GitLab

This merge request adds the new module gammatone.py which contains the following two classes:

• GammatoneFilterBank
• AuralFeatures

This module introduces three new dependencies,

• Dave/MERIDIAN's aural-features package
• Scipy>=1.6
• Python>=3.7

However, at present I don't think we are interested in enforcing these dependencies for all ketos user, especially not the requirement Python>3.7. So, instead I have implemented the following checks and printing of warning messages:

        if 'aural' not in sys.modules:
            try:
                import aural.meridian as au
            except ImportError:
                print('aural-features package not found.')
                print('aural-features is required by the AuralFeatures class.')
                print('install with `pip install aural-features`.')
                print('note that aural-features requires Scipy>=1.6 and Python>=3.7')
                sys.exit(1)   

and,

    if Version(scipy.__version__) < Version("1.6.0"):
        print('The `compute_filter_coeffs` method in the `gammatone` module requires Scipy>=1.6.0')
        print(f'The present environment only has Scipy=={Version(scipy.__version__)}')
        print('Note that Scipy>=1.6.0 requires Python>=3.7.0')
        exit(1)

Note that this merge request also,

• changes our Python requirement from <3.8 to <=3.8
• updates our CI script to pull a newly created docker image, which has Scipy 1.6 and Python 3.7