TrainTestEvaluator can't accept same collection for train and testing.

[Ivanidzo4ka]

System information
.NET Version (eg., dotnet --info): 0.3.0-preview-26604-1

var pipeline = new LearningPipeline();
var data = new List<IrisData>() {
    new IrisData { SepalLength = 1f, SepalWidth = 1f ,PetalLength=0.3f, PetalWidth=5.1f, Label=1},
    new IrisData { SepalLength = 1f, SepalWidth = 1f ,PetalLength=0.3f, PetalWidth=5.1f, Label=1},
    new IrisData { SepalLength = 1.2f, SepalWidth = 0.5f ,PetalLength=0.3f, PetalWidth=5.1f, Label=0}
};
var collection = CollectionDataSource.Create(data);
pipeline.Add(collection);
pipeline.Add(new ColumnConcatenator(outputColumn: "Features",
    "SepalLength", "SepalWidth", "PetalLength", "PetalWidth"));
pipeline.Add(new StochasticDualCoordinateAscentClassifier());
var tt = new TrainTestEvaluator().TrainTestEvaluate<IrisData, IrisPrediction>(pipeline, collection);

Message: System.InvalidOperationException : Port 'Var_c3b11d6c322a4a65ab0b8a5c7054c94c' is already set

[Ivanidzo4ka]

DRI RESPONSE: This is a thread about old API.
New API doesn't have such problems anymore.