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

Atomie CHEN

2024-03-25 ff83116369ba6afe56430cb0b9d977fbe7f4bced

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9
x    1
xx    2
xxx    3
xl    4
l    5
lx    6
lxx    7
lxxx    8
xc    9