/// <summary>
/// Gets a final transform to concatenate all numeric columns into a "Features" vector column.
/// Note: May return empty set if Features column already present and is only relevant numeric column.
/// (In other words, if there would be nothing for that concatenate transform to do.)
/// </summary>
private static TransformInference.SuggestedTransform[] GetFinalFeatureConcat(IHostEnvironment env,
IDataView dataSample, int[] excludedColumnIndices, int level, int atomicIdOffset, RoleMappedData dataRoles)
{
var finalArgs = new TransformInference.Arguments
{
EstimatedSampleFraction = 1.0,
ExcludeFeaturesConcatTransforms = false,
ExcludedColumnIndices = excludedColumnIndices
};
var featuresConcatTransforms = TransformInference.InferConcatNumericFeatures(env, dataSample, finalArgs, dataRoles);
for (int i = 0; i < featuresConcatTransforms.Length; i++)
{
featuresConcatTransforms[i].RoutingStructure.Level = level;
featuresConcatTransforms[i].AtomicGroupId += atomicIdOffset;
}
return(featuresConcatTransforms.ToArray());
}
