code: def forward(self, x):
      return x * self.a + self.b
  
imports: from __future__ import annotations
  from .imports import *
  from .data.all import *
  from .optimizer import *
  from .learner import *
  from .callback.core import *
  from torch.utils.data import TensorDataset
  from torch.utils.data import TensorDataset
label_desc: Use image node_id 2 for calling the RegModel obj's underlying member method code with example usage: obj.forward(x) and returns: unknown