module Rand:Random graphssig..end
val graph : ?loops:bool -> v:int -> e:int -> unit -> Sig_pack.S.trandom v e generates a random with v vertices and e edges.val labeled : (Sig_pack.S.V.t -> Sig_pack.S.V.t -> Sig_pack.S.E.label) ->
?loops:bool -> v:int -> e:int -> unit -> Sig_pack.S.trandom_labeled f is similar to random except that edges are
labeled using function f