“ValueError: not enough values to unpack (expected 3, got 2)” in the fpr, tpr calculation on sklearn ROC example

Question

My code to plot the ROC curve,

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true = y_true
pred = preds[:,0]
fpr = dict()
tpr = dict()
roc_auc = dict()
for i in range(2):
    fpr[i], tpr[i], _ =