class_docstr: Implementation of various activation function.
code: def forward(self, x):
      return self.f(x)
  
imports: import math
  import torch
  from torch import nn
  from transformers.activations import get_activation
  from ..configuration import AdapterFusionConfig, BnConfig
  from ..context import ForwardContext
label_desc: Use image node_id 2 for calling the Activation_Function_Class obj's underlying member method code with example usage: obj.forward(x) and returns: self