Adding single context window

[skojaku]

Update

• Implemented a single window that extends leftward or rightward of a center node. This feature may be useful to embed directed networks. Available only for the pytorch version of the residual2vec

How to specify the context window types

The residual2vec_sgd takes a new argument context_window_type that specifies the type of context window. The default is double:

context_window_type = 'left' # {'left', 'right', 'double'} 
rv.residual2vec_sgd(context_window_type=context_window_type)

context_window_type="double" specifies the context window that extends both left and right of a focal node. context_window_type="left" or ="right" specifies that extends left or right, respectively.