LeetCode 376. Wiggle Subsequence
A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The first difference (if one exists) may be either positive or negative. A sequence ...
The Trips table holds all taxi trips. Each trip has a unique Id, while Client_Id and Driver_Id are both foreign keys to the Users_Id at the Users table. Status is an ENUM type of ...
LeetCode 375. Guess Number Higher or Lower II
We are playing the Guess Game. The game is as follows:
I pick a number from 1 to n. You have to guess which number I picked.
Every time you guess ...
LeetCode 374. Guess Number Higher or Lower
We are playing the Guess Game. The game is as follows:
I pick a number from 1 to n. You have to guess which number I picked.
Every time you guess wrong ...
标准Logistic函数为：
f(x) = 1 / ( 1 + exp(-x) )
其导函数为：
f'(x) = f(x) * ( 1 - f(x) )
下面使用matplotlib绘制逻辑斯蒂函数及其导函数的曲线。
Python代码：
import numpy as np
import matplotlib.pyplot as plt
a = np.linspace(-10, 10, 1000)
b = 1.0 / (1.0 + np.exp(-a ...