我在下面有一个csv。
UID CID
u-1 c-1
u-1 c-2
u-1 c-3
u-2 c-2
u-2 c-1
u-2 c-3
u-3 c-3
u-3 c-2
u-3 c-2
我想要独特的小组计数。
ex) c-1, c-2, c-3 is one
c-2, c-1, c-3 is two
c-3, 3-2, c-1 is three
c-1, c-2, c-3 is already group
thus, unique group count is 3.
CID很多。 of couse，UID ..