Update seg_to_regions.py

[mansourhas]

fix error message isin() received an invalid combination of arguments - got (Tensor, tuple),

[mansourhas]

this issue happens when I'm using CPU, but now, I'm running from a different environment and got a warning..

UserWarning: To copy construct from a tensor, it is recommended to use sourceTensor.clone().detach() or sourceTensor.clone().detach().requires_grad_(True), rather than torch.tensor(sourceTensor). region_output[:, region_id] |= torch.isin(segmentation[:, self.channel_in_seg], torch.tensor(region_labels).to(segmentation.dtype))

which might suggest the issue that the region_labels is a tuble only happens when using CPU?