Composer

Not to be confused with the PHP dependency management package.

Composer is a deep learning enabled music generator module built in Python and using TensorFlow. The goal of this project is to investigate how music can be generated and enhanced using machine learning techniques (such as deep learning via neural networks). It is a sandbox for generative MIDI neural-network models. What it is NOT is a fully-featured music generator.

Results

The Transformer model was used to create the ramblings of a transformer.

Installation

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. Composer uses conda, an open-source package management system, for virtual environment management.

Prerequisites:

• A functioning conda installation (We recommend Miniconda, a minimal installer for conda).

Note: The environment.yml file defines all the Python requirements—these are packages that will automatically be installed. This includes tensorflow-gpu which is what we recommend you use (as it will be tremendously faster than running on CPU); however, if you cannot run tensorflow-gpu, remember to change to change this tensorflow. Leave the version number the same.

Automated Install

We provide an automated installation script for Composer located in the scripts directory. If you are running on Mac OS X or Linux, this script is called install_composer.sh. If you are on Windows, it is called install_composer.bat.

From the root project directory (this is important!), open a new terminal window and run the respective script for your platform:

• Windows: scripts/install_composer.bat.
• Mac OS X or Linux: source scripts/install_composer.sh.

After the script is complete, open a terminal window and activate the composer environment by running conda activate composer. You will have to activate this environment every time you open a new terminal window that will be used to run Composer.

Manual Install

To manually install Composer, open a terminal window and navigate to the root project directory.

First clone create a conda environment from the environment.yml file:

conda env create -f environment.yml -q

Next, execute the setup command:

pip install -e .

You can now run the Composer CLI in the conda environment as you would any other command. Also, any changes made to the CLI will be automatically reflected (due to the -e argument when running the setup command).

Command line tools usage

See docstring for basic information about each command or refer to this guide for usage information.

composer

The root command for all functions related to this project.

Usage:

composer [OPTIONS] COMMAND [ARGS]...

Options:

• -v, --verbosity: either CRITICAL, ERROR, WARNING, INFO, or DEBUG; indicates the logger verbosity level.
• --seed: an integer indicating the seed of the random engine.
• --help: show help information.

composer evaluate

Evaluate the specified model.

Usage:

composer evaluate [OPTIONS] MODEL_TYPE DATASET_PATH RESTOREDIR

Options:

• --use-generator / --no-use-generator: indicates whether the dataset should be loaded in chunks during processing (rather than into memory all at once). Defaults to False.
• --max-files: the maximum number of files to load. Defaults to None, which means that ALL files will be loaded.
• --help: show help instructions.

composer export-dataset

Exports a processed dataset input pipeline as a TFRecord file for fast loading times when training.

Note that the PREPROCESSED_PATH argument refers to the path containing the preprocessed '.data' files. For example, this could be "dataset_parent/train", "dataset_parent/test", or simply "path/to/files".

Usage:

composer export-dataset [OPTIONS] MODEL_TYPE PREPROCESSED_PATH OUTPUT_PATH

Options:

• -c, --config: the path to the model configuration file. If unspecified, uses the default config for the model.
• --use-generator / --no-use-generator: indicates whether the dataset should be loaded in chunks during processing (rather than into memory all at once). Defaults to False.
• --max-files: the maximum number of files to load. Defaults to None, which means that ALL files will be loaded.
• --help: show help instructions.

composer generate

Generate a MIDI file.

Usage:

composer generate [OPTIONS] MODEL_TYPE RESTOREDIR OUTPUT_FILEPATH

Options:

• -p, --prompt: The path of the MIDI file to prompt the network with. Defaults to None, meaning a random prompt will be created.
• --prompt-length: number of events to take from the start of the prompt. Defaults to 10.
• -l, --length: The length of the generated event sequence. Defaults to 1024.
• --temperature: a float which dictates how random the result is. Low temperature yields more predictable output. On the other hand, high temperature yields very random ("surprising") outputs. Defaults to 1.0.
• --help: show help instructions.

composer make-config

Creates a configuration file from the default configuration.

Usage:

composer make-config [OPTIONS] FILEPATH

Options:

• --help: show help instructions.

composer preprocess

Preprocesses a raw dataset so that it can be used by specified model type.

Usage:

composer preprocess [OPTIONS] MODEL_TYPE DATASET_PATH OUTPUT_DIRECTORY

Options:

• -w, --num-workers: the number of worker threads to spawn. Defaults to 16.
• -c, --config: The path to the model configuration file. If unspecified, uses the default config for the model.
• -spe, --sustain-period-encode-mode: a member of the composer.dataset.sequence.NoteSequence.SustainPeriodEncodeMode enum. The way in which sustain periods should be encoded. Defaults to EXTEND. Refer to NoteSequence.to_event_sequence documentation for more details on this parameter.
• --transform / --no-transform: indicates whether the dataset should be transformed. If true, a percentage of the dataset is duplicated and pitch shifted and/or time-stretched. Defaults to True. Note that transforming a single sample produces many new samples: one for each pitch in the pitch shift range, and a timestretched one (uniformly sampled from the time stretch range).
• --transform-percent: the ratio of the dataset (from 0 to 1) that should be transformed. Defaults to 100% of the dataset.
• --split / --no-split: indicates whether the dataset should be split into train and test sets. Defaults to True.
• --test-percent: the percentage of the dataset that is allocated to testing. Defaults to 30%.
• --metadata / --no-metadata: indicates whether to output metadata. Defaults to True.
• --help: show help instructions.

composer summary

Prints a summary of the model.

Usage:

composer summary [OPTIONS] MODEL_TYPE

Options:

• -c, --config: the path to the model configuration file. If unspecified, uses the default config for the model.
• --help: show help instructions.

composer synthesize

Synthesize the specified MIDI file using a soundfont.

Usage:

composer synthesize [OPTIONS] MIDI_FILEPATH

Options:

• --sf-path: the filepath of the soundfont to use. If not specified, uses the default soundfont.
• --sf-save-path: the path to save the default soundfont to.
• --chunk-size: the number of bytes to download in a single chunk. Defaults to 32768.
• --help: show help instructions.

composer train

Trains the specified model.

Usage:

composer train [OPTIONS] MODEL_TYPE DATASET_PATH

Options:

• --logdir: the root log directory. Defaults to './output/logdir'.
• --restoredir: the directory of the model to continue training.
• -c, --config: the path to the model configuration file. If unspecified, uses the default config for the model. If a restoredir is specified, the configuration file in the restoredir is used instead (and this value is ignored).
• -e, --epochs: the number of epochs to train for. Defaults to 10.
• --use-generator / --no-use-generator: indicates whether the dataset should be oaded in chunks during processing (rather than into memory all at once). Defaults to False.
• --max-files: the maximum number of files to load. Defaults to None, which means that ALL files will be loaded.
• --save-freq-mode: a member of composer.models.ModelSaveFrequencyMode. The units of the save frequency. Defaults to GLOBAL_STEP.
• --save-freq: the frequency at which to save the model (in the units specified by the save frequency mode). Defaults to every 500 global steps.
• --max-checkpoints: the maximum number of checkpoints to keep. Defaults to 3.
• --show-progress-bar / --no-show-progress-bar: indicates whether a progress bar will be shown to indicate epoch status. Defaults to True.
• --help: show help instructions.

composer visualize-training

Visualize how the model will train. This displays the input and expected output (features and labels) for each step given the dataset.

Usage:

composer visualize-training [OPTIONS] MODEL_TYPE DATASET_PATH

Options:

• -c, --config: the path to the model configuration file. If unspecified, uses the default config for the model.
• --steps: the number of steps to visualize. Defaults to 5.
• --decode-events / -no-decode--events: indicates whether the events should be decoded or displayed as their raw values (i.e. as a one-hot vector or integer id).
• --help: show help instructions.

References

1. Transformer-decoder block implementation based on the open-source OpenAI GPT-2 code.
2. Default "Yamaha-C5-Salamander-JNv5.1" sounddfont from https://sites.google.com/site/soundfonts4u/.