half_cauchy.py 文件源码

def batch_log_pdf(self, x):
        """
        Ref: :py:meth:`pyro.distributions.distribution.Distribution.batch_log_pdf`
        """
        # expand to patch size of input
        mu = self.mu.expand(self.shape(x))
        gamma = self.gamma.expand(self.shape(x))
        x_0 = torch.pow((x - mu) / gamma, 2)
        px = 2 / (np.pi * gamma * (1 + x_0))
        batch_log_pdf_shape = self.batch_shape(x) + (1,)
        return torch.sum(torch.log(px), -1).contiguous().view(batch_log_pdf_shape)