Source

File: wp-includes/class-wp-object-cache.php

public function reset() {
		_deprecated_function( __FUNCTION__, '3.5.0', 'switch_to_blog()' );

		// Clear out non-global caches since the blog ID has changed.
		foreach ( array_keys( $this->cache ) as $group ) {
			if ( ! isset( $this->global_groups[ $group ] ) ) {
				unset( $this->cache[ $group ] );
			}
		}
	}