markovBlanket_tpl.h

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 *       - Christophe GONZALES(_at_AMU)                                     *
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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#pragma once
 
#include <agrum/base/graphs/algorithms/generic/markovBlanket.h>
 
namespace gum::graph {
 
  template < GUM_DiGraphable G >
  DAG markovBlanket(const G& g, NodeId node, int level) {
    if (!g.exists(node))
      GUM_ERROR(InvalidArgument, "Node " << node << " does not exist in the graph.")
    if (level < 1) GUM_ERROR(InvalidArgument, "level must be >= 1")
 
    DAG mb;
 
    auto step = [&](NodeId n, NodeSet& next_frontier) {
      for (const auto par: g.parents(n)) {
        if (!mb.existsNode(par)) {
          mb.addNodeWithId(par);
          next_frontier.insert(par);
        }
        if (!mb.existsArc(par, n)) mb.addArc(par, n);
      }
      for (const auto chi: g.children(n)) {
        if (!mb.existsNode(chi)) {
          mb.addNodeWithId(chi);
          next_frontier.insert(chi);
        }
        if (!mb.existsArc(n, chi)) mb.addArc(n, chi);
        for (const auto opar: g.parents(chi)) {
          if (opar == n) continue;
          if (!mb.existsNode(opar)) {
            mb.addNodeWithId(opar);
            next_frontier.insert(opar);
          }
          if (!mb.existsArc(opar, chi)) mb.addArc(opar, chi);
        }
      }
    };
 
    mb.addNodeWithId(node);
    NodeSet frontier;
    step(node, frontier);
 
    for (int lv = 1; lv < level && !frontier.empty(); ++lv) {
      NodeSet next;
      for (const auto n: frontier)
        step(n, next);
      frontier = std::move(next);
    }
 
    return mb;
  }
 
}   // namespace gum::graph