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test_trainer_utils.py
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test_trainer_utils.py
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# coding=utf-8
# Copyright 2018 the 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 unittest
import numpy as np
from transformers.file_utils import is_torch_available
from transformers.testing_utils import require_torch
if is_torch_available():
import torch
from transformers.modeling_outputs import SequenceClassifierOutput
from transformers.trainer_pt_utils import (
DistributedLengthGroupedSampler,
DistributedTensorGatherer,
LabelSmoother,
LengthGroupedSampler,
get_parameter_names,
)
class TstLayer(torch.nn.Module):
def __init__(self, hidden_size):
super().__init__()
self.linear1 = torch.nn.Linear(hidden_size, hidden_size)
self.ln1 = torch.nn.LayerNorm(hidden_size)
self.linear2 = torch.nn.Linear(hidden_size, hidden_size)
self.ln2 = torch.nn.LayerNorm(hidden_size)
self.bias = torch.nn.Parameter(torch.zeros(hidden_size))
def forward(self, x):
h = self.ln1(torch.nn.functional.relu(self.linear1(x)))
h = torch.nn.functional.relu(self.linear2(x))
return self.ln2(x + h + self.bias)
@require_torch
class TrainerUtilsTest(unittest.TestCase):
def test_distributed_tensor_gatherer(self):
# Simulate a result with a dataset of size 21, 4 processes and chunks of lengths 2, 3, 1
world_size = 4
num_samples = 21
input_indices = [
[0, 1, 6, 7, 12, 13, 18, 19],
[2, 3, 4, 8, 9, 10, 14, 15, 16, 20, 0, 1],
[5, 11, 17, 2],
]
predictions = np.random.normal(size=(num_samples, 13))
gatherer = DistributedTensorGatherer(world_size=world_size, num_samples=num_samples)
for indices in input_indices:
gatherer.add_arrays(predictions[indices])
result = gatherer.finalize()
self.assertTrue(np.array_equal(result, predictions))
# With nested tensors
gatherer = DistributedTensorGatherer(world_size=world_size, num_samples=num_samples)
for indices in input_indices:
gatherer.add_arrays([predictions[indices], [predictions[indices], predictions[indices]]])
result = gatherer.finalize()
self.assertTrue(isinstance(result, list))
self.assertTrue(len(result), 2)
self.assertTrue(isinstance(result[1], list))
self.assertTrue(len(result[1]), 2)
self.assertTrue(np.array_equal(result[0], predictions))
self.assertTrue(np.array_equal(result[1][0], predictions))
self.assertTrue(np.array_equal(result[1][1], predictions))
def test_label_smoothing(self):
epsilon = 0.1
num_labels = 12
random_logits = torch.randn(4, 5, num_labels)
random_labels = torch.randint(0, num_labels, (4, 5))
loss = torch.nn.functional.cross_entropy(random_logits.view(-1, num_labels), random_labels.view(-1))
model_output = SequenceClassifierOutput(logits=random_logits)
label_smoothed_loss = LabelSmoother(0.1)(model_output, random_labels)
log_probs = -torch.nn.functional.log_softmax(random_logits, dim=-1)
expected_loss = (1 - epsilon) * loss + epsilon * log_probs.mean()
self.assertTrue(torch.allclose(label_smoothed_loss, expected_loss))
# With a few -100 labels
random_labels[0, 1] = -100
random_labels[2, 1] = -100
random_labels[2, 3] = -100
loss = torch.nn.functional.cross_entropy(random_logits.view(-1, num_labels), random_labels.view(-1))
model_output = SequenceClassifierOutput(logits=random_logits)
label_smoothed_loss = LabelSmoother(0.1)(model_output, random_labels)
log_probs = -torch.nn.functional.log_softmax(random_logits, dim=-1)
# Mask the log probs with the -100 labels
log_probs[0, 1] = 0.0
log_probs[2, 1] = 0.0
log_probs[2, 3] = 0.0
expected_loss = (1 - epsilon) * loss + epsilon * log_probs.sum() / (num_labels * 17)
self.assertTrue(torch.allclose(label_smoothed_loss, expected_loss))
def test_group_by_length(self):
# Get some inputs of random lengths
lengths = torch.randint(0, 25, (100,)).tolist()
# Put one bigger than the others to check it ends up in first position
lengths[32] = 50
indices = list(LengthGroupedSampler(lengths, 4, lengths=lengths))
# The biggest element should be first
self.assertEqual(lengths[indices[0]], 50)
# The indices should be a permutation of range(100)
self.assertEqual(list(sorted(indices)), list(range(100)))
def test_distributed_length_grouped(self):
# Get some inputs of random lengths
lengths = torch.randint(0, 25, (100,)).tolist()
# Put one bigger than the others to check it ends up in first position
lengths[32] = 50
indices_process_0 = list(DistributedLengthGroupedSampler(lengths, 4, 2, 0, lengths=lengths))
indices_process_1 = list(DistributedLengthGroupedSampler(lengths, 4, 2, 1, lengths=lengths))
# The biggest element should be first
self.assertEqual(lengths[indices_process_0[0]], 50)
# The indices should be a permutation of range(100)
self.assertEqual(list(sorted(indices_process_0 + indices_process_1)), list(range(100)))
def test_get_parameter_names(self):
model = torch.nn.Sequential(TstLayer(128), torch.nn.ModuleList([TstLayer(128), TstLayer(128)]))
# fmt: off
self.assertEqual(
get_parameter_names(model, [torch.nn.LayerNorm]),
['0.linear1.weight', '0.linear1.bias', '0.linear2.weight', '0.linear2.bias', '0.bias', '1.0.linear1.weight', '1.0.linear1.bias', '1.0.linear2.weight', '1.0.linear2.bias', '1.0.bias', '1.1.linear1.weight', '1.1.linear1.bias', '1.1.linear2.weight', '1.1.linear2.bias', '1.1.bias']
)
# fmt: on

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