2.1 Data Collection and Pretreatment
An available dataset, Dataset A, is established by collecting experimental T g values of polyesters from the polymer database,PolyInfo 45. The data selection criteria include: number average molar mass (Mn ) > 6000 g mol-1, weight average molar mass (Mw ) > 10000 g mol-1, and T g measured by differential scanning calorimetry (DSC). For polyesters with multipleT g values from different sources, a median is chosen. The final dataset includes 695 polyesters withT g values ranging from -78 to 345 ℃ (Figure S1). The dataset is randomly divided into a training set and a testing set by the ratio of 4:1.