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def __init__(self, base_dir=None, **kwargs):
docstring:
Parses a YAML file to get data folders paths. Stores paths to a number
of folders used throughtout brainrender.
Other classes (e.g. brainrender.Scene) subclass Paths.
:param base_dir: str with path to directory to use to save data. If
none the user's base directiry is used.
:param kwargs: use the name of a folder as key and a path as argument
to specify the path of individual subfolders