initial files for ResNet50

official/modeling/activations/gelu_test.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for the Gaussian error linear unit."""
+
+import tensorflow as tf
+
+from tensorflow.python.keras import keras_parameterized  # pylint: disable=g-direct-tensorflow-import
+from official.modeling import activations
+
+
+@keras_parameterized.run_all_keras_modes
+class GeluTest(keras_parameterized.TestCase):
+
+  def test_gelu(self):
+    expected_data = [[0.14967535, 0., -0.10032465],
+                     [-0.15880796, -0.04540223, 2.9963627]]
+    gelu_data = activations.gelu([[.25, 0, -.25], [-1, -2, 3]])
+    self.assertAllClose(expected_data, gelu_data)
+
+
+if __name__ == '__main__':
+  tf.test.main()

official/modeling/activations/relu.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Customized Relu activation."""
+
+import tensorflow as tf
+
+
+@tf.keras.utils.register_keras_serializable(package='Text')
+def relu6(features):
+  """Computes the Relu6 activation function.
+
+  Args:
+    features: A `Tensor` representing preactivation values.
+
+  Returns:
+    The activation value.
+  """
+  features = tf.convert_to_tensor(features)
+  return tf.nn.relu6(features)

official/modeling/activations/relu_test.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for the customized Relu activation."""
+
+import tensorflow as tf
+
+from tensorflow.python.keras import \
+  keras_parameterized  # pylint: disable=g-direct-tensorflow-import
+from official.modeling import activations
+
+
+@keras_parameterized.run_all_keras_modes
+class CustomizedReluTest(keras_parameterized.TestCase):
+
+  def test_relu6(self):
+    features = [[.25, 0, -.25], [-1, -2, 3]]
+    customized_relu6_data = activations.relu6(features)
+    relu6_data = tf.nn.relu6(features)
+    self.assertAllClose(customized_relu6_data, relu6_data)
+
+
+if __name__ == '__main__':
+  tf.test.main()

official/modeling/activations/sigmoid.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Customized Sigmoid activation."""
+
+import tensorflow as tf
+
+
+@tf.keras.utils.register_keras_serializable(package='Text')
+def hard_sigmoid(features):
+  """Computes the hard sigmoid activation function.
+
+  Args:
+    features: A `Tensor` representing preactivation values.
+
+  Returns:
+    The activation value.
+  """
+  features = tf.convert_to_tensor(features)
+  return tf.nn.relu6(features + tf.cast(3., features.dtype)) * 0.16667

official/modeling/activations/sigmoid_test.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for the customized Sigmoid activation."""
+
+import numpy as np
+import tensorflow as tf
+
+from tensorflow.python.keras import \
+  keras_parameterized  # pylint: disable=g-direct-tensorflow-import
+from official.modeling import activations
+
+
+@keras_parameterized.run_all_keras_modes
+class CustomizedSigmoidTest(keras_parameterized.TestCase):
+
+  def _hard_sigmoid_nn(self, x):
+    x = np.float32(x)
+    return tf.nn.relu6(x + 3.) * 0.16667
+
+  def test_hard_sigmoid(self):
+    features = [[.25, 0, -.25], [-1, -2, 3]]
+    customized_hard_sigmoid_data = activations.hard_sigmoid(features)
+    sigmoid_data = self._hard_sigmoid_nn(features)
+    self.assertAllClose(customized_hard_sigmoid_data, sigmoid_data)
+
+
+if __name__ == '__main__':
+  tf.test.main()

official/modeling/activations/swish.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Customized Swish activation."""
+
+import tensorflow as tf
+
+
+@tf.keras.utils.register_keras_serializable(package='Text')
+def simple_swish(features):
+  """Computes the Swish activation function.
+
+  The tf.nn.swish operation uses a custom gradient to reduce memory usage.
+  Since saving custom gradients in SavedModel is currently not supported, and
+  one would not be able to use an exported TF-Hub module for fine-tuning, we
+  provide this wrapper that can allow to select whether to use the native
+  TensorFlow swish operation, or whether to use a customized operation that
+  has uses default TensorFlow gradient computation.
+
+  Args:
+    features: A `Tensor` representing preactivation values.
+
+  Returns:
+    The activation value.
+  """
+  features = tf.convert_to_tensor(features)
+  return features * tf.nn.sigmoid(features)
+
+
+@tf.keras.utils.register_keras_serializable(package='Text')
+def hard_swish(features):
+  """Computes a hard version of the swish function.
+
+  This operation can be used to reduce computational cost and improve
+  quantization for edge devices.
+
+  Args:
+    features: A `Tensor` representing preactivation values.
+
+  Returns:
+    The activation value.
+  """
+  features = tf.convert_to_tensor(features)
+  fdtype = features.dtype
+  return features * tf.nn.relu6(features + tf.cast(3., fdtype)) * (1. / 6.)
+
+
+@tf.keras.utils.register_keras_serializable(package='Text')
+def identity(features):
+  """Computes the identity function.
+
+  Useful for helping in quantization.
+
+  Args:
+    features: A `Tensor` representing preactivation values.
+
+  Returns:
+    The activation value.
+  """
+  features = tf.convert_to_tensor(features)
+  return tf.identity(features)

official/modeling/activations/swish_test.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for the customized Swish activation."""
+import numpy as np
+import tensorflow as tf
+
+from tensorflow.python.keras import keras_parameterized  # pylint: disable=g-direct-tensorflow-import
+from official.modeling import activations
+
+
+@keras_parameterized.run_all_keras_modes
+class CustomizedSwishTest(keras_parameterized.TestCase):
+
+  def _hard_swish_np(self, x):
+    x = np.float32(x)
+    return x * np.clip(x + 3, 0, 6) / 6
+
+  def test_simple_swish(self):
+    features = [[.25, 0, -.25], [-1, -2, 3]]
+    customized_swish_data = activations.simple_swish(features)
+    swish_data = tf.nn.swish(features)
+    self.assertAllClose(customized_swish_data, swish_data)
+
+  def test_hard_swish(self):
+    features = [[.25, 0, -.25], [-1, -2, 3]]
+    customized_swish_data = activations.hard_swish(features)
+    swish_data = self._hard_swish_np(features)
+    self.assertAllClose(customized_swish_data, swish_data)
+
+
+if __name__ == '__main__':
+  tf.test.main()

official/modeling/hyperparams/__init__.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Hyperparams package definition."""
+# pylint: disable=g-multiple-import
+from official.modeling.hyperparams.base_config import *
+from official.modeling.hyperparams.oneof import *
+from official.modeling.hyperparams.params_dict import *
+

official/modeling/hyperparams/oneof.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Config class that supports oneof functionality."""
+
+from typing import Optional
+
+import dataclasses
+from official.modeling.hyperparams import base_config
+
+
+@dataclasses.dataclass
+class OneOfConfig(base_config.Config):
+  """Configuration for configs with one of feature.
+
+  Attributes:
+    type: 'str', name of the field to select.
+  """
+  type: Optional[str] = None
+
+  def as_dict(self):
+    """Returns a dict representation of OneOfConfig.
+
+    For the nested base_config.Config, a nested dict will be returned.
+    """
+    if self.type is None:
+      return {'type': None}
+    elif self.__dict__['type'] not in self.__dict__:
+      raise ValueError('type: {!r} is not a valid key!'.format(
+          self.__dict__['type']))
+    else:
+      chosen_type = self.type
+      chosen_value = self.__dict__[chosen_type]
+      return {'type': self.type, chosen_type: self._export_config(chosen_value)}
+
+  def get(self):
+    """Returns selected config based on the value of type.
+
+    If type is not set (None), None is returned.
+    """
+    chosen_type = self.type
+    if chosen_type is None:
+      return None
+    if chosen_type not in self.__dict__:
+      raise ValueError('type: {!r} is not a valid key!'.format(self.type))
+    return self.__dict__[chosen_type]

official/modeling/multitask/__init__.py

+# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+