private void CreateMarginalChannel(VariableInformation vi, VariableToChannelInformation vtc, IList <IStatement> stmts)
{
IVariableDeclaration marginalDecl = vi.DeriveIndexedVariable(stmts, context, vi.Name + "_marginal");
vtc.marginalChannel = ChannelInfo.MarginalChannel(vi);
vtc.marginalChannel.decl = marginalDecl;
context.InputAttributes.CopyObjectAttributesTo <InitialiseTo>(vi.declaration, context.OutputAttributes, vtc.marginalChannel.decl);
context.OutputAttributes.Set(vtc.marginalChannel.decl, vtc.marginalChannel);
context.OutputAttributes.Set(vtc.marginalChannel.decl, new DescriptionAttribute("marginal of '" + vi.Name + "'"));
VariableInformation marginalInformation = VariableInformation.GetVariableInformation(context, marginalDecl);
marginalInformation.IsStochastic = true;
}
private void CreateMarginalChannel(IVariableDeclaration ivd, VariableInformation vi, IList <IStatement> stmts)
{
IVariableDeclaration marginalDecl = vi.DeriveIndexedVariable(stmts, context, ivd.Name + "_marginal");
marginalOfVariable[ivd] = marginalDecl;
ChannelInfo marginalChannel = ChannelInfo.MarginalChannel(vi);
marginalChannel.decl = marginalDecl;
context.InputAttributes.CopyObjectAttributesTo <InitialiseTo>(vi.declaration, context.OutputAttributes, marginalChannel.decl);
context.OutputAttributes.Set(marginalChannel.decl, marginalChannel);
context.OutputAttributes.Set(marginalChannel.decl, new DescriptionAttribute("marginal of '" + ivd.Name + "'"));
SetMarginalPrototype(marginalDecl);
}
private void CreateSamplesChannel(VariableInformation vi, VariableToChannelInformation vtci, IList <IStatement> stmts)
{
vtci.samplesChannel = ChannelInfo.MarginalChannel(vi);
vtci.samplesChannel.decl = vi.DeriveIndexedVariable(stmts, context, vi.Name + "_samples");
context.OutputAttributes.Remove <InitialiseTo>(vtci.samplesChannel.decl);
context.OutputAttributes.Set(vtci.samplesChannel.decl, vtci.samplesChannel);
context.OutputAttributes.Set(vtci.samplesChannel.decl, new DescriptionAttribute("samples of '" + vi.Name + "'"));
Type domainType = vi.VariableType.DotNetType;
Type samplesType = typeof(List <>).MakeGenericType(domainType);
IExpression samples_mpe = Builder.NewObject(samplesType);
VariableInformation samples_vi = VariableInformation.GetVariableInformation(context, vtci.samplesChannel.decl);
samples_vi.marginalPrototypeExpression = samples_mpe;
}
private void CreateConditionalsChannel(VariableInformation vi, VariableToChannelInformation vtci, IList <IStatement> stmts)
{
vtci.conditionalsChannel = ChannelInfo.MarginalChannel(vi);
vtci.conditionalsChannel.decl = vi.DeriveIndexedVariable(stmts, context, vi.Name + "_conditionals");
context.OutputAttributes.Remove <InitialiseTo>(vtci.conditionalsChannel.decl);
context.OutputAttributes.Set(vtci.conditionalsChannel.decl, vtci.conditionalsChannel);
context.OutputAttributes.Set(vtci.conditionalsChannel.decl, new DescriptionAttribute("conditionals of '" + vi.Name + "'"));
Type marginalType = MessageTransform.GetDistributionType(vi.varType, vi.InnermostElementType,
vi.marginalPrototypeExpression.GetExpressionType(), true);
Type conditionalsType = typeof(List <>).MakeGenericType(marginalType);
IExpression conditionals_mpe = Builder.NewObject(conditionalsType);
VariableInformation conditionals_vi = VariableInformation.GetVariableInformation(context, vtci.conditionalsChannel.decl);
conditionals_vi.marginalPrototypeExpression = conditionals_mpe;
}
private IVariableDeclaration CreateMarginalChannel(VariableInformation vi, IList <IStatement> stmts)
{
IVariableDeclaration marginalDecl = vi.DeriveIndexedVariable(stmts, context, vi.Name + "_marginal");
ChannelInfo marginalChannel = ChannelInfo.MarginalChannel(vi);
marginalChannel.decl = marginalDecl;
context.InputAttributes.CopyObjectAttributesTo <InitialiseTo>(vi.declaration, context.OutputAttributes, marginalDecl);
context.OutputAttributes.Set(marginalDecl, marginalChannel);
context.OutputAttributes.Set(marginalDecl, new DescriptionAttribute("marginal of '" + vi.Name + "'"));
// The following lines are needed for AddMarginalStatements
VariableInformation marginalInformation = VariableInformation.GetVariableInformation(context, marginalDecl);
marginalInformation.IsStochastic = true;
return(marginalDecl);
}
/// <summary>
/// Converts a variable declaration by creating definition, marginal and uses channel variables.
/// </summary>
protected override IExpression ConvertVariableDeclExpr(IVariableDeclarationExpression ivde)
{
IVariableDeclaration ivd = ivde.Variable;
VariableInformation vi = VariableInformation.GetVariableInformation(context, ivd);
// If the variable is deterministic, return
if (!vi.IsStochastic)
{
ProcessConstant(ivd);
context.OutputAttributes.Set(ivd, new DescriptionAttribute("The constant '" + ivd.Name + "'"));
return(ivde);
}
bool suppressVariableFactor = context.InputAttributes.Has <SuppressVariableFactor>(ivd);
bool isDerived = context.InputAttributes.Has <DerivedVariable>(ivd);
bool isConstant = false;
bool isInferred = context.InputAttributes.Has <IsInferred>(ivd);
int useCount;
ChannelAnalysisTransform.UsageInfo info;
if (!analysis.usageInfo.TryGetValue(ivd, out info))
{
useCount = 0;
}
else
{
useCount = info.NumberOfUsesOld;
}
if (!(algorithm is Algorithms.GibbsSampling) && !isConstant && !suppressVariableFactor && (useCount == 1) && !isInferred && isDerived)
{
// this is optional
suppressVariableFactor = true;
context.InputAttributes.Set(ivd, new SuppressVariableFactor());
}
context.InputAttributes.Remove <LoopContext>(ivd);
context.InputAttributes.Set(ivd, new LoopContext(context));
// Create variable-to-channel information for the variable.
VariableToChannelInformation vtc = new VariableToChannelInformation();
vtc.shareAllUses = (useCount == 1);
Context.InputAttributes.Set(ivd, vtc);
// Ensure the marginal prototype is set.
MarginalPrototype mpa = Context.InputAttributes.Get <MarginalPrototype>(ivd);
try
{
vi.SetMarginalPrototypeFromAttribute(mpa);
}
catch (ArgumentException ex)
{
Error(ex.Message);
}
// Create the definition channel
vtc.defChannel = ChannelInfo.DefChannel(vi);
vtc.defChannel.decl = ivd;
// Always create a variable factor for a stochastic variable
if (!isConstant && !suppressVariableFactor)
{
vi.DefineAllIndexVars(context);
IList <IStatement> stmts = Builder.StmtCollection();
// Create marginal channel
vtc.marginalChannel = ChannelInfo.MarginalChannel(vi);
vtc.marginalChannel.decl = vi.DeriveIndexedVariable(stmts, context, vi.Name + "_marginal");
context.InputAttributes.CopyObjectAttributesTo <InitialiseTo>(vi.declaration, context.OutputAttributes, vtc.marginalChannel.decl);
context.OutputAttributes.Set(vtc.marginalChannel.decl, vtc.marginalChannel);
context.OutputAttributes.Set(vtc.marginalChannel.decl, new DescriptionAttribute("marginal of '" + ivd.Name + "'"));
SetMarginalPrototype(vtc.marginalChannel.decl);
if (algorithm is GibbsSampling && ((GibbsSampling)algorithm).UseSideChannels)
{
Type marginalType = MessageTransform.GetDistributionType(vi.varType, vi.InnermostElementType,
vi.marginalPrototypeExpression.GetExpressionType(), true);
Type domainType = ivd.VariableType.DotNetType;
vtc.samplesChannel = ChannelInfo.MarginalChannel(vi);
vtc.samplesChannel.decl = vi.DeriveIndexedVariable(stmts, context, vi.Name + "_samples");
context.OutputAttributes.Remove <InitialiseTo>(vtc.samplesChannel.decl);
context.OutputAttributes.Set(vtc.samplesChannel.decl, vtc.samplesChannel);
context.OutputAttributes.Set(vtc.samplesChannel.decl, new DescriptionAttribute("samples of '" + ivd.Name + "'"));
Type samplesType = typeof(List <>).MakeGenericType(domainType);
IExpression samples_mpe = Builder.NewObject(samplesType);
VariableInformation samples_vi = VariableInformation.GetVariableInformation(context, vtc.samplesChannel.decl);
samples_vi.marginalPrototypeExpression = samples_mpe;
vtc.conditionalsChannel = ChannelInfo.MarginalChannel(vi);
vtc.conditionalsChannel.decl = vi.DeriveIndexedVariable(stmts, context, vi.Name + "_conditionals");
context.OutputAttributes.Remove <InitialiseTo>(vtc.conditionalsChannel.decl);
context.OutputAttributes.Set(vtc.conditionalsChannel.decl, vtc.conditionalsChannel);
context.OutputAttributes.Set(vtc.conditionalsChannel.decl, new DescriptionAttribute("conditionals of '" + ivd.Name + "'"));
Type conditionalsType = typeof(List <>).MakeGenericType(marginalType);
IExpression conditionals_mpe = Builder.NewObject(conditionalsType);
VariableInformation conditionals_vi = VariableInformation.GetVariableInformation(context, vtc.conditionalsChannel.decl);
conditionals_vi.marginalPrototypeExpression = conditionals_mpe;
}
else
{
vtc.samplesChannel = vtc.marginalChannel;
vtc.conditionalsChannel = vtc.marginalChannel;
}
// Create uses channel
vtc.usageChannel = ChannelInfo.UseChannel(vi);
vtc.usageChannel.decl = vi.DeriveArrayVariable(stmts, context, vi.Name + "_uses", Builder.LiteralExpr(useCount), Builder.VarDecl("_ind", typeof(int)), useLiteralIndices: true);
context.InputAttributes.CopyObjectAttributesTo <InitialiseTo>(vi.declaration, context.OutputAttributes, vtc.usageChannel.decl);
context.OutputAttributes.Set(vtc.usageChannel.decl, vtc.usageChannel);
context.OutputAttributes.Set(vtc.usageChannel.decl, new DescriptionAttribute("uses of '" + ivd.Name + "'"));
SetMarginalPrototype(vtc.usageChannel.decl);
//setAllGroupRoots(context, ivd, false);
context.AddStatementsBeforeCurrent(stmts);
// Append usageDepth indices to def/marginal/use expressions
IExpression defExpr = Builder.VarRefExpr(ivd);
IExpression marginalExpr = Builder.VarRefExpr(vtc.marginalChannel.decl);
IExpression usageExpr = Builder.VarRefExpr(vtc.usageChannel.decl);
IExpression countExpr = Builder.LiteralExpr(useCount);
// Add clone factor tying together all of the channels
IMethodInvokeExpression usesEqualDefExpression;
Type[] genArgs = new Type[] { vi.varType };
if (algorithm is GibbsSampling && ((GibbsSampling)algorithm).UseSideChannels)
{
GibbsSampling gs = (GibbsSampling)algorithm;
IExpression burnInExpr = Builder.LiteralExpr(gs.BurnIn);
IExpression thinExpr = Builder.LiteralExpr(gs.Thin);
IExpression samplesExpr = Builder.VarRefExpr(vtc.samplesChannel.decl);
IExpression conditionalsExpr = Builder.VarRefExpr(vtc.conditionalsChannel.decl);
if (isDerived)
{
Delegate d = new FuncOut3 <PlaceHolder, int, int, int, PlaceHolder, PlaceHolder, PlaceHolder, PlaceHolder[]>(Factor.ReplicateWithMarginalGibbs);
usesEqualDefExpression = Builder.StaticGenericMethod(d, genArgs, defExpr, countExpr, burnInExpr, thinExpr, marginalExpr, samplesExpr, conditionalsExpr);
}
else
{
Delegate d = new FuncOut3 <PlaceHolder, int, int, int, PlaceHolder, PlaceHolder, PlaceHolder, PlaceHolder[]>(Factor.UsesEqualDefGibbs);
usesEqualDefExpression = Builder.StaticGenericMethod(d, genArgs, defExpr, countExpr, burnInExpr, thinExpr, marginalExpr, samplesExpr, conditionalsExpr);
}
}
else
{
Delegate d;
if (isDerived)
{
d = new FuncOut <PlaceHolder, int, PlaceHolder, PlaceHolder[]>(Factor.ReplicateWithMarginal <PlaceHolder>);
}
else
{
d = new FuncOut <PlaceHolder, int, PlaceHolder, PlaceHolder[]>(Factor.UsesEqualDef <PlaceHolder>);
}
usesEqualDefExpression = Builder.StaticGenericMethod(d, genArgs, defExpr, countExpr, marginalExpr);
}
if (isDerived)
{
context.OutputAttributes.Set(usesEqualDefExpression, new DerivedVariable()); // used by Gibbs
}
// Mark this as a pseudo-factor
context.OutputAttributes.Set(usesEqualDefExpression, new IsVariableFactor());
if (useCount == 1)
{
context.OutputAttributes.Set(usesEqualDefExpression, new DivideMessages(false));
}
else
{
context.InputAttributes.CopyObjectAttributesTo <DivideMessages>(ivd, context.OutputAttributes, usesEqualDefExpression);
}
context.InputAttributes.CopyObjectAttributesTo <GivePriorityTo>(ivd, context.OutputAttributes, usesEqualDefExpression);
IAssignExpression assignExpr = Builder.AssignExpr(usageExpr, usesEqualDefExpression);
// Copy attributes across from input to output
Context.InputAttributes.CopyObjectAttributesTo <Algorithm>(ivd, context.OutputAttributes, assignExpr);
context.OutputAttributes.Remove <InitialiseTo>(ivd);
if (vi.ArrayDepth == 0)
{
// Insert the UsesEqualDef statement after the declaration.
// Note the variable will not have been defined yet.
context.AddStatementAfterCurrent(Builder.ExprStatement(assignExpr));
}
else
{
// For an array, the UsesEqualDef statement should be inserted after the array is allocated.
// Store the statement for later use by ConvertArrayCreate.
context.InputAttributes.Remove <LoopContext>(ivd);
context.InputAttributes.Set(ivd, new LoopContext(context));
context.InputAttributes.Remove <Containers>(ivd);
context.InputAttributes.Set(ivd, new Containers(context));
vtc.usesEqualDefsStatements = Builder.StmtCollection();
vtc.usesEqualDefsStatements.Add(Builder.ExprStatement(assignExpr));
}
}
// These must be set after the above or they will be copied to the other channels
context.OutputAttributes.Set(ivd, vtc.defChannel);
context.OutputAttributes.Set(vtc.defChannel.decl, new DescriptionAttribute("definition of '" + ivd.Name + "'"));
return(ivde);
}