title: tensorflow TypeError: cannot unpack non-iterable float object
body: <p>I am using tensorflow V2.2 and run into TyepError when I do model.evaluate. Can someone advise what the issues may be? A screenshot of the execution and error message is shown below.
  <a href="https://i.stack.imgur.com/bQXNG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bQXNG.png" alt="enter image description here"></a></p>