mirror of
https://github.com/moses-smt/mosesdecoder.git
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122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/***********************************************************************
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Moses - statistical machine translation system
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Copyright (C) 2006-2011 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#include "Subgraph.h"
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#include "Node.h"
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namespace Moses {
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namespace GHKM {
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void Subgraph::GetTargetLeaves(std::vector<const Node *> &result) const
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{
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result.clear();
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GetTargetLeaves(m_root, result);
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}
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void Subgraph::GetTargetLeaves(const Node *root,
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std::vector<const Node *> &result) const
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{
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if (root->GetType() == TARGET || m_leaves.find(root) != m_leaves.end()) {
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result.push_back(root);
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} else {
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const std::vector<Node*> &children = root->GetChildren();
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for (std::vector<Node *>::const_iterator p(children.begin());
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p != children.end(); ++p) {
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GetTargetLeaves(*p, result);
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}
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}
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}
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int Subgraph::CountNodes(const Node *n) const
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{
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if (n->GetType() != TREE) {
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return 0;
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}
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if (IsTrivial()) {
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return 1;
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}
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int count = 1;
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const std::vector<Node*> &children = n->GetChildren();
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for (std::vector<Node *>::const_iterator p = children.begin();
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p != children.end(); ++p) {
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const Node *child = *p;
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if (m_leaves.find(child) == m_leaves.end()) {
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count += CountNodes(child);
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} else if (child->GetType() == TREE) {
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++count;
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}
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}
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return count;
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}
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int Subgraph::CalcSize(const Node *n) const
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{
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if (n->GetType() != TREE || n->IsPreterminal()) {
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return 0;
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}
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if (IsTrivial()) {
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return 1;
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}
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int count = 1;
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const std::vector<Node*> &children = n->GetChildren();
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for (std::vector<Node *>::const_iterator p = children.begin();
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p != children.end(); ++p) {
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if (m_leaves.find(*p) == m_leaves.end()) {
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count += CalcSize(*p);
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}
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}
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return count;
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}
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int Subgraph::CalcDepth(const Node *n) const
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{
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if (n->GetType() != TREE || n->IsPreterminal() || m_leaves.empty()) {
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return 0;
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}
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int maxChildDepth = 0;
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const std::vector<Node*> &children = n->GetChildren();
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for (std::vector<Node *>::const_iterator p = children.begin();
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p != children.end(); ++p) {
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if (m_leaves.find(*p) == m_leaves.end()) {
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maxChildDepth = std::max(maxChildDepth, CalcDepth(*p));
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}
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}
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return maxChildDepth + 1;
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}
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float Subgraph::CalcPcfgScore() const
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{
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if (m_root->GetType() != TREE || m_leaves.empty()) {
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return 0.0f;
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}
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float score = m_root->GetPcfgScore();
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for (std::set<const Node *>::const_iterator p = m_leaves.begin();
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p != m_leaves.end(); ++p) {
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const Node *leaf = *p;
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if (leaf->GetType() == TREE) {
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score -= leaf->GetPcfgScore();
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}
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}
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return score;
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}
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} // namespace Moses
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} // namespace GHKM
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