PVRCNN implemented differently?

[adv010]

Hi,

Thanks for the great work!
I'm working on comparing this with 3dioumatch, one of the baselines used. I have a doubt on sup_models/pvrcnn.yaml
The features_source used by 3dioumatch's pv_rcnn_ssl.yaml is as follows :
FEATURES_SOURCE: ['bev', 'x_conv1', 'x_conv2', 'x_conv3', 'x_conv4', 'raw_points']

Whereas, the features_source in config files here is :
FEATURES_SOURCE: ['bev', 'x_conv3', 'x_conv4', 'raw_points']

What's the reason behind x_conv1 and x_conv2 not being used?