def read_annotation(self):
    afile = os.path.join(self.results_dir, 'obs.txt')
    if (not os.path.exists(afile)):
        return None
    with open(afile, 'r') as f:
        return f.read()
def read_annotation(self):
    afile = os.path.join(self.results_dir, 'obs.txt')
    if (not os.path.exists(afile)):
        return None
    with open(afile, 'r') as f:
        return f.read()