def get_activities_counts(bpmn_graph):
return {<EOL>"<STR_LIT>": get_nodes_count(bpmn_graph,<EOL>node_type="<STR_LIT>"),<EOL>"<STR_LIT>": get_nodes_count(bpmn_graph,<EOL>node_type="<STR_LIT>"),<EOL>}<EOL>
Returns the count of the different types of activities
in the BPMNDiagramGraph instance.

:param bpmn_graph: an instance of BpmnDiagramGraph representing BPMN model.
:return: count of the different types of activities in the BPMNDiagramGraph instance