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推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...显然匹配前两个词都不如直接匹配英超来得准确，系统该如何体现出关键词的这种“重要性”呢？这时我们便可以引入词权的概念。在大量的语料库中通过计算（比如典型的TF-IDF算法），我们可以算出新闻中每一个关键词的权重...
Choosing a file in Python with simple Dialog
...t askopenfilename
Tk().withdraw() # we don't want a full GUI, so keep the root window from appearing
filename = askopenfilename() # show an "Open" dialog box and return the path to the selected file
print(filename)
Done!
s...
Recursively list files in Java
...ic class Filewalker {
public void walk( String path ) {
File root = new File( path );
File[] list = root.listFiles();
if (list == null) return;
for ( File f : list ) {
if ( f.isDirectory() ) {
walk( f.getAbsolutePath() );
...
Find the files that have been changed in last 24 hours
E.g., a MySQL server is running on my Ubuntu machine. Some data has been changed during the last 24 hours.
6 Answers
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.gitignore all the .DS_Store files in every folder and subfolder
...he .gitignore file, but it seems that it is only ignoring .DS_Store in the root directory, not in every folder and subfolder.
...
Are multiple `.gitignore`s frowned on?
...s, it seems it would be simplest to just have one .gitignore file at the root of the repo than various ones throughout. Is there a standard best practice on this or some analysis online of when one approach is better than the other?
...
“Insufficient Storage Available” even there is lot of free space in device memory
...o the same thing if you get the "invalid MMI" error when you try this on a rooted, modded phone.
– ChrisC
Nov 14 '13 at 1:52
3
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Definition of a Balanced Tree
...:
People define the height of an empty tree to be (-1).
For example, root's left child is null:
A (Height = 2)
/ \
(height =-1) B (Height = 1) <-- Unbalanced because 1-(-1)=2 >1
\
C (Height = 0)
Two more exam...
What is global::?
...
It's a sometime-necessary prefix indicating the root namespace.
It's often added to generated code to avoid name clashes with user code.
For example, imagine you had a class called System, but then you wanted to use System.String. You could use global::System.String to d...
AngularJS : Prevent error $digest already in progress when calling $scope.$apply()
... Note that in some cases I have to check but the current scope AND the root scope. I've been getting a value for $$phase on the root but not on my scope. Think it has something to do with a directive's isolated scope, but..
– Roy Truelove
Jan 14 '13 at 15...