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Questions tagged [python]

Programming questions are off-topic here. Do not ask questions about how to write code in Python. However, conceptual questions about computer science are more appropriate. See our help center for the scope of this site.

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0answers
13 views

Understanding Hough transform examples in python

I have been reading up about the Hough transform recently, but I want to implement the algorithm (or a follow an existing algorithm such that I understand it) in python. I can't find many resources to ...
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0answers
21 views

Can a Neural Network be Created to Identify the Composer of a Single Song with Python and Tensorflow? [on hold]

I would like to propose a theoretical question. Recently, I have been attempting to complete an experiment involving a neural network. Here are the parameters for my experiment and the specifications ...
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0answers
6 views

How to implement a customize loss function in scikit learn? [closed]

How to implement a customize loss function in scikit learn? For instance instead of using mean squared error. I want to use mean squared error multiplied by the true value of the sample.
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0answers
18 views

Numpy Array of Strings [closed]

I am not sure that this question is suitable for here, but since it is about data science python module, that is numpy, I decided to post it. In python, empty string consumes 49 bytes because it ...
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0answers
6 views

Composite and Non-Composite User-Defined Data Types

I have a learning resource which claims the following about user-defined data types Non-composite include: Enumerated Pointer Composite include: Record Set This confuses me, and I would ...
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0answers
5 views

solving XML problem by Python [migrated]

I have an xml file that contain a lot of information and tags. For example I have this tag: ...
-1
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1answer
57 views

Does this sorting algorithm already exist? And if so, what is its name?

I created this algorithm off the top of my head this morning. It has one loop, therefore it has a time complexity of O(n) and only stores two variable during loop so it has a space complexity O(1) ...
1
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1answer
22 views

After how many iterations will an integer circle back to 0 in Python? [closed]

If this question is completely garbage I apologize because I am new to CS and haven't understood at how programming languages (Python specifically) work. I was reading about how in a standard two-...
0
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1answer
27 views

My code works, But how do I make this code run in a deterministic time?

The Problem: Given 3 inputs Bounce, Ball drop height, and ball view height. How do I calculate the number of times the observer can see the ball pass. So my code gives correct output, but it takes ...
2
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1answer
35 views

Minimum cost node cut

I am interested in solving the following problem: Given an undirected graph whose vertices are weighted, find a subset of vertices of minimal weight whose removal disconnects the graph. Is there ...
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0answers
21 views

Understanding the logic of algorithm runtime

I'm trying to understand the runtime of this code: def f(n): if (n <= 1): return 1 else return f(n-1)*f(n-1) + f(n-1) At first, my logic said ...
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2answers
63 views

Help with Time Complexity

Suppose we have the function below: ...
-1
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1answer
124 views

What is the procedure to find the time complexity of python program? [duplicate]

Is there any kind of function which is used in python to calculate the time complexity of another function?
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0answers
27 views

Is this solution is bad for the coin change problem? [closed]

was doing coin change problem as an assignment(didnt know before), after came with this solution i checked the solutions available couldnt find a similar one like this, just curious. removing the ...
1
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1answer
43 views

Finding a minimum weight path with certain restrictions

I have a directed weighted multigraph whose vertices are sets of URLs. We add to this multigraph all edges of the form $i\to j$ where $i\subset j$ (such edges are of zero weight), where $i$, $j$ are ...
2
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1answer
239 views

Why is this n^2 growth?

I am attempting to understand the growth of the following algorithm, which is described as $n^2$ growth in the book I am reading: "... performs of the order of $n^2$ steps on a sequence of length $n$....
2
votes
1answer
38 views

Why does parallelising slow down this simple problem against looping through all the data?

I've been using multiprocessing and parallelisation for the first time this week on a very large data set using 32 CPUs. I decided to explore it for a smaller task just to see if I could learn ...
1
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1answer
28 views

A problem about slicing and indexing in numpy in Python [closed]

I learned that in numpy, given a vector, slicing and indexing could give different results. I ran the following codes: ...
2
votes
1answer
325 views

How can I optimize 3 variables in order to maximize the end product?

I am in the process of making a cryptocurrency trading bot. Currently, I am doing backtesting over a period of 7 months in which I provide a portion of historical data as if it were in real-life. By ...
3
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1answer
215 views

How to use Latin hypercube sampling with fixed points?

I use Latin hypercube sampling to select what point to evaluate my function. As evaluations take a lot of time, I want to limit the time by adding already evaluated points. I thought about taking the ...
0
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1answer
479 views

Python: Clustering based on pairwise distance matrix [closed]

I have a matrix which represents the distances between every two relevant items. For example, M[i][j] holds the distance between items i and j. My next aim is to cluster items by these distances. I ...
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0answers
33 views

how to build logical representation from dependency tree

I'm trying to build logical representation from dependency tree with python. i created the tree with stanford parser. How can I derive logical presentation from it using Lambda-calculus?
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0answers
32 views

Van Emde Boas Cluster recursion

I have been trying to implement a Van Emde Boas tree in python, but I'm having trouble understanding how exactly it works. In the notes here, It states that the summary of a VEB structure is another ...
1
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0answers
24 views

Open source implementation of Multiscale Combinatorial Grouping [closed]

I would like to use Multiscale Combinatorial Grouping for my PhD research. However, I am restricted to use open-source implementations and this one runs on Matlab. Does anyone know of an equivalent ...
3
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1answer
102 views

Understanding Applicative Evaluation Order with the Z-Combinator

I am trying to understand how the Z-combinator (Y-combinator for applicative order languages) definition came about. As Python is applicative I am using Python for this. So I know Python's evaluation ...
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0answers
25 views

What data structure would be best for a code cross referencer?

I want to write a JavaScript cross referencer (in Python) that will build a cross-reference of JavaScript functions for a given input file. I am trying to think of what Abstract Data Type would work ...
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0answers
27 views

Unusual function - operations on lists / sets - possible optimization

I have a problem. Below I present a function in Python. ...
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0answers
33 views

Finding the best filling of the matrix (optimization)

I try create algorithm for best binary matrix filling. What I mean: I have two matrix exmpl. $$ A = \begin{bmatrix} 1 & 0 & 1 & 1 \\ 0 & 1 & 0 & 1 \\ 1 & 1 &...
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1answer
141 views

Control of the combinatorial aspects of a dynamic programming solution

I am exploring how a Dynamic Programming design approach relates to the underlying combinatorial properties of problems. For this, I am looking at the canonical instance of the coin exchange problem: ...
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1answer
24 views

How is ReLU used in machine learning functions

I've seen how sigmoid would be used in machine learning sigmoid(dot(activations, weights)-bias) like this ^ but sigmoid makes sure your values are between 0 and ...
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0answers
17 views

Creating a Visual Model of Network Traffic Flow

I am a beginner in computer science and networking softwares. I need some help creating a visual model of network traffic flow. I want to create a visual model of a network in flux and the end-to-end ...
-1
votes
1answer
38 views

Using computer vision instead of algorithms?

I have been thinking of a problem i have here with a calendar scheduler where i basically want to split a year into seconds and have access to the dataset of whole year. In this year i assign blocks ...
1
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0answers
22 views

Need a game with AI techqniques [closed]

I want to learn Artificial Intelligence techniques by writing a game (or maybe any fun project). Can you suggest any games? Consider that I'm a beginner in AI, but have basic knowledge Algorithms and ...
1
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2answers
18 views

Distinguishing between side-by-side liquid streams

I'm new to computer vision and am looking for advice. I'd like to perform computer vision on a spiral system, in this system a down flowing liquid separates into different regions based on density: ...
-1
votes
1answer
190 views

list('\a','\b','\c') prints '\x07', '\x08', '\\c' [closed]

In python3.6, I tried In [60]: a = '\a' In [61]: b = '\b' In [62]: c = '\c' In [63]: l =[a, b, c] If test l ...
2
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1answer
179 views

Conditional Shortest Path Through Weighted Cyclic Directed Graph

Vertices in my graph are composed of {name, category} where category is one of {red, grn, blu, ylw}. Edges in my graph are weighted and directed. In the visualization, the thick end of the edge ...
0
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0answers
36 views

Are the terms “Language Implementation”, “Runtime” and “Virtual Machine” synonymous?

To describe the implementation of a dynamic programming language, I have seen the terms "Runtime" (e.g. Security transparency in the Python runtime), "Virtual Machine" (Python Virtual Machine (PVM), ...
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2answers
495 views

Determining time complexity of this function in python [duplicate]

I would like to determine the time complexity of this function, in $\mathcal{O}$-Notation. ...
0
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1answer
31 views

Grammar types constraint after adding a couple of types (and a statement involving them) to a “typeless” language

Foreword : by "typeless programming language", I naively mean "language in which you don't write statements like type x (=) ... to declare(define) ...
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0answers
26 views

Order of domino tiles function [closed]

The domino tiles can be listed in an orderly way as shown in the figure : figure link Write a function such that given two variables ("minor" and "major") where "minor" is the lowest value and "...
1
vote
1answer
76 views

Truth value of a proposition [closed]

I'm trying to write a function in Python that takes it argument as a Python list and returns a boolean value based on the truth vale of the proposition $E(x) \to \exists y \text{ s.t. } x=2y$, where ...