bug in collect_indoor3d_data.py

[PeterPyPan]

There is a bug in the data collection script (collect_indoor3d_data.py) for windows systems, resulting in wrongly placed, npy files.

Line 18 does not split the path into all its components as the separator on windows is \\.
The result of this bug is that the processed npy files end up in the Stanford3dDataset folder, instead of the stanford_indoor3d_ins.sem folder.

>>> elements = anno_path.split('/')
elements = ['C:\\ASIS\\data\\Stanford3dDataset_v1.2_Aligned_Version\\Area_2', 'conferenceRoom_1', 'Annotations']

minimal fix tested on windows:

>>> elements = os.path.normpath(anno_path).split(os.path.sep)
elements = ['C:', 'ASIS', 'data', 'Stanford3dDataset_v1.2_Aligned_Version', 'Area_2', 'conferenceRoom_1', 'Annotations']

[Xinlong Wang]

Hi Peter, thanks for pointing out this.:)