You can include the .css and .js files like instructed on the Material Design Lite website, then just do the following when bootstrapping your app or when a controller loads.
angular.element(document).ready(
function() {
componentHandler.upgradeAllRegistered();
});
or
$scope.$on('$viewContentLoaded', () => {
$timeout(() => {
componentHandler.upgradeAllRegistered();
})
});