Add ALBERT Presets

keras_nlp/models/albert/albert_backbone.py

@@ -14,12 +14,16 @@
 
 """ALBERT backbone model."""
 
+import copy
+
 import tensorflow as tf
 from tensorflow import keras
 
 from keras_nlp.layers.position_embedding import PositionEmbedding
 from keras_nlp.layers.transformer_encoder import TransformerEncoder
+from keras_nlp.models.albert.albert_presets import backbone_presets
 from keras_nlp.models.backbone import Backbone
+from keras_nlp.utils.python_utils import classproperty
 
 
 def albert_kernel_initializer(stddev=0.02):
@@ -264,3 +268,7 @@ def get_config(self):
             "name": self.name,
             "trainable": self.trainable,
         }
+
+    @classproperty
+    def presets(cls):
+        return copy.deepcopy(backbone_presets)

keras_nlp/models/albert/albert_preprocessor.py

@@ -13,9 +13,12 @@
 # limitations under the License.
 """ALBERT preprocessor layer."""
 
+import copy
+
 from tensorflow import keras
 
 from keras_nlp.layers.multi_segment_packer import MultiSegmentPacker
+from keras_nlp.models.albert.albert_presets import backbone_presets
 from keras_nlp.models.albert.albert_tokenizer import AlbertTokenizer
 from keras_nlp.models.preprocessor import Preprocessor
 from keras_nlp.utils.keras_utils import (
@@ -179,3 +182,7 @@ def call(self, x, y=None, sample_weight=None):
     @classproperty
     def tokenizer_cls(cls):
         return AlbertTokenizer
+
+    @classproperty
+    def presets(cls):
+        return copy.deepcopy(backbone_presets)

keras_nlp/models/albert/albert_presets.py

@@ -0,0 +1,114 @@
+# Copyright 2022 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.
+"""ALBERT model preset configurations."""
+
+
+backbone_presets = {
+    "albert_base_en_uncased": {
+        "config": {
+            "vocabulary_size": 30000,
+            "num_layers": 12,
+            "num_heads": 12,
+            "num_groups": 1,
+            "num_inner_repetitions": 1,
+            "embedding_dim": 128,
+            "hidden_dim": 768,
+            "intermediate_dim": 3072,
+            "dropout": 0.0,
+            "max_sequence_length": 512,
+            "num_segments": 2,
+        },
+        "preprocessor_config": {},
+        "description": (
+            "Base size of ALBERT where all input is lowercased. "
+            "Trained on English Wikipedia + BooksCorpus."
+        ),
+        "weights_url": "https://storage.googleapis.com/keras-nlp/models/albert_base_en_uncased/v1/model.h5",
+        "weights_hash": "b83ccf3418dd84adc569324183176813",
+        "spm_proto_url": "https://storage.googleapis.com/keras-nlp/models/albert_base_en_uncased/v1/vocab.spm",
+        "spm_proto_hash": "73e62ff8e90f951f24c8b907913039a5",
+    },
+    "albert_large_en_uncased": {
+        "config": {
+            "vocabulary_size": 30000,
+            "num_layers": 24,
+            "num_heads": 16,
+            "num_groups": 1,
+            "num_inner_repetitions": 1,
+            "embedding_dim": 128,
+            "hidden_dim": 1024,
+            "intermediate_dim": 4096,
+            "dropout": 0,
+            "max_sequence_length": 512,
+            "num_segments": 2,
+        },
+        "preprocessor_config": {},
+        "description": (
+            "Large size of ALBERT where all input is lowercased. "
+            "Trained on English Wikipedia + BooksCorpus."
+        ),
+        "weights_url": "https://storage.googleapis.com/keras-nlp/models/albert_large_en_uncased/v1/model.h5",
+        "weights_hash": "c7754804efb245f06dd6e7ced32e082c",
+        "spm_proto_url": "https://storage.googleapis.com/keras-nlp/models/albert_large_en_uncased/v1/vocab.spm",
+        "spm_proto_hash": "73e62ff8e90f951f24c8b907913039a5",
+    },
+    "albert_extra_large_en_uncased": {
+        "config": {
+            "vocabulary_size": 30000,
+            "num_layers": 24,
+            "num_heads": 16,
+            "num_groups": 1,
+            "num_inner_repetitions": 1,
+            "embedding_dim": 128,
+            "hidden_dim": 2048,
+            "intermediate_dim": 8192,
+            "dropout": 0,
+            "max_sequence_length": 512,
+            "num_segments": 2,
+        },
+        "preprocessor_config": {},
+        "description": (
+            "Extra Large size of ALBERT where all input is lowercased. "
+            "Trained on English Wikipedia + BooksCorpus."
+        ),
+        "weights_url": "https://storage.googleapis.com/keras-nlp/models/albert_extra_large_en_uncased/v1/model.h5",
+        "weights_hash": "713209be8aadfa614fd79f18c9aeb16d",
+        "spm_proto_url": "https://storage.googleapis.com/keras-nlp/models/albert_extra_large_en_uncased/v1/vocab.spm",
+        "spm_proto_hash": "73e62ff8e90f951f24c8b907913039a5",
+    },
+    "albert_extra_extra_large_en_uncased": {
+        "config": {
+            "vocabulary_size": 30000,
+            "num_layers": 12,
+            "num_heads": 64,
+            "num_groups": 1,
+            "num_inner_repetitions": 1,
+            "embedding_dim": 128,
+            "hidden_dim": 4096,
+            "intermediate_dim": 16384,
+            "dropout": 0,
+            "max_sequence_length": 512,
+            "num_segments": 2,
+        },
+        "preprocessor_config": {},
+        "description": (
+            "Extra Large size of ALBERT where all input is lowercased. "
+            "Trained on English Wikipedia + BooksCorpus."
+        ),
+        "weights_url": "https://storage.googleapis.com/keras-nlp/models/albert_extra_extra_large_en_uncased/v1/model.h5",
+        "weights_hash": "a835177b692fb6a82139f94c66db2f22",
+        "spm_proto_url": "https://storage.googleapis.com/keras-nlp/models/albert_extra_extra_large_en_uncased/v1/vocab.spm",
+        "spm_proto_hash": "73e62ff8e90f951f24c8b907913039a5",
+    },
+}

keras_nlp/models/albert/albert_presets_test.py

@@ -0,0 +1,127 @@
+# Copyright 2022 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.
+"""Tests for loading pretrained model presets."""
+
+import pytest
+import tensorflow as tf
+from absl.testing import parameterized
+
+from keras_nlp.models.albert.albert_backbone import AlbertBackbone
+from keras_nlp.models.albert.albert_preprocessor import AlbertPreprocessor
+from keras_nlp.models.albert.albert_tokenizer import AlbertTokenizer
+
+
+@pytest.mark.large
+class AlbertPresetSmokeTest(tf.test.TestCase, parameterized.TestCase):
+    """
+    A smoke test for ALBERT presets we run continuously.
+
+    This only tests the smallest weights we have available. Run with:
+    `pytest keras_nlp/models/albert/albert_presets_test.py --run_large`
+    """
+
+    def test_tokenizer_output(self):
+        tokenizer = AlbertTokenizer.from_preset(
+            "albert_base_en_uncased",
+        )
+        outputs = tokenizer("The quick brown fox.")
+        expected_outputs = [13, 1, 438, 2231, 886, 2385, 9]
+        self.assertAllEqual(outputs, expected_outputs)
+
+    def test_preprocessor_output(self):
+        preprocessor = AlbertPreprocessor.from_preset(
+            "albert_base_en_uncased",
+            sequence_length=4,
+        )
+        outputs = preprocessor("The quick brown fox.")["token_ids"]
+        expected_outputs = [2, 13, 1, 3]
+        self.assertAllEqual(outputs, expected_outputs)
+
+    @parameterized.named_parameters(
+        ("preset_weights", True), ("random_weights", False)
+    )
+    def test_backbone_output(self, load_weights):
+        input_data = {
+            "token_ids": tf.constant([[2, 13, 1, 3]]),
+            "segment_ids": tf.constant([[0, 0, 0, 0]]),
+            "padding_mask": tf.constant([[1, 1, 1, 1]]),
+        }
+        model = AlbertBackbone.from_preset(
+            "albert_base_en_uncased", load_weights=load_weights
+        )
+        outputs = model(input_data)
+        if load_weights:
+            outputs = outputs["sequence_output"][0, 0, :5]
+            expected = [1.830863, 1.698645, -1.819195, -0.53382, -0.38114]
+            self.assertAllClose(outputs, expected, atol=0.01, rtol=0.01)
+
+    @parameterized.named_parameters(
+        ("albert_tokenizer", AlbertTokenizer),
+        ("albert_preprocessor", AlbertPreprocessor),
+        ("albert", AlbertBackbone),
+    )
+    def test_preset_docstring(self, cls):
+        """Check we did our docstring formatting correctly."""
+        for name in cls.presets:
+            self.assertRegex(cls.from_preset.__doc__, name)
+
+    @parameterized.named_parameters(
+        ("albert_tokenizer", AlbertTokenizer),
+        ("albert_preprocessor", AlbertPreprocessor),
+        ("albert", AlbertBackbone),
+    )
+    def test_unknown_preset_error(self, cls):
+        # Not a preset name
+        with self.assertRaises(ValueError):
+            cls.from_preset("albert_base_en_uncased_clowntown")
+
+
+@pytest.mark.extra_large
+class AlbertPresetFullTest(tf.test.TestCase, parameterized.TestCase):
+    """
+    Test the full enumeration of our preset.
+
+    This tests every ALBERT preset and is only run manually.
+    Run with:
+    `pytest keras_nlp/models/albert/albert_presets_test.py --run_extra_large`
+    """
+
+    @parameterized.named_parameters(
+        ("preset_weights", True), ("random_weights", False)
+    )
+    def test_load_albert(self, load_weights):
+        for preset in AlbertBackbone.presets:
+            model = AlbertBackbone.from_preset(
+                preset, load_weights=load_weights
+            )
+            input_data = {
+                "token_ids": tf.random.uniform(
+                    shape=(1, 512), dtype=tf.int64, maxval=model.vocabulary_size
+                ),
+                "segment_ids": tf.constant(
+                    [0] * 200 + [1] * 312, shape=(1, 512)
+                ),
+                "padding_mask": tf.constant([1] * 512, shape=(1, 512)),
+            }
+            model(input_data)
+
+    def test_load_tokenizers(self):
+        for preset in AlbertTokenizer.presets:
+            tokenizer = AlbertTokenizer.from_preset(preset)
+            tokenizer("The quick brown fox.")
+
+    def test_load_preprocessors(self):
+        for preset in AlbertPreprocessor.presets:
+            preprocessor = AlbertPreprocessor.from_preset(preset)
+            preprocessor("The quick brown fox.")

keras_nlp/models/albert/albert_tokenizer.py

@@ -14,11 +14,15 @@
 
 """ALBERT tokenizer."""
 
+import copy
+import os
 
 from tensorflow import keras
 
+from keras_nlp.models.albert.albert_presets import backbone_presets
 from keras_nlp.tokenizers.sentence_piece_tokenizer import SentencePieceTokenizer
 from keras_nlp.utils.python_utils import classproperty
+from keras_nlp.utils.python_utils import format_docstring
 
 
 @keras.utils.register_keras_serializable(package="keras_nlp")
@@ -84,12 +88,53 @@ def __init__(self, proto, **kwargs):
 
     @classproperty
     def presets(cls):
-        return {}
+        return copy.deepcopy(backbone_presets)
 
     @classmethod
+    @format_docstring(names=", ".join(backbone_presets))
     def from_preset(
         cls,
         preset,
         **kwargs,
     ):
-        raise NotImplementedError
+        """Instantiate an ALBERT tokenizer from preset vocabulary.
+
+        Args:
+            preset: string. Must be one of {{names}}.
+
+        Examples:
+        ```python
+        # Load a preset tokenizer.
+        tokenizer = keras_nlp.models.AlbertTokenizer.from_preset(
+            "albert_base_en_uncased",
+        )
+
+        # Tokenize some input.
+        tokenizer("The quick brown fox tripped.")
+
+        # Detokenize some input.
+        tokenizer.detokenize([5, 6, 7, 8, 9])
+        ```
+        """
+        if preset not in cls.presets:
+            raise ValueError(
+                "`preset` must be one of "
+                f"""{", ".join(cls.presets)}. Received: {preset}."""
+            )
+        metadata = cls.presets[preset]
+
+        spm_proto = keras.utils.get_file(
+            "vocab.spm",
+            metadata["spm_proto_url"],
+            cache_subdir=os.path.join("models", preset),
+            file_hash=metadata["spm_proto_hash"],
+        )
+
+        config = metadata["preprocessor_config"]
+        config.update(
+            {
+                "proto": spm_proto,
+            },
+        )
+
+        return cls.from_config({**config, **kwargs})