May I know does the fold_idx is always start at 0? Why the second line need to add +1 for the first one? I know +1 is needed as an incremental of 1 in the fold number during the for loop.
for fold_idx, estimator in enumerate(cv_results[“estimator”]):
print(f"Best parameter found on fold #{fold_idx + 1}")
print(f"{estimator.best_params_}")
