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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.
"""Test Subtokenizer and string helper methods."""
import collections
import tempfile
import tensorflow as tf, tf_keras
from official.legacy.transformer.utils import tokenizer
class SubtokenizerTest(tf.test.TestCase):
def _init_subtokenizer(self, vocab_list):
temp_file = tempfile.NamedTemporaryFile(delete=False)
with tf.io.gfile.GFile(temp_file.name, "w") as w:
for subtoken in vocab_list:
w.write("'%s'" % subtoken)
w.write("\n")
return tokenizer.Subtokenizer(temp_file.name, reserved_tokens=[])
def test_encode(self):
vocab_list = ["123_", "test", "ing_"]
subtokenizer = self._init_subtokenizer(vocab_list)
s = "testing 123"
encoded_list = subtokenizer.encode(s)
self.assertEqual([1, 2, 0], encoded_list)
def test_decode(self):
vocab_list = ["123_", "test", "ing_"]
subtokenizer = self._init_subtokenizer(vocab_list)
encoded_list = [1, 2, 0] # testing 123
decoded_str = subtokenizer.decode(encoded_list)
self.assertEqual("testing 123", decoded_str)
def test_subtoken_ids_to_tokens(self):
vocab_list = ["123_", "test", "ing_"]
subtokenizer = self._init_subtokenizer(vocab_list)
encoded_list = [1, 2, 0] # testing 123
token_list = subtokenizer._subtoken_ids_to_tokens(encoded_list)
self.assertEqual([u"testing", u"123"], token_list)
class StringHelperTest(tf.test.TestCase):
def test_split_string_to_tokens(self):
text = "test? testing 123."
tokens = tokenizer._split_string_to_tokens(text,
tokenizer._ALPHANUMERIC_CHAR_SET)
self.assertEqual(["test", "? ", "testing", "123", "."], tokens)
def test_join_tokens_to_string(self):
tokens = ["test", "? ", "testing", "123", "."]
s = tokenizer._join_tokens_to_string(tokens,
tokenizer._ALPHANUMERIC_CHAR_SET)
self.assertEqual("test? testing 123.", s)
def test_escape_token(self):
token = u"abc_\\4"
alphabet = set("abc_\\u;")
escaped_token = tokenizer._escape_token(token, alphabet)
self.assertEqual("abc\\u\\\\\\52;_", escaped_token)
def test_unescape_token(self):
escaped_token = u"Underline: \\u, Backslash: \\\\, Unicode: \\52;"
unescaped_token = tokenizer._unescape_token(escaped_token)
self.assertEqual("Underline: _, Backslash: \\, Unicode: 4", unescaped_token)
def test_list_to_index_dict(self):
lst = ["test", "strings"]
d = tokenizer._list_to_index_dict(lst)
self.assertDictEqual({"test": 0, "strings": 1}, d)
def test_split_token_to_subtokens(self):
token = "abc"
subtoken_dict = {"a": 0, "b": 1, "c": 2, "ab": 3}
max_subtoken_length = 2
subtokens = tokenizer._split_token_to_subtokens(token, subtoken_dict,
max_subtoken_length)
self.assertEqual(["ab", "c"], subtokens)
def test_generate_alphabet_dict(self):
s = ["testing", "123"]
reserved_tokens = ["???"]
alphabet = tokenizer._generate_alphabet_dict(s, reserved_tokens)
self.assertIn("?", alphabet)
self.assertIn("t", alphabet)
self.assertIn("e", alphabet)
self.assertIn("s", alphabet)
self.assertIn("i", alphabet)
self.assertIn("n", alphabet)
self.assertIn("g", alphabet)
self.assertIn("1", alphabet)
self.assertIn("2", alphabet)
self.assertIn("3", alphabet)
def test_count_and_gen_subtokens(self):
token_counts = {"abc": 5}
alphabet = set("abc_")
subtoken_dict = {"a": 0, "b": 1, "c": 2, "_": 3}
max_subtoken_length = 2
subtoken_counts = tokenizer._count_and_gen_subtokens(
token_counts, alphabet, subtoken_dict, max_subtoken_length)
self.assertIsInstance(subtoken_counts, collections.defaultdict)
self.assertDictEqual(
{
"a": 5,
"b": 5,
"c": 5,
"_": 5,
"ab": 5,
"bc": 5,
"c_": 5,
"abc": 5,
"bc_": 5,
"abc_": 5
}, subtoken_counts)
def test_filter_and_bucket_subtokens(self):
subtoken_counts = collections.defaultdict(int, {
"a": 2,
"b": 4,
"c": 1,
"ab": 6,
"ac": 3,
"abbc": 5
})
min_count = 3
subtoken_buckets = tokenizer._filter_and_bucket_subtokens(
subtoken_counts, min_count)
self.assertEqual(len(subtoken_buckets[0]), 0)
self.assertEqual(set("b"), subtoken_buckets[1])
self.assertEqual(set(["ab", "ac"]), subtoken_buckets[2])
self.assertEqual(len(subtoken_buckets[3]), 0)
self.assertEqual(set(["abbc"]), subtoken_buckets[4])
def test_gen_new_subtoken_list(self):
subtoken_counts = collections.defaultdict(int, {
"translate": 10,
"t": 40,
"tr": 16,
"tra": 12
})
min_count = 5
alphabet = set("translate")
reserved_tokens = ["reserved", "tokens"]
subtoken_list, max_token_length = tokenizer._gen_new_subtoken_list(
subtoken_counts, min_count, alphabet, reserved_tokens)
# Check that "tra" isn"t in the list (its count should be decremented to 2,
# so it should not be added to the canddiate list).
self.assertNotIn("tra", subtoken_list)
self.assertIn("tr", subtoken_list)
self.assertIn("t", subtoken_list)
self.assertEqual(len("translate"), max_token_length)
def test_generate_subtokens(self):
token_counts = {"ab": 1, "bc": 3, "abc": 5}
alphabet = set("abc_")
min_count = 100
num_iterations = 1
reserved_tokens = ["reserved", "tokens"]
vocab_list = tokenizer._generate_subtokens(token_counts, alphabet,
min_count, num_iterations,
reserved_tokens)
# Check that reserved tokens are at the front of the list
self.assertEqual(vocab_list[:2], reserved_tokens)
# Check that each character in alphabet is in the vocab list
for c in alphabet:
self.assertIn(c, vocab_list)
if __name__ == "__main__":
tf.test.main()
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