Infer.NET

Infer.NET user guide : The Infer.NET Modelling API

ForEach blocks

When array definitions get complicated, the ForEach(range) block comes to the rescue. Every variable created within a ForEach(range) block is automatically tagged with .ForEach(range). Thus the ForEach block works very similarly to a foreach loop in C# (except it is treated as a single object by the Infer.NET compiler, with corresponding efficiency gains during compilation). For example, if bools and pixel are defined as in Working with arrays and ranges, then:


bools[pixel] = Variable.Bernoulli(0.7).ForEach(pixel) |
               Variable.Bernoulli(0.4).ForEach(pixel);

is equivalent to:


using(Variable.ForEach(pixel)) 
{
  bools[pixel] = Variable.Bernoulli(0.7) | Variable.Bernoulli(0.4);


}

ForEach blocks can also be nested, to define multi-dimensional arrays. So the following definition:


doubles2D[pixel,image] = Variable.GaussianFromMeanAndVariance(0,1).ForEach(pixel,image);

is equivalent to:


using(Variable.ForEach(pixel))
{

  using (Variable.ForEach(image))
  {
    doubles2D[pixel, image] = Variable.GaussianFromMeanAndVariance(0,1);
  }

}

and also equivalent to:


using (Variable.ForEach(pixel))
{

  doubles2D[pixel, image] = Variable.GaussianFromMeanAndVariance(0,1).ForEach(image);
}

Last modified at 11/24/2008 3:37 PM by John Guiver