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I'm currently reading a paper with the following notation with the del operator which i have never encountered before:

notation

Does $\nabla _m$ just mean $\frac{\delta}{\delta \mathbf m} $ ? Furthermore, I have never seen $\nabla _m \nabla^T _m$ am I to interpret this as a matrix of partial derivatives?

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  • $\begingroup$ What are $m$ and $V$? Does $V$ depend on $m$? And what is the awkward notation $x^{\i}$? $\endgroup$ – Mark Viola May 2 '15 at 3:13
  • $\begingroup$ m and v are the mean and variance of a multivariate gaussian, $m^{\i}$ is the mean of a separate gaussian $\endgroup$ – jshe857 May 2 '15 at 4:49

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