var instances = M.Carousel.init(elems, {
   fullWidth: true,
   onCycleTo: function(data) {
      var lastindex;
      var index;
      lastindex = index;
      index = $(data).data('cindex');
   }
});

var timer;

clearTimeout(timer);
timer = setTimeout(function() {
   console.log("has stopped");
}, 1000);