The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all() for computing y_pred from given probabilities

Question

I have given a dataset that contains two columns \'y\' and \'proba\'. \'y\' has two class labels \'0 and 1\' and \'proba\' is the probability. dataset

I have to create a