How does Dolfin partition the mesh, and how to control it?

mesh
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I would like to know if it is possible to control, and how does Dolfin partition the mesh.

I found that it is possible to choose between SCOTCH and ParMETIS using the ‘mesh_partitioner’ key in the parameters dictionary, as well as setting the '‘partitioning_approach’ for ParMETIS, which defaults to ‘PARTITION’.

Is is possible to change the partitioning scheme through Dolfin? What is the default approach, and what are the alternatives, if any?

Thank you,