how to decide the size of representative sample of data, if the dataset consist of 5 features and 153000, knowing that the sample I have to use them in Training, evaluating, and testing the ANN model, the project is for learning purpose not a real project, that's why I want to reduce the number of instances, but I don't want to affect the prediction accuracy if I reduce the data size, and I want to avoid the overfitting and underfitting, that's why I want to know how to determine the size of the data, if I'll have to reduce it from 153000