Tanh

     Operand<TFloat32> input = tf.constant(new float[]
                                        {-3.0f,-1.0f, 0.0f, 1.0f, 3.0f});
     Tanh<TFloat32> tanh = new Tanh<>(tf);
     Operand<TFloat32> result = tanh.call(input);
     // result = [-0.9950547f, -0.7615942f,  0.f,  0.7615942f,  0.9950547f]