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# coding=utf-8
"""Nsynth Database."""
import os
import json
import textwrap
import datasets
import itertools
import typing as tp
from pathlib import Path
from sklearn.model_selection import train_test_split
SAMPLE_RATE = 16_000
_TRAIN_FILENAME = 'nsynth-train.jsonwav.tar.gz'
_VAL_FILENAME = 'nsynth-valid.jsonwav.tar.gz'
_TEST_FILENAME = 'nsynth-test.jsonwav.tar.gz'
_INSTRUMENT_CLASSES = ['bass', 'brass', 'flute', 'guitar', 'keyboard', 'mallet', 'organ', 'reed', 'string', 'synth_lead', 'vocal']
class NsynthConfig(datasets.BuilderConfig):
"""BuilderConfig for Nsynth."""
def __init__(self, features, **kwargs):
super(NsynthConfig, self).__init__(version=datasets.Version("0.0.1", ""), **kwargs)
self.features = features
class Nsynth(datasets.GeneratorBasedBuilder):
BUILDER_CONFIGS = [
NsynthConfig(
features=datasets.Features(
{
# "file": datasets.Value("string"),
"audio": datasets.Audio(sampling_rate=SAMPLE_RATE),
"instrument": datasets.Value("string"),
"label": datasets.ClassLabel(names=_INSTRUMENT_CLASSES),
}
),
name="instrument",
description='',
),
NsynthConfig(
features=datasets.Features(
{
# "file": datasets.Value("string"),
"audio": datasets.Audio(sampling_rate=SAMPLE_RATE),
"pitch": datasets.Value("string"),
"label": datasets.ClassLabel(names=[str(idx) for idx in range(128)]),
}
),
name="pitch",
description='',
),
]
def _info(self):
return datasets.DatasetInfo(
description="",
features=self.config.features,
supervised_keys=None,
homepage="",
citation="",
task_templates=None,
)
def _split_generators(self, dl_manager):
dl_paths = dl_manager.extract({
'train': _TRAIN_FILENAME,
'validation': _VAL_FILENAME,
'test': _TEST_FILENAME,
})
return[
datasets.SplitGenerator(
name=datasets.Split.TRAIN,
gen_kwargs={"filepath": dl_paths['train']}
),
datasets.SplitGenerator(
name=datasets.Split.VALIDATION,
gen_kwargs={"filepath": dl_paths['validation']}
),
datasets.SplitGenerator(
name=datasets.Split.TEST,
gen_kwargs={"filepath": dl_paths['test']}
),
]
def _generate_examples(self, filepath):
dir_list = os.listdir(filepath)
folder_path = os.path.join(filepath, dir_list[0])
examples_path = os.path.join(folder_path, 'examples.json')
with open(examples_path) as examples_file:
examples = json.load(examples_file)
wav_dict = {}
audio_path = os.path.join(folder_path, "audio")
for filename in os.listdir(audio_path):
audio_filename = os.path.join(audio_path, filename)
guid = filename.replace('.wav', '')
if self.config.name == 'instrument':
yield guid, {
"id": str(guid),
"audio": audio_filename,
"instrument": examples[guid]["instrument_family_str"],
"label": examples[guid]["instrument_family_str"],
}
elif self.config.name == 'pitch':
yield guid, {
"id": str(guid),
"audio": audio_filename,
"pitch": examples[guid]["pitch"],
"label": examples[guid]["pitch"],
} |