How to use the fitter.storage.s3.S3Storage function in fitter

def __init__(self, aws_access_key_id, aws_secret_access_key, bucket_name, bucket_region, location, **kwargs):
        if not S3Storage.is_valid_region(bucket_region):
            eprint('\'{}\' region is not valid for S3'.format(bucket_region))
            sys.exit(-1)
        self.TYPE = 's3'
        self.AWS_ACCESS_KEY_ID = aws_access_key_id
        self.AWS_SECRET_ACCESS_KEY = aws_secret_access_key
        self.BUCKET_NAME = bucket_name
        self.BUCKET_REGION = bucket_region
        self.LOCATION = location