Task: Question Answering
Input (English): We first run our experiment on BiLSTM, BiLSTM-CNN, BiLSTM-CRF BiLSTM-CNN-CRF using the hyper-parameters mentioned in Table TABREF30.  
 Question: Which machine learning models do they explore?
Output (English): BiLSTM BiLSTM-CNN BiLSTM-CRF BiLSTM-CNN-CRF