fix: resolve IndexError when using spk model and the audio contains only 1 ...

Atomie CHEN

2024-03-25 ff83116369ba6afe56430cb0b9d977fbe7f4bced

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one    12
two    1
three    2
four    3
five    4
six    5
seven    6
eigh    7
nine    8
ten    9
eleven    10
twelve    11