question: @ Override public boolean beforeSampling ( Sampler < ? , ? , ? > sampler , SampledVertexDecorator < ? > vertex ) { if ( sampler . getIteration ( ) > lastIteration ) { File file = makeDirectories ( String . format ( "%1$s/it.%2$s" , getRootDirectory ( ) , lastIteration ) ) ; analyze ( sampler . getSampledGraph ( ) , file . getAbsolutePath ( ) ) ; lastIteration = sampler . getIteration ( ) ; } return true ; }
target:  Analysis the sampled graph after a snowball iteration has been completed.