code: def accuracy(self):
          
          true_pos = self.matrix[0][0]
          false_pos = self.matrix[1][0]
          false_neg = self.matrix[0][1]
          true_neg = self.matrix[1][1]
  
          num = 1.0 * (true_pos + true_neg)
          den = true_pos + true_neg + false_pos + false_neg
  
          return divide(num, den)
docs: Calculates accuracy
  
          :return: Accuracy