Algorithm 1.

Expanded similarity of MIL representation

Ensure:  Optimal bag formed by atom combination from instances having a window-size vector ${\hat{\Delta }}_{pq}$

1:  Δpq = ϕ

2:  for q = [τinit, Nτ] do

3:        for p = [q, Nτ] do

4:              $S_{\tau }=[s({\hat{d}}_{\tau }^k,B_{r,\tau }):\forall r,k]$         Calculate similarity matrix

5:              Δpq ← SpΔτ

6:              ${\tilde{l}}_i^{pq}=\mathrm{\text{SVM}}({\Delta }_{pq})$

7:  ${\hat{\Delta }}_{pq}={\mathrm{\text{arg max}}}_{\forall pq}E\left\{l_i-{\tilde{l}}_i^{pq}E\right\}$