Omnizart

Enhancement
- Move `load_label` functions of different datasets into dataset structure classes.
- Add custom exception on fail downloading GD file due to access limit.
- Add unit tests on parsing label files into shared intermediate format.

Bugs
- Fix wrong access name of the dict in vocal midi inference function.
- Fix bug of generating beat module training labels.

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Hotfix release of spleeter error.

Bugs
- Call Spleeter in CLI mode instead of using python class.

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Release the `beat` module for symbolic domain beat transcription.

Features
- Release `beat` module.
- Add an example `patch-cnn` module for demonstrating the implementation progress.

Enhancement
- Refactor the flow of chord module for parsing the feature and label files.
- Modularize F0 information aggragation functions to *utils.py* and *io.py*.
- Improve verbosity on fail to open hdf files.

Documentation
- Re-arrange the side bar with an additional group of CLI.
- Add custom CSS style for adjusting the width of audio and video elements.

Bugs
- Fix Spleeter import errors after upgrading to v2.1.2.

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Vocal melody transcription in both frame- and note-level are live!
We release the modules for vocal melody transcription after a decent amount of effort.
Now you can transcribe your favorite singing voice.

Features
- Release `vocal` and `vocal-contour` submodules.

Enhancement
- Improve chord transcription results by filtering out chord predictions with short duration.
- Resolve the path for transcription output in a consistent way.

Documentation
- Re-organize Quick Start and Tutorial pages to improve accessibility.
- Move the section for development from README.md to CONTRIBUTING.md.

Bug Fix
- Fix bugs of passing the wrong parameter to vamp for chroma feature extraction.

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Features
- Add more supported datasets for download and process.
- Supports to save checkpoints in .pb format with customized model checkpoint callback.

Enhancement
- Huge refactor of constants.dataset. Improves reusability and add more useful common utilities.
- Modularize common parts of app classes.
- Construct base class of loading dataset samples. Reduce duplicate code and reuse the same functionalities.
- Filter out messy Tensorflow warnings when using CLI.

Bug Fix
- Resolved bugs of some function parameters not actually being used inside functions.
- Fix CFP extraction down_fs don't actually work.

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Features
- Add command for synthesizing MIDI file.
- Provides colab for quick start now!

Enhancement
- Lazy import application instance for avoiding pulling large amount of dependencies.
- Group sub-commands into different sections when showing help message.

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