private void CheckMarginalsAgainstBruteForce(GraphicalModel model, ConcatVector weights, CliqueTree inference)
{
CliqueTree.MarginalResult result = inference.CalculateMarginals();
double[][] marginals = result.marginals;
ICollection <TableFactor> tableFactors = model.factors.Stream().Map(null).Collect(Collectors.ToSet());
System.Diagnostics.Debug.Assert((tableFactors.Count == model.factors.Count));
// this is the super slow but obviously correct way to get global marginals
TableFactor bruteForce = null;
foreach (TableFactor factor in tableFactors)
{
if (bruteForce == null)
{
bruteForce = factor;
}
else
{
bruteForce = bruteForce.Multiply(factor);
}
}
if (bruteForce != null)
{
// observe out all variables that have been registered
TableFactor observed = bruteForce;
for (int i = 0; i < bruteForce.neighborIndices.Length; i++)
{
int n = bruteForce.neighborIndices[i];
if (model.GetVariableMetaDataByReference(n).Contains(CliqueTree.VariableObservedValue))
{
int value = System.Convert.ToInt32(model.GetVariableMetaDataByReference(n)[CliqueTree.VariableObservedValue]);
// Check that the marginals reflect the observation
for (int j = 0; j < marginals[n].Length; j++)
{
NUnit.Framework.Assert.AreEqual(marginals[n][j], 1.0e-9, j == value ? 1.0 : 0.0);
}
if (observed.neighborIndices.Length > 1)
{
observed = observed.Observe(n, value);
}
else
{
// If we've observed everything, then just quit
return;
}
}
}
bruteForce = observed;
// Spot check each of the marginals in the brute force calculation
double[][] bruteMarginals = bruteForce.GetSummedMarginals();
int index = 0;
foreach (int i_1 in bruteForce.neighborIndices)
{
bool isEqual = true;
double[] brute = bruteMarginals[index];
index++;
System.Diagnostics.Debug.Assert((brute != null));
System.Diagnostics.Debug.Assert((marginals[i_1] != null));
for (int j = 0; j < brute.Length; j++)
{
if (double.IsNaN(brute[j]))
{
isEqual = false;
break;
}
if (Math.Abs(brute[j] - marginals[i_1][j]) > 3.0e-2)
{
isEqual = false;
break;
}
}
if (!isEqual)
{
System.Console.Error.WriteLine("Arrays not equal! Variable " + i_1);
System.Console.Error.WriteLine("\tGold: " + Arrays.ToString(brute));
System.Console.Error.WriteLine("\tResult: " + Arrays.ToString(marginals[i_1]));
}
Assert.AssertArrayEquals(marginals[i_1], 3.0e-2, brute);
}
// Spot check the partition function
double goldPartitionFunction = bruteForce.ValueSum();
// Correct to within 3%
NUnit.Framework.Assert.AreEqual(result.partitionFunction, goldPartitionFunction * 3.0e-2, goldPartitionFunction);
// Check the joint marginals
foreach (GraphicalModel.Factor f in model.factors)
{
NUnit.Framework.Assert.IsTrue(result.jointMarginals.Contains(f));
TableFactor bruteForceJointMarginal = bruteForce;
foreach (int n in bruteForce.neighborIndices)
{
foreach (int i_2 in f.neigborIndices)
{
if (i_2 == n)
{
goto outer_continue;
}
}
if (bruteForceJointMarginal.neighborIndices.Length > 1)
{
bruteForceJointMarginal = bruteForceJointMarginal.SumOut(n);
}
else
{
int[] fixedAssignment = new int[f.neigborIndices.Length];
for (int i_3 = 0; i_3 < fixedAssignment.Length; i_3++)
{
fixedAssignment[i_3] = System.Convert.ToInt32(model.GetVariableMetaDataByReference(f.neigborIndices[i_3])[CliqueTree.VariableObservedValue]);
}
foreach (int[] assn in result.jointMarginals[f])
{
if (Arrays.Equals(assn, fixedAssignment))
{
NUnit.Framework.Assert.AreEqual(result.jointMarginals[f].GetAssignmentValue(assn), 1.0e-7, 1.0);
}
else
{
if (result.jointMarginals[f].GetAssignmentValue(assn) != 0)
{
TableFactor j = result.jointMarginals[f];
foreach (int[] assignment in j)
{
System.Console.Error.WriteLine(Arrays.ToString(assignment) + ": " + j.GetAssignmentValue(assignment));
}
}
NUnit.Framework.Assert.AreEqual(result.jointMarginals[f].GetAssignmentValue(assn), 1.0e-7, 0.0);
}
}
goto marginals_continue;
}
}
outer_break :;
// Find the correspondence between the brute force joint marginal, which may be missing variables
// because they were observed out of the table, and the output joint marginals, which are always an exact
// match for the original factor
int[] backPointers = new int[f.neigborIndices.Length];
int[] observedValue = new int[f.neigborIndices.Length];
for (int i_4 = 0; i_4 < backPointers.Length; i_4++)
{
if (model.GetVariableMetaDataByReference(f.neigborIndices[i_4]).Contains(CliqueTree.VariableObservedValue))
{
observedValue[i_4] = System.Convert.ToInt32(model.GetVariableMetaDataByReference(f.neigborIndices[i_4])[CliqueTree.VariableObservedValue]);
backPointers[i_4] = -1;
}
else
{
observedValue[i_4] = -1;
backPointers[i_4] = -1;
for (int j = 0; j < bruteForceJointMarginal.neighborIndices.Length; j++)
{
if (bruteForceJointMarginal.neighborIndices[j] == f.neigborIndices[i_4])
{
backPointers[i_4] = j;
}
}
System.Diagnostics.Debug.Assert((backPointers[i_4] != -1));
}
}
double sum = bruteForceJointMarginal.ValueSum();
if (sum == 0.0)
{
sum = 1;
}
foreach (int[] assignment_1 in result.jointMarginals[f])
{
int[] bruteForceMarginalAssignment = new int[bruteForceJointMarginal.neighborIndices.Length];
for (int i_2 = 0; i_2 < assignment_1.Length; i_2++)
{
if (backPointers[i_2] != -1)
{
bruteForceMarginalAssignment[backPointers[i_2]] = assignment_1[i_2];
}
else
{
// Make sure all assignments that don't square with observations get 0 weight
System.Diagnostics.Debug.Assert((observedValue[i_2] != -1));
if (assignment_1[i_2] != observedValue[i_2])
{
if (result.jointMarginals[f].GetAssignmentValue(assignment_1) != 0)
{
System.Console.Error.WriteLine("Joint marginals: " + Arrays.ToString(result.jointMarginals[f].neighborIndices));
System.Console.Error.WriteLine("Assignment: " + Arrays.ToString(assignment_1));
System.Console.Error.WriteLine("Observed Value: " + Arrays.ToString(observedValue));
foreach (int[] assn in result.jointMarginals[f])
{
System.Console.Error.WriteLine("\t" + Arrays.ToString(assn) + ":" + result.jointMarginals[f].GetAssignmentValue(assn));
}
}
NUnit.Framework.Assert.AreEqual(result.jointMarginals[f].GetAssignmentValue(assignment_1), 1.0e-7, 0.0);
goto outer_continue;
}
}
}
NUnit.Framework.Assert.AreEqual(result.jointMarginals[f].GetAssignmentValue(assignment_1), 1.0e-3, bruteForceJointMarginal.GetAssignmentValue(bruteForceMarginalAssignment) / sum);
}
outer_break :;
}
marginals_break :;
}
else
{
foreach (double[] marginal in marginals)
{
foreach (double d in marginal)
{
NUnit.Framework.Assert.AreEqual(d, 3.0e-2, 1.0 / marginal.Length);
}
}
}
}
/// <summary>
/// This will calculate marginals, but skip the stuff that is created for gradient descent: joint marginals and
/// partition functions.
/// </summary>
/// <remarks>
/// This will calculate marginals, but skip the stuff that is created for gradient descent: joint marginals and
/// partition functions. This makes it much faster. It is thus appropriate for gameplayer style work, where many
/// samples need to be drawn with the same marginals.
/// </remarks>
/// <returns>an array, indexed first by variable, then by variable assignment, of global probability</returns>
public virtual double[][] CalculateMarginalsJustSingletons()
{
CliqueTree.MarginalResult result = MessagePassing(CliqueTree.MarginalizationMethod.Sum, false);
return(result.marginals);
}
