Implement Inductive training

[ferzcam]

Hi @azzatha, I checked the commit. I think the test_dl2vec file is not run since it does not inherit from unittest.TestCase.

[ferzcam]

Hi, @azzatha, I added the model.add_axioms method. It does several things:

• Adds the axioms into the training ontology of the dataset in the model.
• The entities are ordered alphabetically, Therefore the method also reindexes the dataset classes, relations and individuals
• Reindexes the embeddings of classes, relations and individuals in the current model and for the new entities, random embeddings are assigned. I tested this method with EmbeddingELModels. Testing with GraphModel is missing.

[ferzcam]

Method add_axioms works now for Graph Models with Random Walks. Next step: Implement for Graph Models with KGE.

[ferzcam]

Next Step: Syntatic Models