### Question:
Tanh implements Function { @Override public Matrix apply(final Matrix m) { return applyi(m.dup()); }  @Override Matrix apply(final Matrix m); @Override Matrix applyi(final Matrix m); @Override Matrix derivative(final Matrix m); @Override Matrix derivativei(final Matrix m);  }### Answer:
@Test public void testTanhApply() { final Matrix output = FunctionFactory.getSingleInstance("tanh").apply(input); assertTrue(expectedOutput.compare(output, TOLERANCE)); }