//Regression.
public double RegressEventSeries(DiscreteEventSeries <A> series)
{
//It's probably faster to convert the series to a multiset before scoring, particularly when many things are repeated.
Multiset <Kmer <A> > seriesMultiset = series.ToMultisetKmer(k);
return(regressor.RegressEventSeries(seriesMultiset));
}
public static Multiset <Ty> ToMultiset <Ty>(this DiscreteEventSeries <Ty> series)
{
Multiset <Ty> multiset = new Multiset <Ty>();
series.data.ForEach(a => multiset.Add(a)); //Doesn't use the above, as an optimization.
return(multiset);
}
public static MultisetKmer <Ty> ToMultisetVarKmer <Ty>(this DiscreteEventSeries <Ty> series, int k)
{
MultisetKmer <Ty> multiset = new MultisetKmer <Ty>(k);
multiset.AddDiscreteEventSeriesVarKmer(series, k);
return(multiset);
}
public static string ClassifyItem <Ty>(IFeatureSynthesizer <Ty> synth, DiscreteEventSeries <Ty> item, string nameField)
{
double[] scores = synth.SynthesizeFeaturesSumToOne(item);
double max = scores.Max();
//TODO don't report ambiguous cases.
return(item.labels[nameField] + ": " + synth.SynthesizeLabelFeature(item) + "" +
"(" + max + " confidence)");
}
//Regression.
public double RegressEventSeries(DiscreteEventSeries <A> series)
{
double score = 0;
for (int k = 1; k <= maxK; k++) //For locality!
{
Multiset <Kmer <A> > ms = series.ToMultisetKmer(k);
score += regressor.RegressEventSeries(ms);
}
return(score);
}
//Synthesize features for an item.
public double[] SynthesizeFeatures(DiscreteEventSeries <string> item)
{
//"Word Count;Mean Sentence Length;Orthographical Error Rate;Formality;Textspeak"
return(new[] {
item.data.Length,
item.data.Length / (double)item.data.Where(word => stops.Contains(word)).Count(),
item.data.Where(word => englishSpellingErrors.Contains(word.ToLower())).Count() / (double)item.data.Length,
item.data.Where(word => englishFormals.Contains(word.ToLower())).Count() / (double)item.data.Length,
item.data.Where(word => textSpeak.Contains(word.ToLower())).Count() / (double)item.data.Length
});
}
//TODO .NET 4.5 only.
/*
* public static DiscreteEventSeries<string> processEntryFromZipArchive (ZipArchive archive, Dictionary<string, string> tags, string entry, int logLevel, Func<string, string> textProcessor){
*
* //Load the file as a set of words
* string filePath = directory + tags["filename"];
*
* //Add the file as an entry to the database.
* using (StreamReader sr = File.OpenText(filePath)) {
* return loadEntry (tags, sr, logLevel, textProcessor);
* }
* }
*/
public static DiscreteEventSeries <string> loadEntry(Dictionary <string, string> tags, StreamReader streamReader, int logLevel, Func <string, string> textProcessor)
{
string[] words = DatabaseLoader.loadWordFileRaw(streamReader, textProcessor);
DiscreteEventSeries <string> file = new DiscreteEventSeries <string>(tags, words);
if (logLevel >= 2)
{
Console.WriteLine("Read " + tags.FoldToString(item => item.Key + ":" + item.Value) + ": " + words.Length + " words.");
}
return(file);
}
//Synthesize features for an item.
public double[] SynthesizeFeatures(DiscreteEventSeries <string> item)
{
double wordCount = item.data.Length;
double meanWordLength = item.data.Select(word => word.Length).Average();
double stdevWordLength = item.data.Select(word => (double)word.Length).Stdev(meanWordLength);
double meanSentenceLength = item.data.Length / (double)item.data.Where(word => stops.Contains(word)).Count(); //TODO: Stdev sentence length would be nice.
return(new[] {
wordCount,
meanWordLength,
stdevWordLength,
meanSentenceLength
});
}
/*
* private IEnumerable<TupleStruct<Kmer<Ty>, double>> ExtractUncharacteristicKmersForClass (int classIndex, MultisetKmer<Ty> thisClass, MultisetKmer<Ty> baseline)
* {
* //This will only work with an enormous amount of data for low k.
* }
*/
//Calculation:
//Synthesize features for an item.
//TODO: Enforce contract
public double[] SynthesizeFeatures(DiscreteEventSeries <Ty> item)
{
double[] vals = new double[kmerCount];
MultisetKmer <Ty> ms = item.ToMultisetVarKmer <Ty>(k);
foreach (KeyValuePair <Kmer <Ty>, int> kvp in ms)
{
int index = 0;
if (kmersOntoIndex.TryGetValue(kvp.Key, out index))
{
vals[index] = kvp.Value / (double)ms.Size((int)kvp.Key.Count);
}
}
return(vals);
}
//Synthesize features for an item.
public double[] SynthesizeFeatures(DiscreteEventSeries <string> item)
{
//"Word Count;Mean Sentence Length;Orthographical Error Rate;Formality;Textspeak"
string date;
if (item.labels.TryGetValue(ClassificationCriterion, out date))
{
try{
int[] split = date.Split('-').Select(term => Int32.Parse(term)).ToArray();
return(new[] {
(new DateTime(split[0], split[1], split[2]).Ticks - new DateTime(2000, 1, 1).Ticks) / (10000000.0 * 60 * 60 * 24 * 365.25)
}); //ticks are 100 ns. This converts to years since 2000. Leap years are only partially handled.
}
catch (Exception e) {
//TODO: respond to this error.
}
}
return(new[] { 0.0 }); //TODO: NaN? Other no information representation?
}
/*
* private IEnumerable<TupleStruct<Kmer<Ty>, double>> ExtractUncharacteristicKmersForClass (int classIndex, MultisetKmer<Ty> thisClass, MultisetKmer<Ty> baseline)
* {
* //This will only work with an enormous amount of data for low k.
* }
*/
//Calculation:
//Synthesize features for an item.
//TODO: Enforce contract
public double[] SynthesizeFeatures(DiscreteEventSeries <Ty> item)
{
double[] vals = new double[classCount];
MultisetKmer <Ty> ms = item.ToMultisetVarKmer <Ty>(k);
foreach (KeyValuePair <Kmer <Ty>, int> kvp in ms)
{
Dictionary <int, double> classesWithKvp;
if (learnedCharacteristicKmers.TryGetValue(kvp.Key, out classesWithKvp))
{
//Console.WriteLine ("\tFound kmer " + kvp.Key + ".");
foreach (KeyValuePair <int, double> @class in classesWithKvp)
{
//Console.WriteLine ("\t\tClass " + @class.Key + ", Value " + @class.Value + ", Times " + kvp.Value);
vals[@class.Key] += kvp.Value * @class.Value;
}
}
}
return(vals);
}
//Calculation:
//Synthesize features for an item.
//TODO: Enforce contract
public double[] SynthesizeFeatures(DiscreteEventSeries <Ty> item)
{
return(synths.SelectMany(synth => synth.SynthesizeFeatures(item)).ToArray());
}
//
//Kmer variadic k multiset
//
public static void AddDiscreteEventSeriesVarKmer <Ty>(this MultisetKmer <Ty> multiset, DiscreteEventSeries <Ty> series, int k)
{
Ty[] arr = series.data;
multiset.ConsumeEventSeriesKmer(arr);
}
//
//Kmer fixed k multiset
//
public static void AddDiscreteEventSeriesKmer <Ty>(this Multiset <Kmer <Ty> > multiset, DiscreteEventSeries <Ty> series, int k)
{
//Ty[] arr = series.data.ToArray();
Ty[] arr = series.data; //TODO: This is a decision.
for (int i = 0; i <= arr.Length - k; i++)
{
multiset.Add(new Kmer <Ty>(arr, i, k));
}
}
//Regression
public double RegressEventSeries(DiscreteEventSeries <A> series)
{
//It's probably faster to convert the series to a multiset before scoring, particularly when many things are repeated.
//So we do.
return(RegressEventSeries(series.ToMultiset()));
}
//
//Raw multiset:
//
public static void AddDiscreteEventSeries <Ty>(this Multiset <Ty> multiset, DiscreteEventSeries <Ty> series)
{
//TODO: Is it faster to make the set into a multiset, and then add the counts, so there are fewer lookups in the bigger multiset?
series.data.ForEach(a => multiset.Add(a));
}
public static string SynthesizeLabelFeature <Ty>(this IFeatureSynthesizer <Ty> synth, DiscreteEventSeries <Ty> item)
{
return(synth.GetFeatureSchema()[synth.SynthesizeFeatures(item).MaxIndex()]);
}
public static double[] SynthesizeFeaturesSumToOne <Ty>(this IFeatureSynthesizer <Ty> synth, DiscreteEventSeries <Ty> item)
{
double[] vals = synth.SynthesizeFeatures(item).NormalizeSumInPlace();
//It can happen that all are 0, in which case NaN results.
if (Double.IsNaN(vals[0]))
{
//TODO Higher order function for this!
for (int i = 0; i < vals.Length; i++)
{
vals[i] = 1.0 / vals.Length;
}
}
return(vals);
}
//Name, true class, predicted class, scores, winning score;
public static Tuple <string, string, string, double[], double> classificationInfo(IEventSeriesProbabalisticClassifier <Ty> classifier, string[] classifierSchema, Dictionary <string, int> trueSchemaMapping, DiscreteEventSeries <Ty> data, string nameCriterion, string criterionByWhichToClassify)
{
//scores in the synthesizer scorespace
double[] synthScores = classifier.Classify(data);
int maxIndex = synthScores.MaxIndex();
/*
* classifierSchema = classifier.GetClasses();
* if (maxIndex >= classifierSchema.Length) {
* Console.WriteLine ("Schema not long enough. synthlen, max, schema = " + synthScores.Length + ", " + maxIndex + ", " + classifierSchema.Length);
* Console.WriteLine ("Classifier Info:");
* Console.WriteLine (classifier.ToString ());
* Console.WriteLine ("Synth Features:");
* Console.WriteLine (((SeriesFeatureSynthesizerToVectorProbabalisticClassifierEventSeriesProbabalisticClassifier<string>)classifier).synthesizer.GetFeatureSchema().FoldToString ());
* Console.WriteLine ("Classifier Features:");
* Console.WriteLine (((SeriesFeatureSynthesizerToVectorProbabalisticClassifierEventSeriesProbabalisticClassifier<string>)classifier).classifier.GetClasses().FoldToString ());
* return null;
* }
*/
string predictedClass = classifierSchema[maxIndex];
double maxScore = synthScores[maxIndex];
//convert scores to the true space.
double[] trueScores = new double[trueSchemaMapping.Count];
for (int j = 0; j < classifierSchema.Length; j++)
{
trueScores[trueSchemaMapping[classifierSchema[j]]] = synthScores[j];
}
return(new Tuple <string, string, string, double[], double> (data.labels[nameCriterion], data.labels[criterionByWhichToClassify], predictedClass, trueScores, maxScore));
}
//Helper, score a model on a single element
private static double ScoreModelSingle <Ty>(this IFeatureSynthesizer <Ty> synth, Dictionary <string, int> classRanks, DiscreteEventSeries <Ty> item, int verbosity, string nameCategory = null)
{
int correctClass;
if (!classRanks.TryGetValue(item.labels [synth.ClassificationCriterion], out correctClass))
{
if (verbosity >= 1)
{
Console.WriteLine("Classifier does not contain data for " + item.labels [synth.ClassificationCriterion] + ". Skipping this item.");
}
return(-1);
}
double[] scores = synth.SynthesizeFeaturesSumToOne(item);
if (verbosity >= 2)
{
string toPrint;
if (nameCategory != null)
{
toPrint = item.labels[nameCategory] + " (" + item.labels [synth.ClassificationCriterion] + ")";
}
else
{
toPrint = item.labels [synth.ClassificationCriterion];
}
toPrint += ": " + scores.FoldToString() + " (" + scores [correctClass] + ")";
Console.WriteLine(toPrint);
}
return(scores [correctClass]);
}
//Calculation:
//Synthesize features for an item.
//TODO: Enforce contract
public double[] SynthesizeFeatures(DiscreteEventSeries <Ty> item)
{
return(regressors.Map(r => r.RegressEventSeries(item)).ToArray());
}
public static void ConsumeEventSeries <Ty>(this EventSeriesConsumer <Ty> consumer, DiscreteEventSeries <Ty> series)
{
consumer.ConsumeEventSeries(series.data);
}
public double[] Classify(DiscreteEventSeries <Ty> series)
{
return(classifier.Classify(synthesizer.SynthesizeFeatures(series)));
}
