这可能很简单,但我无法理解它.谁能给我一个顺序泛滥的例子?在我正在阅读的教科书和互联网资料中说明了这一点
当缓冲帧的数量小于文件中的页面时,这将导致读取文件的每个页面.这是由LRU和重复扫描引起的恶劣情况
#frames <文件中的#个页面.
使用LRU,每次扫描文件都会导致读取文件的每一页."
但究竟是什么呢?为什么会这样?
我正在尝试在此目录中创建一个新目录和一个文件.谁能告诉我哪里出错了?
我正在使用Windows系统,我希望该目录存在于我的.java文件所在的文件夹中.
import java.io.*;
class PS_Task1 {
public static void main(String[] args) {
try {
File file = new File("Library\\test.txt");
file.mkdir();
file.createNewFile();
}
catch(Exception e) {
System.out.println("ecception");
}
}
}
Run Code Online (Sandbox Code Playgroud) 我正在使用heapq从列表列表中获取最大的元素.我写的程序如下.
import csv
import heapq
f = open("E:/output.csv","r")
read = csv.reader(f)
allrows = [row for row in read]
for i in xrange(0,2):
print allrows[i]
allrows.sort(key=lambda x: x[2]) #this is working properly
it=heapq.nlargest(20,enumerate(allrows),key=lambda x:x[2]) #error
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我只想要前20名的元素.因此,我没有考虑使用堆.我得到的错误是,
Traceback (most recent call last):
File "D:\eclipse_progs\DaDv\IMDB\Assignment1.py", line 42, in <module>
it=heapq.nlargest(2,enumerate(allrows),key=lambda x:x[2])
File "C:\Python27\lib\heapq.py", line 470, in nlargest
result = _nlargest(n, it)
File "D:\eclipse_progs\DaDv\IMDB\Assignment1.py", line 42, in <lambda>
it=heapq.nlargest(2,enumerate(allrows),key=lambda x:x[2])
IndexError: tuple index out of range
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我能知道为什么我会收到错误以及如何解决它.有没有使用heapq的属性我缺少.
我正在尝试使用gensim word2vec.我无法训练基于布朗语料库的模型.这是我的代码.
from gensim import models
model = models.Word2Vec([sentence for sentence in models.word2vec.BrownCorpus("E:\\nltk_data\\")],workers=4)
model.save("E:\\data.bin")
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我使用下载了nltk_data nltk.download().我收到以下错误.
C:\Python27\lib\site-packages\gensim-0.10.1-py2.7.egg\gensim\models\word2vec.py:401: UserWarning: Cython compilation failed, training will be slow. Do you have Cython installed? `pip install cython`
warnings.warn("Cython compilation failed, training will be slow. Do you have Cython installed? `pip install cython`")
Traceback (most recent call last):
File "E:\eclipse_workspace\Python_files\Test\Test.py", line 8, in <module>
model = models.Word2Vec([sentence for sentence in models.word2vec.BrownCorpus("E:\\nltk_data\\")],workers=4)
File "C:\Python27\lib\site-packages\gensim-0.10.1-py2.7.egg\gensim\models\word2vec.py", line 276, in __init__
self.train(sentences)
File "C:\Python27\lib\site-packages\gensim-0.10.1-py2.7.egg\gensim\models\word2vec.py", line 407, in train …Run Code Online (Sandbox Code Playgroud) 这是我的第一个JavaScript程序,我遇到了第一个路障.任何人都可以告诉我我在哪里做错了.我想在点击按钮后得到第三个盒子上前两个框的总和
<!DOCTYPE html>
<html>
<body>
<h1>My First JavaScript</h1>
<p>Please input a number.</p>
<script>
function myFunction()
{
var x=document.getElementById("demo").value;
var y=document.getElementById("demo1").value;
var z=parseInt(x)+parseInt(y);
document.getElementById("demo2").value=Z;
}
</script>
<input id="demo" type="text">
<input id="demo1" type="text">
<input id="demo2" type="text" value="">
<button type="button" onclick="myFunction()">Click Me!</button>
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