Missing dependency

[dlaprins]

Skorecard relies on the optbinning package, but optbinning is not in the base_packages list of setup.py. It should be.

[timvink]

The idea initially was that you can use skorecard without optbinning also, which is quite a heavy depencency.

Hence this code, which gives a helpful error message:

skorecard/skorecard/bucketers/bucketers.py

Lines 19 to 22 in bf6a89e

	try:
	from optbinning import OptimalBinning
	except ModuleNotFoundError:
	OptimalBinning = NotInstalledError("optbinning")

But now bucketers.py has a lot more bucketers than just OptimalBucketer, so you can't really get around it. So, either we add it as a dependency, or, we separate each bucketer into it's own module (and use the __init__.py file to control the namespace, so we don't breaking any existing imports).

[Dronakurl]

When we still want to be able to use skorecard without the package:
Couldn't we do the following?

• put the OptimalBucketer class in a separate file within the bucketers folder
• adjust bucketers/__init__.py, that it imports OptimalBucketer only if optbinning is installed

So if someone uses import bucketers nothing is broken and from bucketers import OptimalBucketer should still work