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How to find out what type of a Mat object is with Mat::type() in OpenCV
...to help with identifying your opencv matrices at runtime. I find it useful for debugging, at least.
string type2str(int type) {
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
uchar chans = 1 + (type >> CV_CN_SHIFT);
switch ( depth ) {
case CV_8U: r = "8U"; break;
cas...
Multiprocessing - Pipe vs Queue
...re than two points to communicate, use a Queue().
If you need absolute performance, a Pipe() is much faster because Queue() is built on top of Pipe().
Performance Benchmarking
Let's assume you want to spawn two processes and send messages between them as quickly as possible. These are the timing...
Hashing a dictionary?
For caching purposes I need to generate a cache key from GET arguments which are present in a dict.
11 Answers
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How to extract the decision rules from scikit-learn decision-tree?
... feature_names[i] if i != _tree.TREE_UNDEFINED else "undefined!"
for i in tree_.feature
]
print "def tree({}):".format(", ".join(feature_names))
def recurse(node, depth):
indent = " " * depth
if tree_.feature[node] != _tree.TREE_UNDEFINED:
name = f...
Sibling package imports
...below, modifying sys.path is still a quick-and-dirty trick that works well for private scripts, but there has been several improvements
Installing the package (in a virtualenv or not) will give you what you want, though I would suggest using pip to do it rather than using setuptools directly (and ...
How to avoid explicit 'self' in Python?
...stion to remove python from it. I think that it belongs there. (and thanks for the answer!)
– bguiz
Nov 1 '10 at 3:25
3
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How to write a large buffer into a binary file in C++, fast?
...
int main()
{
FILE* pFile;
pFile = fopen("file.binary", "wb");
for (unsigned long long j = 0; j < 1024; ++j){
//Some calculations to fill a[]
fwrite(a, 1, size*sizeof(unsigned long long), pFile);
}
fclose(pFile);
return 0;
}
I just timed 8GB in 36sec, whi...
Python memoising/deferred lookup property decorator
...re a real bottleneck to calculate that first time and only really accessed for special cases. Hence they can also be cached after they've been retrieved from the database (this therefore fits the definition of memoisation where the input is simply "no input").
...
Pythonic way to find maximum value and its index in a list?
...
There are many options, for example:
import operator
index, value = max(enumerate(my_list), key=operator.itemgetter(1))
share
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improve this answ...
How can i query for null values in entity framework?
...
Workaround for Linq-to-SQL:
var result = from entry in table
where entry.something.Equals(value)
select entry;
Workaround for Linq-to-Entities (ouch!):
var result = from entry in table
where (v...