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Now older data updating will be executed sequentially
by follwing below steps for each olders.

1. Wait 2 secs.
2. Get row data in queue regarding older1.
3. Dequeue all data and request prediction if queue length exceeds 50. (else return 1.)
4. Update older1's data
5. Loop each other older 2.~4. and go 1.

This branch also update variable length data request for action prediction