Val Data Number is 0

[day0loophole]

when I run cmd cache ，it works well in cache.train.tmp, but cache.val.tmp is blank,no content.
Continue to run cmd train, There is a log when read cache.val.tmp "Read Cache File End! Caches Num is 0."
Finally result in this error： ValueError: num_samples should be a positive integer value, but got num_samples=0

[CHANGEORT]

Because your validate val sample number is 0, you should increase the config.yaml system val' rate to satisfy 1 num at least.

[amd5]

Insufficient sample quantity