Vertexnum?

[Han Gao]

Hi I'm just wondering in the addVertex() method, how exactly is the
parameter vertexnum? If I'm using the adjacency matrix implementation
of size n, will this vertexnum always be n (counting from 0) since all
the vertices are numbered as 0,1,2,3... ? Thanks.

[Keith Newman]

My understanding is that the vertexnum will be an arbitrary integer
representing a user. For example, in the Twitter Small data set, the
first line reads:

45914942 25871621 5

Which means an edge is made from user 45914942 to user 25871621 with a
weight as 5. To balance things out, I used the vertexnums as keys for
a hashmap and then made the values an increasing integer, so you can
still organize your Adjacency Matrix in terms of simple integers while
maintaining the user vertex numbers.

[Steve Spagnola]

Yes, the input will be an arbitrary (and large) integer corresponding
to Twitter. As discussed before, its a good idea to map to a lower
and continuous range, but also make sure that you have a way to map
back for the makeRecommendation method.