internal GestureRecognizer(HMMModel model)
{
hmm = new DiscreteHMM <int, int>(model, symbols, states);
}
public DiscreteHMM(HMMModel model, T[] symbolsList, U[] statesList)
{
#region Check the symbols list validity
if (symbolsList != null)
{
for (int i = 0; i < symbolsList.Length; i++)
{
if (symbolsList[i] == null)
{
throw new ArgumentException("Null symbols are not supported in the symbols list.");
}
//TODO: Check if all the symbols are unique
}
}
else
{
throw new ArgumentNullException("symbolsList");
}
#endregion
#region Check the states list validity
if (statesList != null)
{
for (int i = 0; i < statesList.Length; i++)
{
if (statesList[i] == null)
{
throw new ArgumentException("Null states are not supported in the states list.");
}
//TODO: Check if all the states are unique
}
}
else
{
throw new ArgumentNullException("statesList");
}
#endregion
symbols = symbolsList;
states = statesList;
#region Create the probability matrices
stateTransitionProbabilities = new double[statesList.Length, statesList.Length];
initialStateDistribution = new double[statesList.Length];
symbolDistributionDiscrete = new double[statesList.Length, symbolsList.Length];
double evenSymProb = 1.0 / (double)symbolsList.Length;
if (model == HMMModel.Ergodic)
{
double evenStateProb = 1.0 / (double)statesList.Length;
//Setup the initial state distribution
for (int i = 0; i < statesList.Length; i++)
{
initialStateDistribution[i] = evenStateProb;
}
//Setup the state transition probabilities
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < statesList.Length; j++)
{
stateTransitionProbabilities[i, j] = evenStateProb;
}
}
//Setup the symbol distribution
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < symbolsList.Length; j++)
{
symbolDistributionDiscrete[i, j] = evenSymProb;
}
}
}
else if (model == HMMModel.LeftToRight)
{
//Setup the initial state distribution
for (int i = 0; i < statesList.Length; i++)
{
if (i == 0)
{
//initialStateDistribution[i] = 1.0;
initialStateDistribution[i] = 0.9;
}
else
{
//initialStateDistribution[i] = 0;
initialStateDistribution[i] = 0.1 / (statesList.Length - 1);
}
}
//Setup the state transition probabilities
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < statesList.Length; j++)
{
if (j == i || j == i + 1)
{
stateTransitionProbabilities[i, j] = 0.5;
}
else
{
stateTransitionProbabilities[i, j] = 0.0;
}
}
}
//Setup the symbol distribution
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < symbolsList.Length; j++)
{
symbolDistributionDiscrete[i, j] = evenSymProb;
}
}
}
else if (model == HMMModel.LeftToRightAll)
{
//Setup the initial state distribution
for (int i = 0; i < statesList.Length; i++)
{
if (i == 0)
{
//initialStateDistribution[i] = 1.0;
initialStateDistribution[i] = 0.9;
}
else
{
//initialStateDistribution[i] = 0;
initialStateDistribution[i] = 0.1 / (statesList.Length - 1);
}
}
//Setup the state transition probabilities
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < statesList.Length; j++)
{
if (j >= i)
{
stateTransitionProbabilities[i, j] = 1.0 / (double)(statesList.Length - i);
}
else
{
stateTransitionProbabilities[i, j] = 0.0;
}
}
}
//Setup the symbol distribution
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < symbolsList.Length; j++)
{
symbolDistributionDiscrete[i, j] = evenSymProb;
}
}
}
else if (model == HMMModel.LeftToRight2)
{
//Setup the initial state distribution
for (int i = 0; i < statesList.Length; i++)
{
if (i == 0)
{
//initialStateDistribution[i] = 1.0;
initialStateDistribution[i] = 0.9;
}
else
{
//initialStateDistribution[i] = 0;
initialStateDistribution[i] = 0.1 / (statesList.Length - 1);
}
}
//Setup the state transition probabilities
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < statesList.Length; j++)
{
if (j == i || j == i + 1 || j == i + 2)
{
stateTransitionProbabilities[i, j] = 1.0 / 3.0;
}
else
{
stateTransitionProbabilities[i, j] = 0.0;
}
}
}
//Setup the symbol distribution
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < symbolsList.Length; j++)
{
symbolDistributionDiscrete[i, j] = evenSymProb;
}
}
}
else if (model == HMMModel.LeftToRight2Loop)
{
//Setup the initial state distribution
for (int i = 0; i < statesList.Length; i++)
{
if (i == 0)
{
//initialStateDistribution[i] = 1.0;
initialStateDistribution[i] = 0.9;
}
else
{
//initialStateDistribution[i] = 0;
initialStateDistribution[i] = 0.1 / (statesList.Length - 1);
}
}
//Setup the state transition probabilities
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < statesList.Length; j++)
{
if (j == i || j == i + 1 || j == i + 2)
{
stateTransitionProbabilities[i, j] = 1 / 3.0;
}
//else if (i == statesList.Length - 2 && j == 0)
//{
// stateTransitionProbabilities[i, j] = 1 / 3.0;
//}
else if (i == statesList.Length - 1 && (j == 0 /*|| j == 1*/))
{
stateTransitionProbabilities[i, j] = 1 / 3.0;
}
else
{
stateTransitionProbabilities[i, j] = 0.0;
}
}
}
//Setup the symbol distribution
for (int i = 0; i < statesList.Length; i++)
{
for (int j = 0; j < symbolsList.Length; j++)
{
symbolDistributionDiscrete[i, j] = evenSymProb;
}
}
}
#endregion
}
