where is example_helpers?

[Firestar-Reimu]

In https://pybaselines.readthedocs.io/en/latest/generated/examples/whittaker/plot_lam_vs_data_size.html you write a line:

# local import with setup code
from example_helpers import make_data, optimize_lam

but I run on my computer says error:

ModuleNotFoundError: No module named 'example_helpers'

and I cannot found example_helpers or example-helpers in pypi or conda