Update adapter.py

[lartpang]

Solve the problem of mismatch in the number of return values in special cases.

[lartpang]

@Jeff-LiangF

[Jeff-LiangF]

@lartpang ,Thanks for creating this merge request. Could you point out when the bug would be trigged so that I can test the bug in my end?

[lartpang]

@Jeff-LiangF

This is what happens when I run the code on my own dataset.

In the original code, the code will go into this if statement when using my dataset:

ov-seg/open_vocab_seg/modeling/clip_adapter/adapter.py

Lines 179 to 180 in 36f49d4

	if len(regions) == 0:
	return None, valid

Then, go to the following code and the return value of self._preprocess_image here is wrong:

ov-seg/open_vocab_seg/modeling/clip_adapter/adapter.py

Lines 126 to 128 in 36f49d4

	(regions, unnorm_regions), region_masks, valid_flag = self._preprocess_image(image, mask, normalize=normalize)
	if regions is None:
	return None, valid_flag

Finally, the return value is also wrong in these code:

ov-seg/open_vocab_seg/ovseg_model.py

Lines 236 to 239 in 36f49d4

	if self.clip_ensemble:
	clip_cls, regions, valid_flag = self.clip_adapter(
	image, class_names, mask_pred, normalize=True
	)

So I changed the form of these return values.

[lartpang]

@Jeff-LiangF

Looking forward to your response.

[vmmm123]

Thanks！met the same problem