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Internal/quantify/terminal heuristic (4) #648

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Internal/quantify/terminal heuristic (4) #648

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f0b2977
Simplify 'Terminal Count' heuristic to be linear and ignore idempoten…
SSoelvsten Apr 4, 2024
0ac54cb
Limit by default the number of Partial Sweeps by 1
SSoelvsten Apr 4, 2024
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2 changes: 1 addition & 1 deletion src/adiar/exec_policy.h
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,7 @@ namespace adiar
public:
/// \brief Default value construction.
constexpr transposition_max()
: _value(std::numeric_limits<unsigned char>::max())
: _value(1)
{}

/// \brief Wrap an `unsigned char`
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7 changes: 3 additions & 4 deletions src/adiar/internal/algorithms/quantify.h
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Expand Up @@ -1320,17 +1320,16 @@ namespace adiar::internal
// Terminal Count Heuristics

const size_t false_weight =
1 + Policy::collapse_to_terminal(typename Policy::pointer_type(false));
Policy::collapse_to_terminal(typename Policy::pointer_type(false));

const size_t true_weight =
1 + Policy::collapse_to_terminal(typename Policy::pointer_type(true));
Policy::collapse_to_terminal(typename Policy::pointer_type(true));

const double total_arcs = 2.0 * size;
const double weighted_terminals = false_weight * false_terminals + true_weight * true_terminals;
const size_t exponent = 21.0 * (weighted_terminals / total_arcs) + 0.4;

const typename Policy::label_type terminal_threshold =
(1u << std::min<size_t>(exponent, log2(2 * Policy::max_label))) - 1u;
(250.0 * weighted_terminals) / total_arcs;

// ---------------------------------------------------------------------------------------------
// Shallow Variables Heuristic
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