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// extern crate rand;
// extern crate time;
// extern crate columnar;
// extern crate timely;
// extern crate differential_dataflow;
//
// use std::mem;
//
// use std::hash::Hash;
// use timely::example_shared::*;
// use timely::example_shared::operators::*;
// use timely::communication::ThreadCommunicator;
//
// use rand::{Rng, SeedableRng, StdRng};
//
// use differential_dataflow::Collection;
// use differential_dataflow::collection_trace::lookup::UnsignedInt;
// use differential_dataflow::collection_trace::LeastUpperBound;
//
// use differential_dataflow::operators::*;
//
//
// fn pagerank<G: GraphBuilder, U: UnsignedInt>(edges: &Collection<G, (U, U)>) -> Collection<G, U>
// where G::Timestamp: LeastUpperBound+Hash {
//
// let degrs = edges.map(|(x,w)| (x.0,w))
// .consolidate(|||x| *x)
// .group_by_u(|x| (x,()), |k,v| (*k,*v), |_,s,t| t.push((s[0].1, 1)))
// .inspect_batch(|_t, xs| println!("degrees: {:?}", xs.len()))
// ;
//
// // start everyone with 100 units of "rank".
// edges.group_by_u(|x| (x.0,()), |k,_| *k, |_,_,t| { t.push(((), 10000)) })
// .iterate(u32::max_value(), |||x| *x, |ranks| {
//
// let degrs = degrs.enter(&ranks.scope());
// let edges = edges.enter(&ranks.scope());
//
// // pair surfers with the out-degree of their location
// ranks.join_u(°rs, |n| (n,()), |nc| nc, |n,_,c| (*n,*c))
// .inspect_batch(|t, xs| println!("join1ed at {:?}: {:?}", t, xs.len()))
// .group_by_u(|x| x, |k,_| *k, |_,s,t| t.push(((), s[0].1 / s[0].0)))
// .inspect_batch(|t, xs| println!("grouped at {:?}: {:?}", t, xs.len()))
// .join_u(&edges, |n| (n,()), |e| e, |_,_,d| *d)
// .inspect_batch(|t, xs| println!("join2ed at {:?}: {:?}\n", t, xs.len()))
// })
// }