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PG
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The PG scenarios are collected by running simulation and record the episodes in MetaDrive simulator.
The name PG refers to Procedural Generation, which is a technique used to generate maps.
When a map is determined, the vehicles and objects will be spawned and actuated  according to a hand-crafted rules.

Build PG Database
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If MetaDrive is installed, there is no any further steps required to build the database. Just run the following
command to generate, i.e. 1000 scenarios::

    python -m scenarionet.convert_pg -d /path/to/pg_database --num_scenarios 1000


Known Issues: PG
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N/A