[fix] better solution for handling empty result (#1796)

Xingchen Song(宋星辰)

2024-06-11 0bd1a4d6a9893e45438505514a063d9deee91f21

 fun_text_processing/text_normalization/en/verbalizers/verbalize.py

@@ -1,5 +1,3 @@


from fun_text_processing.text_normalization.en.graph_utils import GraphFst
from fun_text_processing.text_normalization.en.verbalizers.abbreviation import AbbreviationFst
from fun_text_processing.text_normalization.en.verbalizers.cardinal import CardinalFst
@@ -19,7 +17,7 @@
class VerbalizeFst(GraphFst):
    """
    Composes other verbalizer grammars.
    For deployment, this grammar will be compiled and exported to OpenFst Finate State Archiv (FAR) File. 
    For deployment, this grammar will be compiled and exported to OpenFst Finate State Archiv (FAR) File.
    More details to deployment at NeMo/tools/text_processing_deployment.

    Args:
@@ -39,7 +37,9 @@
        fraction_graph = fraction.fst
        telephone_graph = TelephoneFst(deterministic=deterministic).fst
        electronic_graph = ElectronicFst(deterministic=deterministic).fst
        measure = MeasureFst(decimal=decimal, cardinal=cardinal, fraction=fraction, deterministic=deterministic)
        measure = MeasureFst(
            decimal=decimal, cardinal=cardinal, fraction=fraction, deterministic=deterministic
        )
        measure_graph = measure.fst
        time_graph = TimeFst(deterministic=deterministic).fst
        date_graph = DateFst(ordinal=ordinal, deterministic=deterministic).fst