% 数式
\\usepackage{amsmath,amsfonts,amssymb}
\\usepackage{bm}
︙
\\begin{align}
% v_{\\tau} \\thicksim \\mathcal{N} (u_{\\tau}, \\Sigma_{\\tau} )\\\\
q &= \\prod^T \\mathcal{N} (u_{\\tau}, \\Sigma_{\\tau} )\\\\
q^* &= \\eta^{-1} \\exp(-\\frac{c(V)}{\\lambda})q\\\\
U^* &= \\arg\\min_{U} \\mathbb{D}_{KL}(q^*||q)\\\\
&= \\mathbb{E}_{V~q} [softmax(-\\frac{c(V)}{\\lambda })V] \\nonumber
\\end{align}