This week was brutal for leading artificial intelligence stocks, with Nvidia Corp. (NASDAQ:NVDA), Palantir Technologies, Inc. (NASDAQ:PLTR), and Advanced Micro Devices, Inc. (NASDAQ:AMD) all suffering their steepest declines in months amid growing market chatter about an "AI bubble."Investors who piled into the sector earlier this year began taking profits as valuations stretched and sentiment shifted toward caution.NVDA stock is dropping. Watch the price action here. PLTR's Earnings BurnPalantir posted its ...