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authorThibaut Horel <thibaut.horel@gmail.com>2014-11-23 11:19:17 -0500
committerThibaut Horel <thibaut.horel@gmail.com>2014-11-23 11:19:17 -0500
commit0f3c28b41f47326fac78897d770eabf64ceb6c98 (patch)
tree1388f4047199f0e4754b7cd70e05cebd924fc392 /notes/formalisation.tex
parentf96af5373ee10f846cc6a3c5e59ea4e5473fe583 (diff)
downloadcascades-0f3c28b41f47326fac78897d770eabf64ceb6c98.tar.gz
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@@ -56,8 +56,8 @@ Two main goals:
chosen uniformly at random) and on the cascade diffusion process. Such
a model is probably not very realistic, but is necessary to obtain
theoretical guarantees. The unrealism of the model is not a problem
- \emph{per se}; the eventual validity of this approach will be
- experimental anyway.
+ \emph{per se}; the eventual validity of this approach will be confirmed
+ experimentally anyway.
\item It seems likely that we will want the rows of the sensing matrix to
be independent realizations of the same distribution. However,
\textbf{this will never be the case} if we have one row for each time
@@ -67,17 +67,17 @@ Two main goals:
cascade.
\item Something which makes this problem very different from the usual
compressed sensing problems is that the measurements depend on the
- signal we wish to recover: cascades propagates along the edges
- contained in the signal. More precisely, not only the rows of the
- sensing matrix are correlated (if we do not aggregate them by cascade)
- but they are correlated through the signal. Is this a problem? I don't
- know, this looks scary though.
+ signal we wish to recover: cascades propagate along the edges contained
+ in the signal. More precisely, not only the rows of the sensing matrix
+ are correlated (if we do not aggregate them by cascade) but also they
+ are correlated through the signal. Is this a problem? I don't know,
+ this looks scary though.
\item A slightly more general model which we will need in the independent
cascade case considers a signal $s\in[0,1]^{V\times V}$. We can always
go from this model to the binary case by first recovering the
non-binary $s$ and then applying a thresholding procedure. But if we
- only care about recovering the support of $s$, can we do better? (TO
- DO: read stuff about support recovery).
+ only care about recovering the support of $s$, can we do better than
+ this two-step process? (TO DO: read stuff about support recovery).
\end{itemize}
\end{remark}