Python分分钟实现图书管理系统(含代码)废话不多说,直接上代码。import sys#打印书库中的所有书的函数 def book_detail(books):for book_name,book_info in books.items():if book_info is not None:print('bookName:{} ISBN:{} title:{} ...
代码import numpy as np def DCG(A,test_set):#-计算 DCG-#dcg=0 for i in range(len(A)):#给r_i赋值,若r_i在测试集中则为1,否则为0 r_i=0 if A[i]in test_set:r_i=1 dcg+(2*r_i-1)/np.log2((i+1)+1)#(i+1)是因为下标从0开始 return dcg ...