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Nearest neighbors in high-dimensional data?
...an function, which in python, looks like this:
def weight_gauss(dist, sig=2.0) :
return math.e**(-dist**2/(2*sig**2))
To calculate a predicted value using your kNN code, you would identify the n nearest neighbors to the data point whose response variable you wish to predict ('test instance'),...
std::function vs template
...VS2012 CTPNov calc1: 0.8 seconds
VS2012 CTPNov calc2: 2.0 seconds
VS2015 (14.0.23.107) calc1: 1.1 seconds
VS2015 (14.0.23.107) calc2: 1.5 seconds
MinGW (4.7.2) calc1: 0.9 seconds
MinGW (4.7.2) calc2: 20.5 seconds
The calculated results of all bin...
What is the most effective way for float and double comparison?
... values in certain cases) your arithmetic will be correct. For example 4.0/2.0 will be the same as 1.0+1.0. This is as long as you do not do things that result in fractions (4.0/3.0) or do not go outside of the size of an int.
...
What is the Sign Off feature in Git for?
...r@example.com>
Source: http://gerrit.googlecode.com/svn/documentation/2.0/user-signedoffby.html
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Declaration/definition of variables locations in ObjectiveC?
...d properties can be declared.
Before "modern" Objective-C (in "old" Obj-C 2.0) you didn't have a lot of choices. Instance variables used to be declared in the header between the curly brackets { }:
// MyClass.h
@interface MyClass : NSObject {
int myVar;
}
@end
You were able to access these v...
ASP.NET Identity DbContext confusion
...dditional items here as needed
}
To save time we can use AspNet Identity 2.0 Extensible Project Template to extend all the classes.
Second Option:(Not recommended)
We actually don't have to inherit from IdentityDbContext if we write all the code ourselves.
So basically we can just inherit from ...
Best practices/guidance for maintaining assembly version numbers
...ly Version but to set all the values in the File Version. For example:
1.2.0.0 (AssemblyVersion)
1.2.3.4 (FileVersion)
This gives you the ability to roll out hot fixes which will not break existing code because the assembly versions do not match but allow you to see the revision/build of an asse...
Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
... number and n equal to 10. In this scenario, pown_l won. glibc pow() took 12.0 user seconds, pown took 7.4 user seconds, and pown_l took only 6.5 user seconds. So that's not too surprising. We were more or less expecting this.
Then, I let x be constant (I set it to 2.5), and I looped n from 0 to 19...
In C++, is it still bad practice to return a vector from a function?
...::accumulate(v.begin(), v.end(), sum); by for (int k : v) sum += std::sqrt(2.0*k);:
Conclusions
Using output parameters instead of returning by value may provide performance gains by re-using capacity.
On a modern desktop computer, this seems only applicable to large vectors (>16MB) and smal...
Do zombies exist … in .NET?
...ments may be valuable to readers.
Immortal Blue pointed out that in .NET 2.0 and up finally blocks are immune to thread aborts. And as commented by Andreas Niedermair, this may not be an actual zombie thread, but the following example shows how aborting a thread can cause problems:
class Program
...