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Add presets for Electra and checkpoint conversion script (#1384)
* Added ElectraBackbone * Added backbone tests for ELECTRA * Fix config * Add model import to __init__ * add electra tokenizer * add tests for tokenizer * add __init__ file * add tokenizer and backbone to models __init__ * Fix Failing tokenization test * Add example on usage of the tokenizer with custom vocabulary * Add conversion script to convert weights from checkpoint * Add electra preprocessor * Add presets and tests * Add presets config with model weights * Add checkpoint conversion script * Name conversion for electra models * Update naming conventions according to preset names * Fix failing tokenizer tests * Update checkpoint conversion script according to kaggle * Add validate function * Kaggle preset * update preset link * Add electra presets * Complete run_small_preset test for electra * Add large variations of electra in presets * Fix case issues with electra presets * Fix format --------- Co-authored-by: Matt Watson <mattdangerw@gmail.com>
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# Copyright 2023 The KerasNLP Authors | ||
# | ||
# 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 | ||
# | ||
# https://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. | ||
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import copy | ||
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from keras_nlp.api_export import keras_nlp_export | ||
from keras_nlp.layers.preprocessing.multi_segment_packer import ( | ||
MultiSegmentPacker, | ||
) | ||
from keras_nlp.models.electra.electra_presets import backbone_presets | ||
from keras_nlp.models.electra.electra_tokenizer import ElectraTokenizer | ||
from keras_nlp.models.preprocessor import Preprocessor | ||
from keras_nlp.utils.keras_utils import ( | ||
convert_inputs_to_list_of_tensor_segments, | ||
) | ||
from keras_nlp.utils.keras_utils import pack_x_y_sample_weight | ||
from keras_nlp.utils.python_utils import classproperty | ||
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@keras_nlp_export("keras_nlp.models.ElectraPreprocessor") | ||
class ElectraPreprocessor(Preprocessor): | ||
"""A ELECTRA preprocessing layer which tokenizes and packs inputs. | ||
This preprocessing layer will do three things: | ||
1. Tokenize any number of input segments using the `tokenizer`. | ||
2. Pack the inputs together using a `keras_nlp.layers.MultiSegmentPacker`. | ||
with the appropriate `"[CLS]"`, `"[SEP]"` and `"[PAD]"` tokens. | ||
3. Construct a dictionary of with keys `"token_ids"` and `"padding_mask"`, | ||
that can be passed directly to a ELECTRA model. | ||
This layer can be used directly with `tf.data.Dataset.map` to preprocess | ||
string data in the `(x, y, sample_weight)` format used by | ||
`keras.Model.fit`. | ||
Args: | ||
tokenizer: A `keras_nlp.models.ElectraTokenizer` instance. | ||
sequence_length: The length of the packed inputs. | ||
truncate: string. The algorithm to truncate a list of batched segments | ||
to fit within `sequence_length`. The value can be either | ||
`round_robin` or `waterfall`: | ||
- `"round_robin"`: Available space is assigned one token at a | ||
time in a round-robin fashion to the inputs that still need | ||
some, until the limit is reached. | ||
- `"waterfall"`: The allocation of the budget is done using a | ||
"waterfall" algorithm that allocates quota in a | ||
left-to-right manner and fills up the buckets until we run | ||
out of budget. It supports an arbitrary number of segments. | ||
Call arguments: | ||
x: A tensor of single string sequences, or a tuple of multiple | ||
tensor sequences to be packed together. Inputs may be batched or | ||
unbatched. For single sequences, raw python inputs will be converted | ||
to tensors. For multiple sequences, pass tensors directly. | ||
y: Any label data. Will be passed through unaltered. | ||
sample_weight: Any label weight data. Will be passed through unaltered. | ||
Examples: | ||
Directly calling the layer on data. | ||
```python | ||
preprocessor = keras_nlp.models.ElectraPreprocessor.from_preset( | ||
"electra_base_discriminator_en" | ||
) | ||
preprocessor(["The quick brown fox jumped.", "Call me Ishmael."]) | ||
# Custom vocabulary. | ||
vocab = ["[UNK]", "[CLS]", "[SEP]", "[PAD]", "[MASK]"] | ||
vocab += ["The", "quick", "brown", "fox", "jumped", "."] | ||
tokenizer = keras_nlp.models.ElectraTokenizer(vocabulary=vocab) | ||
preprocessor = keras_nlp.models.ElectraPreprocessor(tokenizer) | ||
preprocessor("The quick brown fox jumped.") | ||
``` | ||
Mapping with `tf.data.Dataset`. | ||
```python | ||
preprocessor = keras_nlp.models.ElectraPreprocessor.from_preset( | ||
"electra_base_discriminator_en" | ||
) | ||
first = tf.constant(["The quick brown fox jumped.", "Call me Ishmael."]) | ||
second = tf.constant(["The fox tripped.", "Oh look, a whale."]) | ||
label = tf.constant([1, 1]) | ||
# Map labeled single sentences. | ||
ds = tf.data.Dataset.from_tensor_slices((first, label)) | ||
ds = ds.map(preprocessor, num_parallel_calls=tf.data.AUTOTUNE) | ||
# Map unlabeled single sentences. | ||
ds = tf.data.Dataset.from_tensor_slices(first) | ||
ds = ds.map(preprocessor, num_parallel_calls=tf.data.AUTOTUNE) | ||
# Map labeled sentence pairs. | ||
ds = tf.data.Dataset.from_tensor_slices(((first, second), label)) | ||
ds = ds.map(preprocessor, num_parallel_calls=tf.data.AUTOTUNE) | ||
# Map unlabeled sentence pairs. | ||
ds = tf.data.Dataset.from_tensor_slices((first, second)) | ||
# Watch out for tf.data's default unpacking of tuples here! | ||
# Best to invoke the `preprocessor` directly in this case. | ||
ds = ds.map( | ||
lambda first, second: preprocessor(x=(first, second)), | ||
num_parallel_calls=tf.data.AUTOTUNE, | ||
) | ||
``` | ||
""" | ||
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def __init__( | ||
self, | ||
tokenizer, | ||
sequence_length=512, | ||
truncate="round_robin", | ||
**kwargs, | ||
): | ||
super().__init__(**kwargs) | ||
self.tokenizer = tokenizer | ||
self.packer = MultiSegmentPacker( | ||
start_value=self.tokenizer.cls_token_id, | ||
end_value=self.tokenizer.sep_token_id, | ||
pad_value=self.tokenizer.pad_token_id, | ||
truncate=truncate, | ||
sequence_length=sequence_length, | ||
) | ||
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def get_config(self): | ||
config = super().get_config() | ||
config.update( | ||
{ | ||
"sequence_length": self.packer.sequence_length, | ||
"truncate": self.packer.truncate, | ||
} | ||
) | ||
return config | ||
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def call(self, x, y=None, sample_weight=None): | ||
x = convert_inputs_to_list_of_tensor_segments(x) | ||
x = [self.tokenizer(segment) for segment in x] | ||
token_ids, segment_ids = self.packer(x) | ||
x = { | ||
"token_ids": token_ids, | ||
"segment_ids": segment_ids, | ||
"padding_mask": token_ids != self.tokenizer.pad_token_id, | ||
} | ||
return pack_x_y_sample_weight(x, y, sample_weight) | ||
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@classproperty | ||
def tokenizer_cls(cls): | ||
return ElectraTokenizer | ||
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@classproperty | ||
def presets(cls): | ||
return copy.deepcopy({**backbone_presets}) |
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# Copyright 2023 The KerasNLP Authors | ||
# | ||
# 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 | ||
# | ||
# https://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. | ||
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import pytest | ||
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from keras_nlp.models.electra.electra_preprocessor import ElectraPreprocessor | ||
from keras_nlp.models.electra.electra_tokenizer import ElectraTokenizer | ||
from keras_nlp.tests.test_case import TestCase | ||
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class ElectraPreprocessorTest(TestCase): | ||
def setUp(self): | ||
self.vocab = ["[PAD]", "[UNK]", "[CLS]", "[SEP]", "[MASK]"] | ||
self.vocab += ["THE", "QUICK", "BROWN", "FOX"] | ||
self.vocab += ["the", "quick", "brown", "fox"] | ||
self.tokenizer = ElectraTokenizer(vocabulary=self.vocab) | ||
self.init_kwargs = { | ||
"tokenizer": self.tokenizer, | ||
"sequence_length": 8, | ||
} | ||
self.input_data = ( | ||
["THE QUICK BROWN FOX."], | ||
[1], # Pass through labels. | ||
[1.0], # Pass through sample_weights. | ||
) | ||
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def test_preprocessor_basics(self): | ||
self.run_preprocessing_layer_test( | ||
cls=ElectraPreprocessor, | ||
init_kwargs=self.init_kwargs, | ||
input_data=self.input_data, | ||
expected_output=( | ||
{ | ||
"token_ids": [[2, 5, 6, 7, 8, 1, 3, 0]], | ||
"segment_ids": [[0, 0, 0, 0, 0, 0, 0, 0]], | ||
"padding_mask": [[1, 1, 1, 1, 1, 1, 1, 0]], | ||
}, | ||
[1], # Pass through labels. | ||
[1.0], # Pass through sample_weights. | ||
), | ||
) | ||
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def test_errors_for_2d_list_input(self): | ||
preprocessor = ElectraPreprocessor(**self.init_kwargs) | ||
ambiguous_input = [["one", "two"], ["three", "four"]] | ||
with self.assertRaises(ValueError): | ||
preprocessor(ambiguous_input) | ||
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@pytest.mark.extra_large | ||
def test_all_presets(self): | ||
for preset in ElectraPreprocessor.presets: | ||
self.run_preset_test( | ||
cls=ElectraPreprocessor, | ||
preset=preset, | ||
input_data=self.input_data, | ||
) |
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