/// <summary>
/// Decodes the lemma from the word and the induced lemma class.
/// </summary>
/// <param name="tokens">The array of token</param>
/// <param name="preds">The predicted lemma classes.</param>
/// <returns>An array of decoded lemmas.</returns>
public string[] DecodeLemmas(string[] tokens, string[] preds)
{
if (tokens == null)
{
throw new ArgumentNullException(nameof(tokens));
}
if (preds == null)
{
throw new ArgumentNullException(nameof(preds));
}
if (tokens.Length != preds.Length)
{
throw new ArgumentException("The arguments must have the same length.");
}
var lemmas = new List <string>(tokens.Length);
for (var i = 0; i < tokens.Length; i++)
{
var lemma = LemmatizerUtils.DecodeShortestEditScript(tokens[i].ToLowerInvariant(), preds[i]);
if (string.IsNullOrEmpty(lemma))
{
lemma = "_";
}
lemmas.Add(lemma);
}
return(lemmas.ToArray());
}
/// <summary>
/// Returns the next lemma sample object. Calling this method repeatedly until it returns, <c>null</c> will return each
/// object from the underlying source exactly once.
/// </summary>
/// <returns>The next lemma sample or <c>null</c> to signal that the stream is exhausted.</returns>
public override LemmaSample Read()
{
var tokens = new List <string>();
var tags = new List <string>();
var lemmas = new List <string>();
for (var line = Samples.Read(); !string.IsNullOrEmpty(line); line = Samples.Read())
{
var parts = line.Split('\t');
if (parts.Length != 3)
{
continue; // skip corrupt line
}
tokens.Add(parts[0]);
tags.Add(parts[1]);
lemmas.Add(LemmatizerUtils.GetShortestEditScript(parts[0], parts[2]));
}
return(tokens.Count > 0 ? new LemmaSample(tokens.ToArray(), tags.ToArray(), lemmas.ToArray()) : null);
}