However, when the number of objects to track is unknown or varies over time, tracking hypothesis with different Numbers of objects have to be compared.
而当目标数未知或随时间变化时，需要对不同目标数的跟踪进行比较。
However, when the number of objects to track is unknown or varies over time, tracking hypothesis with different Numbers of objects have to be compared.
而当目标数未知或随时间变化时，需要对不同目标数的跟踪进行比较。
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