Azure: Compute list nodes without cloud service parameter

It looks like Azure Virtual Machines supports creating nodes without an underlying Cloud Service, assuming this was an old limitation. 

I have created virtual machines on Azure, but have never created a Cloud Service. Can't figure out from documentation how to list these nodes, since the list_nodes() method requires a Cloud Service name.

>>> driver.ex_list_cloud_services()
<HostedServices items=[]>