question: public byte [ ] serialize ( ) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream ( ) ; DataOutputStream oos = new DataOutputStream ( baos ) ; oos . writeBoolean ( sorted ) ; oos . writeInt ( indices . length ) ; for ( int i = 0 ; i < indices . length ; i ++ ) { oos . writeInt ( indices [ i ] ) ; oos . writeFloat ( values [ i ] ) ; } oos . flush ( ) ; return baos . toByteArray ( ) ; }
target:  Serialize the feature vector