@Yu Chen: fully implement Dynamic graph construction

[teddylfwu]

• Dynamic graph construction: (Yu Chen) i) Add raw_text_to_init_graph method for all dynamic graph construction classes. ii) Explore other similarity metric learning & graph sparsification techniques, and add graph regularization techniques. (Move to base class) iii) Improve doc_string. iv) Even later
  • Complete test on realistic text datasets.
  • NodeEdgeEmbeddingBasedGraphConstruction.

[hugochan]

Finished:

i) Add raw_text_to_init_graph method to base class. ii) Implement other similarity metric learning & graph sparsification techniques, and add graph regularization techniques. iii) Improve doc_string.

[hugochan]

New: decouple graph metric learning & sparsification