private static Var <PredictorModel> ProcessClass(IHostEnvironment env, List <EntryPointNode> macroNodes, int k, string label, Arguments input, EntryPointNode node)
{
Contracts.AssertValue(macroNodes);
// Convert label into T,F based on k.
var labelIndicatorArgs = new LabelIndicatorTransform.Options();
labelIndicatorArgs.ClassIndex = k;
labelIndicatorArgs.Columns = new[] { new LabelIndicatorTransform.Column()
{
Name = label, Source = label
} };
var inputBindingMap = new Dictionary <string, List <ParameterBinding> >();
var inputMap = new Dictionary <ParameterBinding, VariableBinding>();
var paramBinding = new SimpleParameterBinding(nameof(labelIndicatorArgs.Data));
inputBindingMap.Add(nameof(labelIndicatorArgs.Data), new List <ParameterBinding>()
{
paramBinding
});
inputMap.Add(paramBinding, node.GetInputVariable(nameof(input.TrainingData)));
var outputMap = new Dictionary <string, string>();
var remappedLabelVar = new Var <IDataView>();
outputMap.Add(nameof(CommonOutputs.TransformOutput.OutputData), remappedLabelVar.VarName);
var labelIndicatorNode = EntryPointNode.Create(env, "Transforms.LabelIndicator", labelIndicatorArgs, node.Context,
inputBindingMap, inputMap, outputMap);
macroNodes.Add(labelIndicatorNode);
// Parse the nodes in input.Nodes into a temporary run context.
var subGraphRunContext = new RunContext(env);
var subGraphNodes = EntryPointNode.ValidateNodes(env, subGraphRunContext, input.Nodes);
// Rename all the variables such that they don't conflict with the ones in the outer run context.
var mapping = new Dictionary <string, string>();
bool foundOutput = false;
Var <PredictorModel> predModelVar = null;
foreach (var entryPointNode in subGraphNodes)
{
// Rename variables in input/output maps, and in subgraph context.
entryPointNode.RenameAllVariables(mapping);
foreach (var kvp in mapping)
{
subGraphRunContext.RenameContextVariable(kvp.Key, kvp.Value);
}
// Grab a hold of output model from this subgraph.
if (entryPointNode.GetOutputVariableName("PredictorModel") is string mvn)
{
predModelVar = new Var <PredictorModel> {
VarName = mvn
};
foundOutput = true;
}
// Connect label remapper output to wherever training data was expected within the input graph.
if (entryPointNode.GetInputVariable(nameof(input.TrainingData)) is VariableBinding vb)
{
vb.Rename(remappedLabelVar.VarName);
}
// Change node to use the main context.
entryPointNode.SetContext(node.Context);
}
// Move the variables from the subcontext to the main context.
node.Context.AddContextVariables(subGraphRunContext);
// Make sure we found the output variable for this model.
if (!foundOutput)
{
throw new Exception("Invalid input graph. Does not output predictor model.");
}
// Add training subgraph to our context.
macroNodes.AddRange(subGraphNodes);
return(predModelVar);
}