6 Appendix

We also need "strides" as input to indicate how many new blocks will be kept in each step. BM25 is a famous TF-IDF-like information retrieval method. Each block is scored based on the common words with query or textual label. However, the semantic relevance are neglected. For example, BM25 fails to find the relevance between label name "sports" with "baseball player". Glove is a group of pretrained word representation.