code: function (callback) {
              loadArrayBuffer(path.join(dic_path, "cc.dat.gz"), function (err, buffer) {
                  if(err) {
                      return callback(err);
                  }
                  var cc_buffer = new Int16Array(buffer);
                  dic.loadConnectionCosts(cc_buffer);
                  callback(null);
              });
          }
docs: Connection cost matrix