The change or pre-req from CS 641 Foundations of Data Science to CS 601 Programming Methods for Data Science or BS in CS or Equivalent recognizes that the real content needed for 665 is strong programming skills, rather than the knowledge in 641. The new pre-req parallels the pre-req for the coupled undergraduate version CS 465 which has CS 102 as its pre-req.
Farmer, Michael, "2/17/2021: Course Change Form CS 665" (2021). UCC Documents. 18.