# Questions tagged [modelling]

Questions on how to represent real-world or non computer science problems with computer science tools.

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### A lower bound for the makespan of heterogenous fog nodes

Why there is a sigma in the denominator of equation (8) in the picture? suppose we have n tasks and m fog nodes.
• 25
22 views

### What is the best way to predict a continuous score based on image characteristics(pixels)?

I have a dataset with 9912 images, what is the best way to train them based on the pixels and features of the images to be able to predict a continuous target ranging from 1 to 100? The goal is to ...
• 1
1 vote
54 views

### How to model an inverse "token relationship" in Petri nets?

Suppose I have the following Petri net: I wonder whether it is possible to model an inverse relationship between $p2$ and $p3$. Basically what I want to achieve is to make either $t1$ or $t2$ ...
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1 vote
11 views

### Best way to deal with strongly correlated variables in a prediction problem?

I am doing a prediction assignment as part of a machine learning course using loans data. I have just done some exploratory data analysis on my dataset of just over 9000 rows. There are 11 variables ...
19 views

### implementing a 802.15.4 math model based on a paper. How to verify it

I am implementing a mathematic model for predicting the congestion of 802.15.4 network based on the paper: Performance analysis of IEEE 802.15.4 non-beacon mode with the unslotted CSMA/CA Based on the ...
21 views

### Search algorithm for multidimensional space with custom topology

First, let's start with the description of the problem in dimension 1: Let $T_0$ be a space with $n$ nodes organized in a tree structure, with $m$ of those nodes defined as target nodes. In this space,...
• 101
1 vote
36 views

### Explanation of roofline model

I am currently studying the roofline model. Wikipedia  shows the following example graph: The diagonal line shows $\beta * I$. But I do not understand why this line does not go through the zero ...
32 views

### How to specify mutated types mathematically?

Say I have an object which I pass to a method, and the method returns that same object, just mutated. So it goes like this: ...
• 1,931
165 views

### How do you have a type typed "Type" when implementing a programming language?

I am working on the base of a language model, and am wondering how to represent the base type, which is a type Type. I have heard of an "infinite chain of ...
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56 views

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54 views

### How to simulate systems' unavailability?

I am simulating a system where the clients' unavailability is one big issue to the systems behavior. I gathered the real system logs to analyze the unavailability of the clients in the deployment ...
• 275
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### CNF form of variable assignment problem

There are n variables $x_1$, $x_2$,..., $x_n$ and each one of them takes values from 1 to k (k>= n) and all are distinct. How can I represent this in the CNF form? (I tried the trivial way of trying ...
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58 views

### An alternative to the object paradigm

I've been playing around with an alternative to the standard object-oriented paradigm for modeling data, and I would like to know if there is any research or already existing systems along the same ...
• 153
1 vote
381 views

### Scheduling N variable-time interdependent tasks across M workers

I have N tasks, each of them requires some time to complete. Time to complete is not the same for all tasks. Each task may depend on a number of other tasks (assume, that no dependency cycles are ...
• 111
1k views

### Stereotype in UML

What is a Stereotype in Unified modelling language?And What are the primary class stereotypes?.I need clear explanation using diagrams or real world scenario.
46 views

### choosing right neural network architecture and input features

As a short example suppose we have a kind of pollution sensor and a jet fan in a tunnel. Jet fan turn on/off according to the automatic scenario based on pollution sensor value. Pollution itself ...
• 1
228 views

### Modelling a dependency of multiple transitions on data in one place

We are modeling our process using a colored Petri net. One of the limitations we have is that when multiple transitions depend on one place, only one of those transitions will fire because then the ...
• 305
1 vote
71 views

### How to mitigate the hierarchical error propagation in tree-structured classification

Suppose we have a multi-class classification problem, where the number of classes $K \geq 3$ We use a tree structure of multiple SVMs to divide and conquer the problem, with one example in the figure ...
• 11
1 vote
43 views

### Middle ground between model-based and model-free approaches

In the context of the reinforcement learning domain, the dichotomy between model-based (learn a model and used it to determine a controller) and model-free (learn a controller without learning a model)...
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538 views

### Dynamic Shortest Path with Linear Programming

Consider a grid with $x=5$ columns, $y=5$ rows, and $T$ timesteps. There are $N=2$ agents in this grid, which can move vertically or horizontally. The positions of each agent $x$ at timestep $t$ is ...
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