TOKYO (AP) — Asian shares retreated in cautious trading Wednesday ahead of an earnings report from Nvidia that is seen as a bellwether for the recent craze for artificial intelligence technology. Japan’s benchmark Nikkei 225 was nearly unchanged at 48,724.17. Hong Kong’s Hang Seng dropped 0.5% to 25,812.54, while the Shanghai Composite slipped just over 1 points to 3,939.29. Australia’s S&P/ASX 200 shed 0.1% to 8,458.40, while South Korea’s Kospi shed 0.5% to 3,934.58. Nvidia was due to report