Test mathjax
Using MathJax
\[ \mathbf{X} = \mathbf{Z} \mathbf{P^\mathsf{T}} \]
\[\frac{1}{\left(1+\left(\frac{1}{1+\left(\frac{1}{1+2x}\right)}\right)\right)}\]\begin{equation} E = mc^2 \end{equation}
\[\phi(z) = \frac{1}{1+e^{-z}}\] \[cross-entropy = \sum_i ylog(y')\]