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原创《机器学习实战》读后备忘

最近在看《机器学习实战》第9章，CART算法用于回归，在python2.7版本下跑，发现代码报错，所以勘误了下。下面只是回归树的部分勘误代码：，class treeNode(): def __init__(self, feat, val, right, left): featureToSplitOn = feat#切分的特征 valueOfSplit =

2016-10-28 17:40:08 998

原创 r语言备忘

1.rnorm是正态分布函数，如何验证? 答：可以通过直方图来看 x=rnorm(1000) hist(x)

2016-09-14 14:03:17 445

原创 python备忘

1.元组不能修改，列表可以修改，因为字典的键不能修改，所以只能用元组 2.将一个数扩展成列表 >>> [1]*5 [1, 1, 1, 1, 1] 3.对列表排序，sort原地排序，sorted在副本排序 >>> x=[3,4,6,1,9,8,0] >>> x.sort() >>> x [0, 1, 3, 4, 6, 8, 9] >>> sorted(x) [0, 1, 3,

2016-08-19 14:36:17 580

原创 R语言使用备忘

1.下载包时突然发现： > install.packages("Rserve") 警告: 无法在貯藏處https://cran.cnr.berkeley.edu/bin/windows/contrib/3.1中读写索引警告信息： package ‘Rserve’ is not available (as a binary package for R version 3.1.3)

2016-08-17 14:44:09 2734

原创查找源码jar包出现指定文字的小程序

package finder; import java.io.IOException; import java.io.InputStream; import java.util.Enumeration; import java.util.List; import java.util.jar.JarEntry; import java.util.jar.JarFile; import java.u

2016-02-25 15:06:47 444

原创 nginx配置备忘

server{ listen 80; #server_name 192.168.50.98; server_name test.xxx.com.cn; location = / {#根目录跳转 #proxy_set_header Host "192.168.50.98";

2016-02-16 16:22:20 359

原创《MongoDB in action》2012版翻译 1.1

A database for the modern web If you’ve built web applications in recent years, you’ve probably used a relational database as the primary data store, and it probably performed acceptably. Most develo

2016-01-18 15:10:29 435

原创尝试《Java Network Programming 4ed》Chapter 8 Using Sockets翻译

Data is transmitted across the Internet in packets of finite size called datagrams. Each datagram contains a header and a payload. The header contains the address and port to which the packet is going

2016-01-18 09:35:10 1483

原创尝试《Java Network Programming 4ed》Chapter 11 Readiness Selection翻译

Readiness Selection For network programming, the second part of the new I/O APIs is readiness selection, the ability to choose a socket that will not block when read or written. This is primarily of

2016-01-15 14:37:25 577

原创尝试《Java Network Programming 4ed》Chapter 11 Channels翻译

Channels Channels move blocks of data into and out of buffers to and from various I/O sources such as files, sockets, datagrams, and so forth. The channel class hierarchy is rather convoluted, with m

2016-01-13 10:52:56 927

原创尝试《Java Network Programming 4ed》的部分翻译

position The next location in the buffer that will be read from or written to. This starts counting at 0 and has a maximum value equal to the size of the buffer. It can be set or gotten with

2016-01-08 11:51:09 788

原创 solr备忘

删除索引的Collection API(更多参见https://cwiki.apache.org/confluence/display/solr/Collections+API) http://IP:PORT/solr/admin/collections?action=DELETEREPLICA&collection=IndexName&shard=shardX&replica=core_nod

2016-01-04 15:17:53 803

原创工作遇到的问题备忘

搜索系统出现过的一些问题 1. 未解决 http://192.168.239.128:8985/solr/pconline_cms/select?q.op=AND&useSynonym=true&fq=%2Bfilter%3A1+%2Bis_wap%3A0+AND+NOT+a_type%3Ay+AND+NOT+pathIds%3A000095064&facet=true&facet.fie

2015-12-18 17:08:00 541