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# Copyright 2020 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 Keras-based rezero-transformer block layer."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import numpy as np
import tensorflow as tf
from tensorflow.python.keras import keras_parameterized # pylint: disable=g-direct-tensorflow-import
from official.nlp.modeling.layers import rezero_transformer
# This decorator runs the test in V1, V2-Eager, and V2-Functional mode. It
# guarantees forward compatibility of this code for the V2 switchover.
@keras_parameterized.run_all_keras_modes
class TransformerWithReZeroLayerTest(keras_parameterized.TestCase):
def tearDown(self):
super(TransformerWithReZeroLayerTest, self).tearDown()
tf.keras.mixed_precision.experimental.set_policy('float32')
def test_layer_invocation_with_float16_dtype(self):
tf.keras.mixed_precision.experimental.set_policy('mixed_float16')
test_layer = rezero_transformer.ReZeroTransformer(
num_attention_heads=10,
intermediate_size=2048,
intermediate_activation='relu')
sequence_length = 21
width = 80
# Create a 3-dimensional input (the first dimension is implicit).
data_tensor = tf.keras.Input(shape=(sequence_length, width))
# Create a 2-dimensional input (the first dimension is implicit).
mask_tensor = tf.keras.Input(shape=(sequence_length, sequence_length))
output_tensor = test_layer([data_tensor, mask_tensor])
# Create a model from the test layer.
model = tf.keras.Model([data_tensor, mask_tensor], output_tensor)
# Invoke the model on test data. We can't validate the output data itself
# (the NN is too complex) but this will rule out structural runtime errors.
batch_size = 6
input_data = (10 * np.random.random_sample(
(batch_size, sequence_length, width)))
# The attention mask should be of shape (batch, from_seq_len, to_seq_len),
# which here is (batch, sequence_length, sequence_length)
mask_data = np.random.randint(
2, size=(batch_size, sequence_length, sequence_length))
_ = model.predict([input_data, mask_data])
def test_rezero_without_layer_norm(self):
test_layer = rezero_transformer.ReZeroTransformer(
num_attention_heads=10,
intermediate_size=2048,
intermediate_activation='relu',
use_layer_norm=False)
input_length, width = 16, 30
input_tensor = tf.keras.Input(shape=(input_length, width))
output_tensor = test_layer(input_tensor)
model = tf.keras.Model(input_tensor, output_tensor)
input_data = np.random.rand(2, input_length, width)
test_layer._rezero_a.assign(1.0)
test_layer.reset_rezero()
output_data = model.predict(input_data)
self.assertAllClose(input_data, output_data)
def test_rezero_with_layer_norm(self):
test_layer = rezero_transformer.ReZeroTransformer(
num_attention_heads=10,
intermediate_size=2048,
intermediate_activation='relu',
use_layer_norm=True)
input_length, width = 16, 30
input_tensor = tf.keras.Input(shape=(input_length, width))
output_tensor = test_layer(input_tensor)
model = tf.keras.Model(input_tensor, output_tensor)
input_data = np.random.rand(2, input_length, width) + 2.0
output_data = model.predict(input_data)
input_data_normed = (
input_data - np.mean(input_data, axis=-1, keepdims=True)) / (
np.std(input_data, axis=-1, keepdims=True))
self.assertAllClose(input_data_normed, output_data)
def test_layer_output_range(self):
test_layer = rezero_transformer.ReZeroTransformer(
num_attention_heads=10,
intermediate_size=2048,
intermediate_activation='relu')
sequence_length = 21
width = 80
batch_size = 6
input_data = 10 * np.random.random_sample(
(batch_size, sequence_length, width))
mask_data = np.random.randint(
2, size=(batch_size, sequence_length, sequence_length))
output_tensor = test_layer([input_data, mask_data])
# The layer only attends to the first token and outputs the first token
# embeeding.
new_layer = rezero_transformer.ReZeroTransformer(
num_attention_heads=10,
intermediate_size=2048,
intermediate_activation='relu',
output_range=1)
_ = new_layer([input_data, mask_data])
new_layer.set_weights(test_layer.get_weights())
new_output_tensor = new_layer([input_data, mask_data])
self.assertAllClose(new_output_tensor, output_tensor[:, 0:1, :])
if __name__ == '__main__':
tf.test.main()
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