Definition: In this task, you will be presented with a context from an academic paper and a question separated with a 
. You have to answer the question based on the context.
Input: More specifically, we observe the impact of: (i) pre-trained word embeddings BIBREF11, BIBREF12, recurrent BIBREF13 and transformer-based sentence encoders BIBREF14 as question representation strategies; (ii) distinct convolutional neural networks used for visual feature extraction BIBREF15, BIBREF16, BIBREF17; and (iii) standard fusion strategies, as well as the importance of two main attention mechanisms BIBREF18, BIBREF19. 
 Question: What type of experiments are performed?
Output:
pre-trained word embeddings BIBREF11, BIBREF12 recurrent BIBREF13 transformer-based sentence encoders BIBREF14 distinct convolutional neural networks standard fusion strategies  two main attention mechanisms BIBREF18, BIBREF19