class_docstr: Basic transformation: 3x3x3 group conv, 3x3x3 group conv
code: def forward(self, x):
      return self.transform(x)
  
imports: import torch.nn
  from .r2plus1_util import r2plus1_unit
label_desc: Use image node_id 3 for calling the BasicTransformation obj's underlying member method code with example usage: obj.forward(x) and returns: self