The data is exactly the same as in homework 1 except we add one file 'phones/48_idx_chr.map' which provides the mapping from 48 phoneme to the corresponding index and English character. You may download the file '48_idx_chr.map' directly if you already have the training data in homework 1.
Also, we provide you the posterior gram of both testing and training set after a trained DNN. If you didn't get good result in homework 1, then you may try to train you RNN with this given posterior gram.