What is "serialized_example" in "apfm_feature_attention_data_generator.py

[BEAU77]

HI, I have some problems when try to debug the code. In the abstract method _decode(self, serialized_example), it need a parameter "serialized_example" which I don't understand what value should assign to this because in line 53, dataset = dataset.map(self._decode) it doesn't pass any value of serialized_example. Could you please give me some help? Thanks a lot.