我试图运行一个简单的NaiveBayesClassifer使用hadoop,得到这个错误
Exception in thread "main" java.io.IOException: No FileSystem for scheme: file
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1375)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1390)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:196)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:95)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:180)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:175)
at org.apache.mahout.classifier.naivebayes.NaiveBayesModel.materialize(NaiveBayesModel.java:100)
代码:
Configuration configuration = new Configuration();
NaiveBayesModel model = NaiveBayesModel.materialize(new Path(modelPath), configuration);// error in this line..
modelPath指向NaiveBayes.bin文件,配置对象正在打印 -Configuration: core-default.xml, core-site.xml
我认为这是因为罐子,任何想法？
What is the fastest way to query a huge XML file in java,
DOM - xpath : this is taking lot of time,
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
docBuilderFactory.setNamespaceAware(true);
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document document = docBuilder.parse(new File("test.xml"));
XPath xpath = XPathFactory.newInstance().newXPath();
String xPath = "/*/*[@id='ABCD']/*/*";
XPathExpression expr = xpath.compile(xPath);
//this line takes lot of time
NodeList result = (NodeList)expr.evaluate(document, XPathConstants.NODESET);
with last line in code, program finishes in 40 secs and without it in 1 second.
SAX : I don't …
我在 html 中有 2 个 div 元素：
<body>
<div id="one"></div>
<div></div>
</body>
我想用id="one"CSS 隐藏 div 后的 div 元素，我尝试了以下方法：
#one:after{display:none}
这没有其他办法吗？
我想显示一个下拉列表选择来自数据库的某个值.
<select name="plans">
<option>MAP</option>
<option>CP</option>
<option>CPA</option>
<option>CPF</option>
</select>
从PHP/Mysql中的数据库中读取值,让我们说"CPA",如何选择此选项？