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autopilot/interface+prefattach: scale node scores to range [0.0, 1.0]

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To prepare for combinning scores from multiple heuristics, we require the
scores returned from the NodeSores API to be in the range [0.0, 1.0].

The prefAttach heuristic is altered to scale the returned scores such
that the most connected node in the grpah is given a score of 1.0.
This commit is contained in:
Johan T. Halseth
2019-01-09 09:14:45 +01:00
parent 4537c63dbd
commit 592ce92c72
3 changed files with 24 additions and 17 deletions
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11
autopilot/interface.go
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@@ -125,11 +125,12 @@ type AttachmentHeuristic interface {
// returned channel candidates maps the NodeID to a NodeScore for the
// node.
//
// The scores will be in the range [0, M], where 0 indicates no
// improvement in connectivity if a channel is opened to this node,
// while M is the maximum possible improvement in connectivity. The
// size of M is up to the implementation of this interface, so scores
// must be normalized if compared against other implementations.
// The returned scores will be in the range [0, 1.0], where 0 indicates
// no improvement in connectivity if a channel is opened to this node,
// while 1.0 is the maximum possible improvement in connectivity. The
// implementation of this interface must return scores in this range to
// properly allow the autopilot agent to make a reasonable choice based
// on the score from multiple heuristics.
//
// NOTE: A NodeID not found in the returned map is implicitly given a
// score of 0.