/// <summary>
/// Tokenize input sentence.
/// </summary>
/// <param name="offset">offset of sentence in original input text</param>
/// <param name="text">sentence to tokenize</param>
/// <returns>list of Token</returns>
List <T> CreateTokenList(int offset, string text)
{
var result = new List <T>();
var lattice = ViterbiBuilder.Build(text);
var bestPath = ViterbiSearcher.Search(lattice);
foreach (var node in bestPath)
{
var wordId = node.WordId;
if (node.Type == ViterbiNode.NodeType.Known && wordId == -1)
{
// Do not include BOS/EOS
continue;
}
var token = TokenFactory.CreateToken(
wordId,
node.Surface,
node.Type,
offset + node.StartIndex,
DictionaryMap[node.Type]
);
result.Add(token);
}
return(result);
}
/// <summary>
/// Writes the Viterbi lattice for the provided text to an output stream
///
/// The output is written in <a href="https://en.wikipedia.org/wiki/DOT_(graph_description_language)">DOT</a> format.
///
/// This method is not thread safe
/// </summary>
/// <param name="output">output stream to write to</param>
/// <param name="text">text to create lattice for</param>
public void DebugLattice(Stream output, string text)
{
var lattice = ViterbiBuilder.Build(text);
using (var writer = new StreamWriter(output, Encoding.UTF8, 1024, true))
{
writer.Write(ViterbiFormatter.Format(lattice));
}
}
/// <summary>
/// Tokenizes the provided text and outputs the corresponding Viterbi lattice and the Viterbi path to the provided output stream
///
/// The output is written in <a href="https://en.wikipedia.org/wiki/DOT_(graph_description_language)">DOT</a> format.
///
/// This method is not thread safe
/// </summary>
/// <param name="output">output stream to write to</param>
/// <param name="text">text to tokenize</param>
public void DebugTokenize(Stream output, string text)
{
var lattice = ViterbiBuilder.Build(text);
var bestPath = ViterbiSearcher.Search(lattice);
using (var writer = new StreamWriter(output, Encoding.UTF8, 1024, true))
{
writer.Write(ViterbiFormatter.Format(lattice, bestPath));
}
}
/// <summary>
/// Tokenize input sentence. Up to maxCount different paths of cost at most OPT + costSlack are returned ordered in ascending order by cost, where OPT is the optimal solution.
/// </summary>
/// <param name="text">sentence to tokenize</param>
/// <param name="maxCount">maximum number of paths</param>
/// <param name="costSlack">maximum cost slack of a path</param>
/// <returns>instance of MultiSearchResult containing the tokenizations</returns>
MultiSearchResult CreateMultiSearchResult(string text, int maxCount, int costSlack)
{
var lattice = ViterbiBuilder.Build(text);
return(ViterbiSearcher.SearchMultiple(lattice, maxCount, costSlack));
}
