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Group Sparse Topical Coding <br />
Group Lasso <br />
words <br />
codes <br />
topics <br />
Group Lasso <br />
Code to Topics <br />
⎡⎡<br />
⎢⎢<br />
⎤⎤<br />
w ⎥⎥ E[ w | w ]<br />
|| I<br />
|| I || I K<br />
|| I<br />
nk || I K<br />
nk nk nk kn<br />
n= 1 n= 1 n= 1 k= 1 n=<br />
1<br />
θ<br />
k<br />
= E ⎢⎢ | w ⎥⎥= =<br />
|| I K<br />
nk || I<br />
||<br />
⎢⎢<br />
∑∑<br />
I K<br />
n= 1 k=<br />
1 ⎥⎥<br />
⎢⎢∑∑wnk ⎥⎥ ∑wn ∑∑snkβkn<br />
n= 1 k= 1 n= 1 n= 1 k=<br />
1<br />
⎣⎣<br />
∑ ∑ ∑∑ ∑<br />
⎦⎦<br />
s β<br />
Moran’s Property!<br />
Sums of Poisson!
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