test.unit.test_loss_label.TestCrossEntropy.test_smooth() - Code Metrics - Inspection of "Merge pull request #736 from DeepRegNet/734-large-..." - DeepRegNet/DeepReg - Measure and Improve Code Quality continuously with Scrutinizer

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by Yunguan

created 2021-04-05 21:38 UTC

TestCrossEntropy.test_smooth() A

↳ Parent: test.unit.test_loss_label

Complexity

Conditions

Size

Total Lines	34
Code Lines	22

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	22
dl	0
loc	34
rs	9.352
c	0
b	0
f	0
cc	1
nop	4

# coding=utf-8

"""
Tests for deepreg/model/loss/label.py in
pytest style
"""

from test.unit.util import is_equal_tf
from typing import Tuple

import numpy as np
import pytest
import tensorflow as tf

import deepreg.loss.label as label
from deepreg.constant import EPS


class TestMultiScaleLoss:
    def test_call(self):
        loss = label.MultiScaleLoss()
        with pytest.raises(NotImplementedError):
            loss.call(0, 0)

    def test_get_config(self):
        loss = label.MultiScaleLoss()
        got = loss.get_config()
        expected = dict(
            scales=None,
            kernel="gaussian",
            reduction=tf.keras.losses.Reduction.NONE,
            name="MultiScaleLoss",
        )
        assert got == expected


class TestDiceScore:
    @pytest.mark.parametrize(

        ("value", "smooth_nr", "smooth_dr", "expected"),
        [
            (0, 1e-5, 1e-5, 1),
            (0, 0, 1e-5, 0),
            (0, 1e-5, 0, np.inf),
            (0, 0, 0, np.nan),
            (0, 1e-7, 1e-7, 1),
            (1, 1e-5, 1e-5, 1),
            (1, 0, 1e-5, 1),
            (1, 1e-5, 0, 1),
            (1, 0, 0, 1),
            (1, 1e-7, 1e-7, 1),
        ],
    )
    def test_smooth(
        self,
        value: float,
        smooth_nr: float,
        smooth_dr: float,
        expected: float,
    ):
        """
        Test values in extreme cases where numerator/denominator are all zero.

        :param value: value for input.
        :param smooth_nr: constant for numerator.
        :param smooth_dr: constant for denominator.
        :param expected: target value.
        """
        shape = (1, 10)
        y_true = tf.ones(shape=shape) * value
        y_pred = tf.ones(shape=shape) * value

        got = label.DiceScore(smooth_nr=smooth_nr, smooth_dr=smooth_dr)._call(
            y_true,
            y_pred,
        )
        expected = tf.constant(expected)
        assert is_equal_tf(got[0], expected)

    @pytest.mark.parametrize("binary", [True, False])

    @pytest.mark.parametrize("background_weight", [0.0, 0.1, 0.5, 1.0])
    @pytest.mark.parametrize("shape", [(1,), (10,), (100,), (2, 3), (2, 3, 4)])
    def test_exact_value(self, binary: bool, background_weight: float, shape: Tuple):
        """
        Test dice score by comparing at ground truth values.

        :param binary: if project labels to binary values.
        :param background_weight: the weight of background class.
        :param shape: shape of input.
        """
        # init
        shape = (1,) + shape  # add batch axis
        foreground_weight = 1 - background_weight
        tf.random.set_seed(0)
        y_true = tf.random.uniform(shape=shape)
        y_pred = tf.random.uniform(shape=shape)

        # obtained value
        got = label.DiceScore(
            binary=binary,
            background_weight=background_weight,
        ).call(y_true=y_true, y_pred=y_pred)

        # expected value
        flatten = tf.keras.layers.Flatten()
        y_true = flatten(y_true)
        y_pred = flatten(y_pred)
        if binary:
            y_true = tf.cast(y_true >= 0.5, dtype=y_true.dtype)
            y_pred = tf.cast(y_pred >= 0.5, dtype=y_pred.dtype)

        num = foreground_weight * tf.reduce_sum(
            y_true * y_pred, axis=1
        ) + background_weight * tf.reduce_sum((1 - y_true) * (1 - y_pred), axis=1)
        num *= 2
        denom = foreground_weight * tf.reduce_sum(
            y_true + y_pred, axis=1
        ) + background_weight * tf.reduce_sum((1 - y_true) + (1 - y_pred), axis=1)
        expected = (num + EPS) / (denom + EPS)

        assert is_equal_tf(got, expected)

    def test_get_config(self):
        got = label.DiceScore().get_config()
        expected = dict(
            binary=False,
            background_weight=0.0,
            smooth_nr=1e-5,
            smooth_dr=1e-5,
            scales=None,
            kernel="gaussian",
            reduction=tf.keras.losses.Reduction.NONE,
            name="DiceScore",
        )
        assert got == expected

    @pytest.mark.parametrize("background_weight", [-0.1, 1.1])
    def test_background_weight_err(self, background_weight: float):
        """
        Test the error message when using wrong background weight.

        :param background_weight: weight for background class.
        """
        with pytest.raises(ValueError) as err_info:
            label.DiceScore(background_weight=background_weight)
        assert "The background weight for Dice Score must be within [0, 1]" in str(
            err_info.value
        )


class TestCrossEntropy:
    shape = (3, 3, 3, 3)

    @pytest.fixture()
    def y_true(self):
        return np.ones(shape=self.shape) * 0.6

    @pytest.fixture()
    def y_pred(self):
        return np.ones(shape=self.shape) * 0.3

    @pytest.mark.parametrize(
        ("value", "smooth", "expected"),
        [
            (0, 1e-5, 0),
            (0, 0, np.nan),
            (0, 1e-7, 0),
            (1, 1e-5, -np.log(1 + 1e-5)),
            (1, 0, 0),
            (1, 1e-7, -np.log(1 + 1e-7)),
        ],
    )
    def test_smooth(
        self,
        value: float,
        smooth: float,
        expected: float,
    ):
        """
        Test values in extreme cases where numerator/denominator are all zero.

        :param value: value for input.
        :param smooth: constant for log.
        :param expected: target value.
        """
        shape = (1, 10)
        y_true = tf.ones(shape=shape) * value
        y_pred = tf.ones(shape=shape) * value

        got = label.CrossEntropy(smooth=smooth)._call(
            y_true,
            y_pred,
        )
        expected = tf.constant(expected)
        assert is_equal_tf(got[0], expected)

    @pytest.mark.parametrize(
        "binary,background_weight,scales,expected",
        [
            (True, 0.0, None, -np.log(EPS)),
            (False, 0.0, None, -0.6 * np.log(0.3 + EPS)),
            (False, 0.2, None, -0.48 * np.log(0.3 + EPS) - 0.08 * np.log(0.7 + EPS)),
            (False, 0.2, [0, 0], -0.48 * np.log(0.3 + EPS) - 0.08 * np.log(0.7 + EPS)),
            (False, 0.2, [0, 1], 0.5239465),
        ],
    )
    def test_call(self, y_true, y_pred, binary, background_weight, scales, expected):
        expected = np.array([expected] * self.shape[0])  # call returns (batch, )
        got = label.CrossEntropy(
            binary=binary, background_weight=background_weight, scales=scales
        ).call(y_true=y_true, y_pred=y_pred)
        assert is_equal_tf(got, expected)

    def test_get_config(self):
        got = label.CrossEntropy().get_config()
        expected = dict(
            binary=False,
            background_weight=0.0,
            smooth=1e-5,
            scales=None,
            kernel="gaussian",
            reduction=tf.keras.losses.Reduction.NONE,
            name="CrossEntropy",
        )
        assert got == expected

    @pytest.mark.parametrize("background_weight", [-0.1, 1.1])
    def test_background_weight_err(self, background_weight: float):
        """
        Test the error message when using wrong background weight.

        :param background_weight: weight for background class.
        """
        with pytest.raises(ValueError) as err_info:
            label.CrossEntropy(background_weight=background_weight)
        assert "The background weight for Cross Entropy must be within [0, 1]" in str(
            err_info.value
        )


class TestJaccardIndex:
    @pytest.mark.parametrize(

        ("value", "smooth_nr", "smooth_dr", "expected"),
        [
            (0, 1e-5, 1e-5, 1),
            (0, 0, 1e-5, 0),
            (0, 1e-5, 0, np.inf),
            (0, 0, 0, np.nan),
            (0, 1e-7, 1e-7, 1),
            (1, 1e-5, 1e-5, 1),
            (1, 0, 1e-5, 1),
            (1, 1e-5, 0, 1),
            (1, 0, 0, 1),
            (1, 1e-7, 1e-7, 1),
        ],
    )
    def test_smooth(
        self,
        value: float,
        smooth_nr: float,
        smooth_dr: float,
        expected: float,
    ):
        """
        Test values in extreme cases where numerator/denominator are all zero.

        :param value: value for input.
        :param smooth_nr: constant for numerator.
        :param smooth_dr: constant for denominator.
        :param expected: target value.
        """
        shape = (1, 10)
        y_true = tf.ones(shape=shape) * value
        y_pred = tf.ones(shape=shape) * value

        got = label.JaccardIndex(smooth_nr=smooth_nr, smooth_dr=smooth_dr)._call(
            y_true,
            y_pred,
        )
        expected = tf.constant(expected)
        assert is_equal_tf(got[0], expected)

    @pytest.mark.parametrize("binary", [True, False])

    @pytest.mark.parametrize("background_weight", [0.0, 0.1, 0.5, 1.0])
    @pytest.mark.parametrize("shape", [(1,), (10,), (100,), (2, 3), (2, 3, 4)])
    def test_exact_value(self, binary: bool, background_weight: float, shape: Tuple):
        """
        Test Jaccard index by comparing at ground truth values.

        :param binary: if project labels to binary values.
        :param background_weight: the weight of background class.
        :param shape: shape of input.
        """
        # init
        shape = (1,) + shape  # add batch axis
        foreground_weight = 1 - background_weight
        tf.random.set_seed(0)
        y_true = tf.random.uniform(shape=shape)
        y_pred = tf.random.uniform(shape=shape)

        # obtained value
        got = label.JaccardIndex(
            binary=binary,
            background_weight=background_weight,
        ).call(y_true=y_true, y_pred=y_pred)

        # expected value
        flatten = tf.keras.layers.Flatten()
        y_true = flatten(y_true)
        y_pred = flatten(y_pred)
        if binary:
            y_true = tf.cast(y_true >= 0.5, dtype=y_true.dtype)
            y_pred = tf.cast(y_pred >= 0.5, dtype=y_pred.dtype)

        num = foreground_weight * tf.reduce_sum(
            y_true * y_pred, axis=1
        ) + background_weight * tf.reduce_sum((1 - y_true) * (1 - y_pred), axis=1)
        denom = foreground_weight * tf.reduce_sum(
            y_true + y_pred, axis=1
        ) + background_weight * tf.reduce_sum((1 - y_true) + (1 - y_pred), axis=1)
        denom = denom - num
        expected = (num + EPS) / (denom + EPS)

        assert is_equal_tf(got, expected)

    def test_get_config(self):
        got = label.JaccardIndex().get_config()
        expected = dict(
            binary=False,
            background_weight=0.0,
            smooth_nr=1e-5,
            smooth_dr=1e-5,
            scales=None,
            kernel="gaussian",
            reduction=tf.keras.losses.Reduction.NONE,
            name="JaccardIndex",
        )
        assert got == expected


def test_foreground_prop_binary():
    """
    Test foreground function with a
    tensor of zeros with some ones, asserting
    equal to known precomputed tensor.
    Testing with binary case.
    """
    array_eye = np.identity(3, dtype=np.float32)
    tensor_eye = np.zeros((3, 3, 3, 3), dtype=np.float32)
    tensor_eye[:, :, 0:3, 0:3] = array_eye
    expect = tf.convert_to_tensor([1.0 / 3, 1.0 / 3, 1.0 / 3], dtype=tf.float32)
    get = label.foreground_proportion(tensor_eye)
    assert is_equal_tf(get, expect)


def test_foreground_prop_simple():
    """
    Test foreground functions with a tensor
    of zeros with some ones and some values below
    one to assert the thresholding works.
    """
    array_eye = np.identity(3, dtype=np.float32)
    tensor_eye = np.zeros((3, 3, 3, 3), dtype=np.float32)
    tensor_eye[:, 0, :, :] = 0.4 * array_eye  # 0
    tensor_eye[:, 1, :, :] = array_eye
    tensor_eye[:, 2, :, :] = array_eye
    tensor_eye = tf.convert_to_tensor(tensor_eye, dtype=tf.float32)
    expect = [54 / (27 * 9), 54 / (27 * 9), 54 / (27 * 9)]
    get = label.foreground_proportion(tensor_eye)
    assert is_equal_tf(get, expect)


def test_compute_centroid():
    """
    Testing compute centroid function
    and comparing to expected values.
    """
    tensor_mask = np.zeros((3, 2, 2, 2))
    tensor_mask[0, :, :, :] = np.ones((2, 2, 2))
    tensor_mask = tf.constant(tensor_mask, dtype=tf.float32)

    tensor_grid = np.ones((1, 2, 2, 2, 3))
    tensor_grid[:, :, :, :, 1] *= 2
    tensor_grid[:, :, :, :, 2] *= 3
    tensor_grid = tf.constant(tensor_grid, dtype=tf.float32)

    expected = np.ones((3, 3))  # use 1 because 0/0 ~= (0+eps)/(0+eps) = 1
    expected[0, :] = [1, 2, 3]
    got = label.compute_centroid(tensor_mask, tensor_grid)
    assert is_equal_tf(got, expected)


def test_compute_centroid_d():
    """
    Testing compute centroid distance between equal
    tensors returns 0s.
    """
    array_ones = np.ones((2, 2))
    tensor_mask = np.zeros((3, 2, 2, 2))
    tensor_mask[0, :, :, :] = array_ones
    tensor_mask = tf.convert_to_tensor(tensor_mask, dtype=tf.float32)

    tensor_grid = np.zeros((1, 2, 2, 2, 3))
    tensor_grid[:, :, :, :, 0] = array_ones
    tensor_grid = tf.convert_to_tensor(tensor_grid, dtype=tf.float32)

    get = label.compute_centroid_distance(tensor_mask, tensor_mask, tensor_grid)
    expect = np.zeros((3))
    assert is_equal_tf(get, expect)


1		# coding=utf-8
2
3		"""
4		Tests for deepreg/model/loss/label.py in
5		pytest style
6		"""
7
8		from test.unit.util import is_equal_tf
9		from typing import Tuple
10
11		import numpy as np
12		import pytest
13		import tensorflow as tf
14
15		import deepreg.loss.label as label
16		from deepreg.constant import EPS
17
18
19		class TestMultiScaleLoss:
20		def test_call(self):
21		loss = label.MultiScaleLoss()
22		with pytest.raises(NotImplementedError):
23		loss.call(0, 0)
24
25		def test_get_config(self):
26		loss = label.MultiScaleLoss()
27		got = loss.get_config()
28		expected = dict(
29		scales=None,
30		kernel="gaussian",
31		reduction=tf.keras.losses.Reduction.NONE,
32		name="MultiScaleLoss",
33		)
34		assert got == expected
35
36
37		class TestDiceScore:
38	View Code Duplication	@pytest.mark.parametrize(
		0 ignored issues – show Duplication introduced 2021-01-26 01:41 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
39		("value", "smooth_nr", "smooth_dr", "expected"),
40		[
41		(0, 1e-5, 1e-5, 1),
42		(0, 0, 1e-5, 0),
43		(0, 1e-5, 0, np.inf),
44		(0, 0, 0, np.nan),
45		(0, 1e-7, 1e-7, 1),
46		(1, 1e-5, 1e-5, 1),
47		(1, 0, 1e-5, 1),
48		(1, 1e-5, 0, 1),
49		(1, 0, 0, 1),
50		(1, 1e-7, 1e-7, 1),
51		],
52		)
53		def test_smooth(
54		self,
55		value: float,
56		smooth_nr: float,
57		smooth_dr: float,
58		expected: float,
59		):
60		"""
61		Test values in extreme cases where numerator/denominator are all zero.
62
63		:param value: value for input.
64		:param smooth_nr: constant for numerator.
65		:param smooth_dr: constant for denominator.
66		:param expected: target value.
67		"""
68		shape = (1, 10)
69		y_true = tf.ones(shape=shape) * value
70		y_pred = tf.ones(shape=shape) * value
71
72		got = label.DiceScore(smooth_nr=smooth_nr, smooth_dr=smooth_dr)._call(
73		y_true,
74		y_pred,
75		)
76		expected = tf.constant(expected)
77		assert is_equal_tf(got[0], expected)
78
79	View Code Duplication	@pytest.mark.parametrize("binary", [True, False])
		0 ignored issues – show Duplication introduced 2021-01-26 01:41 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
80		@pytest.mark.parametrize("background_weight", [0.0, 0.1, 0.5, 1.0])
81		@pytest.mark.parametrize("shape", [(1,), (10,), (100,), (2, 3), (2, 3, 4)])
82		def test_exact_value(self, binary: bool, background_weight: float, shape: Tuple):
83		"""
84		Test dice score by comparing at ground truth values.
85
86		:param binary: if project labels to binary values.
87		:param background_weight: the weight of background class.
88		:param shape: shape of input.
89		"""
90		# init
91		shape = (1,) + shape # add batch axis
92		foreground_weight = 1 - background_weight
93		tf.random.set_seed(0)
94		y_true = tf.random.uniform(shape=shape)
95		y_pred = tf.random.uniform(shape=shape)
96
97		# obtained value
98		got = label.DiceScore(
99		binary=binary,
100		background_weight=background_weight,
101		).call(y_true=y_true, y_pred=y_pred)
102
103		# expected value
104		flatten = tf.keras.layers.Flatten()
105		y_true = flatten(y_true)
106		y_pred = flatten(y_pred)
107		if binary:
108		y_true = tf.cast(y_true >= 0.5, dtype=y_true.dtype)
109		y_pred = tf.cast(y_pred >= 0.5, dtype=y_pred.dtype)
110
111		num = foreground_weight * tf.reduce_sum(
112		y_true * y_pred, axis=1
113		) + background_weight * tf.reduce_sum((1 - y_true) * (1 - y_pred), axis=1)
114		num *= 2
115		denom = foreground_weight * tf.reduce_sum(
116		y_true + y_pred, axis=1
117		) + background_weight * tf.reduce_sum((1 - y_true) + (1 - y_pred), axis=1)
118		expected = (num + EPS) / (denom + EPS)
119
120		assert is_equal_tf(got, expected)
121
122		def test_get_config(self):
123		got = label.DiceScore().get_config()
124		expected = dict(
125		binary=False,
126		background_weight=0.0,
127		smooth_nr=1e-5,
128		smooth_dr=1e-5,
129		scales=None,
130		kernel="gaussian",
131		reduction=tf.keras.losses.Reduction.NONE,
132		name="DiceScore",
133		)
134		assert got == expected
135
136		@pytest.mark.parametrize("background_weight", [-0.1, 1.1])
137		def test_background_weight_err(self, background_weight: float):
138		"""
139		Test the error message when using wrong background weight.
140
141		:param background_weight: weight for background class.
142		"""
143		with pytest.raises(ValueError) as err_info:
144		label.DiceScore(background_weight=background_weight)
145		assert "The background weight for Dice Score must be within [0, 1]" in str(
146		err_info.value
147		)
148
149
150		class TestCrossEntropy:
151		shape = (3, 3, 3, 3)
152
153		@pytest.fixture()
154		def y_true(self):
155		return np.ones(shape=self.shape) * 0.6
156
157		@pytest.fixture()
158		def y_pred(self):
159		return np.ones(shape=self.shape) * 0.3
160
161		@pytest.mark.parametrize(
162		("value", "smooth", "expected"),
163		[
164		(0, 1e-5, 0),
165		(0, 0, np.nan),
166		(0, 1e-7, 0),
167		(1, 1e-5, -np.log(1 + 1e-5)),
168		(1, 0, 0),
169		(1, 1e-7, -np.log(1 + 1e-7)),
170		],
171		)
172		def test_smooth(
173		self,
174		value: float,
175		smooth: float,
176		expected: float,
177		):
178		"""
179		Test values in extreme cases where numerator/denominator are all zero.
180
181		:param value: value for input.
182		:param smooth: constant for log.
183		:param expected: target value.
184		"""
185		shape = (1, 10)
186		y_true = tf.ones(shape=shape) * value
187		y_pred = tf.ones(shape=shape) * value
188
189		got = label.CrossEntropy(smooth=smooth)._call(
190		y_true,
191		y_pred,
192		)
193		expected = tf.constant(expected)
194		assert is_equal_tf(got[0], expected)
195
196		@pytest.mark.parametrize(
197		"binary,background_weight,scales,expected",
198		[
199		(True, 0.0, None, -np.log(EPS)),
200		(False, 0.0, None, -0.6 * np.log(0.3 + EPS)),
201		(False, 0.2, None, -0.48 * np.log(0.3 + EPS) - 0.08 * np.log(0.7 + EPS)),
202		(False, 0.2, [0, 0], -0.48 * np.log(0.3 + EPS) - 0.08 * np.log(0.7 + EPS)),
203		(False, 0.2, [0, 1], 0.5239465),
204		],
205		)
206		def test_call(self, y_true, y_pred, binary, background_weight, scales, expected):
207		expected = np.array([expected] * self.shape[0]) # call returns (batch, )
208		got = label.CrossEntropy(
209		binary=binary, background_weight=background_weight, scales=scales
210		).call(y_true=y_true, y_pred=y_pred)
211		assert is_equal_tf(got, expected)
212
213		def test_get_config(self):
214		got = label.CrossEntropy().get_config()
215		expected = dict(
216		binary=False,
217		background_weight=0.0,
218		smooth=1e-5,
219		scales=None,
220		kernel="gaussian",
221		reduction=tf.keras.losses.Reduction.NONE,
222		name="CrossEntropy",
223		)
224		assert got == expected
225
226		@pytest.mark.parametrize("background_weight", [-0.1, 1.1])
227		def test_background_weight_err(self, background_weight: float):
228		"""
229		Test the error message when using wrong background weight.
230
231		:param background_weight: weight for background class.
232		"""
233		with pytest.raises(ValueError) as err_info:
234		label.CrossEntropy(background_weight=background_weight)
235		assert "The background weight for Cross Entropy must be within [0, 1]" in str(
236		err_info.value
237		)
238
239
240		class TestJaccardIndex:
241	View Code Duplication	@pytest.mark.parametrize(
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242		("value", "smooth_nr", "smooth_dr", "expected"),
243		[
244		(0, 1e-5, 1e-5, 1),
245		(0, 0, 1e-5, 0),
246		(0, 1e-5, 0, np.inf),
247		(0, 0, 0, np.nan),
248		(0, 1e-7, 1e-7, 1),
249		(1, 1e-5, 1e-5, 1),
250		(1, 0, 1e-5, 1),
251		(1, 1e-5, 0, 1),
252		(1, 0, 0, 1),
253		(1, 1e-7, 1e-7, 1),
254		],
255		)
256		def test_smooth(
257		self,
258		value: float,
259		smooth_nr: float,
260		smooth_dr: float,
261		expected: float,
262		):
263		"""
264		Test values in extreme cases where numerator/denominator are all zero.
265
266		:param value: value for input.
267		:param smooth_nr: constant for numerator.
268		:param smooth_dr: constant for denominator.
269		:param expected: target value.
270		"""
271		shape = (1, 10)
272		y_true = tf.ones(shape=shape) * value
273		y_pred = tf.ones(shape=shape) * value
274
275		got = label.JaccardIndex(smooth_nr=smooth_nr, smooth_dr=smooth_dr)._call(
276		y_true,
277		y_pred,
278		)
279		expected = tf.constant(expected)
280		assert is_equal_tf(got[0], expected)
281
282	View Code Duplication	@pytest.mark.parametrize("binary", [True, False])
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283		@pytest.mark.parametrize("background_weight", [0.0, 0.1, 0.5, 1.0])
284		@pytest.mark.parametrize("shape", [(1,), (10,), (100,), (2, 3), (2, 3, 4)])
285		def test_exact_value(self, binary: bool, background_weight: float, shape: Tuple):
286		"""
287		Test Jaccard index by comparing at ground truth values.
288
289		:param binary: if project labels to binary values.
290		:param background_weight: the weight of background class.
291		:param shape: shape of input.
292		"""
293		# init
294		shape = (1,) + shape # add batch axis
295		foreground_weight = 1 - background_weight
296		tf.random.set_seed(0)
297		y_true = tf.random.uniform(shape=shape)
298		y_pred = tf.random.uniform(shape=shape)
299
300		# obtained value
301		got = label.JaccardIndex(
302		binary=binary,
303		background_weight=background_weight,
304		).call(y_true=y_true, y_pred=y_pred)
305
306		# expected value
307		flatten = tf.keras.layers.Flatten()
308		y_true = flatten(y_true)
309		y_pred = flatten(y_pred)
310		if binary:
311		y_true = tf.cast(y_true >= 0.5, dtype=y_true.dtype)
312		y_pred = tf.cast(y_pred >= 0.5, dtype=y_pred.dtype)
313
314		num = foreground_weight * tf.reduce_sum(
315		y_true * y_pred, axis=1
316		) + background_weight * tf.reduce_sum((1 - y_true) * (1 - y_pred), axis=1)
317		denom = foreground_weight * tf.reduce_sum(
318		y_true + y_pred, axis=1
319		) + background_weight * tf.reduce_sum((1 - y_true) + (1 - y_pred), axis=1)
320		denom = denom - num
321		expected = (num + EPS) / (denom + EPS)
322
323		assert is_equal_tf(got, expected)
324
325		def test_get_config(self):
326		got = label.JaccardIndex().get_config()
327		expected = dict(
328		binary=False,
329		background_weight=0.0,
330		smooth_nr=1e-5,
331		smooth_dr=1e-5,
332		scales=None,
333		kernel="gaussian",
334		reduction=tf.keras.losses.Reduction.NONE,
335		name="JaccardIndex",
336		)
337		assert got == expected
338
339
340		def test_foreground_prop_binary():
341		"""
342		Test foreground function with a
343		tensor of zeros with some ones, asserting
344		equal to known precomputed tensor.
345		Testing with binary case.
346		"""
347		array_eye = np.identity(3, dtype=np.float32)
348		tensor_eye = np.zeros((3, 3, 3, 3), dtype=np.float32)
349		tensor_eye[:, :, 0:3, 0:3] = array_eye
350		expect = tf.convert_to_tensor([1.0 / 3, 1.0 / 3, 1.0 / 3], dtype=tf.float32)
351		get = label.foreground_proportion(tensor_eye)
352		assert is_equal_tf(get, expect)
353
354
355		def test_foreground_prop_simple():
356		"""
357		Test foreground functions with a tensor
358		of zeros with some ones and some values below
359		one to assert the thresholding works.
360		"""
361		array_eye = np.identity(3, dtype=np.float32)
362		tensor_eye = np.zeros((3, 3, 3, 3), dtype=np.float32)
363		tensor_eye[:, 0, :, :] = 0.4 * array_eye # 0
364		tensor_eye[:, 1, :, :] = array_eye
365		tensor_eye[:, 2, :, :] = array_eye
366		tensor_eye = tf.convert_to_tensor(tensor_eye, dtype=tf.float32)
367		expect = [54 / (27 * 9), 54 / (27 * 9), 54 / (27 * 9)]
368		get = label.foreground_proportion(tensor_eye)
369		assert is_equal_tf(get, expect)
370
371
372		def test_compute_centroid():
373		"""
374		Testing compute centroid function
375		and comparing to expected values.
376		"""
377		tensor_mask = np.zeros((3, 2, 2, 2))
378		tensor_mask[0, :, :, :] = np.ones((2, 2, 2))
379		tensor_mask = tf.constant(tensor_mask, dtype=tf.float32)
380
381		tensor_grid = np.ones((1, 2, 2, 2, 3))
382		tensor_grid[:, :, :, :, 1] *= 2
383		tensor_grid[:, :, :, :, 2] *= 3
384		tensor_grid = tf.constant(tensor_grid, dtype=tf.float32)
385
386		expected = np.ones((3, 3)) # use 1 because 0/0 ~= (0+eps)/(0+eps) = 1
387		expected[0, :] = [1, 2, 3]
388		got = label.compute_centroid(tensor_mask, tensor_grid)
389		assert is_equal_tf(got, expected)
390
391
392		def test_compute_centroid_d():
393		"""
394		Testing compute centroid distance between equal
395		tensors returns 0s.
396		"""
397		array_ones = np.ones((2, 2))
398		tensor_mask = np.zeros((3, 2, 2, 2))
399		tensor_mask[0, :, :, :] = array_ones
400		tensor_mask = tf.convert_to_tensor(tensor_mask, dtype=tf.float32)
401
402		tensor_grid = np.zeros((1, 2, 2, 2, 3))
403		tensor_grid[:, :, :, :, 0] = array_ones
404		tensor_grid = tf.convert_to_tensor(tensor_grid, dtype=tf.float32)
405
406		get = label.compute_centroid_distance(tensor_mask, tensor_mask, tensor_grid)
407		expect = np.zeros((3))
408		assert is_equal_tf(get, expect)
409

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