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graph graph
图 Graph 图形题不一定需要建图 如果需要建图，考虑边是否具有方向 考虑节点到本身是否有边 建图方式 邻接矩阵 Adjacency matrix space: O(|V|^2) search: O(1) 邻接表 Adj
2020-07-21 algorithm
algorithm 算法 graph
dp dp
动态规划 Dynamic Programming 检查能不能拆分成子问题，且是否会被求解多次 四大要素：状态，初始化，状态转移方程，结果 优化空间，规律交错的题目尝试声明两个变量来存（一维DP两种状态） 优化时间主要看内层循环的
2020-07-19 algorithm
algorithm 算法 dynamic programming
combination permutation combination permutation
Combination 如果需要返回的组合长度不一样，则需要在外层调用dfs时加循环 注意去重 time: O(2^n) int[] nums; List<List<Integer>> res = new ArrayLis
2020-07-19 algorithm
algorithm 算法 combination permutation
hands on: 13 preprocess hands on: 13 preprocess
Data APILoad data from disk. dataset = tf.data.Dataset.from_tensor_slices((df.values, target.values)) Just use the belo
2020-07-19 Deep Learning
DL
hands on: 04 loss hands on: 04 loss
Linear RegressionThe normal equation. $w = (X^TX)^{-1}X^Ty$ from sklearn.linear_model import LinearRegression lin_reg
2020-07-16 Deep Learning
DL
hands on: 02 e2e ml hands on: 02 e2e ml
A piece of info fed to a ML system is called a signal. We want a high signal-to-noise ratio. A sequence of data process
2020-07-16 Deep Learning
DL ML
hands on: 17 autoencoder hands on: 17 autoencoder
Performing PCA with an Undercomplete Linear AutoencoderThe following code builds a simple linear autoencoder to perform
2020-07-14 Deep Learning
DL
mybatis mybatis
JDBC缺点： 非对象，修改表需要重写api。没用连接池，操作数据库需要频繁的创建和关联链接 修改sql的话需要重编译java，不利于系统维护 使用PreparedStatement预编译对变量进行编号，序号不利于维护 返回结果集需要硬编
2020-07-13 Framework
mybatis
hands on: 07 ensemble hands on: 07 ensemble
A group of predictors is called an enselmble. Voting ClassifiersAggregate the predictions of each classifier and predic
2020-06-23 Deep Learning
DL
shell shell
BasicVariableConvention: all caps for system variables, lower case for user defined variables. echo $BASH echo $BASH_VE
2020-06-20 Programming
shell
github github
Introgit: system for version controlgithub: website to upload your directory .md (markdown file): ## This is the header
2020-06-20 app
app github
string string
字符串 考虑使用HashMap进行计数 掌握substring, indexOf, isLetterOrDigit等常见方法 考虑转换成char[] 比较一定要使用equals 找符合条件子串，考虑滑动窗口法，关键在于找到合法起始点 KMP
2020-06-20 algorithm
algorithm 算法 string
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