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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 the attention layer."""
from absl.testing import parameterized
import numpy as np
import tensorflow as tf, tf_keras
from official.nlp.modeling.layers import reuse_attention as attention
class ReuseMultiHeadAttentionTest(tf.test.TestCase, parameterized.TestCase):
@parameterized.named_parameters(
("key_value_same_proj", None, None, [40, 80]),
("key_value_different_proj", 32, 60, [40, 60]),
)
def test_non_masked_attention(self, value_dim, output_shape, output_dims):
"""Test that the attention layer can be created without a mask tensor."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=12,
key_dim=64,
value_dim=value_dim,
output_shape=output_shape)
# 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 = test_layer(query=query, value=value)
self.assertEqual(output.shape.as_list(), [None] + output_dims)
def test_non_masked_self_attention(self):
"""Test with one input (self-attenntion) and no mask tensor."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=12, key_dim=64)
# Create a 3-dimensional input (the first dimension is implicit).
query = tf_keras.Input(shape=(40, 80))
output = test_layer(query, query)
self.assertEqual(output.shape.as_list(), [None, 40, 80])
def test_attention_scores(self):
"""Test attention outputs with coefficients."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=12, key_dim=64)
# Create a 3-dimensional input (the first dimension is implicit).
query = tf_keras.Input(shape=(40, 80))
output, coef = test_layer(query, query, return_attention_scores=True)
self.assertEqual(output.shape.as_list(), [None, 40, 80])
self.assertEqual(coef.shape.as_list(), [None, 12, 40, 40])
def test_attention_scores_with_values(self):
"""Test attention outputs with coefficients."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=12, key_dim=64)
# Create a 3-dimensional input (the first dimension is implicit).
query = tf_keras.Input(shape=(40, 80))
value = tf_keras.Input(shape=(60, 80))
output, coef = test_layer(query, value, return_attention_scores=True)
self.assertEqual(output.shape.as_list(), [None, 40, 80])
self.assertEqual(coef.shape.as_list(), [None, 12, 40, 60])
@parameterized.named_parameters(
("with_bias", True, 0), ("no_bias", False, 0),
("reuse_all_with_bias", True, -1), ("reuse_all_no_bias", False, -1),
("reuse_partial_with_bias", True, 1),
("reuse_partial_no_bias", False, 1))
def test_masked_attention(self, use_bias, reuse_attention):
"""Test with a mask tensor."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=2, key_dim=2, use_bias=use_bias,
reuse_attention=reuse_attention)
# Create a 3-dimensional input (the first dimension is implicit).
batch_size = 3
query = tf_keras.Input(shape=(4, 8))
value = tf_keras.Input(shape=(2, 8))
mask_tensor = tf_keras.Input(shape=(4, 2))
reuse_attention_scores = tf_keras.Input(shape=(2, 4, 2))
output = test_layer(query=query, value=value, attention_mask=mask_tensor,
reuse_attention_scores=reuse_attention_scores)
# Create a model containing the test layer.
model = tf_keras.Model(
[query, value, mask_tensor, reuse_attention_scores], output)
# Generate data for the input (non-mask) tensors.
from_data = 10 * np.random.random_sample((batch_size, 4, 8))
to_data = 10 * np.random.random_sample((batch_size, 2, 8))
reuse_scores = np.random.random_sample((batch_size, 2, 4, 2))
# Invoke the data with a random set of mask data. This should mask at least
# one element.
mask_data = np.random.randint(2, size=(batch_size, 4, 2))
masked_output_data = model.predict(
[from_data, to_data, mask_data, reuse_scores])
# Invoke the same data, but with a null mask (where no elements are masked).
null_mask_data = np.ones((batch_size, 4, 2))
unmasked_output_data = model.predict(
[from_data, to_data, null_mask_data, reuse_scores])
# Because one data is masked and one is not, the outputs should not be the
# same.
if reuse_attention == -1:
self.assertAllEqual(masked_output_data, unmasked_output_data)
else:
self.assertNotAllClose(masked_output_data, unmasked_output_data)
# Tests the layer with three inputs: Q, K, V.
key = tf_keras.Input(shape=(2, 8))
output = test_layer(query, value=value, key=key, attention_mask=mask_tensor,
reuse_attention_scores=reuse_attention_scores)
model = tf_keras.Model(
[query, value, key, mask_tensor, reuse_attention_scores], output)
masked_output_data = model.predict(
[from_data, to_data, to_data, mask_data, reuse_scores])
unmasked_output_data = model.predict(
[from_data, to_data, to_data, null_mask_data, reuse_scores])
# Because one data is masked and one is not, the outputs should not be the
# same.
if reuse_attention == -1:
self.assertAllEqual(masked_output_data, unmasked_output_data)
else:
self.assertNotAllClose(masked_output_data, unmasked_output_data)
if reuse_attention > 0:
self.assertLen(test_layer._output_dense, 2)
if use_bias:
if reuse_attention == 0:
self.assertLen(test_layer._query_dense.trainable_variables, 2)
self.assertLen(test_layer._output_dense[0].trainable_variables, 2)
if len(test_layer._output_dense) == 2:
self.assertLen(test_layer._output_dense[1].trainable_variables, 1)
else:
if reuse_attention == 0:
self.assertLen(test_layer._query_dense.trainable_variables, 1)
self.assertLen(test_layer._output_dense[0].trainable_variables, 1)
if len(test_layer._output_dense) == 2:
self.assertLen(test_layer._output_dense[1].trainable_variables, 1)
def test_initializer(self):
"""Test with a specified initializer."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=12,
key_dim=64,
kernel_initializer=tf_keras.initializers.TruncatedNormal(stddev=0.02))
# Create a 3-dimensional input (the first dimension is implicit).
query = tf_keras.Input(shape=(40, 80))
output = test_layer(query, query)
self.assertEqual(output.shape.as_list(), [None, 40, 80])
def test_masked_attention_with_scores(self):
"""Test with a mask tensor."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=2, key_dim=2)
# Create a 3-dimensional input (the first dimension is implicit).
batch_size = 3
query = tf_keras.Input(shape=(4, 8))
value = tf_keras.Input(shape=(2, 8))
mask_tensor = tf_keras.Input(shape=(4, 2))
output = test_layer(query=query, value=value, attention_mask=mask_tensor)
# Create a model containing the test layer.
model = tf_keras.Model([query, value, mask_tensor], output)
# Generate data for the input (non-mask) tensors.
from_data = 10 * np.random.random_sample((batch_size, 4, 8))
to_data = 10 * np.random.random_sample((batch_size, 2, 8))
# Invoke the data with a random set of mask data. This should mask at least
# one element.
mask_data = np.random.randint(2, size=(batch_size, 4, 2))
masked_output_data = model.predict([from_data, to_data, mask_data])
# Invoke the same data, but with a null mask (where no elements are masked).
null_mask_data = np.ones((batch_size, 4, 2))
unmasked_output_data = model.predict([from_data, to_data, null_mask_data])
# Because one data is masked and one is not, the outputs should not be the
# same.
self.assertNotAllClose(masked_output_data, unmasked_output_data)
# Create a model containing attention scores.
output, scores = test_layer(
query=query, value=value, attention_mask=mask_tensor,
return_attention_scores=True)
model = tf_keras.Model([query, value, mask_tensor], [output, scores])
masked_output_data_score, masked_score = model.predict(
[from_data, to_data, mask_data])
unmasked_output_data_score, unmasked_score = model.predict(
[from_data, to_data, null_mask_data])
self.assertNotAllClose(masked_output_data_score, unmasked_output_data_score)
self.assertAllClose(masked_output_data, masked_output_data_score)
self.assertAllClose(unmasked_output_data, unmasked_output_data_score)
self.assertNotAllClose(masked_score, unmasked_score)
@parameterized.named_parameters(
("4d_inputs_1freebatch_mask2", [3, 4], [3, 2], [4, 2],
(2,)), ("4d_inputs_1freebatch_mask3", [3, 4], [3, 2], [3, 4, 2], (2,)),
("4d_inputs_1freebatch_mask4", [3, 4], [3, 2], [3, 2, 4, 2],
(2,)), ("4D_inputs_2D_attention", [3, 4], [3, 2], [3, 4, 3, 2], (1, 2)),
("5D_inputs_2D_attention", [5, 3, 4], [5, 3, 2], [3, 4, 3, 2], (2, 3)),
("5D_inputs_2D_attention_fullmask", [5, 3, 4], [5, 3, 2], [5, 3, 4, 3, 2],
(2, 3)))
def test_high_dim_attention(self, q_dims, v_dims, mask_dims, attention_axes):
"""Test with a mask tensor."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=2, key_dim=2, attention_axes=attention_axes)
batch_size, hidden_size = 3, 8
# Generate data for the input (non-mask) tensors.
query_shape = [batch_size] + q_dims + [hidden_size]
value_shape = [batch_size] + v_dims + [hidden_size]
mask_shape = [batch_size] + mask_dims
query = 10 * np.random.random_sample(query_shape)
value = 10 * np.random.random_sample(value_shape)
# Invoke the data with a random set of mask data. This should mask at least
# one element.
mask_data = np.random.randint(2, size=mask_shape).astype("bool")
# Invoke the same data, but with a null mask (where no elements are masked).
null_mask_data = np.ones(mask_shape)
# Because one data is masked and one is not, the outputs should not be the
# same.
query_tensor = tf_keras.Input(query_shape[1:], name="query")
value_tensor = tf_keras.Input(value_shape[1:], name="value")
mask_tensor = tf_keras.Input(mask_shape[1:], name="mask")
output = test_layer(query=query_tensor, value=value_tensor,
attention_mask=mask_tensor)
model = tf_keras.Model([query_tensor, value_tensor, mask_tensor], output)
self.assertNotAllClose(
model.predict([query, value, mask_data]),
model.predict([query, value, null_mask_data]))
def test_dropout(self):
test_layer = attention.ReuseMultiHeadAttention(
num_heads=2, key_dim=2, dropout=0.5)
# Generate data for the input (non-mask) tensors.
from_data = tf_keras.backend.ones(shape=(32, 4, 8))
to_data = tf_keras.backend.ones(shape=(32, 2, 8))
train_out = test_layer(from_data, to_data, None, None, None, True)
test_out = test_layer(from_data, to_data, None, None, None, False)
# Output should be close when not in training mode,
# and should not be close when enabling dropout in training mode.
self.assertNotAllClose(
tf_keras.backend.eval(train_out),
tf_keras.backend.eval(test_out))
def test_non_masked_self_attention_with_reuse(self):
"""Test with one input (self-attenntion) and no mask tensor."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=12, key_dim=64, reuse_attention=True)
# Create a 3-dimensional input (the first dimension is implicit).
query = tf_keras.Input(shape=(40, 80))
reuse_scores = tf_keras.Input(shape=(12, 40, 40))
output = test_layer(query, query, reuse_attention_scores=reuse_scores)
self.assertEqual(output.shape.as_list(), [None, 40, 80])
@parameterized.named_parameters(
("no_reuse_with_pe_max_seq_length_20", False, 20),
("reuse_all_with_pe_max_seq_length_20", True, 20),
("reuse_partial_with_pe_max_seq_length_20", 5, 20),
("no_reuse_with_pe_max_seq_length_40", False, 40),
("reuse_all_with_pe_max_seq_length_40", True, 40),
("reuse_partial_with_pe_max_seq_length_40", 5, 40))
def test_non_masked_self_attention_with_relative_pe(self, reuse_attention,
pe_max_seq_length):
"""Test with one input (self-attenntion) and no mask tensor."""
test_layer = attention.ReuseMultiHeadAttention(
num_heads=12, key_dim=64, reuse_attention=reuse_attention,
use_relative_pe=True, pe_max_seq_length=pe_max_seq_length)
# Create a 3-dimensional input (the first dimension is implicit).
query = tf_keras.Input(shape=(40, 80))
reuse_scores = tf_keras.Input(shape=(12, 40, 40))
output = test_layer(query, query, reuse_attention_scores=reuse_scores)
self.assertEqual(output.shape.as_list(), [None, 40, 80])
query = tf_keras.Input(shape=(30, 80))
reuse_scores = tf_keras.Input(shape=(12, 30, 30))
output = test_layer(query, query, reuse_attention_scores=reuse_scores)
self.assertEqual(output.shape.as_list(), [None, 30, 80])
query = tf_keras.Input(shape=(30, 80))
key = tf_keras.Input(shape=(20, 80))
reuse_scores = tf_keras.Input(shape=(12, 30, 20))
output = test_layer(query, key, reuse_attention_scores=reuse_scores)
self.assertEqual(output.shape.as_list(), [None, 30, 80])
query = tf_keras.Input(shape=(50, 80))
key = tf_keras.Input(shape=(60, 80))
reuse_scores = tf_keras.Input(shape=(12, 50, 60))
output = test_layer(query, key, reuse_attention_scores=reuse_scores)
self.assertEqual(output.shape.as_list(), [None, 50, 80])
if __name__ == "__main__":
tf.test.main()
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