As the world's top central bankers gather in Wyoming this week, their relief about a stronger global economy will be tempered by a growing unease that inflation remains inexplicably low.

Federal Reserve Chairwoman Janet Yellen and European Central Bank President Mario Draghi will be among the officials addressing this year's installment of the annual conference hosted by the Kansas City Fed.

The summit, held at a Jackson Hole mountain retreat, comes as central banks in advanced economies creep toward the policy exit after years of unprecedented easing, even with outlooks clouded by stubbornly tepid inflation.