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I was testing the speeds of a few different ways to do complex iterations over some of my data, and… Read more Python Function Slows Down With Presence Of Large List

I have two arrays like this: A = [[111, ...], B = [[222, ...], [222, ...], … Read more Sort Rows Of Array To Match Order Of Another Array Using An Identifier Column

for a project, I need an efficient function in python that solves to following task: Given a very l… Read more Python - Efficient Function With Scipy Sparse Matrices

I tried to process the same request to the same database using 'Python 2.7.4 + sqlite3' and… Read more Why Python+sqlite3 Is Extremely Slow?

Updated for clarity: I need advice for performance when inserting/appending to a capped collection.… Read more Efficiency When Inserting Into Mongodb (pymongo)

Lets say I create a theano function, how do I run operations in parallel elementwise on theano tens… Read more How Do I Set Many Elements In Parallel In Theano

Suppose I have an pandas series that I'd like to function as a multimap (multiple values for ea… Read more Indexed Lookup On Pandas Dataframe. Why So Slow? How To Speed Up?

I need to compute Information Gain scores for >100k features in >10k documents for text class… Read more Fast Information Gain Computation

I'm looking to optimize the code below which takes ~5 seconds, which is too slow for a file of … Read more Optimize Parsing File With Json Objects In Pandas Dataframe, Where Keys May Be Missing In Some Rows

I'm after generating efficiently pairwise combinations from 1D array(s). Itertools is just too … Read more Fast Combinations Without Replacement For Arrays - Numpy / Python

I was under the impression that numpy would be faster for list operations, but the following exampl… Read more Why Is Numpy List Access Slower Than Vanilla Python?

I developed a python program that does heavy numerical calculations. I run it on a linux machine wi… Read more High Kernel Cpu When Running Multiple Python Programs

So I have two matrices, A and B, and I want to compute the min-plus product as given here: Min-plus… Read more How To Make Min-plus Matrix Multiplication In Python Faster?

I am doing a project to find the speed of a vehicle from images. We are taking these images from wi… Read more Find Speed Of Vehicle From Images

I was experimenting with multiplying large numbers in python. For my purpose I was trying to evalua… Read more How To Multiply Big Numbers Faster?

I am extending my previous question python efficient substring search, I am interested to improve … Read more Python: Improving Sub-string Search By Embedding Sophisticated Algorithms

I am profiling a numpy dot product call. numpy.dot(pseudo,pseudo) pseudo is a numpy array of cust… Read more Reasons Of Slowness In Numpy.dot() Function And How To Mitigate Them If Custom Classes Are Used?

Does someone know why pandas/numpy map is slower then list comprehension? I thought I could optimiz… Read more Why Is Pandas Map Slower Than List Comprehension

In numpy, I have an array of N 3x3 matrices. This would be an example of how I'm storing them (… Read more Multiple Matrix Multiplication

I have a pandas.Series containing integers, but I need to convert these to strings for some downstr… Read more Converting A Series Of Ints To Strings - Why Is Apply Much Faster Than Astype?