$url = $_SERVER["REQUEST_URI"];
$isItProfile = strpos($url, 'change-avatar');

if ($isItProfile!==false) {
	function avatar_size(){
	   define( 'BP_AVATAR_FULL_WIDTH', '150');
	   define( 'BP_AVATAR_FULL_HEIGHT', '150' );
	}
	add_action('bp_init', 'avatar_size', 2);
} else {
	function group_thumbnail_size(){
	   define( 'BP_AVATAR_FULL_WIDTH', '185');
	   define( 'BP_AVATAR_FULL_HEIGHT', '125' );
	}
	add_action('bp_init', 'group_thumbnail_size', 2);
}