GitLab

* Added code for Rectifying (TypeError: unhashable type: 'slice') when copying file

* 1) added distributed preprocessing code to create ParMetis Input from CSV files
2) add code to run pm_dglpart on multiple machines
3) added support for recreating heteregenous graph from homo geneous graph based on dropped edges, as ParMetis currently only supports homogeneous graphs

* move to pandas

* Added comments and remove drop_duplicates as it was redundant

* Addressed Pr Comments

* Rename variable

* Added comment

* Added comment

* updated ReadMe
Co-authored-by: Ankit Garg <gaank@amazon.com>
Co-authored-by: Da Zheng <zhengda1936@gmail.com>