Focal Search
Focal Search is a classical bounded suboptimal search method that maintains a FOCAL candidate set containing nodes satisfying a threshold condition. Within this restricted node set, a secondary heuristic guides node selection, balancing solution quality against search speed.
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Google apps such as Gmail do not provide per-email content indexing to iOS Spotlight Search, preventing Siri from directly retrieving their content
Focal Search maintains a FOCAL candidate set containing all frontier nodes that satisfy the threshold w·f_min, and uses a heuristic function within this set for guided selection.
In FS's deterministic strategy, the lower bound f_min may remain unchanged for an extended period, preventing the FOCAL set from expanding and causing the search to fall into an inefficient plateau.
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Google apps such as Gmail do not provide per-email content indexing to iOS Spotlight Search, preventing Siri from directly retrieving their content
50%UnverifiedFocal Search maintains a FOCAL candidate set containing all frontier nodes that satisfy the threshold w·f_min, and uses a heuristic function within this set for guided selection.
50%UnverifiedIn FS's deterministic strategy, the lower bound f_min may remain unchanged for an extended period, preventing the FOCAL set from expanding and causing the search to fall into an inefficient plateau.
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