public BinaryCount(StreamingQueryable <T> s, double epsilon, int maxSteps) : base(s, epsilon)
{
this.maxSteps = maxSteps;
logT = Convert.ToInt32(Math.Log(maxSteps, 2) + 0.5);
internalEpsilon = epsilon / (double)logT;
LastOutput = Laplace(1.0 / Epsilon);
partialSums = new int[logT];
noisyPartialSums = new double[logT];
}
public UserDensityContinuous(StreamingQueryable <T> s, double epsilon, List <T> universe, double accuracy, double confidence, int maxT)
: base(s, epsilon, universe, accuracy, confidence)
{
this.maxT = maxT;
d = 1.0 / universe.Count + 2 * accuracy;
k = maxT;
rho = 1.0;
logT = Convert.ToInt32(Math.Log(maxT, 2) + 0.5);
epsilon_threshold = rho * logT / epsilon;
//Console.WriteLine("threshold: " + epsilon_threshold);
epsilon_compare = 2 * rho * (k + 1) / epsilon;
epsilon_answer = 2 * rho * (k + 1) / epsilon;
m = 0;
threshold = d + 2 * accuracy;
thresholds = new double[logT];
}
public UserDensity(StreamingQueryable <T> s, double epsilon, List <T> universe, double accuracy, double confidence)
: base(s, epsilon)
{
if (epsilon > 0.5)
{
throw new Exception("epsilon too high");
}
double beta = 1.0 - confidence;
int size = Convert.ToInt32((200 * Math.Log(1.0 / beta, 2)) / (epsilon * epsilon * accuracy * accuracy));
size = Math.Min(universe.Count, size);
IEnumerable <T> sample = universe.OrderBy(x => random.Next()).Take(size);
sampled = new Dictionary <T, bool>(size);
foreach (T item in sample)
{
sampled[item] = sampleInitial();
}
}
public RandomizedResponseCount(StreamingQueryable <T> s, double epsilon) : base(s, epsilon)
{
LastOutput = Laplace(1.0 / Epsilon);
}
public NoisyAverageStreaming(StreamingQueryable <T> s, double epsilon, Expression <Func <T, double> > function) : base(s, epsilon)
{
this.function = function;
}
public BufferedAlgorithm(StreamingQueryable <T> s, double epsilon) : base(s, epsilon)
{
events = new List <T>();
}
public StreamingUserAlgorithm(StreamingQueryable <T> s, double epsilon) : base(s, epsilon)
{
}
public StreamingAlgorithm(StreamingQueryable <T> dataSource, double epsilon)
{
this.DataSource = dataSource;
this.Epsilon = epsilon;
this.eventProcessed = new Semaphore(0, 1);
}