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text_layers_test.py
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# Copyright 2024 The TensorFlow Authors. All Rights Reserved.
#
# 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.
"""Tests bert.text_layers."""
import os
import tempfile
import numpy as np
import tensorflow as tf, tf_keras
from tensorflow import estimator as tf_estimator
from sentencepiece import SentencePieceTrainer
from official.nlp.modeling.layers import text_layers
# This test covers the in-process behavior of a BertTokenizer layer.
# For saving, restoring, and the restored behavior (incl. shape inference),
# see nlp/tools/export_tfhub_lib_test.py.
class BertTokenizerTest(tf.test.TestCase):
def _make_vocab_file(self, vocab, filename="vocab.txt"):
path = os.path.join(
tempfile.mkdtemp(dir=self.get_temp_dir()), # New subdir each time.
filename)
with tf.io.gfile.GFile(path, "w") as f:
f.write("\n".join(vocab + [""]))
return path
def test_uncased(self):
vocab_file = self._make_vocab_file(
["[PAD]", "[UNK]", "[CLS]", "[SEP]", "d", "##ef", "abc", "xy"])
bert_tokenize = text_layers.BertTokenizer(
vocab_file=vocab_file, lower_case=True)
inputs = tf.constant(["abc def", "ABC DEF d"])
token_ids = bert_tokenize(inputs)
self.assertAllEqual(token_ids, tf.ragged.constant([[[6], [4, 5]],
[[6], [4, 5], [4]]]))
bert_tokenize.tokenize_with_offsets = True
token_ids_2, start_offsets, limit_offsets = bert_tokenize(inputs)
self.assertAllEqual(token_ids, token_ids_2)
self.assertAllEqual(start_offsets, tf.ragged.constant([[[0], [4, 5]],
[[0], [4, 5], [8]]]))
self.assertAllEqual(limit_offsets, tf.ragged.constant([[[3], [5, 7]],
[[3], [5, 7], [9]]]))
self.assertEqual(bert_tokenize.vocab_size.numpy(), 8)
# Repeat the above and test that case matters with lower_case=False.
def test_cased(self):
vocab_file = self._make_vocab_file(
["[PAD]", "[UNK]", "[CLS]", "[SEP]", "d", "##ef", "abc", "ABC"])
bert_tokenize = text_layers.BertTokenizer(
vocab_file=vocab_file, lower_case=False, tokenize_with_offsets=True)
inputs = tf.constant(["abc def", "ABC DEF"])
token_ids, start_offsets, limit_offsets = bert_tokenize(inputs)
self.assertAllEqual(token_ids, tf.ragged.constant([[[6], [4, 5]],
[[7], [1]]]))
self.assertAllEqual(start_offsets, tf.ragged.constant([[[0], [4, 5]],
[[0], [4]]]))
self.assertAllEqual(limit_offsets, tf.ragged.constant([[[3], [5, 7]],
[[3], [7]]]))
def test_special_tokens_complete(self):
vocab_file = self._make_vocab_file(
["foo", "[PAD]", "[UNK]", "[CLS]", "[SEP]", "[MASK]", "xy"])
bert_tokenize = text_layers.BertTokenizer(
vocab_file=vocab_file, lower_case=True)
self.assertDictEqual(bert_tokenize.get_special_tokens_dict(),
dict(padding_id=1,
start_of_sequence_id=3,
end_of_segment_id=4,
mask_id=5,
vocab_size=7))
def test_special_tokens_partial(self):
vocab_file = self._make_vocab_file(
["[PAD]", "[CLS]", "[SEP]"])
bert_tokenize = text_layers.BertTokenizer(
vocab_file=vocab_file, lower_case=True)
self.assertDictEqual(bert_tokenize.get_special_tokens_dict(),
dict(padding_id=0,
start_of_sequence_id=1,
end_of_segment_id=2,
vocab_size=3)) # No mask_id,
def test_special_tokens_in_estimator(self):
"""Tests getting special tokens without an Eager init context."""
vocab_file = self._make_vocab_file(
["[PAD]", "[UNK]", "[CLS]", "[SEP]", "d", "##ef", "abc", "xy"])
def input_fn():
with tf.init_scope():
self.assertFalse(tf.executing_eagerly())
# Build a preprocessing Model.
sentences = tf_keras.layers.Input(shape=[], dtype=tf.string)
bert_tokenizer = text_layers.BertTokenizer(
vocab_file=vocab_file, lower_case=True)
special_tokens_dict = bert_tokenizer.get_special_tokens_dict()
for k, v in special_tokens_dict.items():
self.assertIsInstance(v, int, "Unexpected type for {}".format(k))
tokens = bert_tokenizer(sentences)
packed_inputs = text_layers.BertPackInputs(
4, special_tokens_dict=special_tokens_dict)(tokens)
preprocessing = tf_keras.Model(sentences, packed_inputs)
# Map the dataset.
ds = tf.data.Dataset.from_tensors(
(tf.constant(["abc", "DEF"]), tf.constant([0, 1])))
ds = ds.map(lambda features, labels: (preprocessing(features), labels))
return ds
def model_fn(features, labels, mode):
del labels # Unused.
return tf_estimator.EstimatorSpec(mode=mode,
predictions=features["input_word_ids"])
estimator = tf_estimator.Estimator(model_fn=model_fn)
outputs = list(estimator.predict(input_fn))
self.assertAllEqual(outputs, np.array([[2, 6, 3, 0],
[2, 4, 5, 3]]))
# This test covers the in-process behavior of a SentencepieceTokenizer layer.
class SentencepieceTokenizerTest(tf.test.TestCase):
def setUp(self):
super().setUp()
# Make a sentencepiece model.
tmp_dir = self.get_temp_dir()
tempfile.mkdtemp(dir=tmp_dir)
vocab = ["a", "b", "c", "d", "e", "abc", "def", "ABC", "DEF"]
model_prefix = os.path.join(tmp_dir, "spm_model")
input_text_file_path = os.path.join(tmp_dir, "train_input.txt")
with tf.io.gfile.GFile(input_text_file_path, "w") as f:
f.write(" ".join(vocab + ["\n"]))
# Add 7 more tokens: <pad>, <unk>, [CLS], [SEP], [MASK], <s>, </s>.
full_vocab_size = len(vocab) + 7
flags = dict(
model_prefix=model_prefix,
model_type="word",
input=input_text_file_path,
pad_id=0, unk_id=1, control_symbols="[CLS],[SEP],[MASK]",
vocab_size=full_vocab_size,
bos_id=full_vocab_size-2, eos_id=full_vocab_size-1)
SentencePieceTrainer.Train(
" ".join(["--{}={}".format(k, v) for k, v in flags.items()]))
self._spm_path = model_prefix + ".model"
def test_uncased(self):
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path, lower_case=True, nbest_size=0)
inputs = tf.constant(["abc def", "ABC DEF d"])
token_ids = sentencepiece_tokenizer(inputs)
self.assertAllEqual(
token_ids,
tf.ragged.constant([[8, 12], [8, 12, 11]]))
sentencepiece_tokenizer.tokenize_with_offsets = True
token_ids_2, start_offsets, limit_offsets = sentencepiece_tokenizer(inputs)
self.assertAllEqual(token_ids, token_ids_2)
self.assertAllEqual(
start_offsets, tf.ragged.constant([[0, 3], [0, 3, 7]]))
self.assertAllEqual(
limit_offsets, tf.ragged.constant([[3, 7], [3, 7, 9]]))
self.assertEqual(sentencepiece_tokenizer.vocab_size.numpy(), 16)
# Repeat the above and test that case matters with lower_case=False.
def test_cased(self):
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path,
lower_case=False,
nbest_size=0,
tokenize_with_offsets=False)
inputs = tf.constant(["abc def", "ABC DEF d"])
token_ids = sentencepiece_tokenizer(inputs)
self.assertAllEqual(
token_ids,
tf.ragged.constant([[8, 12], [5, 6, 11]]))
sentencepiece_tokenizer.tokenize_with_offsets = True
token_ids_2, start_offsets, limit_offsets = sentencepiece_tokenizer(inputs)
self.assertAllEqual(token_ids, token_ids_2)
self.assertAllEqual(
start_offsets,
tf.ragged.constant([[0, 3], [0, 3, 7]]))
self.assertAllEqual(
limit_offsets,
tf.ragged.constant([[3, 7], [3, 7, 9]]))
def test_special_tokens(self):
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path, lower_case=True, nbest_size=0)
self.assertDictEqual(sentencepiece_tokenizer.get_special_tokens_dict(),
dict(padding_id=0,
start_of_sequence_id=2,
end_of_segment_id=3,
mask_id=4,
vocab_size=16))
def test_special_tokens_in_estimator(self):
"""Tests getting special tokens without an Eager init context."""
def input_fn():
with tf.init_scope():
self.assertFalse(tf.executing_eagerly())
# Build a preprocessing Model.
sentences = tf_keras.layers.Input(shape=[], dtype=tf.string)
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path, lower_case=True, nbest_size=0)
special_tokens_dict = sentencepiece_tokenizer.get_special_tokens_dict()
for k, v in special_tokens_dict.items():
self.assertIsInstance(v, int, "Unexpected type for {}".format(k))
tokens = sentencepiece_tokenizer(sentences)
packed_inputs = text_layers.BertPackInputs(
4, special_tokens_dict=special_tokens_dict)(tokens)
preprocessing = tf_keras.Model(sentences, packed_inputs)
# Map the dataset.
ds = tf.data.Dataset.from_tensors(
(tf.constant(["abc", "DEF"]), tf.constant([0, 1])))
ds = ds.map(lambda features, labels: (preprocessing(features), labels))
return ds
def model_fn(features, labels, mode):
del labels # Unused.
return tf_estimator.EstimatorSpec(mode=mode,
predictions=features["input_word_ids"])
estimator = tf_estimator.Estimator(model_fn=model_fn)
outputs = list(estimator.predict(input_fn))
self.assertAllEqual(outputs, np.array([[2, 8, 3, 0],
[2, 12, 3, 0]]))
def test_strip_diacritics(self):
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path,
lower_case=True,
nbest_size=0,
strip_diacritics=True)
inputs = tf.constant(["a b c d e", "ă ḅ č ḓ é"])
token_ids = sentencepiece_tokenizer(inputs)
self.assertAllEqual(
token_ids,
tf.ragged.constant([[7, 9, 10, 11, 13], [7, 9, 10, 11, 13]]))
def test_fail_on_tokenize_with_offsets_and_strip_diacritics(self):
# Raise an error in init().
with self.assertRaises(ValueError):
text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path,
tokenize_with_offsets=True,
lower_case=True,
nbest_size=0,
strip_diacritics=True)
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path,
lower_case=True,
nbest_size=0,
strip_diacritics=True)
sentencepiece_tokenizer.tokenize_with_offsets = True
# Raise an error in call():
inputs = tf.constant(["abc def", "ABC DEF d", "Äffin"])
with self.assertRaises(ValueError):
sentencepiece_tokenizer(inputs)
def test_serialize_deserialize(self):
self.skipTest("b/170480226")
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path,
lower_case=False,
nbest_size=0,
tokenize_with_offsets=False,
name="sentencepiece_tokenizer_layer")
config = sentencepiece_tokenizer.get_config()
new_tokenizer = text_layers.SentencepieceTokenizer.from_config(config)
self.assertEqual(config, new_tokenizer.get_config())
inputs = tf.constant(["abc def", "ABC DEF d"])
token_ids = sentencepiece_tokenizer(inputs)
token_ids_2 = new_tokenizer(inputs)
self.assertAllEqual(token_ids, token_ids_2)
# TODO(b/170480226): Remove once tf_hub_export_lib_test.py covers saving.
def test_saving(self):
sentencepiece_tokenizer = text_layers.SentencepieceTokenizer(
model_file_path=self._spm_path, lower_case=True, nbest_size=0)
inputs = tf_keras.layers.Input([], dtype=tf.string)
outputs = sentencepiece_tokenizer(inputs)
model = tf_keras.Model(inputs, outputs)
export_path = tempfile.mkdtemp(dir=self.get_temp_dir())
model.save(export_path, signatures={})
class BertPackInputsTest(tf.test.TestCase):
def test_round_robin_correct_outputs(self):
bpi = text_layers.BertPackInputs(
10,
start_of_sequence_id=1001,
end_of_segment_id=1002,
padding_id=999,
truncator="round_robin")
# Single input, rank 2.
bert_inputs = bpi(
tf.ragged.constant([[11, 12, 13],
[21, 22, 23, 24, 25, 26, 27, 28, 29, 30]]))
self.assertAllEqual(
bert_inputs["input_word_ids"],
tf.constant([[1001, 11, 12, 13, 1002, 999, 999, 999, 999, 999],
[1001, 21, 22, 23, 24, 25, 26, 27, 28, 1002]]))
self.assertAllEqual(
bert_inputs["input_mask"],
tf.constant([[1, 1, 1, 1, 1, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]))
self.assertAllEqual(
bert_inputs["input_type_ids"],
tf.constant([[0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]))
# Two inputs, rank 3. Truncation does not respect word boundaries.
bert_inputs = bpi([
tf.ragged.constant([[[111], [112, 113]],
[[121, 122, 123], [124, 125, 126], [127, 128]]]),
tf.ragged.constant([[[211, 212], [213]],
[[221, 222], [223, 224, 225], [226, 227, 228]]])
])
self.assertAllEqual(
bert_inputs["input_word_ids"],
tf.constant([[1001, 111, 112, 113, 1002, 211, 212, 213, 1002, 999],
[1001, 121, 122, 123, 124, 1002, 221, 222, 223, 1002]]))
self.assertAllEqual(
bert_inputs["input_mask"],
tf.constant([[1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]))
self.assertAllEqual(
bert_inputs["input_type_ids"],
tf.constant([[0, 0, 0, 0, 0, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 1, 1, 1, 1]]))
# Three inputs. rank 3.
bert_inputs = bpi([
tf.ragged.constant([[[111], [112, 113]],
[[121, 122, 123], [124, 125, 126], [127, 128]]]),
tf.ragged.constant([[[211, 212], [213]],
[[221, 222], [223, 224, 225], [226, 227, 228]]]),
tf.ragged.constant([[[311, 312], [313]],
[[321, 322], [323, 324, 325], [326, 327, 328]]])
])
self.assertAllEqual(
bert_inputs["input_word_ids"],
tf.constant([[1001, 111, 112, 1002, 211, 212, 1002, 311, 312, 1002],
[1001, 121, 122, 1002, 221, 222, 1002, 321, 322, 1002]]))
def test_waterfall_correct_outputs(self):
bpi = text_layers.BertPackInputs(
10,
start_of_sequence_id=1001,
end_of_segment_id=1002,
padding_id=999,
truncator="waterfall")
# Single input, rank 2.
bert_inputs = bpi(
tf.ragged.constant([[11, 12, 13],
[21, 22, 23, 24, 25, 26, 27, 28, 29, 30]]))
self.assertAllEqual(
bert_inputs["input_word_ids"],
tf.constant([[1001, 11, 12, 13, 1002, 999, 999, 999, 999, 999],
[1001, 21, 22, 23, 24, 25, 26, 27, 28, 1002]]))
self.assertAllEqual(
bert_inputs["input_mask"],
tf.constant([[1, 1, 1, 1, 1, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]))
self.assertAllEqual(
bert_inputs["input_type_ids"],
tf.constant([[0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]))
# Two inputs, rank 3. Truncation does not respect word boundaries.
bert_inputs = bpi([
tf.ragged.constant([[[111], [112, 113]],
[[121, 122, 123], [124, 125, 126], [127, 128]]]),
tf.ragged.constant([[[211, 212], [213]],
[[221, 222], [223, 224, 225], [226, 227, 228]]])
])
self.assertAllEqual(
bert_inputs["input_word_ids"],
tf.constant([[1001, 111, 112, 113, 1002, 211, 212, 213, 1002, 999],
[1001, 121, 122, 123, 124, 125, 126, 127, 1002, 1002]]))
self.assertAllEqual(
bert_inputs["input_mask"],
tf.constant([[1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]))
self.assertAllEqual(
bert_inputs["input_type_ids"],
tf.constant([[0, 0, 0, 0, 0, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 1]]))
# Three inputs, rank 3. Truncation does not respect word boundaries.
bert_inputs = bpi([
tf.ragged.constant([[[111], [112, 113]],
[[121, 122, 123], [124, 125, 126], [127, 128]]]),
tf.ragged.constant([[[211], [212]],
[[221, 222], [223, 224, 225], [226, 227, 228]]]),
tf.ragged.constant([[[311, 312], [313]],
[[321, 322], [323, 324, 325], [326, 327]]])
])
self.assertAllEqual(
bert_inputs["input_word_ids"],
tf.constant([[1001, 111, 112, 113, 1002, 211, 212, 1002, 311, 1002],
[1001, 121, 122, 123, 124, 125, 126, 1002, 1002, 1002]]))
self.assertAllEqual(
bert_inputs["input_mask"],
tf.constant([[1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]))
self.assertAllEqual(
bert_inputs["input_type_ids"],
tf.constant([[0, 0, 0, 0, 0, 1, 1, 1, 2, 2],
[0, 0, 0, 0, 0, 0, 0, 0, 1, 2]]))
def test_special_tokens_dict(self):
special_tokens_dict = dict(start_of_sequence_id=1001,
end_of_segment_id=1002,
padding_id=999,
extraneous_key=666)
bpi = text_layers.BertPackInputs(10,
special_tokens_dict=special_tokens_dict)
bert_inputs = bpi(
tf.ragged.constant([[11, 12, 13],
[21, 22, 23, 24, 25, 26, 27, 28, 29, 30]]))
self.assertAllEqual(
bert_inputs["input_word_ids"],
tf.constant([[1001, 11, 12, 13, 1002, 999, 999, 999, 999, 999],
[1001, 21, 22, 23, 24, 25, 26, 27, 28, 1002]]))
# This test covers the in-process behavior of FastWordpieceBertTokenizer layer.
class FastWordPieceBertTokenizerTest(tf.test.TestCase):
def _make_vocab_file(self, vocab, filename="vocab.txt"):
path = os.path.join(
tempfile.mkdtemp(dir=self.get_temp_dir()), # New subdir each time.
filename)
with tf.io.gfile.GFile(path, "w") as f:
f.write("\n".join(vocab + [""]))
return path
def test_uncased(self):
vocab_file = self._make_vocab_file(
["[PAD]", "[UNK]", "[CLS]", "[SEP]", "d", "##ef", "abc", "xy"])
bert_tokenize = text_layers.FastWordpieceBertTokenizer(
vocab_file=vocab_file, lower_case=True)
inputs = tf.constant(["abc def", "ABC DEF d"])
token_ids = bert_tokenize(inputs)
self.assertAllEqual(token_ids, tf.ragged.constant([[[6], [4, 5]],
[[6], [4, 5], [4]]]))
bert_tokenize.tokenize_with_offsets = True
token_ids_2, start_offsets, limit_offsets = bert_tokenize(inputs)
self.assertAllEqual(token_ids, token_ids_2)
self.assertAllEqual(start_offsets, tf.ragged.constant([[[0], [4, 5]],
[[0], [4, 5], [8]]]))
self.assertAllEqual(limit_offsets, tf.ragged.constant([[[3], [5, 7]],
[[3], [5, 7], [9]]]))
self.assertEqual(bert_tokenize.vocab_size, 8)
# Repeat the above and test that case matters with lower_case=False.
def test_cased(self):
vocab_file = self._make_vocab_file(
["[PAD]", "[UNK]", "[CLS]", "[SEP]", "d", "##ef", "abc", "ABC"])
bert_tokenize = text_layers.FastWordpieceBertTokenizer(
vocab_file=vocab_file, lower_case=False, tokenize_with_offsets=True)
inputs = tf.constant(["abc def", "ABC DEF"])
token_ids, start_offsets, limit_offsets = bert_tokenize(inputs)
self.assertAllEqual(token_ids, tf.ragged.constant([[[6], [4, 5]],
[[7], [1]]]))
self.assertAllEqual(start_offsets, tf.ragged.constant([[[0], [4, 5]],
[[0], [4]]]))
self.assertAllEqual(limit_offsets, tf.ragged.constant([[[3], [5, 7]],
[[3], [7]]]))
def test_special_tokens_complete(self):
vocab_file = self._make_vocab_file(
["foo", "[PAD]", "[UNK]", "[CLS]", "[SEP]", "[MASK]", "xy"])
bert_tokenize = text_layers.FastWordpieceBertTokenizer(
vocab_file=vocab_file, lower_case=True)
self.assertDictEqual(bert_tokenize.get_special_tokens_dict(),
dict(padding_id=1,
start_of_sequence_id=3,
end_of_segment_id=4,
mask_id=5,
vocab_size=7))
def test_special_tokens_partial(self):
# [UNK] token is required by fast wordpiece tokenizer.
vocab_file = self._make_vocab_file(
["[PAD]", "[CLS]", "[SEP]", "[UNK]"])
bert_tokenize = text_layers.FastWordpieceBertTokenizer(
vocab_file=vocab_file, lower_case=True)
self.assertDictEqual(bert_tokenize.get_special_tokens_dict(),
dict(padding_id=0,
start_of_sequence_id=1,
end_of_segment_id=2,
vocab_size=4)) # No mask_id,
def test_special_tokens_in_estimator(self):
"""Tests getting special tokens without an Eager init context."""
vocab_file = self._make_vocab_file(
["[PAD]", "[UNK]", "[CLS]", "[SEP]", "d", "##ef", "abc", "xy"])
def input_fn():
with tf.init_scope():
self.assertFalse(tf.executing_eagerly())
# Build a preprocessing Model.
sentences = tf_keras.layers.Input(shape=[], dtype=tf.string)
bert_tokenizer = text_layers.FastWordpieceBertTokenizer(
vocab_file=vocab_file, lower_case=True)
special_tokens_dict = bert_tokenizer.get_special_tokens_dict()
for k, v in special_tokens_dict.items():
self.assertIsInstance(v, int, "Unexpected type for {}".format(k))
tokens = bert_tokenizer(sentences)
packed_inputs = text_layers.BertPackInputs(
4, special_tokens_dict=special_tokens_dict)(tokens)
preprocessing = tf_keras.Model(sentences, packed_inputs)
# Map the dataset.
ds = tf.data.Dataset.from_tensors(
(tf.constant(["abc", "DEF"]), tf.constant([0, 1])))
ds = ds.map(lambda features, labels: (preprocessing(features), labels))
return ds
def model_fn(features, labels, mode):
del labels # Unused.
return tf_estimator.EstimatorSpec(mode=mode,
predictions=features["input_word_ids"])
estimator = tf_estimator.Estimator(model_fn=model_fn)
outputs = list(estimator.predict(input_fn))
self.assertAllEqual(outputs, np.array([[2, 6, 3, 0],
[2, 4, 5, 3]]))
if __name__ == "__main__":
tf.test.main()