Updates to IMDB-based graph-NSL tutorial.
Updates to IMDB-based graph-NSL tutorial.

- use 2 neighbors for graph regularization (demonstrates use of > 1 nbr)
- increase # training epochs from 4 to 10 (reduces variance and instability)
- recompute accuracy values for base and graph-regularized model for various supervision ratio values for both the Bi-LSTM and feed-forward NN architectures.

PiperOrigin-RevId: 266485487

tensorflow/neural-structured-learning,tensorflow/neural-structured-learning,tensorflow/neural-structured-learning