/
pipelines_common.py
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/
pipelines_common.py
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# Copyright 2023 The Magenta 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
#
# 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.
"""Common data processing pipelines."""
import numbers
import random
from magenta.pipelines import pipeline
from magenta.pipelines import statistics
import numpy as np
import tensorflow.compat.v1 as tf
class RandomPartition(pipeline.Pipeline):
"""Outputs multiple datasets.
This Pipeline will take a single input feed and randomly partition the inputs
into multiple output datasets. The probabilities of an input landing in each
dataset are given by `partition_probabilities`. Use this Pipeline to partition
previous Pipeline outputs into training and test sets, or training, eval, and
test sets.
"""
def __init__(self, type_, partition_names, partition_probabilities):
super(RandomPartition, self).__init__(
type_, dict((name, type_) for name in partition_names))
if len(partition_probabilities) != len(partition_names) - 1:
raise ValueError('len(partition_probabilities) != '
'len(partition_names) - 1. '
'Last probability is implicity.')
self.partition_names = partition_names
self.cumulative_density = np.cumsum(partition_probabilities).tolist()
self.rand_func = random.random
def transform(self, input_object):
r = self.rand_func()
if r >= self.cumulative_density[-1]:
bucket = len(self.cumulative_density)
else:
for i, cpd in enumerate(self.cumulative_density):
if r < cpd:
bucket = i
break
self._set_stats(self._make_stats(self.partition_names[bucket]))
return dict((name, [] if i != bucket else [input_object])
for i, name in enumerate(self.partition_names))
def _make_stats(self, increment_partition=None):
return [statistics.Counter(increment_partition + '_count', 1)]
def make_sequence_example(inputs, labels):
"""Returns a SequenceExample for the given inputs and labels.
Args:
inputs: A list of input vectors. Each input vector is a list of floats.
labels: A list of ints.
Returns:
A tf.train.SequenceExample containing inputs and labels.
"""
input_features = [
tf.train.Feature(float_list=tf.train.FloatList(value=input_))
for input_ in inputs]
label_features = []
for label in labels:
if isinstance(label, numbers.Number):
label = [label]
label_features.append(
tf.train.Feature(int64_list=tf.train.Int64List(value=label)))
feature_list = {
'inputs': tf.train.FeatureList(feature=input_features),
'labels': tf.train.FeatureList(feature=label_features)
}
feature_lists = tf.train.FeatureLists(feature_list=feature_list)
return tf.train.SequenceExample(feature_lists=feature_lists)