A suggestion about palette.

[jbwang1997]

When I read the implementation of the palette function, I find a personal dataset with CLASSES defined but PALETTE being None will skip generating a random palette because the get_classes_and_palette returns at

mmsegmentation/mmseg/datasets/custom.py

Lines 308 to 311 in 520ec8e

	if classes is None:
	self.custom_classes = False
	return self.CLASSES, self.PALETTE

The get_palette_for_custom_classes which containing random palette generation will not execute.

As a result, a random palette will be generated in each iteration of testing at

mmsegmentation/mmseg/models/segmentors/base.py

Lines 246 to 252 in 520ec8e

	if palette is None:
	if self.PALETTE is None:
	palette = np.random.randint(
	0, 255, size=(len(self.CLASSES), 3))
	else:
	palette = self.PALETTE
	palette = np.array(palette)

The colors of classes are different in each iteration.

[Lsz-20]

maybe the same question~
when I test and visual my dataset,the picture has been paint in random color,and I have checked the categories which load from checkpoints it seems work well

[MengzhangLI]

#1152