starter code for a2

Add the corresponding (one) line under the [to fill] in def forward() of the class for ffnn.py and rnn.py

Feel free to modify other part of code, they are just for your reference.

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One example on running the code:

FFNN

python ffnn.py --hidden_dim 10 --epochs 1 --train_data ./training.json --val_data ./validation.json

RNN

python rnn.py --hidden_dim 32 --epochs 10 --train_data training.json --val_data validation.json