megengine.random.beta¶
- beta(alpha, beta, size=None)¶
服从贝塔分布 \(\operatorname{Beta}(\alpha, \beta)\) 的随机变量。
对应的概率密度函数为
\[p(x)=\frac{1}{\mathrm{~B}(\alpha, \beta)} x^{\alpha-1}(1-x)^{\beta-1} \quad \text { for } \alpha, \beta>0,\]其中 \(\mathrm{~B}(\alpha, \beta)\) 是 Beta 函数,
\[\mathrm{~B}(\alpha, \beta)=\int_{0}^{1} t^{\alpha-1}(1-t)^{\beta-1} d t 。\]- 参数
- 返回
输出张量
实际案例
import megengine as mge import megengine.random as rand x = rand.beta(alpha=2, beta=1, size=(2, 2)) print(x.numpy()) alpha = mge.Tensor([[0.5], [ 3]], dtype="float32") beta = mge.Tensor([0.5,5], dtype="float32") x = rand.beta(alpha=alpha, beta=beta) print(x.numpy()) x = rand.beta(alpha=alpha, beta=beta, size=2) print(x.numpy())
输出:
[[0.582565 0.91763186] [0.86963767 0.6088103 ]] [[0.41503012 0.16438372] [0.90159506 0.47588003]] [[[0.55195075 0.01111084] [0.95298755 0.25048104]] [[0.11680304 0.13859665] [0.997879 0.43259275]]]