Music is practically his sole hobby. Dimon, who’s taking guitar lessons, surprised his aides by practicing chords on a recent flight to China. At home he relishes lying on the couch in his library in a sort of trance, with the stereo blasting a mélange of schmaltzy tunes that includes Sinatra’s “My Way,” “The Impossible Dream,” “New York, New York,” “What a Wonderful World,” and Ray Charles’s “America the Beautiful.” He throws in “Ave Maria” for high art. (The family is so concerned about the blaring Americana that at the Park Avenue apartment they’re renovating in Manhattan the interior walls are being lined with lead soundproofing.) Of course, you might call cost cutting a hobby too. At home, spying a not totally empty bottle of ketchup in the trash ignites an explosion. At one point Dimon was appalled to see that his daughters were using bushels of towels–so he imposed a strict quota of one a week. He’s so frugal that, to the shock of family and friends, he continued to wear T-shirts with the Citigroup (C) logo long after Citi had fired him.
The constraint: your problem must fit vectorized operations. Element-wise math, matrix algebra, reductions, conditionals (np.where computes both branches and masks the result -- redundant work, but still faster than a Python loop on large arrays) -- NumPy handles all of these. What it can't help with: sequential dependencies where each step feeds the next, recursive structures, and small arrays where NumPy's per-call overhead costs more than the computation itself.
。关于这个话题，吃瓜提供了深入分析
《话剧九人·民国知识分子系列五部曲》
Participants receive daily proton beam therapy, Monday to Friday, for five weeks at either UCLH or The Christie NHS Foundation Trust in Manchester.