本文整理汇总了C++中Alphabet::begin方法的典型用法代码示例。如果您正苦于以下问题：C++ Alphabet::begin方法的具体用法？C++ Alphabet::begin怎么用？C++ Alphabet::begin使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Alphabet的用法示例。
在下文中一共展示了Alphabet::begin方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: CreateTagDictionary
void EntityDictionary::CreateTagDictionary(SequenceReader *reader) {
SequenceDictionary::CreateTagDictionary(reader);
// TODO: the SplitEntityTag function should probably be elsewhere and not on
// EntityInstance.
EntityInstance instance;
Alphabet entities;
// Display information about the entity tags.
LOG(INFO) << "Found " << tag_alphabet_.size() << " entity tags:";
for (Alphabet::iterator it = tag_alphabet_.begin();
it != tag_alphabet_.end(); ++it) {
std::string entity_tag = it->first;
LOG(INFO) << entity_tag;
std::string prefix, entity;
instance.SplitEntityTag(it->first, &prefix, &entity);
if (entity != "") entities.Insert(entity);
}
LOG(INFO) << "Entities:";
for (Alphabet::iterator it = entities.begin(); it != entities.end(); ++it) {
LOG(INFO) << it->first;
}
LOG(INFO) << "Computing allowed bigrams...";
// Every bigram is allowed by default.
allowed_bigrams_.assign(1 + tag_alphabet_.size(),
std::vector<bool>(1 + tag_alphabet_.size(), true));
// Now add the BIO-like constraints.
for (Alphabet::iterator it = entities.begin(); it != entities.end(); ++it) {
std::string entity = it->first;
LOG(INFO) << "Processing entity " << entity << "...";
if (static_cast<EntityPipe*>(pipe_)->GetEntityOptions()->tagging_scheme() ==
EntityTaggingSchemes::BIO) {
int tag_begin = tag_alphabet_.Lookup("B-" + entity);
int tag_inside = tag_alphabet_.Lookup("I-" + entity);
if (tag_inside < 0) continue;
// An I-tag can only occur after a B-tag or another I-tag of the same
// entity.
for (int left_tag = -1; left_tag < tag_alphabet_.size(); ++left_tag) {
if (left_tag != tag_begin && left_tag != tag_inside) {
allowed_bigrams_[1 + tag_inside][1 + left_tag] = false;
}
}
} else if (static_cast<EntityPipe*>(pipe_)->GetEntityOptions()->
tagging_scheme() == EntityTaggingSchemes::BILOU) {
int tag_begin = tag_alphabet_.Lookup("B-" + entity);
int tag_inside = tag_alphabet_.Lookup("I-" + entity);
int tag_last = tag_alphabet_.Lookup("L-" + entity);
// I-tags and L-tags can only occur after a B-tag or an I-tag of the same
// entity.
for (int left_tag = -1; left_tag < tag_alphabet_.size(); ++left_tag) {
if (left_tag != tag_begin && left_tag != tag_inside) {
if (tag_inside >= 0) {
allowed_bigrams_[1 + tag_inside][1 + left_tag] = false;
}
if (tag_last >= 0) {
allowed_bigrams_[1 + tag_last][1 + left_tag] = false;
}
}
}
// I-tags and B-tags can only occur before an I-tag or an L-tag of the
// same entity.
for (int right_tag = -1; right_tag < tag_alphabet_.size(); ++right_tag) {
if (right_tag != tag_last && right_tag != tag_inside) {
if (tag_inside >= 0) {
allowed_bigrams_[1 + right_tag][1 + tag_inside] = false;
}
if (tag_begin >= 0) {
allowed_bigrams_[1 + right_tag][1 + tag_begin] = false;
}
}
}
}
}
tag_alphabet_.BuildNames(); // Just to be able to plot readable information...
int num_allowed_bigrams = 0;
for (int tag = -1; tag < tag_alphabet_.size(); ++tag) {
for (int left_tag = -1; left_tag < tag_alphabet_.size(); ++left_tag) {
if (IsAllowedBigram(left_tag, tag)) {
std::string left_tag_name = (left_tag >= 0) ?
tag_alphabet_.GetName(left_tag) : "START";
std::string tag_name = (tag >= 0) ?
tag_alphabet_.GetName(tag) : "STOP";
LOG(INFO) << "Allowed bigram: "
<< left_tag_name
<< " -> "
<< tag_name;
++num_allowed_bigrams;
}
}
}
LOG(INFO) << "Total allowed bigrams: " << num_allowed_bigrams;
ReadGazetteerFiles();
//.........这里部分代码省略.........