Local Dataset Classes

Here are the classes for local datasets.

class muspy.FolderDataset(root, convert=False, kind='json', n_jobs=1, ignore_exceptions=True, use_converted=None)

Class for datasets storing files in a folder.

This class extends muspy.Dataset to support folder datasets. To build a custom folder dataset, please refer to the documentation of muspy.Dataset for details. In addition, set class attribute _extension to the extension to look for when building the dataset and set read to a callable that takes as inputs a filename of a source file and return the converted Music object.

root

Root directory of the dataset.

Type

str or Path

Parameters

• convert (bool, default: False) – Whether to convert the dataset to MusPy JSON/YAML files. If False, will check if converted data exists. If so, disable on-the-fly mode. If not, enable on-the-fly mode and warns.

• kind ({'json', 'yaml'}, default: 'json') – File format to save the data.

• n_jobs (int, default: 1) – Maximum number of concurrently running jobs. If equal to 1, disable multiprocessing.

• ignore_exceptions (bool, default: True) – Whether to ignore errors and skip failed conversions. This can be helpful if some source files are known to be corrupted.

• use_converted (bool, optional) – Force to disable on-the-fly mode and use converted data. Defaults to True if converted data exist, otherwise False.

Important

muspy.FolderDataset.converted_exists() depends solely on a special file named .muspy.success in the folder {root}/_converted/, which serves as an indicator for the existence and integrity of the converted dataset. If the converted dataset is built by muspy.FolderDataset.convert(), the .muspy.success file will be created as well. If the converted dataset is created manually, make sure to create the .muspy.success file in the folder {root}/_converted/ to prevent errors.

Notes

Two modes are available for this dataset. When the on-the-fly mode is enabled, a data sample is converted to a music object on the fly when being indexed. When the on-the-fly mode is disabled, a data sample is loaded from the precomputed converted data.

See also

muspy.Dataset

Base class for MusPy datasets.

property converted_dir

Path to the root directory of the converted dataset.

read(filename)

Read a file into a Music object.

load(filename)

Load a file into a Music object.

exists()

Return True if the dataset exists, otherwise False.

converted_exists()

Return True if the saved dataset exists, otherwise False.

get_converted_filenames()

Return a list of converted filenames.

use_converted()

Disable on-the-fly mode and use converted data.

Returns

Return type

Object itself.

get_raw_filenames()

Return a list of raw filenames.

on_the_fly()

Enable on-the-fly mode and convert the data on the fly.

Returns

Return type

Object itself.

convert(kind='json', n_jobs=1, ignore_exceptions=True, verbose=True, **kwargs)

Convert and save the Music objects.

The converted files will be named by its index and saved to root/_converted. The original filenames can be found in the filenames attribute. For example, the file at filenames[i] will be converted and saved to {i}.json.

Parameters

• kind ({'json', 'yaml'}, default: 'json') – File format to save the data.

• n_jobs (int, default: 1) – Maximum number of concurrently running jobs. If equal to 1, disable multiprocessing.

• ignore_exceptions (bool, default: True) – Whether to ignore errors and skip failed conversions. This can be helpful if some source files are known to be corrupted.

• verbose (bool, default: True) – Whether to be verbose.

• **kwargs – Keyword arguments to pass to muspy.save().

Returns

Return type

Object itself.

classmethod citation()

Print the citation infomation.

classmethod info()

Return the dataset infomation.

save(root, kind='json', n_jobs=1, ignore_exceptions=True, verbose=True, **kwargs)

Save all the music objects to a directory.

Parameters

• root (str or Path) – Root directory to save the data.

• kind ({'json', 'yaml'}, default: 'json') – File format to save the data.

• n_jobs (int, default: 1) – Maximum number of concurrently running jobs. If equal to 1, disable multiprocessing.

• ignore_exceptions (bool, default: True) – Whether to ignore errors and skip failed conversions. This can be helpful if some source files are known to be corrupted.

• verbose (bool, default: True) – Whether to be verbose.

• **kwargs – Keyword arguments to pass to muspy.save().

split(filename=None, splits=None, random_state=None)

Return the dataset as a PyTorch dataset.

Parameters

• filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

to_pytorch_dataset(factory=None, representation=None, split_filename=None, splits=None, random_state=None, **kwargs)

Return the dataset as a PyTorch dataset.

Parameters

• factory (Callable, optional) – Function to be applied to the Music objects. The input is a Music object, and the output is an array or a tensor.

• representation (str, optional) – Target representation. See muspy.to_representation() for available representation.

• split_filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

Returns

Converted PyTorch dataset(s).

Return type

class:torch.utils.data.Dataset` or Dict of :class:torch.utils.data.Dataset`

to_tensorflow_dataset(factory=None, representation=None, split_filename=None, splits=None, random_state=None, **kwargs)

Return the dataset as a TensorFlow dataset.

Parameters

• factory (Callable, optional) – Function to be applied to the Music objects. The input is a Music object, and the output is an array or a tensor.

• representation (str, optional) – Target representation. See muspy.to_representation() for available representation.

• split_filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

Returns

• class:tensorflow.data.Dataset` or Dict of

• class:tensorflow.data.dataset` – Converted TensorFlow dataset(s).

class muspy.MusicDataset(root, kind=None)

Class for datasets of MusPy JSON/YAML files.

Parameters

• root (str or Path) – Root directory of the dataset.

• kind ({'json', 'yaml'}, optional) – File formats to include in the dataset. Defaults to include both JSON and YAML files.

root

Root directory of the dataset.

Type

Path

filenames

Path to the files, relative to root.

Type

list of Path

See also

muspy.Dataset

Base class for MusPy datasets.

classmethod citation()

Print the citation infomation.

classmethod info()

Return the dataset infomation.

save(root, kind='json', n_jobs=1, ignore_exceptions=True, verbose=True, **kwargs)

Save all the music objects to a directory.

Parameters

• root (str or Path) – Root directory to save the data.

• kind ({'json', 'yaml'}, default: 'json') – File format to save the data.

• n_jobs (int, default: 1) – Maximum number of concurrently running jobs. If equal to 1, disable multiprocessing.

• ignore_exceptions (bool, default: True) – Whether to ignore errors and skip failed conversions. This can be helpful if some source files are known to be corrupted.

• verbose (bool, default: True) – Whether to be verbose.

• **kwargs – Keyword arguments to pass to muspy.save().

split(filename=None, splits=None, random_state=None)

Return the dataset as a PyTorch dataset.

Parameters

• filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

to_pytorch_dataset(factory=None, representation=None, split_filename=None, splits=None, random_state=None, **kwargs)

Return the dataset as a PyTorch dataset.

Parameters

• factory (Callable, optional) – Function to be applied to the Music objects. The input is a Music object, and the output is an array or a tensor.

• representation (str, optional) – Target representation. See muspy.to_representation() for available representation.

• split_filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

Returns

Converted PyTorch dataset(s).

Return type

class:torch.utils.data.Dataset` or Dict of :class:torch.utils.data.Dataset`

to_tensorflow_dataset(factory=None, representation=None, split_filename=None, splits=None, random_state=None, **kwargs)

Return the dataset as a TensorFlow dataset.

Parameters

• factory (Callable, optional) – Function to be applied to the Music objects. The input is a Music object, and the output is an array or a tensor.

• representation (str, optional) – Target representation. See muspy.to_representation() for available representation.

• split_filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

Returns

• class:tensorflow.data.Dataset` or Dict of

• class:tensorflow.data.dataset` – Converted TensorFlow dataset(s).

class muspy.ABCFolderDataset(root, convert=False, kind='json', n_jobs=1, ignore_exceptions=True, use_converted=None)

Class for datasets storing ABC files in a folder.

See also

muspy.FolderDataset

Class for datasets storing files in a folder.

read(filename)

Read a file into a Music object.

on_the_fly()

Enable on-the-fly mode and convert the data on the fly.

Returns

Return type

Object itself.

classmethod citation()

Print the citation infomation.

convert(kind='json', n_jobs=1, ignore_exceptions=True, verbose=True, **kwargs)

Convert and save the Music objects.

The converted files will be named by its index and saved to root/_converted. The original filenames can be found in the filenames attribute. For example, the file at filenames[i] will be converted and saved to {i}.json.

Parameters

• kind ({'json', 'yaml'}, default: 'json') – File format to save the data.

• n_jobs (int, default: 1) – Maximum number of concurrently running jobs. If equal to 1, disable multiprocessing.

• ignore_exceptions (bool, default: True) – Whether to ignore errors and skip failed conversions. This can be helpful if some source files are known to be corrupted.

• verbose (bool, default: True) – Whether to be verbose.

• **kwargs – Keyword arguments to pass to muspy.save().

Returns

Return type

Object itself.

property converted_dir

Path to the root directory of the converted dataset.

converted_exists()

Return True if the saved dataset exists, otherwise False.

exists()

Return True if the dataset exists, otherwise False.

get_converted_filenames()

Return a list of converted filenames.

get_raw_filenames()

Return a list of raw filenames.

classmethod info()

Return the dataset infomation.

load(filename)

Load a file into a Music object.

save(root, kind='json', n_jobs=1, ignore_exceptions=True, verbose=True, **kwargs)

Save all the music objects to a directory.

Parameters

• root (str or Path) – Root directory to save the data.

• kind ({'json', 'yaml'}, default: 'json') – File format to save the data.

• n_jobs (int, default: 1) – Maximum number of concurrently running jobs. If equal to 1, disable multiprocessing.

• ignore_exceptions (bool, default: True) – Whether to ignore errors and skip failed conversions. This can be helpful if some source files are known to be corrupted.

• verbose (bool, default: True) – Whether to be verbose.

• **kwargs – Keyword arguments to pass to muspy.save().

split(filename=None, splits=None, random_state=None)

Return the dataset as a PyTorch dataset.

Parameters

• filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

to_pytorch_dataset(factory=None, representation=None, split_filename=None, splits=None, random_state=None, **kwargs)

Return the dataset as a PyTorch dataset.

Parameters

• factory (Callable, optional) – Function to be applied to the Music objects. The input is a Music object, and the output is an array or a tensor.

• representation (str, optional) – Target representation. See muspy.to_representation() for available representation.

• split_filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

Returns

Converted PyTorch dataset(s).

Return type

class:torch.utils.data.Dataset` or Dict of :class:torch.utils.data.Dataset`

to_tensorflow_dataset(factory=None, representation=None, split_filename=None, splits=None, random_state=None, **kwargs)

Return the dataset as a TensorFlow dataset.

Parameters

• factory (Callable, optional) – Function to be applied to the Music objects. The input is a Music object, and the output is an array or a tensor.

• representation (str, optional) – Target representation. See muspy.to_representation() for available representation.

• split_filename (str or Path, optional) – If given and exists, path to the file to read the split from. If None or not exists, path to save the split.

• splits (float or list of float, optional) – Ratios for train-test-validation splits. If None, return the full dataset as a whole. If float, return train and test splits. If list of two floats, return train and test splits. If list of three floats, return train, test and validation splits.

• random_state (int, array_like or RandomState, optional) – Random state used to create the splits. If int or array_like, the value is passed to numpy.random.RandomState, and the created RandomState object is used to create the splits. If RandomState, it will be used to create the splits.

Returns

• class:tensorflow.data.Dataset` or Dict of

• class:tensorflow.data.dataset` – Converted TensorFlow dataset(s).

use_converted()

Disable on-the-fly mode and use converted data.

Returns

Return type

Object itself.