Fig. 2: Class-wise distribution of 33,990 stable materials (DFT calculated thermal stability) used in our study.
From: Supervised pretraining for material property prediction

It shows the proportional breakdown across the main attributes of the materials: conductivity, direct bandgap, metallic, and magnetic. The materials were taken from the Materials Project database20. The following attributes of conductivity are characterized as either true or untrue. Conductivity is divided into three categories: conductor, semiconductor, and insulator.