public SparseVector <double> SentenceToVector(string sentence)
{
var words = this.SentenceToWords(sentence.Trim().ToLowerInvariant());
if (words.Length == 0)
{
return(null);
}
else
{
var wordvec_embeds = new double[this.WordVectorReader.EmbeddingDim];
// Sum all word vectors
foreach (var word in words)
{
var wordEmbeds = this.WordVectorReader.GetWordVector(word);
for (var i = 0; i < this.WordVectorReader.EmbeddingDim; i++)
{
wordvec_embeds[i] += wordEmbeds[i];
}
}
if (words.Length > 1)
{
for (var i = 0; i < this.WordVectorReader.EmbeddingDim; i++)
{
wordvec_embeds[i] = wordvec_embeds[i] / words.Length;
}
}
if (!this.UseHashingTrick)
{
var result = new SparseVector <double>(this.WordVectorReader.EmbeddingDim);
SparseVector <double> .Copy(wordvec_embeds, result);
return(result);
}
else
{
var wordvec_dim = this.WordVectorReader.EmbeddingDim;
var embeddingDim = this.SentenceEmbeddingDim;
var embeds = new SparseVector <double>(embeddingDim);
SparseVector <double> .Copy(wordvec_embeds, embeds, this.WordVectorReader.EmbeddingDim);
if (words.Length > 2)
{
var bigrams = this.GetBiGramList(words);
foreach (var bigram in bigrams)
{
var hash = this.CalculateHash(bigram);
var hash_loc = hash % ((UInt64)this.HashingBins - 1) + 1;
embeds[(int)((UInt64)wordvec_dim + hash_loc)] = 1;
}
}
return(embeds);
}
}
}
/// <summary>
/// Generate next paths.
/// </summary>
/// <returns>
/// An array containing <see cref="PathGenerator.Count"/> <see cref="Path"/>s,
/// wrapped in a (possibly weighted) <see cref="Sample"/>.
/// </returns>
public override Sample Next()
{
Matrix diffusion = new Matrix(Count, TimeSteps);
double weight = 1.0;
for (int i = 0; i < TimeSteps; i++)
{
Sample sample = ArrayGenerator.NextSample(); // get a weighted SparseVector
weight *= sample.Weight;
SparseVector v = (SparseVector)sample.Value;
v.Multiply(Math.Sqrt(TimeDelays.Data[i]));
v.Copy(diffusion.Column(i));
}
Path[] paths = new Path[Count];
for (int j = 0; j < Count; j++)
{
paths[j] = new Path(Times, Drift[j], diffusion.Row(j));
}
return(new Sample(paths, weight));
}
