I am trying to write my own custom metric functions in keras and I wanted to start with a test function so I implemented a f1_score function using sklearn, next I will need to customize the calculation of the metrics according to my evaluation metrics and therefore I want to set a breakpoint inside the custom metric function to further investigate some values and make sure that is being calculated as I am expecting and I have tried to simply set a breatpoint inside the function but the program never stops at the breakpoint, however, if I print something inside the function it gets printed after every batch (every time the function is called) which meant the function is being executed as expected. Here is my test callback function

# metrics call backs
def f1_macro(y_true, y_pred):
    y_true_array = np.squeeze(np.asarray(y_true))
    y_pred_array = np.round(np.squeeze(np.asarray(y_pred)))

    f1 = f1_score(y_true_array, y_pred_array, "macro")
    return f1

Here what I have tried with no success


set the run_eagrly flag to true while compile


Does anyone know how can I do that ? Thanks in advance


1 Answer 1


I found the solution, using the built-in breakpoint() function as FLAK-ZOSO mentioned here https://stackoverflow.com/questions/69062229/how-to-set-a-breakpoint-inside-a-custom-metric-function-in-keras?noredirect=1#comment122059117_69062229

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    Sep 5, 2021 at 12:55

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