It’s hard to describe this past week’s initial public offering of Cerebras Systems as anything but a resounding success, a reflection of the company’s artificial-intelligence chip technology, and the fortuitous timing smack in the middle of a fierce semiconductor rally. On May 4, Cerebras announced an expected price range with a midpoint of $120. A week later it upped the midpoint to $155. Two days after that, Cerebras priced its IPO at $185 a share.