In the stage 1 starter notebook there are x2 comments:
When you open the sample notebook there’s a smooth curve from [0, 5].
Assumption: replacing stage1_sample_output → stage1_sample_submission
The plot evaluates over the domain [0, 5.5] and is multi-valued at X > 5. Which is fine; makes it more interesting. I suppose the question is;
What is the intended domain of the training data [0, 5] or [0, 5.5]?