Fig. 4.

The t-SNE plot of the feature representation $\tilde{Z}$. (a) w/o contrastive learning module; (b) ${\lambda }^{\left(Imp\right)}$ is greater than ${\lambda }^{\left(\mathit{\text{pre}}\right)}$; (c) ${\lambda }^{\left(\mathit{\text{pre}}\right)}$ is greater than ${\lambda }^{\left(Imp\right)};$ (d) ${\lambda }^{\left(Imp\right)}$ is equal to ${\lambda }^{\left(\mathit{\text{pre}}\right)}$.