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# Copyright 2023 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 nn_layers."""
# Import libraries
from absl.testing import parameterized
import tensorflow as tf, tf_keras
from official.vision.modeling.layers import nn_layers
class NNLayersTest(parameterized.TestCase, tf.test.TestCase):
def test_scale(self):
scale = nn_layers.Scale(initializer=tf_keras.initializers.constant(10.))
output = scale(3.)
self.assertAllEqual(output, 30.)
def test_temporal_softmax_pool(self):
inputs = tf.range(4, dtype=tf.float32) + 1.
inputs = tf.reshape(inputs, [1, 4, 1, 1, 1])
layer = nn_layers.TemporalSoftmaxPool()
output = layer(inputs)
self.assertAllClose(
output,
[[[[[0.10153633]]],
[[[0.33481020]]],
[[[0.82801306]]],
[[[1.82021690]]]]])
def test_positional_encoding(self):
pos_encoding = nn_layers.PositionalEncoding(
initializer='ones', cache_encoding=False)
pos_encoding_cached = nn_layers.PositionalEncoding(
initializer='ones', cache_encoding=True)
inputs = tf.ones([1, 4, 1, 1, 3])
outputs, _ = pos_encoding(inputs)
outputs_cached, _ = pos_encoding_cached(inputs)
expected = tf.constant(
[[[[[1.0000000, 1.0000000, 2.0000000]]],
[[[1.8414710, 1.0021545, 1.5403023]]],
[[[1.9092975, 1.0043088, 0.5838531]]],
[[[1.1411200, 1.0064633, 0.0100075]]]]])
self.assertEqual(outputs.shape, expected.shape)
self.assertAllClose(outputs, expected)
self.assertEqual(outputs.shape, outputs_cached.shape)
self.assertAllClose(outputs, outputs_cached)
inputs = tf.ones([1, 5, 1, 1, 3])
_ = pos_encoding(inputs)
def test_positional_encoding_bfloat16(self):
pos_encoding = nn_layers.PositionalEncoding(initializer='ones')
inputs = tf.ones([1, 4, 1, 1, 3], dtype=tf.bfloat16)
outputs, _ = pos_encoding(inputs)
expected = tf.constant(
[[[[[1.0000000, 1.0000000, 2.0000000]]],
[[[1.8414710, 1.0021545, 1.5403023]]],
[[[1.9092975, 1.0043088, 0.5838531]]],
[[[1.1411200, 1.0064633, 0.0100075]]]]])
self.assertEqual(outputs.shape, expected.shape)
self.assertAllClose(outputs, expected)
def test_global_average_pool_basic(self):
pool = nn_layers.GlobalAveragePool3D(keepdims=True)
inputs = tf.ones([1, 2, 3, 4, 1])
outputs = pool(inputs, output_states=False)
expected = tf.ones([1, 1, 1, 1, 1])
self.assertEqual(outputs.shape, expected.shape)
self.assertAllEqual(outputs, expected)
def test_positional_encoding_stream(self):
pos_encoding = nn_layers.PositionalEncoding(
initializer='ones', cache_encoding=False)
inputs = tf.range(4, dtype=tf.float32) + 1.
inputs = tf.reshape(inputs, [1, 4, 1, 1, 1])
inputs = tf.tile(inputs, [1, 1, 1, 1, 3])
expected, _ = pos_encoding(inputs)
for num_splits in [1, 2, 4]:
frames = tf.split(inputs, num_splits, axis=1)
states = {}
predicted = []
for frame in frames:
output, states = pos_encoding(frame, states=states)
predicted.append(output)
predicted = tf.concat(predicted, axis=1)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
self.assertAllClose(predicted, [[[[[1.0000000, 1.0000000, 2.0000000]]],
[[[2.8414710, 2.0021544, 2.5403023]]],
[[[3.9092975, 3.0043090, 2.5838532]]],
[[[4.1411200, 4.0064630, 3.0100074]]]]])
def test_global_average_pool_keras(self):
pool = nn_layers.GlobalAveragePool3D(keepdims=False)
keras_pool = tf_keras.layers.GlobalAveragePooling3D()
inputs = 10 * tf.random.normal([1, 2, 3, 4, 1])
outputs = pool(inputs, output_states=False)
keras_output = keras_pool(inputs)
self.assertAllEqual(outputs.shape, keras_output.shape)
self.assertAllClose(outputs, keras_output)
def test_stream_global_average_pool(self):
gap = nn_layers.GlobalAveragePool3D(keepdims=True, causal=False)
inputs = tf.range(4, dtype=tf.float32) + 1.
inputs = tf.reshape(inputs, [1, 4, 1, 1, 1])
inputs = tf.tile(inputs, [1, 1, 2, 2, 3])
expected, _ = gap(inputs, output_states=True)
for num_splits in [1, 2, 4]:
frames = tf.split(inputs, num_splits, axis=1)
states = {}
predicted = None
for frame in frames:
predicted, states = gap(frame, states=states, output_states=True)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
self.assertAllClose(
predicted,
[[[[[2.5, 2.5, 2.5]]]]])
def test_causal_stream_global_average_pool(self):
gap = nn_layers.GlobalAveragePool3D(keepdims=True, causal=True)
inputs = tf.range(4, dtype=tf.float32) + 1.
inputs = tf.reshape(inputs, [1, 4, 1, 1, 1])
inputs = tf.tile(inputs, [1, 1, 2, 2, 3])
expected, _ = gap(inputs, output_states=True)
for num_splits in [1, 2, 4]:
frames = tf.split(inputs, num_splits, axis=1)
states = {}
predicted = []
for frame in frames:
x, states = gap(frame, states=states, output_states=True)
predicted.append(x)
predicted = tf.concat(predicted, axis=1)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
self.assertAllClose(
predicted,
[[[[[1.0, 1.0, 1.0]]],
[[[1.5, 1.5, 1.5]]],
[[[2.0, 2.0, 2.0]]],
[[[2.5, 2.5, 2.5]]]]])
def test_spatial_average_pool(self):
pool = nn_layers.SpatialAveragePool3D(keepdims=True)
inputs = tf.range(64, dtype=tf.float32) + 1.
inputs = tf.reshape(inputs, [1, 4, 4, 4, 1])
output = pool(inputs)
self.assertEqual(output.shape, [1, 4, 1, 1, 1])
self.assertAllClose(
output,
[[[[[8.50]]],
[[[24.5]]],
[[[40.5]]],
[[[56.5]]]]])
def test_conv2d_causal(self):
conv2d = nn_layers.Conv2D(
filters=3,
kernel_size=(3, 3),
strides=(1, 2),
padding='causal',
use_buffered_input=True,
kernel_initializer='ones',
use_bias=False,
)
inputs = tf.ones([1, 4, 2, 3])
paddings = [[0, 0], [2, 0], [0, 0], [0, 0]]
padded_inputs = tf.pad(inputs, paddings)
predicted = conv2d(padded_inputs)
expected = tf.constant(
[[[[6.0, 6.0, 6.0]],
[[12., 12., 12.]],
[[18., 18., 18.]],
[[18., 18., 18.]]]])
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
conv2d.use_buffered_input = False
predicted = conv2d(inputs)
self.assertFalse(conv2d.use_buffered_input)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
def test_depthwise_conv2d_causal(self):
conv2d = nn_layers.DepthwiseConv2D(
kernel_size=(3, 3),
strides=(1, 1),
padding='causal',
use_buffered_input=True,
depthwise_initializer='ones',
use_bias=False,
)
inputs = tf.ones([1, 2, 2, 3])
paddings = [[0, 0], [2, 0], [0, 0], [0, 0]]
padded_inputs = tf.pad(inputs, paddings)
predicted = conv2d(padded_inputs)
expected = tf.constant(
[[[[2., 2., 2.],
[2., 2., 2.]],
[[4., 4., 4.],
[4., 4., 4.]]]])
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
conv2d.use_buffered_input = False
predicted = conv2d(inputs)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
def test_conv3d_causal(self):
conv3d = nn_layers.Conv3D(
filters=3,
kernel_size=(3, 3, 3),
strides=(1, 2, 2),
padding='causal',
use_buffered_input=True,
kernel_initializer='ones',
use_bias=False,
)
inputs = tf.ones([1, 2, 4, 4, 3])
paddings = [[0, 0], [2, 0], [0, 0], [0, 0], [0, 0]]
padded_inputs = tf.pad(inputs, paddings)
predicted = conv3d(padded_inputs)
expected = tf.constant(
[[[[[27., 27., 27.],
[18., 18., 18.]],
[[18., 18., 18.],
[12., 12., 12.]]],
[[[54., 54., 54.],
[36., 36., 36.]],
[[36., 36., 36.],
[24., 24., 24.]]]]])
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
conv3d.use_buffered_input = False
predicted = conv3d(inputs)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
def test_depthwise_conv3d_causal(self):
conv3d = nn_layers.Conv3D(
filters=3,
kernel_size=(3, 3, 3),
strides=(1, 2, 2),
padding='causal',
use_buffered_input=True,
kernel_initializer='ones',
use_bias=False,
groups=3,
)
inputs = tf.ones([1, 2, 4, 4, 3])
paddings = [[0, 0], [2, 0], [0, 0], [0, 0], [0, 0]]
padded_inputs = tf.pad(inputs, paddings)
predicted = conv3d(padded_inputs)
expected = tf.constant(
[[[[[9.0, 9.0, 9.0],
[6.0, 6.0, 6.0]],
[[6.0, 6.0, 6.0],
[4.0, 4.0, 4.0]]],
[[[18.0, 18.0, 18.0],
[12., 12., 12.]],
[[12., 12., 12.],
[8., 8., 8.]]]]])
output_shape = conv3d._spatial_output_shape([4, 4, 4])
self.assertAllClose(output_shape, [2, 2, 2])
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
conv3d.use_buffered_input = False
predicted = conv3d(inputs)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
def test_conv3d_causal_padding_2d(self):
"""Test to ensure causal padding works like standard padding."""
conv3d = nn_layers.Conv3D(
filters=1,
kernel_size=(1, 3, 3),
strides=(1, 2, 2),
padding='causal',
use_buffered_input=False,
kernel_initializer='ones',
use_bias=False,
)
keras_conv3d = tf_keras.layers.Conv3D(
filters=1,
kernel_size=(1, 3, 3),
strides=(1, 2, 2),
padding='same',
kernel_initializer='ones',
use_bias=False,
)
inputs = tf.ones([1, 1, 4, 4, 1])
predicted = conv3d(inputs)
expected = keras_conv3d(inputs)
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
self.assertAllClose(predicted,
[[[[[9.],
[6.]],
[[6.],
[4.]]]]])
def test_conv3d_causal_padding_1d(self):
"""Test to ensure causal padding works like standard padding."""
conv3d = nn_layers.Conv3D(
filters=1,
kernel_size=(3, 1, 1),
strides=(2, 1, 1),
padding='causal',
use_buffered_input=False,
kernel_initializer='ones',
use_bias=False,
)
keras_conv1d = tf_keras.layers.Conv1D(
filters=1,
kernel_size=3,
strides=2,
padding='causal',
kernel_initializer='ones',
use_bias=False,
)
inputs = tf.ones([1, 4, 1, 1, 1])
predicted = conv3d(inputs)
expected = keras_conv1d(tf.squeeze(inputs, axis=[2, 3]))
expected = tf.reshape(expected, [1, 2, 1, 1, 1])
self.assertEqual(predicted.shape, expected.shape)
self.assertAllClose(predicted, expected)
self.assertAllClose(predicted,
[[[[[1.]]],
[[[3.]]]]])
@parameterized.parameters(
(None, []),
(None, [6, 12, 18]),
([32, 32], [6, 12, 18]),
)
def test_aspp(self, pool_kernel_size, dilation_rates):
inputs = tf_keras.Input(shape=(64, 64, 128), dtype=tf.float32)
layer = nn_layers.SpatialPyramidPooling(
output_channels=256,
dilation_rates=dilation_rates,
pool_kernel_size=pool_kernel_size)
output = layer(inputs)
self.assertAllEqual([None, 64, 64, 256], output.shape)
@parameterized.parameters(None, 2)
def test_multi_head_attention(self, max_inference_parallelism):
layer = nn_layers.MultiHeadAttention(
num_heads=12,
key_dim=64,
max_inference_parallelism=max_inference_parallelism,
)
# Create a 3-dimensional input (the first dimension is implicit).
query = tf_keras.Input(shape=(40, 80))
value = tf_keras.Input(shape=(20, 80))
output = layer(query=query, value=value)
self.assertEqual(output.shape.as_list(), [None, 40, 80])
if __name__ == '__main__':
tf.test.main()
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