Simple feature fixes

[JKL98ISR]

closes #1004

docs have now example per class and per all. added min pps to init + test
also fixed not showing negative difference in the condition (if train < test)

[nirhutnik]

But... you just reverted the doc to use the per_class=False. But we do want to show the per_class=True feature. We actually want to show both.

[JKL98ISR]

it has both

[JKL98ISR]

mnist is per class

[nirhutnik]

👍

[nirhutnik]

You didn't add min_pps_to_show to the check's parameters...
To this one or to single feature

[JKL98ISR]

i added to simple feature, should i add to single too?

[nirhutnik]

Yes, I think so. Also missed that it was added to the check, sorry

[JKL98ISR]

added

[JKL98ISR]

coco after bias

mnist after bias

coco no bias:

[nirhutnik]

1. MNIST after bias - there's rarely any difference... Did you insert bias both into train and test? It should be inserted differently, if at all (can only insert to train, but good to insert a bit into test)

2. COCO - because there is already a bit of bias, I would insert only into train. Again, the differences here as well are not significant. We want to have an example with a real difference.