Feedback loop

  • Fix
  • Model 16

Difficulty 4 of 5

A ranker picks the items in each home feed and retrains every night on the clicks it gets. Over 30 days, feed quality falls a little each day. Keep the average quality above 0.74 for the month. You can make 2 edits.

Day 24, 10:00. Home feed quality is down 21 percent since launch, and fewer items get shown each week. Graph: daily quality.

Play level

HTTP/2gRPCMobile users50 req/sAPI server1 vCPU · 2 GBModel (CPU)2 vCPU · 4 GB
HTTP/2gRPCMobile users50 req/sAPI server1 vCPU · 2 GBModel (CPU)2 vCPU · 4 GB
The board at the start of the level
One change feed keeps serving in stepTap or press Space to change the write paths

Two write paths · 4 of 16 served features differ from training

Goals and limits

Quality
at least 0.74
Error rate
under 0.1%
Monthly cost
under 100 USD/mo
Edit limit
2
Traffic
50 req/s

Concepts

How players did

Player results load from the server.

All levels