logistic回归为啥叫logistic
【logistic回归为啥叫logistic】“logistic回归”这个名字听起来有点奇怪,为什么不是“逻辑回归”或者“逻辑模型”呢?其实,“logistic”这个词来源于一个数学函数——logistic function(逻辑函数)。它在统计学和机器学习中被广泛用于分类问题,尤其是二分类问题。下面我们就来详细解释一下“logistic回归”为何被称为“logistic”。
【leave的用法和短语】“Leave” 是英语中一个非常常见的动词,具有多种含义和用法。它既可以表示“离开”、“留下”等基本意思,也可以用于构成各种固定搭配或短语,表达不同的语义。以下是对 “leave” 的主要用法和常见短语的总结。
一、基本用法
| 用法 | 含义 | 例句 |
| leave + 地点 | 离开某地 | I will leave for Beijing tomorrow. |
| leave + 时间 | 在某个时间离开 | She left at 8 o'clock. |
| leave + 某人/某物 | 留下某人或某物 | He left his bag on the bus. |
| leave + 某人/某事 | 让某人/某事处于某种状态 | The teacher left the door open. |
| leave + 自己 | 留下自己(不被打扰) | Please leave me alone. |
二、常见短语与搭配
| 短语 | 含义 | 例句 |
| leave behind | 留下(东西或人) | They left their keys behind. |
| leave off | 停止(做某事) | He left off smoking last year. |
| leave out | 忽略;不包括;遗漏 | Don't leave me out of the plan. |
| leave alone | 不打扰;独自处理 | Let the child be, don't leave him alone. |
| leave it to someone | 把某事交给某人处理 | I'll leave it to you. |
| leave for | 去往某地 | We are leaving for Paris next week. |
| leave a message | 留言 | Can I leave a message for her? |
| leave one's heart | 留下心(情感上的) | She left her heart in that city. |
| leave something in the past | 把过去的事情放下 | It's time to leave the past behind. |
三、特殊用法
- leave + 宾语 + 动词不定式:表示让某人做某事
- I left him to finish the work.
- leave + 宾语 + 过去分词:表示让某物被处理
- She left the house cleaned.
四、注意事项
1. “Leave” 和 “go away” 都有“离开”的意思,但 “leave” 更强调动作本身,而 “go away” 更侧重于从某地离开。
2. “Leave” 可以用于被动语态,如 “The book was left on the table.”
3. “Leave” 有时也用于比喻意义,如 “He left the company due to personal reasons.”
通过以上总结可以看出,“leave” 虽然简单,但在实际使用中有着丰富的含义和多样的搭配方式。掌握这些用法和短语,有助于更准确地理解和运用这一动词。
leave的用法和短语