def preprocess_text(self, text):
    text = text.replace('/', '-')
    text = text.replace('{', '-')
    text = text.replace('}', '-')
    text = text.replace('[', '-')
    text = text.replace(']', '-')
    return text
def preprocess_text(self, text):
    text = text.replace('/', '-')
    text = text.replace('{', '-')
    text = text.replace('}', '-')
    text = text.replace('[', '-')
    text = text.replace(']', '-')
    return text