(Bloomberg) -- Artificial-intelligence bulls are increasingly gravitating toward an ETF that amps up bets on Nvidia Corp. as trading volumes and inflows hit all-time highs.Most Read from BloombergOne of the Most Infamous Trades on Wall Street Is Roaring BackChina Has Never Canceled This Many Shipments of US WheatTech CEOs Are Addicted to Taking Needless RisksChinese Stocks Gain 20% From Lows, Fueling Market Bottom CallsAfter notching a record $252 million in fresh capital last week, the GraniteS