Add support for training on a collection of objects

[markusweimer]

Right now, the LearningPipeline can only learn from data consumed via the TextLoader or any other Loader component. For many scenarios, it would be nice to allow for the consumption of collections of objects for training.

[markusweimer]

I can see two possible APIs for this:

var dataList = ...; // A collection of objects serving as training data.

// Variant 1: Make additional pipeline components
var p = new LearningPipeline();
p.Add(new CollectionLoader(dataList));
...
var m = p.Train();

// Variant 2: Data as parameter to .Train:
var p = new LearningPipeline();
...
var m = p.Train(dataList);

Variant 1 seems more natural in our current APIs to me.

[markusweimer]

Closed, as it is a duplicate of #10.