centos7下 vowpal_wabbit 8.2.0安装实录及简单测试

本是古典何须时尚 2022-10-16 06:12 84阅读 0赞

# 官网地址： #

> https://github.com/VowpalWabbit/vowpal\_wabbit/wiki/Command-line-arguments

1、基础环境：安装make 、 cmake、boost-devel、help2man：

yum -y install gcc automake autoconf libtool make
    yum install cmake

[升级cmake版本][cmake]  
安装boost-devel:

yum install boost-devel

安装help2man

yum -y install help2man

安装g++:

yum install gcc gcc-c++

其他依赖：

yum -y install gcc  gcc-c++  
    yum install make  
    yum install epel-release -y
    yum install clang -y
    yum -y install libtool -y
    yum install zlib-devel -y
    yum install boost boost-devel boost-doc -y
    yum install redhat-lsb -y

VW 安装:

1、tar -zxvf vowpal_wabbit-8.2.0.tar.gz 
    2、cd vowpal_wabbit-8.2.0/
    3、./autogen.sh
    4、./configure

Input format  
The raw (plain text) input data for VW should have one example per line. Each example should be formatted as follows. Fields are space-delimited.

Label [Tag]|Namespace Features |Namespace Features ... |Namespace Features

如（label:1/0, namespace:lenth/with/author,tag:'1/'2）：  
![在这里插入图片描述][20210527203119853.png]

Namespace=String[:Value]
    Features=(String[:Value] )*
    Label = see below

1.  **Tag** is a string that serves as an identifier for the example. It is  
    reported back when predictions are made. It doesn’t have to be  
    unique. The default value if it is not provided is the empty string.  
    If you provide a tag without a weight you need to disambiguate:  
    either make the tag touch the | (no trailing spaces) or mark it with  
    a leading single-quote '. If you don’t provide a tag, you need to  
    have a space before the |.
2.  **Namespace** is an identifier of a source of information for the  
    example optionally followed by a float (e.g., MetricFeatures:3.28),  
    which acts as a global scaling of all the values of the features in  
    this namespace. If value is omitted, the default is 1. It is  
    important that the namespace not have a space between the separator  
    | as otherwise it is interpreted as a feature.
3.  **Features** is a sequence of whitespace separated strings, each of  
    which is optionally followed by a float (e.g., NumberOfLegs:4.0  
    HasStripes) or a string (e.g., city:paris). Each string is a feature  
    and the value is the feature value for that example. Omitting a  
    feature means that its value is zero. Including a feature but  
    omitting its value means that its value is 1. When a string is  
    supplied as the feature value, the value is 1 and the feature index  
    is calculated as hash(feature\_value, hash(feature\_name,  
    namespace\_hash)) where hash’s signature is hash(input, seed). This  
    chained hashing is denoted by a ^ in the audit output.

对上述两个样本数据进行简单的训练测试。

## 训练： ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQ2MjgxNDY_size_16_color_FFFFFF_t_70]

# 测试： #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQ2MjgxNDY_size_16_color_FFFFFF_t_70 1]

[cmake]: https://blog.csdn.net/llwy1428/article/details/95473542
[20210527203119853.png]: /images/20221014/117a7a831f78468cad83a680dad06db7.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQ2MjgxNDY_size_16_color_FFFFFF_t_70]: /images/20221014/31fb5b327b654862a4f9feef675db82c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQ2MjgxNDY_size_16_color_FFFFFF_t_70 1]: /images/20221014/ac5eed69d76d42cab0d424220a0341da.png