RAID基本原理 RAID级别 读性能 写性能 空间利用率 最大能容忍的坏盘数 RAID0 单块盘的N倍 单块盘的N倍 100% 0 RAID1 单块盘的N倍 最慢磁盘的性能 1/N N-1 RAID2 不到单块

本文转自w大 《第一阶段》筑基 如果你不知道什么是for/while lopp、不知道什么是list，建议你先上这门公开课： UDacity CS101：Intr

From Statement of Financial Position Statement of Financial Position, also known as the Balance Sheet, presents the financial position of an entity at a given date. It is comprised of the following three elements: Assets: Something a business owns or controls (e.g. cash, inventory, plant and machinery, etc) Liabilities: Something a business owes to someone (e.g. creditors, bank loans, etc) Equity: What the business owes to its owners. This represents the amount of capital that remains in the business after its assets are used to pay off its outstanding liabilities.

machine learning word2vex represent word as low dimensional, dense vectors compute the statistics of how ofen some word cooccurs with its neighbor words in a large text corpus. 将数量变成小的dense的vector predictive models directly try to predict a word from its neighbours in terms of learned small, dense embedding Word2Vec https://web.archive.org/web/20160311161826/http://cs224d.stanford.edu/lecture_notes/LectureNotes1.pdf Parameter Server https://www.cs.cmu.edu/~muli/file/parameter_server_osdi14.pdf

While propositional logic assumes the world contains facts, first-order logic assumes the world contains objects, relations, functions, like natural language. Syntax Constants: Poly, 2, refer to objects Predicates: brother, larger than, refer to relations functions: sqrt, refer to functional relations variables: x, y connectives: ^ $\Rightarrow$ equality: = quantifiers: $\exists$, $\forall$ Sentences atomic sentence = predicate(term1, …, termN) or term1 = term2. where term = function(term1, …, termN) or constant or variable complex sentences are made from atomic sentences using connectives Universal quantification $\forall $ Typically, $\Rightarrow$ is the main connective with $\forall$, avoid $\wedge$.