title: binary_accuracy in keras Metrices , what's the threshold value to predicted one sample as positive and negative cases
body: <p>What's the threshold value of <code>binary_accuracy</code> in keras Metrices is used to predicted one sample as positive and negative cases? is that threshold value 0.5? how to adjust it? I want to set the threshold value 0.80, if the predicted value is 0.79, then it is considered a negative sample，otherwise，if the predicted value is 0.81, then it is considered a positive sample.</p>