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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...
move_uploaded_file gives “failed to open stream: Permission denied” error
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This is because images and tmp_file_upload are only writable by root user. For upload to work we need to make the owner of those folders same as httpd process owner OR make them globally writable (bad practice).
Check apache process owner: $ps aux | grep httpd. The first column will be ...
How do I check if a SQL Server text column is empty?
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For MySQL the correct syntax is: SQL SELECT * FROM TABLE WHERE IFNULL(FIELD, '')=''
– Cláudio Silva
Jan 27 at 10:40
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Installing a local module using npm?
...or maybe other applications?), there is some buzz around npm linking being root cause of specific kind of issue. Example here and here
– The Red Pea
Apr 20 '17 at 23:03
4
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How to show disable HTML select option in by default?
I am new to HTML and PHP and want to achieve a drop-down menu from the mysql table and hard-coded too. I have multiple select in my page, One of them is
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NullPointerException accessing views in onCreate()
...ent onCreateView(), calling findViewById() on the inflated fragment layout rootView:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
View somethin...
How to define custom configuration variables in rails
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# config/initializers/load_config.rb
APP_CONFIG = YAML.load_file("#{Rails.root}/config/config.yml")[Rails.env]
# application.rb
if APP_CONFIG['perform_authentication']
# Do stuff
end
share
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im...
Django rest framework nested self-referential objects
...ution works but the count output of my serializer is wrong. It only counts root nodes. Any ideas? It's the same with djangorestframework-recursive.
– Lucas Veiga
May 3 '17 at 1:29
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cscope or ctags why choose one over the other? [closed]
... there any way to make ctags more accurate? I did make tags in the kernel root dir and have been playing with jumping around and most of the time end up in the wrong place. I read that ctags has problems with the c preprocessor, but considering that ctags is used in lxr there obviously must be som...
What is the string concatenation operator in Oracle?
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CONCAT is also compatible with other DBMSes (at least MySQL and Postgres).
– lapo
Oct 13 '15 at 15:07
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