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    Hello,

    I am new to Infer.NET. This is a factor I created as according to add new factor . But it does not work .

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MicrosoftResearch.Infer.Models;
using MicrosoftResearch.Infer.Maths;
using MicrosoftResearch.Infer;
using MicrosoftResearch.Infer.Distributions;
using MicrosoftResearch.Infer.Factors;
[assembly: MicrosoftResearch.Infer.Factors.HasMessageFunctions]
    public static class MyFactor
    {
       
        public static Vector SumTwoVector(Vector a, Vector b)
        {
            return a+b;
        }
        [FactorMethod(typeof(MyFactor), "SumTwoVector",typeof(Variable<Vector>),typeof(Variable<Vector>))]
        public static class SumTwoVectorOp
        {
               
            public static VectorGaussian SumAverageLogarithm(VectorGaussian vector1,VectorGaussian vector2) 
            {
                Vector v=null;
                PositiveDefiniteMatrix m=null;
                vector1.GetMeanAndVariance(v,m);
                Vector v2=null;
                PositiveDefiniteMatrix m2=null;
                vector2.GetMeanAndVariance(v2,m2);
                return VectorGaussian.FromMeanAndVariance(v+v2,m+m2);

           }
           public static VectorGaussian TwoP1AverageLogarithm(VectorGaussian sum, VectorGaussian vector1)
             {
                 Vector v=null;
                PositiveDefiniteMatrix m=null;
                sum.GetMeanAndVariance(v,m);

                Vector v2=null;
                PositiveDefiniteMatrix m2=null;
                vector1.GetMeanAndVariance(v2,m2);
                return VectorGaussian.FromMeanAndVariance(v-v2,m);
             }
            public static VectorGaussian TwoP2AverageLogarithm(VectorGaussian sum, VectorGaussian vector2)
             {

                Vector v=null;
                PositiveDefiniteMatrix m=null;
                sum.GetMeanAndVariance(v,m);

                Vector v2=null;
                PositiveDefiniteMatrix m2=null;
                vector2.GetMeanAndVariance(v2,m2);
                return VectorGaussian.FromMeanAndVariance(v-v2,m);
             }
        }
    }
     

    Is there any special notations should be added to factor method declaration?

    I did not see which connects the method and the operator....

    In the method declaration, it only accepts ordinary types, right?

    Friday, July 13, 2012 2:30 PM

Answers

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    (a) I suggest adding parameter names to your Factor method:

    [ParameterNames("Sum", "A", "B")]
public static Vector SumTwoVector(Vector a, Vector b)
{
    return a + b;
}

    (b) Your operator class should have the following attribute (i.e. Vector, not Variable<Vector>)

     [FactorMethod(typeof(MyFactor), "SumTwoVector",typeof(Vector),typeof(Vector))]

    (c) The operator method names have to reflect the names of the variables ("Sum" "A", "B" given the ParameterNames attribute above. So:

    SumAverageLogarithm, AAverageLogarithm, and BAverageLogarithm.

    John



    Tuesday, July 17, 2012 1:44 PM
    Owner

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  • Question
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    (a) I suggest adding parameter names to your Factor method:

    [ParameterNames("Sum", "A", "B")]
public static Vector SumTwoVector(Vector a, Vector b)
{
    return a + b;
}

    (b) Your operator class should have the following attribute (i.e. Vector, not Variable<Vector>)

     [FactorMethod(typeof(MyFactor), "SumTwoVector",typeof(Vector),typeof(Vector))]

    (c) The operator method names have to reflect the names of the variables ("Sum" "A", "B" given the ParameterNames attribute above. So:

    SumAverageLogarithm, AAverageLogarithm, and BAverageLogarithm.

    John



    Tuesday, July 17, 2012 1:44 PM
    Owner
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    John,

    Thanks for your reply. I modified the codes as you suggested. But when I try to call this method, It alert a compiler error. As the method requires a Vector not a Variable<Vector> .

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MicrosoftResearch.Infer.Models;
using MicrosoftResearch.Infer.Factors;
using MicrosoftResearch.Infer;
using MicrosoftResearch.Infer.Distributions;
using MicrosoftResearch.Infer.Maths;

public class Class1
{
    class program
    {
        static void Main()
        {

            Vector[] pros = new Vector[] { Vector.FromArray(0.3, 0.3,0.4 ) /* */, Vector.FromArray(0.3,0.3,0.4 ) /* */, 
                    Vector.FromArray(0.1, 0.4,0.5 ),Vector.FromArray(0.1,0.5,0.4 )};
            var Pros = pros.Select(v => VectorGaussian.PointMass(v)).ToArray();

            VariableArray<Vector> contributionMatrix;
            Range K = new Range(4);
            Range D = new Range(3);
            Variable<PositiveDefiniteMatrix> MatrixC;
            MatrixC = PositiveDefiniteMatrix.Identity(3);
            VariableArray<VectorGaussian> contributionPrior;
            contributionPrior = Variable.Array<VectorGaussian>(K).Named("contributionprior");

            contributionMatrix = Variable.Array<Vector>(K).Named("Emission");
            contributionMatrix[K] = Variable<Vector>.Random<VectorGaussian>(contributionPrior[K]);
            contributionMatrix.SetValueRange(D);


            contributionPrior.ObservedValue = Pros;

            InferenceEngine ei = new InferenceEngine(new VariationalMessagePassing());
            ei.ShowFactorGraph = true;

            Variable<Vector> r1 = Variable.VectorGaussianFromMeanAndPrecision(contributionMatrix[0], MatrixC);
            Variable<Vector> r2 = Variable.VectorGaussianFromMeanAndPrecision(contributionMatrix[1], MatrixC);
            
            Variable<Vector> r = MyFactor.SumTwoVector(r1,r2);

            Console.WriteLine(ei.Infer(r1));

            Console.Read();
        }
    }

}



    Thursday, July 19, 2012 9:12 PM
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    You need to use the Factor method on Variable<Vector> to incorporate your factor into your model as described in the first paragraph of http://research.microsoft.com/infernet/docs/How%20to%20add%20a%20new%20factor%20and%20message%20operators.aspx - see link to http://research.microsoft.com/infernet/docs/applying%20functions%20and%20operators%20to%20variables.aspx

    Variable<Vector>.Factor<Vector, Vector>(MyFactor.SumTwoVector, r1, r2)


    Friday, July 20, 2012 7:52 AM
    Owner