Parameters used for dtr training samples.

Versions v0-v2 sampled parameters for each family from uniform distributions of the indicated mean and half-width, while v3 sampled with equal probability from the indicated discrete values.

版本v0至v2针对各参数族，从给定均值与半宽度的均匀分布中采样参数；而版本v3则从指定离散取值中以等概率方式完成采样。