Fixed AttributeError in metrics/roc_auc.py.

[RavSS]

SciPy deprecated scipy.integrate.trapz long ago and it had instead
been renamed to scipy.integrate.trapezoid. The ROCAUC() class uses
the former instead of the latter (causing an AttributeError), with
the latter being included from the start of SciPy version 1.6.0 (start
of 2021). This is a small fix: I've added a simple hasattr() check for
compatibility with versions that still have scipy.integrate.trapz and
to use it if it's there over scipy.integrate.trapezoid, but it might be
unnecessary, since those versions are outdated.

https://docs.scipy.org/doc/scipy/release/1.6.0-notes.html#scipy-integrate-improvements

[gbolmier]

Hey @RavSS, my apologies for the slow reply and thank you for the contribution!

I think it would make more sense to only use the new trapezoid function name instead and floor the SciPy dependency to 1.6.0. WDYT?

[RavSS]

I agree. It would make maintenance easier too; however, if the latest version of River still works with SciPy versions before 1.6.0 in other parts, then I think it's nice to keep the backwards compatibility at almost no cost for now.

[e10e3]

I would like to point out that the current version of River already requires SciPy to be in version 1.12 or greater (see the pyproject.toml).

No harm would be done in dropping support for SciPy anterior to 1.6.

[gbolmier]

Edit: Too fast for me @e10e3!

@RavSS I just noticed that our SciPy version is already floored to 1.12.1, no need to support scipy<1.6.0 versions then:

river/pyproject.toml

Line 33 in 51bb834

scipy = "^1.12.1"

Also Python >=3.10 were not supported before 1.6.