BaseDataset: self.num_classed

[zhanggj821]

how do i get the self.num_classes in the file of mmaction/datasets/base.py. I got a None type if I directly use 'self.num_classses'

[dreamerlin]

you should set it in config files.

[zhanggj821]

thanks for your reply, but config files do not need to set it normally, i think it may be passed in function "build_from_cfg" but I don't got it.....
I mean if I want to modified the function 'evaluate' in class 'BaseDataset' i.e., the file of mmaction/datasets/base.py and I wanna use
the self.num_classes property, but actually I get a None Type

[dreamerlin]

https://github.com/open-mmlab/mmaction2/blob/master/configs/recognition/tsn/tsn_r101_1x1x5_50e_mmit_rgb.py#L91-L111

[zhanggj821]

thank you. i figure out it，I mistakenly thought it would calculate automatically