def testConfigWithLearningRateDecay(self):
with testing_utils.use_gpu():
var0 = tf.Variable([[1.0], [2.0]], dtype=tf.float32)
for decay_schedule in [
learning_rate_schedule.InverseTimeDecay(
0.5, decay_steps=1.0, decay_rate=0.1),
learning_rate_schedule.PiecewiseConstantDecay(
[5], [1., .5])
]:
step = 10
opt = gradient_descent.SGD(decay_schedule)
config = opt.get_config()
opt2 = gradient_descent.SGD.from_config(config)
# assert both are equal float values.
self.assertAllEqual(
decay_schedule(step),
opt._get_hyper('learning_rate')(step))
self.assertAllEqual(
decay_schedule(step),
opt2._get_hyper('learning_rate')(step))
loss = lambda: 3 * var0
# learning rate variable is created when calling minimize.
opt.minimize(loss, [var0])
self.evaluate(tf.compat.v1.global_variables_initializer())
config = opt.get_config()
opt3 = gradient_descent.SGD.from_config(config)
self.assertAllEqual(
self.evaluate(opt._get_hyper('learning_rate')(step)),
opt3._get_hyper('learning_rate')(step))
def testNoGradientsForAnyVariables_ApplyGradients(self):
for dtype in _DATA_TYPES:
with testing_utils.use_gpu():
var0 = tf.Variable([1.0, 2.0], dtype=dtype)
var1 = tf.Variable([3.0, 4.0], dtype=dtype)
sgd_op = gradient_descent.SGD(3.0)
with self.assertRaisesRegex(ValueError,
'No gradients provided for any variable'):
sgd_op.apply_gradients([(None, var0), (None, var1)])
def testGradClipNorm(self):
with testing_utils.use_gpu():
var = tf.Variable([1.0])
loss = lambda: 3 * var
opt = gradient_descent.SGD(learning_rate=1.0, clipnorm=1.0)
opt_op = opt.minimize(loss, [var])
self.evaluate(tf.compat.v1.global_variables_initializer())
self.evaluate(opt_op)
self.assertAllClose([0.], self.evaluate(var))
def testNumericEquivalenceForNesterovMomentum(self):
if tf.executing_eagerly():
self.skipTest(
'v1 optimizer does not run in eager mode')
np.random.seed(1331)
with testing_utils.use_gpu():
train_samples = 20
input_dim = 3
num_classes = 2
(x, y), _ = testing_utils.get_test_data(
train_samples=train_samples,
test_samples=10,
input_shape=(input_dim,),
num_classes=num_classes)
y = np_utils.to_categorical(y)
num_hidden = 5
model_k_v1 = testing_utils.get_small_sequential_mlp(
num_hidden=num_hidden, num_classes=num_classes, input_dim=input_dim)
model_k_v2 = testing_utils.get_small_sequential_mlp(
num_hidden=num_hidden, num_classes=num_classes, input_dim=input_dim)
model_k_v2.set_weights(model_k_v1.get_weights())
model_tf = testing_utils.get_small_sequential_mlp(
num_hidden=num_hidden, num_classes=num_classes, input_dim=input_dim)
model_tf.set_weights(model_k_v2.get_weights())
opt_k_v1 = optimizer_v1.SGD(momentum=0.9, nesterov=True)
opt_k_v2 = gradient_descent.SGD(momentum=0.9, nesterov=True)
opt_tf = tf.compat.v1.train.MomentumOptimizer(
learning_rate=0.01, momentum=0.9, use_nesterov=True)
model_k_v1.compile(
opt_k_v1,
loss='categorical_crossentropy',
metrics=[],
run_eagerly=testing_utils.should_run_eagerly())
model_k_v2.compile(
opt_k_v2,
loss='categorical_crossentropy',
metrics=[],
run_eagerly=testing_utils.should_run_eagerly())
model_tf.compile(
opt_tf,
loss='categorical_crossentropy',
metrics=[],
run_eagerly=testing_utils.should_run_eagerly())
hist_k_v1 = model_k_v1.fit(x, y, batch_size=5, epochs=10, shuffle=False)
hist_k_v2 = model_k_v2.fit(x, y, batch_size=5, epochs=10, shuffle=False)
hist_tf = model_tf.fit(x, y, batch_size=5, epochs=10, shuffle=False)
self.assertAllClose(model_k_v1.get_weights(), model_tf.get_weights())
self.assertAllClose(model_k_v1.get_weights(), model_k_v2.get_weights())
self.assertAllClose(opt_k_v1.get_weights(), opt_k_v2.get_weights())
self.assertAllClose(hist_k_v1.history['loss'], hist_tf.history['loss'])
self.assertAllClose(hist_k_v1.history['loss'], hist_k_v2.history['loss'])
def testNoGradients(self):
for dtype in _DATA_TYPES:
with testing_utils.use_gpu():
var0 = tf.Variable([1.0, 2.0], dtype=dtype)
var1 = tf.Variable([3.0, 4.0], dtype=dtype)
loss = lambda: 5 * var0 # pylint: disable=cell-var-from-loop
sgd_op = gradient_descent.SGD(3.0)
with self.assertRaisesRegex(ValueError, 'No gradients'):
# var1 has no gradient
sgd_op.minimize(loss, var_list=[var1])
def _run_test(self, kwargs, expected_output_shape):
num_samples = 2
stack_size = 3
num_col = 6
with testing_utils.use_gpu():
testing_utils.layer_test(
keras.layers.Conv1DTranspose,
kwargs=kwargs,
input_shape=(num_samples, num_col, stack_size),
expected_output_shape=expected_output_shape)
def testNoGradientsForAnyVariables_Minimize(self):
for dtype in _DATA_TYPES:
with testing_utils.use_gpu():
var0 = tf.Variable([1.0, 2.0], dtype=dtype)
var1 = tf.Variable([3.0, 4.0], dtype=dtype)
loss = lambda: tf.constant(5.0)
sgd_op = gradient_descent.SGD(3.0)
with self.assertRaisesRegex(ValueError,
'No gradients provided for any variable'):
sgd_op.minimize(loss, var_list=[var0, var1])
def test_group_conv_depthwise(self):
if tf.test.is_gpu_available(cuda_only=True):
with testing_utils.use_gpu():
inputs = tf.random.uniform(shape=(3, 27, 27, 32))
layer = keras.layers.Conv2D(32, 3, groups=32, use_bias=False)
layer.build((3, 27, 27, 32))
weights_dw = tf.reshape(layer.kernel, [3, 3, 32, 1])
expected_outputs = tf.compat.v1.nn.depthwise_conv2d(
inputs, weights_dw, strides=[1, 1, 1, 1], padding='VALID')
self.assertAllClose(layer(inputs), expected_outputs, rtol=1e-5)
def testGradGlobalClipNorm(self):
with testing_utils.use_gpu():
# l2 norm is 5.0
var1 = tf.Variable([1.0])
var2 = tf.Variable([2.0])
loss = lambda: 3 * var1 + 4 * var2
opt = gradient_descent.SGD(learning_rate=1.0, global_clipnorm=2.0)
opt_op = opt.minimize(loss, [var1, var2])
self.evaluate(tf.compat.v1.global_variables_initializer())
self.evaluate(opt_op)
# grad1 = 3.0 * 2.0 / 5.0 = 1.2
self.assertAllClose([-.2], self.evaluate(var1))
# grad2 = 4.0 * 2.0 / 5.0 = 1.6
self.assertAllClose([.4], self.evaluate(var2))
def testComputeGradientsWithTensors(self):
with testing_utils.use_gpu():
x = tf.convert_to_tensor(1.0)
def f():
return x * x
sgd = gradient_descent.SGD(3.0)
grads_and_vars = sgd._compute_gradients(f, [x])
self.assertLen(grads_and_vars, 1)
grad, x_as_var = grads_and_vars[0]
self.assertIs(x, x_as_var)
self.assertEqual(2.0, self.evaluate(grad))
with self.assertRaises(NotImplementedError):
sgd.apply_gradients(grads_and_vars)
def test_group_conv(self, layer_cls, input_shape):
if tf.test.is_gpu_available(cuda_only=True):
with testing_utils.use_gpu():
inputs = tf.random.uniform(shape=input_shape)
layer = layer_cls(16, 3, groups=4, use_bias=False)
layer.build(input_shape)
input_slices = tf.split(inputs, 4, axis=-1)
weight_slices = tf.split(layer.kernel, 4, axis=-1)
expected_outputs = tf.concat([
tf.nn.convolution(inputs, weights)
for inputs, weights in zip(input_slices, weight_slices)
],
axis=-1)
self.assertAllClose(
layer(inputs), expected_outputs, rtol=3e-5, atol=3e-5)
def _testOptimizersCompatibility(self, opt_v1, opt_v2, test_weights=True):
if tf.executing_eagerly():
self.skipTest(
'v1 optimizer does not run in eager mode')
np.random.seed(1331)
with testing_utils.use_gpu():
train_samples = 20
input_dim = 3
num_classes = 2
(x, y), _ = testing_utils.get_test_data(
train_samples=train_samples,
test_samples=10,
input_shape=(input_dim,),
num_classes=num_classes)
y = np_utils.to_categorical(y)
num_hidden = 5
model_v1 = testing_utils.get_small_sequential_mlp(
num_hidden=num_hidden, num_classes=num_classes, input_dim=input_dim)
model_v1.compile(
opt_v1,
loss='categorical_crossentropy',
metrics=[],
run_eagerly=testing_utils.should_run_eagerly())
model_v1.fit(x, y, batch_size=5, epochs=1)
model_v2 = testing_utils.get_small_sequential_mlp(
num_hidden=num_hidden, num_classes=num_classes, input_dim=input_dim)
model_v2.set_weights(model_v1.get_weights())
model_v2.compile(
opt_v2,
loss='categorical_crossentropy',
metrics=[],
run_eagerly=testing_utils.should_run_eagerly())
if not tf.compat.v1.executing_eagerly_outside_functions():
model_v2._make_train_function()
if test_weights:
opt_v2.set_weights(opt_v1.get_weights())
hist_1 = model_v1.fit(x, y, batch_size=5, epochs=1, shuffle=False)
hist_2 = model_v2.fit(x, y, batch_size=5, epochs=1, shuffle=False)
self.assertAllClose(model_v1.get_weights(), model_v2.get_weights(),
rtol=1e-5, atol=1e-5)
self.assertAllClose(hist_1.history['loss'], hist_2.history['loss'],
rtol=1e-5, atol=1e-5)
def testConfig(self):
with testing_utils.use_gpu():
opt = gradient_descent.SGD(learning_rate=1.0)
config = opt.get_config()
opt2 = gradient_descent.SGD.from_config(config)
lr = opt._get_hyper('learning_rate')
lr2 = opt2._get_hyper('learning_rate')
self.evaluate(tf.compat.v1.global_variables_initializer())
# assert both are equal float values.
self.assertEqual(self.evaluate(lr), self.evaluate(lr2))
var0 = tf.Variable([[1.0], [2.0]], dtype=tf.float32)
loss = lambda: 3 * var0
# learning rate variable created when calling minimize.
opt.minimize(loss, [var0])
opt3 = gradient_descent.SGD.from_config(config)
lr3 = opt3._get_hyper('learning_rate')
self.evaluate(tf.compat.v1.global_variables_initializer())
self.assertEqual(self.evaluate(lr), self.evaluate(lr3))
def testBasic(self):
for dtype in _DATA_TYPES:
with testing_utils.use_gpu():
var0 = tf.Variable([1.0, 2.0], dtype=dtype)
var1 = tf.Variable([3.0, 4.0], dtype=dtype)
loss = lambda: 5 * var0 + 3 * var1 # pylint: disable=cell-var-from-loop
sgd = gradient_descent.SGD(3.0)
self.evaluate(tf.compat.v1.global_variables_initializer())
# Fetch params to validate initial values
self.assertAllClose([1.0, 2.0], self.evaluate(var0))
self.assertAllClose([3.0, 4.0], self.evaluate(var1))
# Run 1 step of sgd through optimizer
opt_op = sgd.minimize(loss, var_list=[var0, var1])
self.evaluate(tf.compat.v1.global_variables_initializer())
self.evaluate(opt_op)
# Validate updated params
self.assertAllClose([-14., -13.], self.evaluate(var0))
self.assertAllClose([-6., -5.], self.evaluate(var1))
def testWeights(self):
with testing_utils.use_gpu():
opt1 = adam.Adam(learning_rate=1.0)
var1 = tf.Variable([1.0, 2.0], dtype=tf.float32)
loss1 = lambda: 3 * var1
opt_op_1 = opt1.minimize(loss1, [var1])
self.evaluate(tf.compat.v1.global_variables_initializer())
config = opt1.get_config()
opt2 = adam.Adam.from_config(config)
var2 = tf.Variable([1.0, 2.0], dtype=tf.float32)
loss2 = lambda: 3 * var2
opt_op_2 = opt2.minimize(loss2, [var2])
weights = opt1.get_weights()
# Assert set_weights and both variables get updated to same value.
self.evaluate(tf.compat.v1.global_variables_initializer())
opt2.set_weights(weights)
self.evaluate([opt_op_1, opt_op_2])
self.assertAllClose(self.evaluate(var1), self.evaluate(var2))
self.assertEqual(1, self.evaluate(opt1.iterations))
self.assertEqual(1, self.evaluate(opt2.iterations))
var3 = tf.Variable([1.0, 2.0, 3.0], dtype=tf.float32)
var4 = tf.Variable([4.0, 5.0, 6.0], dtype=tf.float32)
loss3 = lambda: 3 * var3 + 5 * var4
opt_op_3 = opt1.minimize(loss3, [var3, var4])
# Assert set_weights with ValueError since weight list does not match.
self.evaluate(tf.compat.v1.global_variables_initializer())
weights = opt1.get_weights()
with self.assertRaisesRegex(ValueError, 'but the optimizer was'):
opt2.set_weights(weights)
# Assert set_weights and variables get updated to same value.
var5 = tf.Variable([1.0, 2.0, 3.0], dtype=tf.float32)
var6 = tf.Variable([4.0, 5.0, 6.0], dtype=tf.float32)
loss4 = lambda: 3 * var5 + 5 * var6
opt_op_4 = opt2.minimize(loss4, [var5, var6])
self.evaluate(tf.compat.v1.global_variables_initializer())
opt2.set_weights(weights)
self.evaluate([opt_op_3, opt_op_4])
self.assertAllClose(
self.evaluate([var3, var4]), self.evaluate([var5, var6]))
def testConstraint(self):
constraint_01 = lambda x: tf.clip_by_value(x, -0.1, 0.)
constraint_0 = lambda x: tf.clip_by_value(x, 0., 1.)
with testing_utils.use_gpu():
var0 = tf.Variable([1.0, 2.0],
constraint=constraint_01)
var1 = tf.Variable([3.0, 4.0],
constraint=constraint_0)
loss = lambda: 5 * var0 + 3 * var1
sgd = gradient_descent.SGD(3.0)
self.evaluate(tf.compat.v1.global_variables_initializer())
# Fetch params to validate initial values
self.assertAllClose([1.0, 2.0], self.evaluate(var0))
self.assertAllClose([3.0, 4.0], self.evaluate(var1))
# Run 1 step of sgd through optimizer
opt_op = sgd.minimize(loss, var_list=[var0, var1])
self.evaluate(tf.compat.v1.global_variables_initializer())
self.evaluate(opt_op)
# Validate updated params
self.assertAllClose([-0.1, -0.1], self.evaluate(var0))
self.assertAllClose([0., 0.], self.evaluate(var1))
def testPrecomputedGradient(self):
for dtype in _DATA_TYPES:
with testing_utils.use_gpu():
var0 = tf.Variable([1.0, 2.0], dtype=dtype)
var1 = tf.Variable([3.0, 4.0], dtype=dtype)
loss = lambda: 5 * var0 + 3 * var1 # pylint: disable=cell-var-from-loop
grad_loss = tf.constant([42, -42], dtype=dtype)
sgd = gradient_descent.SGD(3.0)
self.evaluate(tf.compat.v1.global_variables_initializer())
# Fetch params to validate initial values
self.assertAllClose([1.0, 2.0], self.evaluate(var0))
self.assertAllClose([3.0, 4.0], self.evaluate(var1))
# Run 1 step of sgd through optimizer
opt_op = sgd.minimize(loss, var_list=[var0, var1], grad_loss=grad_loss)
self.evaluate(tf.compat.v1.global_variables_initializer())
self.evaluate(opt_op)
# Validate updated params
self.assertAllClose([1.0 - 3 * 5 * 42.0, 2.0 - 3 * 5 * (-42.0)],
self.evaluate(var0))
self.assertAllClose([3.0 - 3 * 3 * 42.0, 4.0 - 3 * 3 * (-42.0)],
self.evaluate(var1))
def testGradientsAsVariables(self):
for i, dtype in enumerate(_DATA_TYPES):
with testing_utils.use_gpu():
var0 = tf.Variable([1.0, 2.0], dtype=dtype)
var1 = tf.Variable([3.0, 4.0], dtype=dtype)
loss = lambda: 5 * var0 + 3 * var1 # pylint: disable=cell-var-from-loop
sgd = gradient_descent.SGD(3.0)
grads_and_vars = sgd._compute_gradients(loss, [var0, var1])
# Convert gradients to tf.Variables
converted_grads = [
tf.Variable(
tf.zeros([2], dtype), name='c_%d_%d' % (i, j))
for j, gv in enumerate(grads_and_vars)
]
convert_ops = [
tf.compat.v1.assign(converted_grads[j], gv[0])
for j, gv in enumerate(grads_and_vars)
]
# Run convert_ops to achieve the gradients converting
self.evaluate(tf.compat.v1.global_variables_initializer())
self.evaluate(convert_ops)
# Fetch params to validate initial values
self.assertAllClose([1.0, 2.0], self.evaluate(var0))
self.assertAllClose([3.0, 4.0], self.evaluate(var1))
# Run 1 step of sgd through optimizer
converted_grads_and_vars = list(zip(converted_grads, [var0, var1]))
opt_op = sgd.apply_gradients(converted_grads_and_vars)
self.evaluate(tf.compat.v1.global_variables_initializer())
self.evaluate(convert_ops)
self.evaluate(opt_op)
# Validate updated params
self.assertAllClose([-14., -13.], self.evaluate(var0))
self.assertAllClose([-6., -5.], self.evaluate(var1))
def testDense(self):
# TODO(tanzheny, omalleyt): Fix test in eager mode.
for (dtype, learning_rate, rho, momentum, epsilon,
centered) in _TESTPARAMS:
with tf.compat.v1.get_default_graph().as_default(
), testing_utils.use_gpu():
# Initialize variables for numpy implementation.
var0_np = np.array([1.0, 2.0], dtype=dtype.as_numpy_dtype)
grads0_np = np.array([0.1, 0.2], dtype=dtype.as_numpy_dtype)
var1_np = np.array([3.0, 4.0], dtype=dtype.as_numpy_dtype)
grads1_np = np.array([0.01, 0.2], dtype=dtype.as_numpy_dtype)
var0 = tf.Variable(var0_np, dtype=dtype)
var1 = tf.Variable(var1_np, dtype=dtype)
grads0 = tf.constant(grads0_np, dtype=dtype)
grads1 = tf.constant(grads1_np, dtype=dtype)
opt = rmsprop.RMSprop(learning_rate=learning_rate,
rho=rho,
momentum=momentum,
epsilon=epsilon,
centered=centered)
update = opt.apply_gradients(
zip([grads0, grads1], [var0, var1]))
self.evaluate(tf.compat.v1.global_variables_initializer())
if centered:
mg0 = opt.get_slot(var0, "mg")
mg1 = opt.get_slot(var1, "mg")
else:
mg0 = None
mg1 = None
if momentum > 0.:
mom0 = opt.get_slot(var0, "momentum")
mom1 = opt.get_slot(var1, "momentum")
else:
mom0 = None
mom1 = None
rms0 = opt.get_slot(var0, "rms")
self.assertIsNotNone(rms0)
rms1 = opt.get_slot(var1, "rms")
self.assertIsNotNone(rms1)
mg0_np = np.array([0.0, 0.0], dtype=dtype.as_numpy_dtype)
mg1_np = np.array([0.0, 0.0], dtype=dtype.as_numpy_dtype)
rms0_np = np.array([0.0, 0.0], dtype=dtype.as_numpy_dtype)
rms1_np = np.array([0.0, 0.0], dtype=dtype.as_numpy_dtype)
mom0_np = np.array([0.0, 0.0], dtype=dtype.as_numpy_dtype)
mom1_np = np.array([0.0, 0.0], dtype=dtype.as_numpy_dtype)
# Fetch params to validate initial values
self.assertAllClose([1.0, 2.0], self.evaluate(var0))
self.assertAllClose([3.0, 4.0], self.evaluate(var1))
# Run 3 steps of RMSprop
for _ in range(1, 4):
self.evaluate(update)
var0_np, mg0_np, rms0_np, mom0_np = self._rmsprop_update_numpy(
var0_np, grads0_np, mg0_np, rms0_np, mom0_np,
learning_rate, rho, momentum, epsilon, centered)
var1_np, mg1_np, rms1_np, mom1_np = self._rmsprop_update_numpy(
var1_np, grads1_np, mg1_np, rms1_np, mom1_np,
learning_rate, rho, momentum, epsilon, centered)
# Validate updated params
if centered:
self.assertAllCloseAccordingToType(
mg0_np, self.evaluate(mg0))
self.assertAllCloseAccordingToType(
mg1_np, self.evaluate(mg1))
if momentum > 0.:
self.assertAllCloseAccordingToType(
mom0_np, self.evaluate(mom0))
self.assertAllCloseAccordingToType(
mom1_np, self.evaluate(mom1))
self.assertAllCloseAccordingToType(rms0_np,
self.evaluate(rms0))
self.assertAllCloseAccordingToType(rms1_np,
self.evaluate(rms1))
self.assertAllCloseAccordingToType(var0_np,
self.evaluate(var0))
self.assertAllCloseAccordingToType(var1_np,
self.evaluate(var1))
def testIterationWithoutMinimize(self):
with testing_utils.use_gpu():
sgd = gradient_descent.SGD(3.0)
self.evaluate(sgd.iterations.initializer)
self.assertEqual(0, self.evaluate(sgd.iterations))
def test_model_with_crossentropy_losses_channels_first(self):
"""Tests use of all crossentropy losses with `channels_first`.
Tests `sparse_categorical_crossentropy`, `categorical_crossentropy`,
and `binary_crossentropy`.
Verifies that evaluate gives the same result with either `channels_first`
or `channels_last` image_data_format.
"""
def prepare_simple_model(input_tensor, loss_name, target):
axis = 1 if backend.image_data_format() == 'channels_first' else -1
loss = None
num_channels = None
activation = None
if loss_name == 'sparse_categorical_crossentropy':
loss = lambda y_true, y_pred: backend.sparse_categorical_crossentropy( # pylint: disable=g-long-lambda
y_true, y_pred, axis=axis)
num_channels = int(np.amax(target) + 1)
activation = 'softmax'
elif loss_name == 'categorical_crossentropy':
loss = lambda y_true, y_pred: backend.categorical_crossentropy( # pylint: disable=g-long-lambda
y_true, y_pred, axis=axis)
num_channels = target.shape[axis]
activation = 'softmax'
elif loss_name == 'binary_crossentropy':
loss = lambda y_true, y_pred: backend.binary_crossentropy( # pylint: disable=g-long-lambda, unnecessary-lambda
y_true, y_pred)
num_channels = target.shape[axis]
activation = 'sigmoid'
predictions = Conv2D(num_channels,
1,
activation=activation,
kernel_initializer='ones',
bias_initializer='ones')(input_tensor)
simple_model = training.Model(inputs=input_tensor, outputs=predictions)
simple_model.compile(optimizer='rmsprop', loss=loss)
return simple_model
if tf.test.is_gpu_available(cuda_only=True):
with testing_utils.use_gpu():
losses_to_test = ['sparse_categorical_crossentropy',
'categorical_crossentropy', 'binary_crossentropy']
data_channels_first = np.array([[[[8., 7.1, 0.], [4.5, 2.6, 0.55],
[0.9, 4.2, 11.2]]]], dtype=np.float32)
# Labels for testing 4-class sparse_categorical_crossentropy, 4-class
# categorical_crossentropy, and 2-class binary_crossentropy:
labels_channels_first = [np.array([[[[0, 1, 3], [2, 1, 0], [2, 2, 1]]]], dtype=np.float32), # pylint: disable=line-too-long
np.array([[[[0, 1, 0], [0, 1, 0], [0, 0, 0]],
[[1, 0, 0], [0, 0, 1], [0, 1, 0]],
[[0, 0, 0], [1, 0, 0], [0, 0, 1]],
[[0, 0, 1], [0, 0, 0], [1, 0, 0]]]], dtype=np.float32), # pylint: disable=line-too-long
np.array([[[[0, 1, 0], [0, 1, 0], [0, 0, 1]],
[[1, 0, 1], [1, 0, 1], [1, 1, 0]]]], dtype=np.float32)] # pylint: disable=line-too-long
# Compute one loss for each loss function in the list `losses_to_test`:
loss_channels_last = [0., 0., 0.]
loss_channels_first = [0., 0., 0.]
old_data_format = backend.image_data_format()
# Evaluate a simple network with channels last, with all three loss
# functions:
backend.set_image_data_format('channels_last')
data = np.moveaxis(data_channels_first, 1, -1)
for index, loss_function in enumerate(losses_to_test):
labels = np.moveaxis(labels_channels_first[index], 1, -1)
inputs = input_layer.Input(shape=(3, 3, 1))
model = prepare_simple_model(inputs, loss_function, labels)
loss_channels_last[index] = model.evaluate(x=data, y=labels,
batch_size=1, verbose=0)
# Evaluate the same network with channels first, with all three loss
# functions:
backend.set_image_data_format('channels_first')
data = data_channels_first
for index, loss_function in enumerate(losses_to_test):
labels = labels_channels_first[index]
inputs = input_layer.Input(shape=(1, 3, 3))
model = prepare_simple_model(inputs, loss_function, labels)
loss_channels_first[index] = model.evaluate(x=data, y=labels,
batch_size=1, verbose=0)
backend.set_image_data_format(old_data_format)
np.testing.assert_allclose(
loss_channels_first,
loss_channels_last,
rtol=1e-06,
err_msg='{}{}'.format('Computed different losses for ',
'channels_first and channels_last'))
