To only consider bulk crystal structures, 1,664 materials containing isolated atoms with the minimum distance from all the other atoms of 4 Å or more were excluded. To train Wren (Roost), we canonicalized data by excluding unstable structures with the equivalent stoichiometry (Wyckoff) representations , reducing the number of data to 115,667 (88,224). For the model training, MP dataset was split into training (90 %), validation (5 %) and test (5 %) sets.