def test_rekey(self):
og_dataset = tf.data.Dataset.from_tensors({
'text': 'That is good.',
'other': 'That is bad.'
})
dataset = prep.rekey(og_dataset, {
'inputs': 'other',
'targets': 'text'
})
assert_dataset(dataset, {
'inputs': 'That is bad.',
'targets': 'That is good.'
})
dataset = prep.rekey(og_dataset, {'targets': 'text'})
assert_dataset(dataset, {'targets': 'That is good.'})
dataset = prep.rekey(og_dataset, {'inputs': 'text'})
assert_dataset(dataset, {'inputs': 'That is good.'})
dataset = prep.rekey(og_dataset)
assert_dataset(dataset, {
'text': 'That is good.',
'other': 'That is bad.'
})
dataset = prep.rekey(og_dataset, {'inputs': 'text', 'targets': None})
assert_dataset(dataset, {'inputs': 'That is good.', 'targets': ''})
def c4_bare_preprocess_fn(dataset,
training=True,
spm_path=None,
copy_plaintext=True,
sequence_length=None):
"""Returns a dataset that contains 'inputs' and 'targets' from C4."""
# Set target key to be equal to the text content.
dataset = t5_processors.rekey(dataset,
key_map={
'targets': 'text',
'inputs': None
})
# Vocabulary for tokenization.
vocab = t5_spc_vocab.SentencePieceVocabulary(
sentencepiece_model_file=spm_path or t5_utils.DEFAULT_SPM_PATH)
feature = t5_utils.Feature(vocab)
output_features = {'targets': feature, 'inputs': feature}
# Tokenize the targets.
dataset = t5_utils.encode_string_features(dataset,
output_features,
keys=output_features,
copy_plaintext=copy_plaintext)
# Preprocess the tokens - the exact preprocessors are set via gin.
dataset = t5_processors.unsupervised(dataset,
sequence_length=sequence_length,
output_features=output_features)
# Add EOS.
dataset = add_eos_to_output_features(dataset, training)
return dataset
def c4_bare_preprocess_fn(dataset,
training=True,
spm_path=None,
copy_plaintext=True,
sequence_length=None):
"""Returns a dataset that contains 'inputs' and 'targets' from C4."""
# Set target key to be equal to the text content.
dataset = t5_processors.rekey(dataset,
key_map={
'targets': 'text',
'inputs': None
})
# Vocabulary for tokenization.
vocab = t5_spc_vocab.SentencePieceVocabulary(
sentencepiece_model_file=spm_path or t5_utils.DEFAULT_SPM_PATH)
feature = t5_data.Feature(vocab)
output_features = {'targets': feature, 'inputs': feature}
# Tokenize the targets.
keys = output_features
def encode_string_features_fn(features):
"""Encode all specified feature that are strings and return a dictionary.
Args:
features: a dictionary
Returns:
a dictionary
"""
ret = {}
for k, v in features.items():
if k in keys and v.dtype == tf.string:
if copy_plaintext:
ret['%s_plaintext' % k] = v
v = tf.cast(output_features[k].vocabulary.encode_tf(v),
tf.int64)
ret[k] = v
return ret
dataset = dataset.map(encode_string_features_fn,
num_parallel_calls=tf.data.experimental.AUTOTUNE)
# Preprocess the tokens - the exact preprocessors are set via gin.
dataset = t5_processors.unsupervised(dataset,
sequence_length=sequence_length,
output_features=output_features)
# Add EOS.
dataset = add_eos_to_output_features(dataset, training)
# Truncate and then pad the examples -- all examples have the same shape.
dataset = truncate_dataset_on_len(dataset, training, sequence_length, True)
dataset = pad_dataset_to_length(dataset, training, sequence_length)
return dataset
