# Questions tagged [modelling]

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

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### 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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### 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 ...
27 views

### How to properly conceptualize and formally model a mathematical definition?

I am trying to write DSL's for mathematical (1) definitions, (2) theorems, and (3) proofs. All 3 of these require different DSLs because they involve different structures for the most part, yet they ...
17 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 ...
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### 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,...
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### 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 ...
29 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: ...
16 views

### modelling communication costs on a network

Consider a set of $N$ computers. Each computer needs to send some data to $K$ other computers, and each computer is receiving data from $K$ other computers (ie. the communication pattern can be ...
18 views

### Is MDP Considered as The Model-based Value Iteration in/of Reinforcement Learning?

Is MDP Considered as The Model-based Value Iteration in/of Reinforcement Learning? If no, then Reinforcement Learning is all about being Model-free learning. Right?
139 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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### 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 ...
114 views

### 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 ...
56 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 ...
371 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 ...
993 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.
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### 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 ...
200 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 ...
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 ...