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90 lines
3.6 KiB
90 lines
3.6 KiB
"""Contains the data augmentation pipeline."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import json
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import random
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from data_utils.augmentor.volume_perturb import VolumePerturbAugmentor
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from data_utils.augmentor.speed_perturb import SpeedPerturbAugmentor
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from data_utils.augmentor.resample import ResampleAugmentor
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from data_utils.augmentor.online_bayesian_normalization import OnlineBayesianNormalizationAugmentor
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class AugmentationPipeline(object):
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"""Build a pre-processing pipeline with various augmentation models.Such a
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data augmentation pipeline is oftern leveraged to augment the training
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samples to make the model invariant to certain types of perturbations in the
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real world, improving model's generalization ability.
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The pipeline is built according the the augmentation configuration in json
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string, e.g.
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.. code-block::
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'[{"type": "volume",
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"params": {"min_gain_dBFS": -15,
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"max_gain_dBFS": 15},
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"prob": 0.5},
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{"type": "speed",
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"params": {"min_speed_rate": 0.8,
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"max_speed_rate": 1.2},
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"prob": 0.5}
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]'
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This augmentation configuration inserts two augmentation models
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into the pipeline, with one is VolumePerturbAugmentor and the other
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SpeedPerturbAugmentor. "prob" indicates the probability of the current
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augmentor to take effect.
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:param augmentation_config: Augmentation configuration in json string.
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:type augmentation_config: str
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:param random_seed: Random seed.
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:type random_seed: int
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:raises ValueError: If the augmentation json config is in incorrect format".
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"""
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def __init__(self, augmentation_config, random_seed=0):
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self._rng = random.Random(random_seed)
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self._augmentors, self._rates = self._parse_pipeline_from(
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augmentation_config)
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def transform_audio(self, audio_segment):
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"""Run the pre-processing pipeline for data augmentation.
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Note that this is an in-place transformation.
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:param audio_segment: Audio segment to process.
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:type audio_segment: AudioSegmenet|SpeechSegment
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"""
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for augmentor, rate in zip(self._augmentors, self._rates):
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if self._rng.uniform(0., 1.) <= rate:
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augmentor.transform_audio(audio_segment)
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def _parse_pipeline_from(self, config_json):
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"""Parse the config json to build a augmentation pipelien."""
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try:
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configs = json.loads(config_json)
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augmentors = [
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self._get_augmentor(config["type"], config["params"])
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for config in configs
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]
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rates = [config["prob"] for config in configs]
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except Exception as e:
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raise ValueError("Failed to parse the augmentation config json: "
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"%s" % str(e))
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return augmentors, rates
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def _get_augmentor(self, augmentor_type, params):
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"""Return an augmentation model by the type name, and pass in params."""
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if augmentor_type == "volume":
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return VolumePerturbAugmentor(self._rng, **params)
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if augmentor_type == "speed":
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return SpeedPerturbAugmentor(self._rng, **params)
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if augmentor_type == "resample":
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return ResampleAugmentor(self._rng, **params)
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if augmentor_type == "bayesian_normal":
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return OnlineBayesianNormalizationAugmentor(self._rng, **params)
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else:
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raise ValueError("Unknown augmentor type [%s]." % augmentor_type)
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