Issue with grading

Dear Team,

I have the following Training and validation loss.

image

However, the grader is telling me that the output is not acceptable

Failed test case: slope of val_loss curve above threshold.
Expected:
0.0005 or lower,
but got:
0.0015098783082531807.

To me this has a similar result than the third picture shown in this plot:

How is the threshold calculated from the grader?

Kind regards and thanks,

Mauricio

Please see this