code: def format(self, node):
      params = self._default_function_params(node)
      params["activation"] = node.get_attr("activation").lower()
      params["config"] = "{}_config{}".format(
          node.get_attr("activation"), node.index
      )
  
      return self.template.format(**params)
  
imports: from hls4ml.backends.backend import get_backend
  from hls4ml.backends.template import FunctionCallTemplate, LayerConfigTemplate
  from hls4ml.model.layers import Activation, BatchNormalization, Dense, HardActivation, ParametrizedActivation, PReLU, Softmax
label_desc: Use image node_id 2 for calling the ActivationFunctionTemplate obj's underlying member method code with example usage: obj.format(node) and returns: self