipped tensor is added "
                    "instead of being concatenated, "
                    "the encode_num_channels and decode_num_channels "
                    "should be the same. "
                    f"But got encode_num_channels = {encode_num_channels},"
                    f"decode_num_channels = {decode_num_channels}."
                )
        tensor_shapes = self.build_encode_layers(
            image_size=image_size,
            num_channels=encode_num_channels,
            depth=depth,
            encode_kernel_sizes=encode_kernel_sizes,
            strides=strides,
            padding=padding,
        )
        self.build_decode_layers(
            tensor_shapes=tensor_shapes,
            image_size=image_size,
            num_channels=decode_num_channels,
            depth=depth,
            extract_levels=extract_levels,
            decode_kernel_sizes=decode_kernel_sizes,
            strides=strides,
            padding=padding,
            out_kernel_initializer=out_kernel_initializer,
            out_activation=out_activation,
            out_channels=out_channels,
        )

    def build_encode_layers(
        self,
        image_size: Tuple,
        num_channels: Tuple,
        depth: int,
        encode_kernel_sizes: Union[int, List[int]],
        strides: int,
        padding: str,
    ) -> List[Tuple]:
        """
        Build layers for encoding.

        :param image_size: (dim1, dim2, dim3).
        :param num_channels: number of channels for each layer,
            starting from the top layer.
        :param depth: network starts with d = 0, and the bottom has d = depth.
        :param encode_kernel_sizes: kernel size for down-sampling
        :param strides: strides for down-sampling
        :param padding: padding mode for all conv layers
        :return: list of tensor shapes starting from d = 0
        """
        if isinstance(encode_kernel_sizes, int):
            encode_kernel_sizes = [encode_kernel_sizes] * (depth + 1)
        assert len(encode_kernel_sizes) == depth + 1

        # encoding / down-sampling
        self._encode_convs = []
        self._encode_pools = []
        tensor_shape = image_size
        tensor_shapes = [tensor_shape]
        for d in range(depth):
            encode_conv = self.build_encode_conv_block(
                filters=num_channels[d],
                kernel_size=encode_kernel_sizes[d],
                padding=padding,
            )
            encode_pool = self.build_down_sampling_block(
                filters=num_channels[d],
                kernel_size=strides,
                strides=strides,
                padding=padding,
            )
            tensor_shape = tuple(
                conv_utils.conv_output_length(
                    input_length=x,
                    filter_size=strides,
                    padding=padding,
                    stride=strides,
                    dilation=1,
                )
                for x in tensor_shape
            )
            self._encode_convs.append(encode_conv)
            self._encode_pools.append(encode_pool)
            tensor_shapes.append(tensor_shape)

        # bottom layer
        self._bottom_block = self.build_bottom_block(
            filters=num_channels[depth],
            kernel_size=encode_kernel_sizes[depth],
            padding=padding,
        )
        return tensor_shapes

    def build_decode_layers(
        self,
        tensor_shapes: List[Tuple],
        image_size: Tuple,
        num_channels: Tuple,
        depth: int,
        extract_levels: Tuple[int],
        decode_kernel_sizes: Union[int, List[int]],
        strides: int,
        padding: str,
        out_kernel_initializer: str,
        out_activation: str,
        out_channels: int,
    ):
        """
        Build layers for decoding.

        :param tensor_shapes: shapes calculated in encoder
        :param image_size: (dim1, dim2, dim3).
        :param num_channels: number of channels for each layer,
            starting from the top layer.
        :param depth: network starts with d = 0, and the bottom has d = depth.
        :param extract_levels: from which depths the output will be built.
        :param decode_kernel_sizes: kernel size for up-sampling
        :param strides: strides for down-sampling
        :param padding: padding mode for all conv layers
        :param out_kernel_initializer: initializer to use for kernels.
        :param out_activation: activation to use at end layer.
        :param out_channels: number of channels for the extractions
        """
        # init params
        min_extract_level = min(extract_levels)
        if isinstance(decode_kernel_sizes, int):
            decode_kernel_sizes = [decode_kernel_sizes] * depth
        assert len(decode_kernel_sizes) == depth

        # decoding / up-sampling
        self._decode_deconvs = []
        self._decode_convs = []
        for d in range(depth - 1, min_extract_level - 1, -1):
            kernel_size = decode_kernel_sizes[d]
            output_padding = layer_util.deconv_output_padding(
                input_shape=tensor_shapes[d + 1],
                output_shape=tensor_shapes[d],
                kernel_size=kernel_size,
                stride=strides,
                padding=padding,
            )
            decode_deconv = self.build_up_sampling_block(
                filters=num_channels[d],
                output_padding=output_padding,
                kernel_size=kernel_size,
                strides=strides,
                padding=padding,
                output_shape=tensor_shapes[d],
            )
            decode_conv = self.build_decode_conv_block(
                filters=num_channels[d], kernel_size=kernel_size, padding=padding
            )
            self._decode_deconvs = [decode_deconv] + self._decode_deconvs
            self._decode_convs = [decode_conv] + self._decode_convs
        if min_extract_level > 0:
            # add Nones to make lists have length depth - 1
            self._decode_deconvs = [None] * min_extract_level + self._decode_deconvs
            self._decode_convs = [None] * min_extract_level + self._decode_convs

        # extraction
        self._output_block = self.build_output_block(
            image_size=image_size,
            extract_levels=extract_levels,
            out_channels=out_channels,
            out_kernel_initializer=out_kernel_initializer,
            out_activation=out_activation,
        )

    def call(self, inputs: tf.Tensor, training=None, mask=None) -> tf.Tensor:

        """
        Build compute graph based on built layers.

        :param inputs: image batch, shape = (batch, f_dim1, f_dim2, f_dim3, ch)
        :param training: None or bool.
        :param mask: None or tf.Tensor.
        :return: shape = (batch, f_dim1, f_dim2, f_dim3, out_channels)
        """

        # encoding / down-sampling
        skips = []
        encoded = inputs
        for d in range(self._depth):
            skip = self._encode_convs[d](inputs=encoded, training=training)
            encoded = self._encode_pools[d](inputs=skip, training=training)
            skips.append(skip)

        # bottom
        decoded = self._bottom_block(inputs=encoded, training=training)

        # decoding / up-sampling
        outs = [decoded]
        for d in range(self._depth - 1, min(self._extract_levels) - 1, -1):
            decoded = self._decode_deconvs[d](inputs=decoded, training=training)
            decoded = self.build_skip_block()([decoded, skips[d]])
            decoded = self._decode_convs[d](inputs=decoded, training=training)
            outs = [decoded] + outs

        # output
        output = self._output_block(outs)

        return output

    def get_config(self) -> dict:
        """Return the config dictionary for recreating this class."""
        config = super().get_config()
        config.update(
            depth=self._depth,
            extract_levels=self._extract_levels,
            pooling=self._pooling,
            concat_skip=self._concat_skip,
            encode_kernel_sizes=self._encode_kernel_sizes,
            decode_kernel_sizes=self._decode_kernel_sizes,
            encode_num_channels=self._encode_num_channels,
            decode_num_channels=self._decode_num_channels,
            strides=self._strides,
            padding=self._padding,
        )
        return config


1			# coding=utf-8
			0 ignored issues – show introduced 2021-01-26 01:41 UTC by Report Bug Copy Issue Report Missing module docstring Loading history...
2
3			from typing import List, Optional, Tuple, Union
4
5			import tensorflow as tf
6			import tensorflow.keras.layers as tfkl
7			from tensorflow.python.keras.utils import conv_utils
8
9			from deepreg.model import layer, layer_util
10			from deepreg.model.backbone.interface import Backbone
11			from deepreg.model.layer import Extraction
12			from deepreg.registry import REGISTRY
13
14
15			@REGISTRY.register_backbone(name="unet")
16			class UNet(Backbone):
17			"""
18			Class that implements an adapted 3D UNet.
19
20			Reference:
21
22			- O. Ronneberger, P. Fischer, and T. Brox,
23			“U-net: Convolutional networks for biomedical image segmentation,”,
24			Lecture Notes in Computer Science, 2015, vol. 9351, pp. 234–241.
25			https://arxiv.org/abs/1505.04597
26			"""
27
28			def __init__(
29			self,
30			image_size: tuple,
31			num_channel_initial: Optional[int],
32			depth: int,
33			out_kernel_initializer: str,
34			out_activation: str,
35			out_channels: int,
36			extract_levels: Tuple = (0,),
37			pooling: bool = True,
38			concat_skip: bool = False,
39			encode_kernel_sizes: Union[int, List[int]] = 3,
40			decode_kernel_sizes: Union[int, List[int]] = 3,
41			encode_num_channels: Optional[Tuple] = None,
42			decode_num_channels: Optional[Tuple] = None,
43			strides: int = 2,
44			padding: str = "same",
45			name: str = "Unet",
46			**kwargs,
47			):
48			"""
49			Initialise UNet.
50
51			:param image_size: (dim1, dim2, dim3), dims of input image.
52			:param num_channel_initial: number of initial channels
53			:param depth: input is at level 0, bottom is at level depth.
54			:param out_kernel_initializer: kernel initializer for the last layer
55			:param out_activation: activation at the last layer
56			:param out_channels: number of channels for the output
57			:param extract_levels: list, which levels from net to extract.
58			:param pooling: for down-sampling, use non-parameterized
59			pooling if true, otherwise use conv3d
60			:param concat_skip: when up-sampling, concatenate skipped
61			tensor if true, otherwise use addition
62			:param encode_kernel_sizes: kernel size for down-sampling
63			:param decode_kernel_sizes: kernel size for up-sampling
64			:param encode_num_channels: filters/channels for down-sampling,
65			by default it is doubled at each layer during down-sampling
66			:param decode_num_channels: filters/channels for up-sampling,
67			by default it is the same as encode_num_channels
68			:param strides: strides for down-sampling
69			:param padding: padding mode for all conv layers
70			:param name: name of the backbone.
71			:param kwargs: additional arguments.
72			"""
73			super().__init__(
74			image_size=image_size,
75			out_channels=out_channels,
76			num_channel_initial=num_channel_initial,
77			out_kernel_initializer=out_kernel_initializer,
78			out_activation=out_activation,
79			name=name,
80			**kwargs,
81			)
82
83			# save parameters
84			assert max(extract_levels) <= depth
85			self._extract_levels = extract_levels
86			self._depth = depth
87
88			# save extra parameters
89			self._concat_skip = concat_skip
90			self._pooling = pooling
91			self._encode_kernel_sizes = encode_kernel_sizes
92			self._decode_kernel_sizes = decode_kernel_sizes
93			self._encode_num_channels = encode_num_channels
94			self._decode_num_channels = decode_num_channels
95			self._strides = strides
96			self._padding = padding
97
98			# init layers
99			# all lists start with d = 0
100			self._encode_convs = None
101			self._encode_pools = None
102			self._bottom_block = None
103			self._decode_deconvs = None
104			self._decode_convs = None
105			self._output_block = None
106
107			# build layers
108			self.build_layers(
109			image_size=image_size,
110			num_channel_initial=num_channel_initial,
111			depth=depth,
112			extract_levels=extract_levels,
113			encode_kernel_sizes=encode_kernel_sizes,
114			decode_kernel_sizes=decode_kernel_sizes,
115			encode_num_channels=encode_num_channels,
116			decode_num_channels=decode_num_channels,
117			strides=strides,
118			padding=padding,
119			out_kernel_initializer=out_kernel_initializer,
120			out_activation=out_activation,
121			out_channels=out_channels,
122			)
123
124			def build_encode_conv_block(
125			self, filters: int, kernel_size: int, padding: str
126			) -> Union[tf.keras.Model, tfkl.Layer]:
127			"""
128			Build a conv block for down-sampling
129
130			This block do not change the tensor shape (width, height, depth),
131			it only changes the number of channels.
132
133			:param filters: number of channels for output
134			:param kernel_size: arg for conv3d
135			:param padding: arg for conv3d
136			:return: a block consists of one or multiple layers
137			"""
138			return tf.keras.Sequential(
139			[
140			layer.Conv3dBlock(
141			filters=filters,
142			kernel_size=kernel_size,
143			padding=padding,
144			),
145			layer.ResidualConv3dBlock(
146			filters=filters,
147			kernel_size=kernel_size,
148			padding=padding,
149			),
150			]
151			)
152
153			def build_down_sampling_block(
154			self, filters: int, kernel_size: int, padding: str, strides: int
155			) -> Union[tf.keras.Model, tfkl.Layer]:
156			"""
157			Build a block for down-sampling.
158
159			This block changes the tensor shape (width, height, depth),
160			but it does not changes the number of channels.
161
162			:param filters: number of channels for output, arg for conv3d
163			:param kernel_size: arg for pool3d or conv3d
164			:param padding: arg for pool3d or conv3d
165			:param strides: arg for pool3d or conv3d
166			:return: a block consists of one or multiple layers
167			"""
168			if self._pooling:
			0 ignored issues – show unused-code introduced 2021-02-18 00:01 UTC by Report Bug Copy Issue Report Unnecessary "else" after "return" Loading history...
169			return tfkl.MaxPool3D(
170			pool_size=kernel_size, strides=strides, padding=padding
171			)
172			else:
173			return layer.Conv3dBlock(
174			filters=filters,
175			kernel_size=kernel_size,
176			strides=strides,
177			padding=padding,
178			)
179
180			def build_bottom_block(
181			self, filters: int, kernel_size: int, padding: str
182			) -> Union[tf.keras.Model, tfkl.Layer]:
183			"""
184			Build a block for bottom layer.
185
186			This block do not change the tensor shape (width, height, depth),
187			it only changes the number of channels.
188
189			:param filters: number of channels for output
190			:param kernel_size: arg for conv3d
191			:param padding: arg for conv3d
192			:return: a block consists of one or multiple layers
193			"""
194			return tf.keras.Sequential(
195			[
196			layer.Conv3dBlock(
197			filters=filters,
198			kernel_size=kernel_size,
199			padding=padding,
200			),
201			layer.ResidualConv3dBlock(
202			filters=filters,
203			kernel_size=kernel_size,
204			padding=padding,
205			),
206			]
207			)
208
209			def build_up_sampling_block(
210			self,
211			filters: int,
212			output_padding: int,
213			kernel_size: int,
214			padding: str,
215			strides: int,
216			output_shape: tuple,
			0 ignored issues – show Unused Code introduced 2021-02-18 00:01 UTC by Report Bug Copy Issue Report The argument `output_shape` seems to be unused. Loading history...
217			) -> Union[tf.keras.Model, tfkl.Layer]:
218			"""
219			Build a block for up-sampling.
220
221			This block changes the tensor shape (width, height, depth),
222			but it does not changes the number of channels.
223
224			:param filters: number of channels for output
225			:param output_padding: padding for output
226			:param kernel_size: arg for deconv3d
227			:param padding: arg for deconv3d
228			:param strides: arg for deconv3d
229			:param output_shape: shape of the output tensor
230			:return: a block consists of one or multiple layers
231			"""
232			return layer.Deconv3dBlock(
233			filters=filters,
234			output_padding=output_padding,
235			kernel_size=kernel_size,
236			strides=strides,
237			padding=padding,
238			)
239
240			def build_skip_block(self) -> Union[tf.keras.Model, tfkl.Layer]:
241			"""
242			Build a block for combining skipped tensor and up-sampled one.
243
244			This block do not change the tensor shape (width, height, depth),
245			it only changes the number of channels.
246
247			The input to this block is a list of tensors.
248
249			:return: a block consists of one or multiple layers
250			"""
251			if self._concat_skip:
			0 ignored issues – show unused-code introduced 2021-02-18 00:01 UTC by Report Bug Copy Issue Report Unnecessary "else" after "return" Loading history...
252			return tfkl.Concatenate()
253			else:
254			return tfkl.Add()
255
256			def build_decode_conv_block(
257			self, filters: int, kernel_size: int, padding: str
258			) -> Union[tf.keras.Model, tfkl.Layer]:
259			"""
260			Build a conv block for up-sampling
261
262			This block do not change the tensor shape (width, height, depth),
263			it only changes the number of channels.
264
265			:param filters: number of channels for output
266			:param kernel_size: arg for conv3d
267			:param padding: arg for conv3d
268			:return: a block consists of one or multiple layers
269			"""
270			return tf.keras.Sequential(
271			[
272			layer.Conv3dBlock(
273			filters=filters,
274			kernel_size=kernel_size,
275			padding=padding,
276			),
277			layer.ResidualConv3dBlock(
278			filters=filters,
279			kernel_size=kernel_size,
280			padding=padding,
281			),
282			]
283			)
284
285			def build_output_block(
286			self,
287			image_size: Tuple[int],
288			extract_levels: Tuple[int],
289			out_channels: int,
290			out_kernel_initializer: str,
291			out_activation: str,
292			) -> Union[tf.keras.Model, tfkl.Layer]:
293			"""
294			Build a block for output.
295
296			The input to this block is a list of tensors.
297
298			:param image_size: such as (dim1, dim2, dim3)
299			:param extract_levels: number of extraction levels.
300			:param out_channels: number of channels for the extractions
301			:param out_kernel_initializer: initializer to use for kernels.
302			:param out_activation: activation to use at end layer.
303			:return: a block consists of one or multiple layers
304			"""
305			return Extraction(
306			image_size=image_size,
307			extract_levels=extract_levels,
308			out_channels=out_channels,
309			out_kernel_initializer=out_kernel_initializer,
310			out_activation=out_activation,
311			)
312
313			def build_layers(
			0 ignored issues – show introduced 2021-02-20 23:13 UTC by Report Bug Copy Issue Report "ValueError" not documented as being raised Loading history...
314			self,
315			image_size: tuple,
316			num_channel_initial: int,
317			depth: int,
318			extract_levels: Tuple[int],
319			encode_kernel_sizes: Union[int, List[int]],
320			decode_kernel_sizes: Union[int, List[int]],
321			encode_num_channels: Optional[Tuple],
322			decode_num_channels: Optional[Tuple],
323			strides: int,
324			padding: str,
325			out_kernel_initializer: str,
326			out_activation: str,
327			out_channels: int,
328			):
329			"""
330			Build layers that will be used in call.
331
332			:param image_size: (dim1, dim2, dim3).
333			:param num_channel_initial: number of initial channels.
334			:param depth: network starts with d = 0, and the bottom has d = depth.
335			:param extract_levels: from which depths the output will be built.
336			:param encode_kernel_sizes: kernel size for down-sampling
337			:param decode_kernel_sizes: kernel size for up-sampling
338			:param encode_num_channels: filters/channels for down-sampling,
339			by default it is doubled at each layer during down-sampling
340			:param decode_num_channels: filters/channels for up-sampling,
341			by default it is the same as encode_num_channels
342			:param strides: strides for down-sampling
343			:param padding: padding mode for all conv layers
344			:param out_kernel_initializer: initializer to use for kernels.
345			:param out_activation: activation to use at end layer.
346			:param out_channels: number of channels for the extractions
347			"""
348			if encode_num_channels is None:
349			assert num_channel_initial >= 1
350			encode_num_channels = tuple(
351			num_channel_initial * (2 ** d) for d in range(depth + 1)
352			)
353			assert len(encode_num_channels) == depth + 1
354			if decode_num_channels is None:
355			decode_num_channels = encode_num_channels
356			assert len(decode_num_channels) == depth + 1
357			if not self._concat_skip:
358			# in case of adding skip tensors, the channels should match
359			if decode_num_channels != encode_num_channels:
360			raise ValueError(
361			"For UNet, if the skipped tensor is added "
362			"instead of being concatenated, "
363			"the encode_num_channels and decode_num_channels "
364			"should be the same. "
365			f"But got encode_num_channels = {encode_num_channels},"
366			f"decode_num_channels = {decode_num_channels}."
367			)
368			tensor_shapes = self.build_encode_layers(
369			image_size=image_size,
370			num_channels=encode_num_channels,
371			depth=depth,
372			encode_kernel_sizes=encode_kernel_sizes,
373			strides=strides,
374			padding=padding,
375			)
376			self.build_decode_layers(
377			tensor_shapes=tensor_shapes,
378			image_size=image_size,
379			num_channels=decode_num_channels,
380			depth=depth,
381			extract_levels=extract_levels,
382			decode_kernel_sizes=decode_kernel_sizes,
383			strides=strides,
384			padding=padding,
385			out_kernel_initializer=out_kernel_initializer,
386			out_activation=out_activation,
387			out_channels=out_channels,
388			)
389
390			def build_encode_layers(
391			self,
392			image_size: Tuple,
393			num_channels: Tuple,
394			depth: int,
395			encode_kernel_sizes: Union[int, List[int]],
396			strides: int,
397			padding: str,
398			) -> List[Tuple]:
399			"""
400			Build layers for encoding.
401
402			:param image_size: (dim1, dim2, dim3).
403			:param num_channels: number of channels for each layer,
404			starting from the top layer.
405			:param depth: network starts with d = 0, and the bottom has d = depth.
406			:param encode_kernel_sizes: kernel size for down-sampling
407			:param strides: strides for down-sampling
408			:param padding: padding mode for all conv layers
409			:return: list of tensor shapes starting from d = 0
410			"""
411			if isinstance(encode_kernel_sizes, int):
412			encode_kernel_sizes = [encode_kernel_sizes] * (depth + 1)
413			assert len(encode_kernel_sizes) == depth + 1
414
415			# encoding / down-sampling
416			self._encode_convs = []
417			self._encode_pools = []
418			tensor_shape = image_size
419			tensor_shapes = [tensor_shape]
420			for d in range(depth):
421			encode_conv = self.build_encode_conv_block(
422			filters=num_channels[d],
423			kernel_size=encode_kernel_sizes[d],
424			padding=padding,
425			)
426			encode_pool = self.build_down_sampling_block(
427			filters=num_channels[d],
428			kernel_size=strides,
429			strides=strides,
430			padding=padding,
431			)
432			tensor_shape = tuple(
433			conv_utils.conv_output_length(
434			input_length=x,
435			filter_size=strides,
436			padding=padding,
437			stride=strides,
438			dilation=1,
439			)
440			for x in tensor_shape
441			)
442			self._encode_convs.append(encode_conv)
443			self._encode_pools.append(encode_pool)
444			tensor_shapes.append(tensor_shape)
445
446			# bottom layer
447			self._bottom_block = self.build_bottom_block(
448			filters=num_channels[depth],
449			kernel_size=encode_kernel_sizes[depth],
450			padding=padding,
451			)
452			return tensor_shapes
453
454			def build_decode_layers(
455			self,
456			tensor_shapes: List[Tuple],
457			image_size: Tuple,
458			num_channels: Tuple,
459			depth: int,
460			extract_levels: Tuple[int],
461			decode_kernel_sizes: Union[int, List[int]],
462			strides: int,
463			padding: str,
464			out_kernel_initializer: str,
465			out_activation: str,
466			out_channels: int,
467			):
468			"""
469			Build layers for decoding.
470
471			:param tensor_shapes: shapes calculated in encoder
472			:param image_size: (dim1, dim2, dim3).
473			:param num_channels: number of channels for each layer,
474			starting from the top layer.
475			:param depth: network starts with d = 0, and the bottom has d = depth.
476			:param extract_levels: from which depths the output will be built.
477			:param decode_kernel_sizes: kernel size for up-sampling
478			:param strides: strides for down-sampling
479			:param padding: padding mode for all conv layers
480			:param out_kernel_initializer: initializer to use for kernels.
481			:param out_activation: activation to use at end layer.
482			:param out_channels: number of channels for the extractions
483			"""
484			# init params
485			min_extract_level = min(extract_levels)
486			if isinstance(decode_kernel_sizes, int):
487			decode_kernel_sizes = [decode_kernel_sizes] * depth
488			assert len(decode_kernel_sizes) == depth
489
490			# decoding / up-sampling
491			self._decode_deconvs = []
492			self._decode_convs = []
493			for d in range(depth - 1, min_extract_level - 1, -1):
494			kernel_size = decode_kernel_sizes[d]
495			output_padding = layer_util.deconv_output_padding(
496			input_shape=tensor_shapes[d + 1],
497			output_shape=tensor_shapes[d],
498			kernel_size=kernel_size,
499			stride=strides,
500			padding=padding,
501			)
502			decode_deconv = self.build_up_sampling_block(
503			filters=num_channels[d],
504			output_padding=output_padding,
505			kernel_size=kernel_size,
506			strides=strides,
507			padding=padding,
508			output_shape=tensor_shapes[d],
509			)
510			decode_conv = self.build_decode_conv_block(
511			filters=num_channels[d], kernel_size=kernel_size, padding=padding
512			)
513			self._decode_deconvs = [decode_deconv] + self._decode_deconvs
514			self._decode_convs = [decode_conv] + self._decode_convs
515			if min_extract_level > 0:
516			# add Nones to make lists have length depth - 1
517			self._decode_deconvs = [None] * min_extract_level + self._decode_deconvs
518			self._decode_convs = [None] * min_extract_level + self._decode_convs
519
520			# extraction
521			self._output_block = self.build_output_block(
522			image_size=image_size,
523			extract_levels=extract_levels,
524			out_channels=out_channels,
525			out_kernel_initializer=out_kernel_initializer,
526			out_activation=out_activation,
527			)
528
529			def call(self, inputs: tf.Tensor, training=None, mask=None) -> tf.Tensor:
			0 ignored issues – show introduced 2021-01-26 01:41 UTC by Report Bug Copy Issue Report "mask, training" missing in parameter type documentation Loading history...
530			"""
531			Build compute graph based on built layers.
532
533			:param inputs: image batch, shape = (batch, f_dim1, f_dim2, f_dim3, ch)
534			:param training: None or bool.
535			:param mask: None or tf.Tensor.
536			:return: shape = (batch, f_dim1, f_dim2, f_dim3, out_channels)
537			"""
538
539			# encoding / down-sampling
540			skips = []
541			encoded = inputs
542			for d in range(self._depth):
543			skip = self._encode_convs[d](inputs=encoded, training=training)
544			encoded = self._encode_pools[d](inputs=skip, training=training)
545			skips.append(skip)
546
547			# bottom
548			decoded = self._bottom_block(inputs=encoded, training=training)
549
550			# decoding / up-sampling
551			outs = [decoded]
552			for d in range(self._depth - 1, min(self._extract_levels) - 1, -1):
553			decoded = self._decode_deconvs[d](inputs=decoded, training=training)
554			decoded = self.build_skip_block()([decoded, skips[d]])
555			decoded = self._decode_convs[d](inputs=decoded, training=training)
556			outs = [decoded] + outs
557
558			# output
559			output = self._output_block(outs)
560
561			return output
562
563			def get_config(self) -> dict:
564			"""Return the config dictionary for recreating this class."""
565			config = super().get_config()
566			config.update(
567			depth=self._depth,
568			extract_levels=self._extract_levels,
569			pooling=self._pooling,
570			concat_skip=self._concat_skip,
571			encode_kernel_sizes=self._encode_kernel_sizes,
572			decode_kernel_sizes=self._decode_kernel_sizes,
573			encode_num_channels=self._encode_num_channels,
574			decode_num_channels=self._decode_num_channels,
575			strides=self._strides,
576			padding=self._padding,
577			)
578			return config
579

DeepRegNet / DeepReg

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UNet.build_decode_conv_block() A

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