MidiTok

Python package to tokenize MIDI music files, presented at the ISMIR 2021 LBD.

Using Deep Learning with symbolic music ? MidiTok can take care of converting (tokenizing) your MIDI files into tokens, ready to be fed to models such as Transformer, for any generation, transcription or MIR task. MidiTok features most known MIDI tokenizations (e.g. REMI, Compound Word...), and is built around the idea that they all share common parameters and methods. It supports Byte Pair Encoding (BPE) and data augmentation.

Documentation: miditok.readthedocs.com

Install

pip install miditok

MidiTok uses MIDIToolkit, which itself uses Mido to read and write MIDI files, and BPE is backed by Hugging Face 🤗tokenizers for super-fast encoding.

Usage example

The most basic and useful methods are summarized here. And here is a simple notebook example showing how to use Hugging Face models to generate music, with MidiTok taking care of tokenizing MIDIs.

from miditok import REMI, TokenizerConfig
from miditok.utils import get_midi_programs
from miditoolkit import MidiFile
from pathlib import Path

# Creating the tokenizer's configuration, read the doc to explore other parameters
config = TokenizerConfig(nb_velocities=16, use_chords=True)

# Creates the tokenizer and loads a MIDI
tokenizer = REMI(config)
midi = MidiFile('path/to/your_midi.mid')

# Converts MIDI to tokens, and back to a MIDI
tokens = tokenizer(midi)  # calling it will automatically detect MIDIs, paths and tokens before the conversion
converted_back_midi = tokenizer(tokens, get_midi_programs(midi))  # PyTorch / Tensorflow / Numpy tensors supported

# Converts MIDI files to tokens saved as JSON files
midi_paths = list(Path("path", "to", "dataset").glob("**/*.mid"))
data_augmentation_offsets = [2, 1, 1]  # data augmentation on 2 pitch octaves, 1 velocity and 1 duration values
tokenizer.tokenize_midi_dataset(midi_paths, Path("path", "to", "tokens_noBPE"),
                                data_augment_offsets=data_augmentation_offsets)

# Constructs the vocabulary with BPE, from the tokenized files
tokenizer.learn_bpe(
    vocab_size=500,
    tokens_paths=list(Path("path", "to", "tokens_noBPE").glob("**/*.json")),
    start_from_empty_voc=False,
)

# Saving our tokenizer, to retrieve it back later with the load_params method
tokenizer.save_params(Path("path", "to", "save", "tokenizer.json"))

# Converts the tokenized musics into tokens with BPE
tokenizer.apply_bpe_to_dataset(Path('path', 'to', 'tokens_noBPE'), Path('path', 'to', 'tokens_BPE'))

Tokenizations

MidiTok implements the tokenizations: (links to original papers)

• REMI
• REMI+
• MIDI-Like
• TSD
• Structured
• CPWord
• Octuple
• MuMIDI
• MMM

You can find short presentations in the documentation.

Limitations

Tokenizations using Bar tokens (REMI, Compound Word and MuMIDI) only considers a 4/x time signature for now. This means that each bar is considered covering 4 beats. REMI+ and Octuple support it.

Contributions

Contributions are gratefully welcomed, feel free to open an issue or send a PR if you want to add a tokenization or speed up the code. You can read the contribution guide for details.

Todos

• Option to place Program tokens before note tokens for TSD, "vanilla" REMI, MIDI-Like and Structured;
• Extend Time Signature to all tokenizations;
• Control Change messages;
• Option to represent pitch values as pitch intervals, as it seems to improve performances;
• Speeding up MIDI read / load (using a Rust / C++ io library + Python binding ?);
• Data augmentation on duration values at the MIDI level.

Citation

If you use MidiTok for your research, a citation in your manuscript would be gladly appreciated. ❤️

MidiTok paper

@inproceedings{miditok2021,
    title={{MidiTok}: A Python package for {MIDI} file tokenization},
    author={Fradet, Nathan and Briot, Jean-Pierre and Chhel, Fabien and El Fallah Seghrouchni, Amal and Gutowski, Nicolas},
    booktitle={Extended Abstracts for the Late-Breaking Demo Session of the 22nd International Society for Music Information Retrieval Conference},
    year={2021},
    url={https://archives.ismir.net/ismir2021/latebreaking/000005.pdf},
}

The BibTeX citations of all tokenizations can be found in the documentation

Acknowledgments

Special thanks to all the contributors. We acknowledge Aubay, the LIP6, LERIA and ESEO for the initial financing and support.