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How to create Subgraphs from SPARQL

A. Firstly, you need to construct Freebase Database before querying via SparQL

  1. Download virtuoso-opensource -> Extract and put the folder in the ./virtuoso_db
  2. Download and virtuoso_db file -> unzip and put the folder in the ./virtuoso_db/virtuoso_db

Read more in this link

B. After finishing the preparation

It requires a terminal multiplexer, might use vim or tmux/smux (preferred).

Window1.
  1. Change the working dir: cd ./virtuoso_db
  2. python3 virtuoso.py start 3001 -d virtuoso_db
    To stop: python3 virtuoso.py stop 3001
Window2.

Obtain a raw-subgraph via SPARQL and CONSTRUCT query and
subgraph from the raw-subgraph by skipping unnamed entities:h,r1,*,*,r2,t ->h,r1/r2,t

  • Handle CWQ: python ./preprocess_data/cwq_graph.py
  • Handle GrailQA: python ./preprocess_data/grailqa_graph.py