text: from abc import ABC, abstractmethod
  
  
  class ActivationFunction(ABC):
  
      def __init__(self):
          self.qr = None
          self.cr = None
          self.qc = None
  
      @abstractmethod
      def get_quantum_circuit(self, n_qubits):
          """
          Returns a quantum circuit for implementing the nonlinear action
          """
          pass
  