magnatagatune.py

# coding=utf-8

"""Medley-Solos-DB dataset."""


import os
import json
import gzip
import shutil
import pathlib
import logging
import textwrap
import datasets
import itertools
import typing as tp
import pandas as pd
import urllib.request
from pathlib import Path
from copy import deepcopy
from tqdm.auto import tqdm
from rich.logging import RichHandler

logger = logging.getLogger(__name__)
logger.addHandler(RichHandler())
logger.setLevel(logging.INFO)

SAMPLE_RATE = 44_100

# Cache location
VERSION = "0.0.1"
DEFAULT_XDG_CACHE_HOME = "~/.cache"
XDG_CACHE_HOME = os.getenv("XDG_CACHE_HOME", DEFAULT_XDG_CACHE_HOME)
DEFAULT_HF_CACHE_HOME = os.path.join(XDG_CACHE_HOME, "huggingface")
HF_CACHE_HOME = os.path.expanduser(os.getenv("HF_HOME", DEFAULT_HF_CACHE_HOME))
DEFAULT_HF_DATASETS_CACHE = os.path.join(HF_CACHE_HOME, "datasets")
HF_DATASETS_CACHE = Path(os.getenv("HF_DATASETS_CACHE", DEFAULT_HF_DATASETS_CACHE))

CLASSES = [
    'clarinet', 'distorted electric guitar', 'female singer', 'flute', 'piano', 'tenor saxophone', 'trumpet', 'violin'
]
CLASS2INDEX = {cls:idx for idx, cls in enumerate(CLASSES)}
INDEX2CLASS = {idx:cls for idx, cls in enumerate(CLASSES)}


class MedleySolosDBConfig(datasets.BuilderConfig):
    """BuilderConfig for Medley-Solos-DB."""
    
    def __init__(self, features, **kwargs):
        super(MedleySolosDBConfig, self).__init__(version=datasets.Version(VERSION, ""), **kwargs)
        self.features = features


class MedleySolosDB(datasets.GeneratorBasedBuilder):

    BUILDER_CONFIGS = [
        MedleySolosDBConfig(
            features=datasets.Features(
                {
                    "file": datasets.Value("string"),
                    "audio": datasets.Audio(sampling_rate=SAMPLE_RATE),
                    "instrument": datasets.Value("string"), 
                    "label": datasets.features.ClassLabel(names=CLASSES), 
                }
            ),
            name="v1.2", 
            description="",
        ), 
    ]

    DEFAULT_CONFIG_NAME = "v1.2"

    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):
        """Returns SplitGenerators."""
        zip_file_url = "https://zenodo.org/records/3464194/files/Medley-solos-DB.tar.gz"
        _filename = zip_file_url.split('/')[-1]
        _save_path = os.path.join(
            HF_DATASETS_CACHE, 'confit___medley-solos-db/v1.2', VERSION, _filename
        )
        download_file(zip_file_url, _save_path)
        logger.info(f"`{_filename}` is downloaded to {_save_path}")
        archive_path = dl_manager.extract(_save_path)
        logger.info(f"`{_filename}` is now extracted to {archive_path}")

        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN, gen_kwargs={"archive_path": archive_path, "split": "train"}
            ), 
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION, gen_kwargs={"archive_path": archive_path, "split": "validation"}
            ), 
            datasets.SplitGenerator(
                name=datasets.Split.TEST, gen_kwargs={"archive_path": archive_path, "split": "test"}
            ), 
        ]

    def _generate_examples(self, archive_path, split=None):
        metadata_df = pd.read_csv("https://zenodo.org/records/3464194/files/Medley-solos-DB_metadata.csv")
        train_df = metadata_df[metadata_df["subset"] == "training"].reset_index(drop=True)
        validation_df = metadata_df[metadata_df["subset"] == "validation"].reset_index(drop=True)
        test_df = metadata_df[metadata_df["subset"] == "test"].reset_index(drop=True)

        extensions = ['.wav']
        _, _walker = fast_scandir(archive_path, extensions, recursive=True)

        if split == 'train':
            fileid2class = {}
            for idx, row in train_df.iterrows():
                fileid = row['uuid4']
                class_ = row['instrument']
                fileid2class[fileid] = class_
        elif split == 'validation':
            fileid2class = {}
            for idx, row in validation_df.iterrows():
                fileid = row['uuid4']
                class_ = row['instrument']
                fileid2class[fileid] = class_
        elif split == 'test':
            fileid2class = {}
            for idx, row in test_df.iterrows():
                fileid = row['uuid4']
                class_ = row['instrument']
                fileid2class[fileid] = class_
        
        _walker = [fileid for fileid in _walker if not Path(fileid).name.startswith('._Medley')]
        for guid, audio_path in enumerate(_walker):
            fileid = Path(audio_path).stem
            fileid = fileid.split('_')[-1]
            if fileid not in fileid2class:
                continue
            instrument = fileid2class.get(fileid)
            yield guid, {
                "id": str(guid), 
                "file": audio_path, 
                "audio": audio_path, 
                "instrument": instrument, 
                "label": instrument, 
            }


def fast_scandir(path: str, exts: tp.List[str], recursive: bool = False):
    # Scan files recursively faster than glob
    # From github.com/drscotthawley/aeiou/blob/main/aeiou/core.py
    subfolders, files = [], []

    try:  # hope to avoid 'permission denied' by this try
        for f in os.scandir(path):
            try:  # 'hope to avoid too many levels of symbolic links' error
                if f.is_dir():
                    subfolders.append(f.path)
                elif f.is_file():
                    if os.path.splitext(f.name)[1].lower() in exts:
                        files.append(f.path)
            except Exception:
                pass
    except Exception:
        pass

    if recursive:
        for path in list(subfolders):
            sf, f = fast_scandir(path, exts, recursive=recursive)
            subfolders.extend(sf)
            files.extend(f)  # type: ignore

    return subfolders, files


def download_file(
    source,
    dest,
    unpack=False,
    dest_unpack=None,
    replace_existing=False,
    write_permissions=False,
):
    """Downloads the file from the given source and saves it in the given
    destination path.
     Arguments
    ---------
    source : path or url
        Path of the source file. If the source is an URL, it downloads it from
        the web.
    dest : path
        Destination path.
    unpack : bool
        If True, it unpacks the data in the dest folder.
    dest_unpack: path
        Path where to store the unpacked dataset
    replace_existing : bool
        If True, replaces the existing files.
    write_permissions: bool
        When set to True, all the files in the dest_unpack directory will be granted write permissions.
        This option is active only when unpack=True.
    """
    class DownloadProgressBar(tqdm):
        """DownloadProgressBar class."""

        def update_to(self, b=1, bsize=1, tsize=None):
            """Needed to support multigpu training."""
            if tsize is not None:
                self.total = tsize
            self.update(b * bsize - self.n)

    # Create the destination directory if it doesn't exist
    dest_dir = pathlib.Path(dest).resolve().parent
    dest_dir.mkdir(parents=True, exist_ok=True)
    if "http" not in source:
        shutil.copyfile(source, dest)

    elif not os.path.isfile(dest) or (
        os.path.isfile(dest) and replace_existing
    ):
        print(f"Downloading {source} to {dest}")
        with DownloadProgressBar(
            unit="B",
            unit_scale=True,
            miniters=1,
            desc=source.split("/")[-1],
        ) as t:
            urllib.request.urlretrieve(
                source, filename=dest, reporthook=t.update_to
            )
    else:
        print(f"{dest} exists. Skipping download")

    # Unpack if necessary
    if unpack:
        if dest_unpack is None:
            dest_unpack = os.path.dirname(dest)
        print(f"Extracting {dest} to {dest_unpack}")
        # shutil unpack_archive does not work with tar.gz files
        if (
            source.endswith(".tar.gz")
            or source.endswith(".tgz")
            or source.endswith(".gz")
        ):
            out = dest.replace(".gz", "")
            with gzip.open(dest, "rb") as f_in:
                with open(out, "wb") as f_out:
                    shutil.copyfileobj(f_in, f_out)
        else:
            shutil.unpack_archive(dest, dest_unpack)
        if write_permissions:
            set_writing_permissions(dest_unpack)


def set_writing_permissions(folder_path):
    """
    This function sets user writing permissions to all the files in the given folder.
    Arguments
    ---------
    folder_path : folder
        Folder whose files will be granted write permissions.
    """
    for root, dirs, files in os.walk(folder_path):
        for file_name in files:
            file_path = os.path.join(root, file_name)
            # Set writing permissions (mode 0o666) to the file
            os.chmod(file_path, 0o666)