public static IEnumerable <TransitionEmissions> BuildTransitionEmissionsFromBrownText()
{
var assembly = Assembly.GetExecutingAssembly();
using (var fileStream = assembly.GetManifestResourceStream(Brown_Ca01File)) {
if (fileStream == null)
{
throw new InvalidOperationException("brown-ca01.txt should exist. It doesn't, so you're seeing this error");
}
using (var stringReader = new StreamReader(fileStream)) {
string line = stringReader.ReadLine();
while (line != null)
{
var transitionEmissions = new TransitionEmissions();
foreach (var tuple in ReadLine(line))
{
transitionEmissions.AddTransitionEmission(tuple.Item1, tuple.Item2);
}
yield return(transitionEmissions);
line = stringReader.ReadLine();
}
}
}
}
public void ExceptionThrownWhenEmissionIsNull()
{
// arrange
var transitionEmission = new TransitionEmissions();
// act
transitionEmission.AddTransitionEmission(Transition, null);
// assert - exception
}
public void RecordsAddedWhenAccessedThroughMethod()
{
// arrange
var transitionEmission = new TransitionEmissions();
// act
transitionEmission.AddTransitionEmission(Transition, Emission);
// assert
Assert.AreEqual(1, transitionEmission.Records.Count);
Assert.AreEqual(Transition, transitionEmission.Records [0].Transition);
Assert.AreEqual(Emission, transitionEmission.Records [0].Emission);
}
public void HiddenMarkovModelInstantiatedWithProperTransitionEmissions()
{
// arrange
const string Transition = "noun";
const string Emission = "Cardio";
var transitionEmissions = new TransitionEmissions();
transitionEmissions.AddTransitionEmission(Transition, Emission);
var transitionEmissionsList = new List <TransitionEmissions> ();
transitionEmissionsList.Add(transitionEmissions);
var hmm = new HiddenMarkovModelBuilder(transitionEmissionsList).Build();
// act
var result = hmm.GetEmissions(new[] { Transition });
// assert
Assert.AreEqual(1, result.Count());
Assert.AreEqual(Emission, result.First().Emissions.First());
}
private List <TransitionEmissions> BuildTestTransitionEmissions()
{
// http://nlp.stanford.edu:8080/parser/index.jsp - Thank You!
// My dog also likes eating sausage.
// My/PRP$ dog/NN also/RB likes/VBZ eating/VBG sausage/NN ./.
var firstTransitionEmissions = new TransitionEmissions();
firstTransitionEmissions.AddTransitionEmission("PRP$", "My");
firstTransitionEmissions.AddTransitionEmission("NN", "dog");
firstTransitionEmissions.AddTransitionEmission("RB", "also");
firstTransitionEmissions.AddTransitionEmission("VBZ", "likes");
firstTransitionEmissions.AddTransitionEmission("VBG", "eating");
firstTransitionEmissions.AddTransitionEmission("NN", "sausage");
firstTransitionEmissions.AddTransitionEmission(".", ".");
// My/PRP$ dog/NN likes/VBZ eating/VBG turkey/NN ./.
var secondTransitionEmissions = new TransitionEmissions();
secondTransitionEmissions.AddTransitionEmission("PRP$", "My");
secondTransitionEmissions.AddTransitionEmission("NN", "dog");
secondTransitionEmissions.AddTransitionEmission("VBZ", "likes");
secondTransitionEmissions.AddTransitionEmission("VBG", "eating");
secondTransitionEmissions.AddTransitionEmission("NN", "turkey");
secondTransitionEmissions.AddTransitionEmission(".", ".");
// My/PRP$ dog/NN likes/VBZ walking/VBG ./.
var thirdTransitionEmissions = new TransitionEmissions();
thirdTransitionEmissions.AddTransitionEmission("PRP$", "My");
thirdTransitionEmissions.AddTransitionEmission("NN", "dog");
thirdTransitionEmissions.AddTransitionEmission("VBZ", "likes");
thirdTransitionEmissions.AddTransitionEmission("VBG", "walking");
thirdTransitionEmissions.AddTransitionEmission(".", ".");
return(new List <TransitionEmissions> {
firstTransitionEmissions, secondTransitionEmissions, thirdTransitionEmissions
});
}
