isomorphic.h
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
#ifndef FST_EXTENSIONS_FAR_ISOMORPHIC_H_
#define FST_EXTENSIONS_FAR_ISOMORPHIC_H_
#include <memory>
#include <string>
#include <fst/extensions/far/far.h>
#include <fst/isomorphic.h>
namespace fst {
template <class Arc>
bool FarIsomorphic(const string &filename1, const string &filename2,
float delta = kDelta, const string &begin_key = string(),
const string &end_key = string()) {
std::unique_ptr<FarReader<Arc>> reader1(FarReader<Arc>::Open(filename1));
if (!reader1) {
LOG(ERROR) << "FarIsomorphic: Cannot open FAR file " << filename1;
return false;
}
std::unique_ptr<FarReader<Arc>> reader2(FarReader<Arc>::Open(filename2));
if (!reader2) {
LOG(ERROR) << "FarIsomorphic: Cannot open FAR file " << filename2;
return false;
}
if (!begin_key.empty()) {
bool find_begin1 = reader1->Find(begin_key);
bool find_begin2 = reader2->Find(begin_key);
if (!find_begin1 || !find_begin2) {
bool ret = !find_begin1 && !find_begin2;
if (!ret) {
VLOG(1) << "FarIsomorphic: Key " << begin_key << " missing from "
<< (find_begin1 ? "second" : "first") << " archive.";
}
return ret;
}
}
for (; !reader1->Done() && !reader2->Done();
reader1->Next(), reader2->Next()) {
const auto &key1 = reader1->GetKey();
const auto &key2 = reader2->GetKey();
if (!end_key.empty() && end_key < key1 && end_key < key2) return true;
if (key1 != key2) {
LOG(ERROR) << "FarIsomorphic: Mismatched keys " << key1 << " and "
<< key2;
return false;
}
if (!Isomorphic(*(reader1->GetFst()), *(reader2->GetFst()), delta)) {
LOG(ERROR) << "FarIsomorphic: FSTs for key " << key1
<< " are not isomorphic";
return false;
}
}
if (!reader1->Done() || !reader2->Done()) {
LOG(ERROR) << "FarIsomorphic: Key "
<< (reader1->Done() ? reader2->GetKey() : reader1->GetKey())
<< " missing form " << (reader2->Done() ? "first" : "second")
<< " archive";
return false;
}
return true;
}
} // namespace fst
#endif // FST_EXTENSIONS_FAR_ISOMORPHIC_H_