Added some student behavior exploration and a new digraph #20
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The original digraph takes all chosen video as nodes, however there are nodes with all scores = -1, which usually means that the video is in the student's pending list and is not watched yet.
Therefore I added a new digraph which removes these videos, and the out degree / in degree ratios have some small changes, some videos have their ratio ranking changed significantly. The videos with low retention rates also have some little changes.