FIGARO: Generating Symbolic Music with Fine-Grained Artistic Control

Listen to the samples on Soundcloud.

Paper: https://openreview.net/forum?id=NyR8OZFHw6i

Colab Demo: https://colab.research.google.com/drive/1UAKFkbPQTfkYMq1GxXfGZOJXOXU_svo6

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• FIGARO: Generating Symbolic Music with Fine-Grained Artistic Control
  • Getting started
    • Setup
    • Preparing the Data
    • Download Pre-Trained Models
  • Training
  • Generation
  • Evaluation
  • Parameters
    • Training (train.py)
    • Generation (generate.py)
    • Evaluation (evaluate.py)

Getting started

Prerequisites:

• Python 3.9
• Conda

Setup

1. Clone this repository to your disk
2. Install required packages (see requirements.txt). With venv:

python3 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

Preparing the Data

To train models and to generate new samples, we use the Lakh MIDI dataset (altough any collection of MIDI files can be used).

1. Download (size: 1.6GB) and extract the archive file:

wget http://hog.ee.columbia.edu/craffel/lmd/lmd_full.tar.gz
tar -xzf lmd_full.tar.gz

2. You may wish to remove the archive file now: rm lmd_full.tar.gz

Download Pre-Trained Models

If you don't wish to train your own models, you can download our pre-trained models.

1. Download (size: 2.3GB) and extract the archive file:

wget -O checkpoints.zip https://polybox.ethz.ch/index.php/s/a0HUHzKuPPefWkW/download
unzip checkpoints.zip

2. You may wish to remove the archive file now: rm checkpoints.zip

Training

Training arguments such as model type, batch size, model params are passed to the training scripts via environment variables.

Available model types are:

• vq-vae: VQ-VAE model used for the learned desription
• figaro: FIGARO with both the expert and learned description
• figaro-expert: FIGARO with only the expert description
• figaro-learned: FIGARO with only the learned description
• figaro-no-inst: FIGARO (expert) without instruments
• figaro-no-chord: FIGARO (expert) without chords
• figaro-no-meta: FIGARO (expert) without style (meta) information
• baseline: Unconditional decoder-only baseline following Huang et al. (2018)

Example invocation of the training script is given by the following command:

MODEL=figaro-expert python src/train.py

For models using the learned description (figaro and figaro-learned), a pre-trained VQ-VAE checkpoint needs to be provided as well:

MODEL=figaro VAE_CHECKPOINT=./checkpoints/vq-vae.ckpt python src/train.py

Generation

To generate samples, make sure you have a trained checkpoint prepared (either download one or train it yourself). For this script, make sure that the dataset is prepared according to Preparing the Data. This is needed to extract descriptions, based on which new samples can be generated.

An example invocation of the generation script is given by the following command:

python src/generate.py --model figaro-expert --checkpoint ./checkpoints/figaro-expert.ckpt

For models using the learned description (figaro and figaro-learned), a pre-trained VQ-VAE checkpoint needs to be provided as well:

python src/generate.py --model figaro --checkpoint ./checkpoints/figaro.ckpt --vae_checkpoint ./checkpoints/vq-vae.ckpt

Evaluation

We provide the evaluation scripts used to calculate the desription metrics on some set of generated samples. Refer to the previous section for how to generate samples yourself.

Example usage:

python src/evaluate.py --samples_dir ./samples/figaro-expert

It has been pointed out that the order of the dataset files (from which the splits are calculated) is non-deterministic and depends on the OS. To address this and to ensure reproducibility, I have added the exact files used for training/validation/testing in the respective file in the splits folder.

Parameters

The following environment variables are available for controlling hyperparameters beyond their default value.

Training (train.py)

Model

Variable	Description	Default value
MODEL	Model architecture to be trained
D_MODEL	Hidden size of the model	512
CONTEXT_SIZE	Number of tokens in the context to be passed to the auto-encoder	256
D_LATENT	[VQ-VAE] Dimensionality of the latent space	1024
N_CODES	[VQ-VAE] Codebook size	2048
N_GROUPS	[VQ-VAE] Number of groups to split the latent vector into before discretization	16

Optimization

Variable	Description	Default value
EPOCHS	Max. number of training epochs	16
MAX_TRAINING_STEPS	Max. number of training iterations	100,000
BATCH_SIZE	Number of samples in each batch	128
TARGET_BATCH_SIZE	Number of samples in each backward step, gradients will be accumulated over TARGET_BATCH_SIZE//BATCH_SIZE batches	256
WARMUP_STEPS	Number of learning rate warmup steps	4000
LEARNING_RATE	Initial learning rate, will be decayed after constant warmup of WARMUP_STEPS steps	1e-4

Others

Variable	Description	Default value
CHECKPOINT	Path to checkpoint from which to resume training
VAE_CHECKPOINT	Path to VQ-VAE checkpoint to be used for the learned description
ROOT_DIR	The folder containing MIDI files to train on	./lmd_full
OUTPUT_DIR	Folder for saving checkpoints	./results
LOGGING_DIR	Folder for saving logs	./logs
N_WORKERS	Number of workers to be used for the dataloader	available CPUs

Generation (generate.py)

The generation script uses command line arguments instead of environment variables.

Argument	Description	Default value
--model	Specify which model will be loaded
--checkpoint	Path to the checkpoint for the specified model
--vae_checkpoint	Path to the VQ-VAE checkpoint to be used for the learned description (if applicable)
--lmd_dir	Folder containing MIDI files to extract descriptions from	./lmd_full
--output_dir	Folder to save generated MIDI samples to	./samples
--max_iter	Max. number of tokens that should be generated	16,000
--max_bars	Max. number of bars that should be generated	32
--make_medleys	Set to True if descriptions should be combined into medleys.	False
--n_medley_pieces	Number of pieces to be combined into one	2
--n_medley_bars	Number of bars to take from each piece	16
--verbose	Logging level, set to 0 for silent execution	2

Evaluation (evaluate.py)

The evaluation script uses command line arguments instead of environment variables.

Argument	Description	Default value
--samples_dir	Folder containing generated samples which should be evaluated	./samples
--output_file	CSV file to which a detailed log of all metrics will be saved to	./metrics.csv
--max_samples	Limit the number of samples to be used for computing evaluation metrics	1024