The source code and dockerfile for the GSW2024 AI Lab.
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// asynchronous leader election
// 4 processes
// gxn/dxp 29/01/01
mdp
const int N = 4; // number of processes
module process1
// COUNTER
c1 : [0..N-1];
// STATES
s1 : [0..4];
// 0 make choice
// 1 have not received neighbours choice
// 2 active
// 3 inactive
// 4 leader
// PREFERENCE
p1 : [0..1];
// VARIABLES FOR SENDING AND RECEIVING
receive1 : [0..2];
// not received anything
// received choice
// received counter
sent1 : [0..2];
// not send anything
// sent choice
// sent counter
// pick value
[] (s1=0) -> 0.5 : (s1'=1) & (p1'=0) + 0.5 : (s1'=1) & (p1'=1);
// send preference
[p12] (s1=1) & (sent1=0) -> (sent1'=1);
// receive preference
// stay active
[p41] (s1=1) & (receive1=0) & !( (p1=0) & (p4=1) ) -> (s1'=2) & (receive1'=1);
// become inactive
[p41] (s1=1) & (receive1=0) & (p1=0) & (p4=1) -> (s1'=3) & (receive1'=1);
// send preference (can now reset preference)
[p12] (s1=2) & (sent1=0) -> (sent1'=1) & (p1'=0);
// send counter (already sent preference)
// not received counter yet
[c12] (s1=2) & (sent1=1) & (receive1=1) -> (sent1'=2);
// received counter (pick again)
[c12] (s1=2) & (sent1=1) & (receive1=2) -> (s1'=0) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0);
// receive counter and not sent yet (note in this case do not pass it on as will send own counter)
[c41] (s1=2) & (receive1=1) & (sent1<2) -> (receive1'=2);
// receive counter and sent counter
// only active process (decide)
[c41] (s1=2) & (receive1=1) & (sent1=2) & (c4=N-1) -> (s1'=4) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0);
// other active process (pick again)
[c41] (s1=2) & (receive1=1) & (sent1=2) & (c4<N-1) -> (s1'=0) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0);
// send preference (must have received preference) and can now reset
[p12] (s1=3) & (receive1>0) & (sent1=0) -> (sent1'=1) & (p1'=0);
// send counter (must have received counter first) and can now reset
[c12] (s1=3) & (receive1=2) & (sent1=1) -> (s1'=3) & (p1'=0) & (c1'=0) & (sent1'=0) & (receive1'=0);
// receive preference
[p41] (s1=3) & (receive1=0) -> (p1'=p4) & (receive1'=1);
// receive counter
[c41] (s1=3) & (receive1=1) & (c4<N-1) -> (c1'=c4+1) & (receive1'=2);
// done
[done] (s1=4) -> (s1'=s1);
// add loop for processes who are inactive
[done] (s1=3) -> (s1'=s1);
endmodule
module process2=process1[s1=s2,p1=p2,c1=c2,sent1=sent2,receive1=receive2,p12=p23,p41=p12,c12=c23,c41=c12,p4=p1,c4=c1] endmodule
module process3=process1[s1=s3,p1=p3,c1=c3,sent1=sent3,receive1=receive3,p12=p34,p41=p23,c12=c34,c41=c23,p4=p2,c4=c2] endmodule
module process4=process1[s1=s4,p1=p4,c1=c4,sent1=sent4,receive1=receive4,p12=p41,p41=p34,c12=c41,c41=c34,p4=p3,c4=c3] endmodule
// reward - expected number of rounds (equals the number of times a process receives a counter)
rewards "rounds"
[c12] true : 1;
endrewards
label "elected" = s1=4|s2=4|s3=4|s4=4;