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.

Several recent works have investigated jointly training the acoustic model with a masking speech enhancement model BIBREF11, BIBREF12, BIBREF13, but these works did not evaluate their system on speech enhancement metrics. Indeed, our internal experiments show that without access to the clean data, joint training severely harms performance on these metrics. 
 Question: Which frozen acoustic model do they use?
a masking speech enhancement model BIBREF11, BIBREF12, BIBREF13

Our model differs by learning the subword vectors and resulting representation jointly as weighted factorization of a word-context co-occurrence matrix is performed. 
 Question: Which matrix factorization methods do they use?
weighted factorization of a word-context co-occurrence matrix 

This paper experimented with two different models and compared them against each other.  
 Question: what was the baseline?

There is no baseline.

