Randomizing wp_tag_cloud() in child theme

I’m trying to write a wordpress function code in my child theme that randomizes the words in the word cloud where previously it was alphabetized.

The code Im using is below, which doesn’t work.

// add_filter('wp_tag_cloud_args', 'my_wp_tag_cloud_args_filter'); function my_wp_nav_menu_args_filter($  args) {     $  args['order'] = 'RAND';     // do something     return $  args; } // 

I’m able to update the wp_tag_cloud()’s default (‘Order’ = ‘RAND’) args in wp-includes/category-template.php but I know that any changes will get replaced. The change work when in that file.

How can I move those set of changes to my wordpress child theme?