Errata IWACIII23
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In p.6, the correct definition of \(P^*\) is,
P^* = \hat{Q}
In p.6, the correct definition of \(M^\gamma\) is,
M^\gamma = \cbr{m; \# \cbr{p; p\in P, \exists i\in [n_p],p_i=m} \geq \gamma, m\in M},
Equation (5) is,
Q_p = \cbr{p';t^k(p', p) \geq 0.5, p'\in\hat{P}}, \hat{Q} = \cbr{\mathrm{argmin}_{p'\in Q_p} \br{n_{p'}}; p\in \hat{P}}
The definition of \(a(p_i)\) in Equation (4) is that, \(a(p_i)\) is an artist of \(p_i\).
Sorry for your inconvenience.