private static void MatchChoiceByIndex(List <Choice> list, List <ModelResult <FoundChoice> > matched, ModelResult <FoundChoice> match)
{
try
{
var index = int.Parse(match.Resolution.Value) - 1;
if (index >= 0 && index < list.Count)
{
var choice = list[index];
matched.Add(new ModelResult <FoundChoice>
{
Start = match.Start,
End = match.End,
TypeName = "choice",
Text = match.Text,
Resolution = new FoundChoice
{
Value = choice.Value,
Index = index,
Score = 1.0f
}
});
}
}
catch (Exception) { }
}
private static ModelResult <FoundValue> MatchValue(List <Token> tokens, int maxDistance, FindValuesOptions options, int index, string value, List <Token> vTokens, int startPos)
{
// Match value to utterance and calculate total deviation.
// - The tokens are matched in order so "second last" will match in
// "the second from last one" but not in "the last from the second one".
// - The total deviation is a count of the number of tokens skipped in the
// match so for the example above the number of tokens matched would be
// 2 and the total deviation would be 1.
var matched = 0;
var totalDeviation = 0;
var start = -1;
var end = -1;
foreach (var token in vTokens)
{
// Find the position of the token in the utterance.
var pos = IndexOfToken(tokens, token, startPos);
if (pos >= 0)
{
// Calculate the distance between the current tokens position and the previous tokens distance.
var distance = matched > 0 ? pos - startPos : 0;
if (distance <= maxDistance)
{
// Update count of tokens matched and move start pointer to search for next token after
// the current token.
matched++;
totalDeviation += distance;
startPos = pos + 1;
// Update start & end position that will track the span of the utterance that's matched.
if (start < 0)
{
start = pos;
}
end = pos;
}
}
}
// Calculate score and format result
// - The start & end positions and the results text field will be corrected by the caller.
ModelResult <FoundValue> result = null;
if (matched > 0 && (matched == vTokens.Count || options.AllowPartialMatches))
{
// Percentage of tokens matched. If matching "second last" in
// "the second from last one" the completeness would be 1.0 since
// all tokens were found.
var completeness = matched / vTokens.Count;
// Accuracy of the match. The accuracy is reduced by additional tokens
// occurring in the value that weren't in the utterance. So an utterance
// of "second last" matched against a value of "second from last" would
// result in an accuracy of 0.5.
var accuracy = (matched / (matched + totalDeviation));
// The final score is simply the completeness multiplied by the accuracy.
var score = completeness * accuracy;
// Format result
result = new ModelResult <FoundValue>
{
Start = start,
End = end,
TypeName = "value",
Resolution = new FoundValue
{
Value = value,
Index = index,
Score = score
}
};
}
return(result);
}
