How to load DB_froge class inside my own driver?

Hello there. I've my own driver called data_driver.php and using this drriver, I want to create some database tables. Whenever I'm going to load db_forge class into my driver there is an error saying:

Invalid driver requested: Data_driver_dbforge

I think the load request treating db_forge as a child driver. So what to do now? Looking forword to your answer.
Thanks in advance.

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