message: Add unit test for K.any
diff: @@ -605,6 +605,22 @@ class TestBackendOps(unittest.TestCase):
  def testAllNegAxis(self, b):
  return b.all(b.variable(m(3, 4, 5)), axis=-1)
  + @compareForwardExact()
  + def testAny(self, b):
  + return b.any(b.variable(m(3, 3)))
  +
  + @compareForwardExact()
  + def testAnyKeepdims(self, b):
  + return b.any(b.variable(m(3, 3)), keepdims=True)
  +
  + @compareForwardExact()
  + def testAnyAxis(self, b):
  + return b.any(b.variable(m(2, 3, 4, 5)), axis=[1, 3])
  +
  + @compareForwardExact()
  + def testAnyNegAxis(self, b):
  + return b.any(b.variable(m(3, 4, 5)), axis=-1)
  +
  @opTest([
  [m(3, 3)],
  [m(3, 3), None, True],
  