Hydrogenations are a well utilized reaction with a broad range of applications . The mechanistic differences between heterogeneous and homogeneous hydrogenations warrant that these datasets be analyzed separately. Similar to the Buchwald-Hartwig dataset, the heterogeneous hydrogenations sample the reaction space in a "wide but shallow" manner whereas the homogenous hydrogenations follow the Ullmann's "narrow but deep" scope. The overall diversity of the molecules for both hetero and homogeneous hydrogenations are broad (Fig. ). We will not be delving deeply into the heterogeneous reduction of "Other FGs" (those which contain a mixture of nitro, diazo, and nitrile reductions) nor the heterogeneous alkyne reductions due to this reaction type containing only a single unique molecule undergoing hydrogenation (Fig. &).