function predictHandler() {
  const cards = ui.getInputCards();
  const features =
      gameToFeaturesAndLabel({player1Hand: cards, player1Win: 1}).xs;
  const output = GLOBAL_MODEL.predict(features.expandDims(0));
  ui.displayPrediction(`${output.dataSync()[0].toFixed(3)}`);
}
Applies the model to the manually entered hand value and updates the UI with
the model's prediction.