update infer func for old contextual

shixian.shi

2023-07-06 5690a8bcb314ee53a5db1c704f6e3fe61460c7f6

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from fun_text_processing.inverse_text_normalization.tl.graph_utils import GraphFst
 
 
class FractionFst(GraphFst):
    """
    Finite state transducer for verbalizing fraction, 
    """
 
    def __init__(self):
        super().__init__(name="fraction", kind="verbalize")