我们在使用 PostgreSQL 的时候经常会遇到有关锁的信息。那么如何判断是否有死锁或者锁等待呢? WITH lock_pid AS ( SELECT DISTINCT pid FROM pg_locks WHERE pid <> pg_backend_pid() )
SELECT psa.* FROM pg_stat_activity psa INNER JOIN lock_pid lp ON …
重修设计模式-行为型-命令模式 The command pattern encapsulates a request as an object, thereby letting us parameterize other objects with different requests, queue or log requests, and support undoable operations. 命令模式将请求(命令)封…
论文链接:Learning nonlinear operators via DeepONet based on the universal approximation theorem of operators | Nature Machine Intelligence 原文部分重点提取
DeepONets 会产生小的泛化误差 隐式类型算子还可以描述我们对其形式没有任何数学知识的系统 De…
import cv2
cap cv2.VideoCapture(0)
if not cap.isOpened():print("摄像头没有加载成功")exit()while True:ret,frame cap.read()if not ret:print("没有接收帧")breakcv2.imshow("frame",frame)if cv2.waitKey(1) ord(q):break
cap.release(…
云计算的服务模型
云计算模型中有 IaaS(Infrastructure as a Service,基础架构即服务)、PaaS(Platformas a Service,平台即服务)、SaaS(Software as a Service,软件即服务ÿ…