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# coding=utf-8
# Copyright 2020 The HuggingFace Team Inc.
#
# 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 clone 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 time
import unittest
from transformers import is_torch_available
from transformers.testing_utils import require_torch, torch_device
from ..test_modeling_common import ids_tensor
if is_torch_available():
import torch
from transformers.generation import (
MaxLengthCriteria,
MaxNewTokensCriteria,
MaxTimeCriteria,
StoppingCriteriaList,
validate_stopping_criteria,
)
@require_torch
class StoppingCriteriaTestCase(unittest.TestCase):
def _get_tensors(self, length):
batch_size = 3
vocab_size = 250
input_ids = ids_tensor((batch_size, length), vocab_size)
scores = torch.ones((batch_size, length), device=torch_device, dtype=torch.float) / length
return input_ids, scores
def test_list_criteria(self):
input_ids, scores = self._get_tensors(5)
criteria = StoppingCriteriaList(
[
MaxLengthCriteria(max_length=10),
MaxTimeCriteria(max_time=0.1),
]
)
self.assertFalse(criteria(input_ids, scores))
input_ids, scores = self._get_tensors(9)
self.assertFalse(criteria(input_ids, scores))
input_ids, scores = self._get_tensors(10)
self.assertTrue(criteria(input_ids, scores))
def test_max_length_criteria(self):
criteria = MaxLengthCriteria(max_length=10)
input_ids, scores = self._get_tensors(5)
self.assertFalse(criteria(input_ids, scores))
input_ids, scores = self._get_tensors(9)
self.assertFalse(criteria(input_ids, scores))
input_ids, scores = self._get_tensors(10)
self.assertTrue(criteria(input_ids, scores))
def test_max_new_tokens_criteria(self):
criteria = MaxNewTokensCriteria(start_length=5, max_new_tokens=5)
input_ids, scores = self._get_tensors(5)
self.assertFalse(criteria(input_ids, scores))
input_ids, scores = self._get_tensors(9)
self.assertFalse(criteria(input_ids, scores))
input_ids, scores = self._get_tensors(10)
self.assertTrue(criteria(input_ids, scores))
criteria_list = StoppingCriteriaList([criteria])
self.assertEqual(criteria_list.max_length, 10)
def test_max_time_criteria(self):
input_ids, scores = self._get_tensors(5)
criteria = MaxTimeCriteria(max_time=0.1)
self.assertFalse(criteria(input_ids, scores))
criteria = MaxTimeCriteria(max_time=0.1, initial_timestamp=time.time() - 0.2)
self.assertTrue(criteria(input_ids, scores))
def test_validate_stopping_criteria(self):
validate_stopping_criteria(StoppingCriteriaList([MaxLengthCriteria(10)]), 10)
with self.assertWarns(UserWarning):
validate_stopping_criteria(StoppingCriteriaList([MaxLengthCriteria(10)]), 11)
stopping_criteria = validate_stopping_criteria(StoppingCriteriaList(), 11)
self.assertEqual(len(stopping_criteria), 1)
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