Friday, February 12, 2016

SMASS et al

SMASS is a PROLOG agent-sim

eg: "Each actor tries to find a neighbour who is physically weaker, and to take away
some part of that person's wealth."

EOS: leader/follower planning (Deasy is Stephen's leader, Bella is Zoe&co's; Molly is Bloom's, at end Bloomis Stephen's and Molly's?)

"Agents decide the resources to target, the number of agents needed to acquire them, and then seek to make an agreed allocation of agents to resources. A single agent and its following may be assigned several resources to harvest. Plans have explicit estimated numerical payoffs"
"Plan execution is also complex. It involves the setting of a rendezvous point and time, and
the pooling and sharing at the rendezvous of all the resources harvested. Further complex-
ity is created by the possible failure of some or all of the agents to perform the tasks they
have agreed to undertake, and the fact that the whole process is partly recursive -- thus a
subleader will execute its part of a plan by creating and recruiting to a subplan, and so on"
"Any inter-agent relationship is expressed in the EOS model by beliefs within the social
models of the agents concerned. Thus, to say that agents X and Y are in a leader/follower
relationship means that Agent X believes that Agent Y is its leader and vice versa. After
multiple instances of cooperation between two agents (an instance of cooperation occurs
when one agent agrees to take part in another’s plan) an instance of a leader/follower rela-
tionship may come into being. This happens if cooperation is consistently ‘one-way’. If
agent X is repeatedly recruited to agent Y’s plans over a limited period of time, then both
X and Y will come to see themselves as in a leader/follower relationship with Y as the
leader. Leaders tend to generate more highly valued plans, and they attempt to recruit their
followers first to their plan. Followers supply information to their leader about their needs
and awareness of resources, and will always wait for a plan to be proposed by their leader
(but may then reject the leader’s proposal in favour of an alternative). A leader/follower
relationship may dissolve if a follower loses contact with its leader or repeatedly rejects
the leader’s plans."
"to say that agents X and Y are in a leader/follower relationship means that Agent X believes that Agent Y is its leader and vice versa"
"agents’ misbeliefs about the existence of unreal ‘pseudo-agents’, and believed
relationships with them, may inhibit agents from attempting to ‘kill’ one another which
they would otherwise do. All other things equal, the effect is a substantially larger average
population size."

PECS: "These selfish agents belong to different neediness classes, i.e. they
have, for example, different levels  of  wealth, they are free to choose partners for
cooperation, and they typically act with their own interest in mind." (Henry and Martha?)

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