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test_tokenization_t5.py
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# coding=utf-8
# Copyright 2018 Google T5 Authors and HuggingFace Inc. team.
#
# 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.
import os
import unittest
from transformers import BatchEncoding
from transformers.file_utils import cached_property
from transformers.testing_utils import _torch_available
from transformers.tokenization_t5 import T5Tokenizer
from .test_tokenization_common import TokenizerTesterMixin
SPIECE_UNDERLINE = "▁"
SAMPLE_VOCAB = os.path.join(os.path.dirname(os.path.abspath(__file__)), "fixtures/test_sentencepiece.model")
FRAMEWORK = "pt" if _torch_available else "tf"
class T5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
tokenizer_class = T5Tokenizer
def setUp(self):
super().setUp()
# We have a SentencePiece fixture for testing
tokenizer = T5Tokenizer(SAMPLE_VOCAB)
tokenizer.save_pretrained(self.tmpdirname)
def test_full_tokenizer(self):
tokenizer = T5Tokenizer(SAMPLE_VOCAB)
tokens = tokenizer.tokenize("This is a test")
self.assertListEqual(tokens, ["▁This", "▁is", "▁a", "▁t", "est"])
self.assertListEqual(tokenizer.convert_tokens_to_ids(tokens), [285, 46, 10, 170, 382])
tokens = tokenizer.tokenize("I was born in 92000, and this is falsé.")
self.assertListEqual(
tokens,
[
SPIECE_UNDERLINE + "I",
SPIECE_UNDERLINE + "was",
SPIECE_UNDERLINE + "b",
"or",
"n",
SPIECE_UNDERLINE + "in",
SPIECE_UNDERLINE + "",
"9",
"2",
"0",
"0",
"0",
",",
SPIECE_UNDERLINE + "and",
SPIECE_UNDERLINE + "this",
SPIECE_UNDERLINE + "is",
SPIECE_UNDERLINE + "f",
"al",
"s",
"é",
".",
],
)
ids = tokenizer.convert_tokens_to_ids(tokens)
self.assertListEqual(ids, [8, 21, 84, 55, 24, 19, 7, 0, 602, 347, 347, 347, 3, 12, 66, 46, 72, 80, 6, 0, 4])
back_tokens = tokenizer.convert_ids_to_tokens(ids)
self.assertListEqual(
back_tokens,
[
SPIECE_UNDERLINE + "I",
SPIECE_UNDERLINE + "was",
SPIECE_UNDERLINE + "b",
"or",
"n",
SPIECE_UNDERLINE + "in",
SPIECE_UNDERLINE + "",
"<unk>",
"2",
"0",
"0",
"0",
",",
SPIECE_UNDERLINE + "and",
SPIECE_UNDERLINE + "this",
SPIECE_UNDERLINE + "is",
SPIECE_UNDERLINE + "f",
"al",
"s",
"<unk>",
".",
],
)
@cached_property
def t5_base_tokenizer(self):
return T5Tokenizer.from_pretrained("t5-base")
def test_eos_treatment(self):
tokenizer = self.t5_base_tokenizer
batch_with_eos_added = tokenizer(["hi</s>", "I went to the gym</s>", "</s>"])
batch_without_eos_added = tokenizer(["hi", "I went to the gym", ""])
self.assertListEqual(batch_with_eos_added["input_ids"], batch_without_eos_added["input_ids"])
def test_prepare_seq2seq_batch(self):
tokenizer = self.t5_base_tokenizer
src_text = ["A long paragraph for summarization.", "Another paragraph for summarization."]
tgt_text = [
"Summary of the text.",
"Another summary.",
]
expected_src_tokens = [71, 307, 8986, 21, 4505, 1635, 1707, 5, tokenizer.eos_token_id]
batch = tokenizer.prepare_seq2seq_batch(
src_text,
tgt_texts=tgt_text,
return_tensors=FRAMEWORK,
)
self.assertIsInstance(batch, BatchEncoding)
result = list(batch.input_ids.numpy()[0])
self.assertListEqual(expected_src_tokens, result)
self.assertEqual((2, 9), batch.input_ids.shape)
self.assertEqual((2, 9), batch.attention_mask.shape)
def test_empty_target_text(self):
tokenizer = self.t5_base_tokenizer
src_text = ["A long paragraph for summarization.", "Another paragraph for summarization."]
batch = tokenizer.prepare_seq2seq_batch(src_text, return_tensors=FRAMEWORK)
# check if input_ids are returned and no decoder_input_ids
self.assertIn("input_ids", batch)
self.assertIn("attention_mask", batch)
self.assertNotIn("decoder_input_ids", batch)
self.assertNotIn("decoder_attention_mask", batch)
def test_max_target_length(self):
tokenizer = self.t5_base_tokenizer
src_text = ["A short paragraph for summarization.", "Another short paragraph for summarization."]
tgt_text = [
"Summary of the text.",
"Another summary.",
]
batch = tokenizer.prepare_seq2seq_batch(
src_text, tgt_texts=tgt_text, max_target_length=32, padding="max_length", return_tensors=FRAMEWORK
)
self.assertEqual(32, batch["labels"].shape[1])
# test None max_target_length
batch = tokenizer.prepare_seq2seq_batch(
src_text, tgt_texts=tgt_text, max_length=32, padding="max_length", return_tensors=FRAMEWORK
)
self.assertEqual(32, batch["labels"].shape[1])
def test_outputs_not_longer_than_maxlen(self):
tokenizer = self.t5_base_tokenizer
batch = tokenizer.prepare_seq2seq_batch(
["I am a small frog" * 1000, "I am a small frog"], return_tensors=FRAMEWORK
)
self.assertIsInstance(batch, BatchEncoding)
self.assertEqual(batch.input_ids.shape, (2, 512))
def test_eos_in_input(self):
tokenizer = self.t5_base_tokenizer
src_text = ["A long paragraph for summarization. </s>"]
tgt_text = ["Summary of the text. </s>"]
expected_src_tokens = [71, 307, 8986, 21, 4505, 1635, 1707, 5, 1]
expected_tgt_tokens = [20698, 13, 8, 1499, 5, 1]
batch = tokenizer.prepare_seq2seq_batch(src_text, tgt_texts=tgt_text, return_tensors=FRAMEWORK)
src_ids = list(batch.input_ids.numpy()[0])
tgt_ids = list(batch.labels.numpy()[0])
self.assertEqual(expected_src_tokens, src_ids)
self.assertEqual(expected_tgt_tokens, tgt_ids)