def batch_tokenizer(tokenizer, txtfile_location, by_line=False, ftfy=True):
# just convert to the token ids, we will do adaptative padding on training time.
with tf.io.gfile.GFile(txtfile_location, "rb") as f:
if by_line:
sources = [l.decode("utf-8") for l in f.readlines()]
else:
sources = [f.read().decode("utf-8")]
if len(sources) <= 0:
# tokenizer crashes when given an empty list, so give it an empty string
# (this happens in --by_line mode for empty files)
sources = ['']
if ftfy:
sources = [ftfy_text(source) for source in sources]
uids = [farmhash.fingerprint64(source) for source in sources]
batches = tokenizer.batch_encode_plus(
sources,
return_token_type_ids=True,
pad_to_max_length=False,
truncation=False,
add_special_tokens=True,
return_offsets_mapping=True,
verbose=False,
)
return zip(
uids,
sources,
batches["input_ids"],
[[start for start, end in offsets]
for offsets in batches["offset_mapping"]],
[[end for start, end in offsets]
for offsets in batches["offset_mapping"]],
)
def variants_to_features(sample_variants):
"""Convert variant calls to TensorFlow features.
See also
https://www.tensorflow.org/versions/r0.10/how_tos/reading_data/index.html
Args:
sample_variants: the sample's variant calls
Returns:
A dictionary of TensorFlow features.
"""
variants_by_feature = collections.defaultdict(list)
for variant in sample_variants:
feature_name = variant_to_feature_name_fn(variant)
words = variant_to_words_fn(variant)
variants_by_feature[feature_name].extend(
# fingerprint64 returns an unsigned int64 but int64 features are
# signed. Convert from from unsigned to signed.
[
struct.unpack('q',
struct.pack('Q',
farmhash.fingerprint64(w)))[0]
for w in words
])
# Fill in features from variants.
features = {}
for feature, variants in variants_by_feature.iteritems():
if variants:
features['variants_' + feature] = tf.train.Feature(
int64_list=tf.train.Int64List(value=variants))
return features
def _hash_to_float(self,
input_string: str,
hash_range: Tuple[float, float],
precision: int = tf.int32.max) -> float:
"""Hashes a string and returns a `float`.
`hash_range` is evenly divided into a number of buckets. The hashed value of
`input_string` is mapped to one of the bucket.
TODO(b/158684105): Update this function to directly map the hash to the
index rather than converting hash -> float -> index.
Args:
input_string: An input string.
hash_range: A tuple representing the range for the hashed value.
precision: The number of buckets in `hash_range`. Must be a positive
integer.
Returns:
A float value being the lower bound of the bucket that the hashed string
value falls into.
"""
(low, high) = hash_range
hashed_value = farmhash.fingerprint64(input_string)
hashed_value = hashed_value % precision
hashed_value = ((float(hashed_value) / precision) * (high - low)) + low
return hashed_value
def _generate_unsigned_hash_code(strings, max_hash_value=sys.maxsize):
# type: (List[str], int) -> int
"""Generates a forever-fixed hash code for `strings`.
The hash code generated is in the range [0, max_hash_value). Note that the
hash code generated by farmhash.fingerprint64 is unsigned.
"""
return farmhash.fingerprint64(json.dumps(strings)) % max_hash_value
def get_data_split(fl_date):
fl_date_str = str(fl_date)
# Use farm fingerprint just like in BigQuery
x = np.abs(
np.uint64(farmhash.fingerprint64(fl_date_str)).astype('int64') % 100)
if x < 60:
data_split = 'TRAIN'
elif x < 80:
data_split = 'VALIDATE'
else:
data_split = 'TEST'
return data_split
def create_fingerprint():
"""Create a unique fingerprint for the running process.
The main function should call this function once to create a unique
fingerprint for that run.
Returns:
Unique fingerprint for this run.
"""
build_run_str = (
build_data.BuildData() + 'time: %d' % (int(round(time.time()))))
return farmhash.fingerprint64(build_run_str)
def Fingerprint(theorem):
"""Compute a unique, stable fingerprint for theorem objects.
Args:
theorem: proof_assistant_pb2.Theorem object
Returns:
62 bit non-negative integer fingerprint. Note that we truncate to 62 bits
for OCaml compatibility. OCaml uses 63 bit signed integers.
"""
if not theorem.HasField('conclusion') and theorem.HasField('fingerprint'):
return theorem.fingerprint
fp = farmhash.fingerprint64(theorem.conclusion)
for hypothesis in theorem.hypotheses:
tmp = farmhash.fingerprint64(hypothesis)
fp = _PairFingerprint(fp, tmp)
result = fp & MASK62
assert (not theorem.HasField('fingerprint')
or theorem.fingerprint == result), (
'Inconsistent fingerprints %d != %d in Theorem protobuf.' %
(result, theorem.fingerprint))
return result
def _compute_skew_for_features(
training_feature: tf.train.Feature, serving_feature: tf.train.Feature,
float_round_ndigits: Optional[int],
feature_name: str) -> feature_skew_results_pb2.FeatureSkew:
"""Computes feature skew for a pair of training and serving features.
Args:
training_feature: The feature to compare from the training example.
serving_feature: The feature to compare from the serving example.
float_round_ndigits: Number of digits precision after the decimal point to
which to round float values before comparison.
feature_name: The name of the feature for which to compute skew between the
examples.
Returns:
A FeatureSkew proto containing information about skew for the specified
feature.
"""
skew_results = feature_skew_results_pb2.FeatureSkew()
skew_results.feature_name = feature_name
if training_feature is not None and serving_feature is not None:
skew_results.training_count = 1
skew_results.serving_count = 1
if (farmhash.fingerprint64(
_get_serialized_feature(
training_feature,
float_round_ndigits)) == farmhash.fingerprint64(
_get_serialized_feature(serving_feature,
float_round_ndigits))):
skew_results.match_count = 1
else:
skew_results.mismatch_count = 1
elif training_feature is not None:
skew_results.training_count = 1
skew_results.training_only = 1
elif serving_feature is not None:
skew_results.serving_count = 1
skew_results.serving_only = 1
return skew_results
def get_data_split_2019(fl_date):
fl_date_str = str(fl_date)
if fl_date_str > '2019':
data_split = 'TEST'
else:
# Use farm fingerprint just like in BigQuery
x = np.abs(
np.uint64(farmhash.fingerprint64(fl_date_str)).astype('int64') %
100)
if x < 95:
data_split = 'TRAIN'
else:
data_split = 'VALIDATE'
return data_split
def hashfile(job):
sources, dst = job
count = 0
with tf.io.gfile.GFile(dst, "w") as wf:
for src in sources:
count += 1
with tf.io.gfile.GFile(src, "rb") as fd:
message_bytes = fd.read()
base64_bytes = base64.b64encode(message_bytes)
# there is no relationship here between these two methods
# the base64 is a trick to allow to dedup gz/compresed files
hashvalue = farmhash.fingerprint64(base64_bytes.decode("ascii"))
wf.write("%s\t%d\n" % (src, hashvalue))
return dst, count
def process(
self, example: tf.train.Example
) -> Iterable[Tuple[str, tf.train.Example]]:
serialized_feature_values = []
for identifier_feature in self._identifier_features:
feature = example.features.feature.get(identifier_feature)
if feature is None:
_EXAMPLES_WITH_MISSING_IDENTIFIER_COUNTER.inc()
return
else:
serialized_feature_values.append(
_get_serialized_feature(feature,
self._float_round_ndigits))
yield (str(farmhash.fingerprint64("".join(serialized_feature_values))),
example)
def get_hash_indices(self, data_strings: List[str]) -> List[List[int]]:
"""Computes the indices at which `data_strings` in IBLT.
Args:
data_strings: A list of strings to be hashed.
Returns:
hash_indices: A vector of `repetitions` hash values of `data_string`,
in {0,...,`table_size`-1}.
"""
all_hash_indices = []
for data_string in data_strings:
hash_indices = []
for i in range(self._repetitions):
hash_indices.append(
farmhash.fingerprint64(str(self._salt[i]) + data_string) %
self._table_size)
all_hash_indices.append(hash_indices)
return all_hash_indices
def batch_tokenizer(tokenizer, txtfile_location, strategy="file"):
# just convert to the token ids, we will do adaptative padding on training time.
sources = lm.parsers.parse_url(txtfile_location, strategy=strategy)
if len(sources) == 0:
return
uids = [farmhash.fingerprint64(source) for source in sources]
batches = tokenizer.batch_encode_plus(
sources,
return_token_type_ids=True,
pad_to_max_length=False,
truncation=False,
add_special_tokens=True,
return_offsets_mapping=True,
verbose=False,
)
yield from zip(
uids,
sources,
batches["input_ids"],
[[start for start, end in offsets] for offsets in batches["offset_mapping"]],
[[end for start, end in offsets] for offsets in batches["offset_mapping"]],
)
def sample_variants_to_example(self, sample, sample_variants,
samples_metadata):
"""Convert variant calls to TensorFlow Example protocol buffers.
See also
https://www.tensorflow.org/versions/r0.10/how_tos/reading_data/index.html
Args:
sample: the identifier for the sample
sample_variants: the sample's variant calls
samples_metadata: dictionary of metadata for all samples
Returns:
A filled in TensorFlow Example proto for this sample.
"""
# Some samples may have no metadata, but we may still want to preprocess
# the data for prediction use cases.
metadata = defaultdict(lambda: self.NA_STRING)
if sample in samples_metadata:
metadata.update(samples_metadata[sample])
variants_by_feature = collections.defaultdict(list)
for variant in sample_variants:
feature_name = self.variant_to_feature_name(variant)
words = self.variant_to_words(variant)
variants_by_feature[feature_name].extend(
# fingerprint64 returns an unsigned int64 but int64 features are
# signed. Convert from from unsigned to signed.
[
struct.unpack('q',
struct.pack('Q',
farmhash.fingerprint64(w)))[0]
for w in words
])
features = {
'sample_name':
util.bytes_feature(str(sample)),
# Nomalize population to integer or NA_INTEGER if no match.
'population':
util.int64_feature(self.POPULATION_MAP[str(
metadata[self.POPULATION_COLUMN])]),
# Use verbatim value of population.
'population_string':
util.bytes_feature(str(metadata[self.POPULATION_COLUMN])),
# Nomalize super population to integer or NA_INTEGER if no match.
'super_population':
util.int64_feature(self.SUPER_POPULATION_MAP[str(
metadata[self.SUPER_POPULATION_COLUMN])]),
# Use verbatim value of super population.
'super_population_string':
util.bytes_feature(str(metadata[self.SUPER_POPULATION_COLUMN])),
# Nomalize sex/gender to integer or NA_INTEGER if no match.
'gender':
util.int64_feature(self.GENDER_MAP[str(
metadata[self.GENDER_COLUMN])]),
# Use verbatim value of sex/gender.
'gender_string':
util.bytes_feature(str(metadata[self.GENDER_COLUMN]))
}
for feature, variants in variants_by_feature.iteritems():
if variants:
features['variants_' + feature] = tf.train.Feature(
int64_list=tf.train.Int64List(value=variants))
return tf.train.Example(features=tf.train.Features(feature=features))
def to_node_id(sexp: Text) -> NodeID: return NodeID(farmhash.fingerprint64(sexp))
