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jBillou edited Waveform optimization.tex
over 9 years ago
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We want to maximize the expected value of the log of the joint distribution of hidden states and data, $P(D,X|\Theta)$ with respect to the unknown states, conditioned on the data and the current parameters:
$\argmax_{\Theta_k} \begin{equation}
\argmax_{\Theta_k} \int_X log( P(D,X|\Theta_k) ) P(X|D,\Theta_{k-1})
$ \label{eq:Qem}
\end{equation}
In the context of our HMM the joint distribution $P(D,X|\Theta)$ is given by $\prod_i^N P(d_t^i,x_i^t|\Theta) = \prod_i^N P(d_t^i|x_i^t,\Theta)P(x_i^t|\Theta)$.