This code has been tested on Goby.com data set. The steps to execute this code are :-

1. Create a new schema.
2. Next step is to include files category_start.sql and entity.sql in this new schema created.
3. Execute the code for a particular category by using :- select start_this(category_id);
4. You can view the output of this code in the table "output" which has the columns category_id, total entities, false positives, false negatives.