I compiled three times. After the first compilation stopped, I waited for about two hours, and then “Ctrl + C” ended the compilation process. I suspected it was MAX_ JOBS’s problem, so I compiled  the second time after “Python3 setup.py clean ”. This time I used MAX_ JOBS = 16, still stop at the same position. So I compiled the third time after “python3 setup.py clean” . This time I suspected that it was a problem with MKLDNN, so I used USE_ MKLDNN = 0, still invalid. This is the whole process. I haven’t changed anything else.