大约有 47,000 项符合查询结果（耗时：0.0560秒） [XML]
如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...aking sure to try different parameters within each algorithm as well), and select the best one by cross-validation. But if you’re simply looking for a “good enough” algorithm for your problem, or a place to start, here are some general guidelines I’ve found to work well over the year...
Update a column value, replacing part of a string
...
Try using the REPLACE function:
mysql> SELECT REPLACE('www.mysql.com', 'w', 'Ww');
-> 'WwWwWw.mysql.com'
Note that it is case sensitive.
share
|
impr...
How to generate .json file with PHP?
...
Here is a sample code:
<?php
$sql="select * from Posts limit 20";
$response = array();
$posts = array();
$result=mysql_query($sql);
while($row=mysql_fetch_array($result)) {
$title=$row['title'];
$url=$row['url'];
$posts[] = array('title'=> $titl...
“The breakpoint will not currently be hit. The source code is different from the original version.”
...was just build for x86 in that dialog, while my local machine is x64! So I selected the Any CPU option and it works again.
– JP Hellemons
Jul 11 '12 at 7:28
3
...
Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?
... the settings panel by clicking on the padlock and entering your password.
Select the PostgreSQL user and click on the minus button.
Restore your shared memory settings:
sudo rm /etc/sysctl.conf
That should be all! The uninstall wizard would have removed all icons and start-up applications file...
How can I find out if I have Xcode commandline tools installed?
...u will get an alert. You can verify that you have installed it by
$ xcode-select -p
/Library/Developer/CommandLineTools
And to be sure then enter $ gcc --version
You can read more about the process here: Xcode command line tools for Mavericks
...
Application Skeleton to support multiple screens
...clipse, it's easy to create multiple emulators (from the Eclipse menu bar, select Window > AVD Manager > New) configured with values for real devices:
Name the emulator for the real device it's emulating
Specify Resolution, don't use Built-in generic sizes
Set the device density to match the ...
Understanding keystore, certificates and alias
...d Application Package option of the Eclipse Android tool, you are asked to select a keystore first, and then asked to select a single alias/entry/pair from that keystore. After providing the passwords for both the keystore and the chosen alias, the app is signed and the public key (the certificate) ...
'dragleave' of parent element fires when dragging over children elements
...
Combine with css child selector to reach all children of your dropzone: .dropzone * {pointer-events: none;}
– Philipp F
Jun 10 '15 at 9:00
...
What are .NET Assemblies?
...Visual Web Developer, you can add a reference to an assembly explicitly by selecting the menu option Website, Add Reference, and selecting the name of the assembly that you need to reference. For example, adding a reference to the System.Messaging.dll assembly results in the web configuration file i...