# Questions tagged [classification]

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### linear relationship between the log-odds and the features

In this post I asked about why the sigmoid/softmax function was used in classification: Binary Classification- Non-Differentiable Loss Function But I have a followup question: We're assuming that the ...
1 vote
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### Binary Classification- Non-Differentiable Loss Function

For binary classification using linear regression, we pass the output z of the linear regression through the sigmoid function so that if the linear regression takes an input x which should be ...
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### Predict output using image and text variables as input

I need to implement a solution where I will have an image and other text variables as temperature, humidity and precipitacion. I wish to preview the inflow as output based on these inputs. I suspect ...
29 views

### algorithm to categorize courses into academic degree requirements?

In most US universities, undergraduate students must satisfy the requirements of a degree program in order to graduate. The general rules are: The university has a minimum number of total credits ...
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### How to optimally construct queries asking about the class of an object to eventually find it?

Consider the following problem stated formally: You are given $n$ objects $o_1$, $o_2$, ..., $o_n$ and $k$ classes $c_1$, $c_2$, ..., $c_k$, each class containing some objects; an object is chosen. ...
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1 vote
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### What is a good appropriate algorithm for localization for images?

Assume that you have an image that you going to classify its class ID. One good option is to use interest points e.g FAST that can find coners/edges inside an image. From these points you could ...
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### Classifying vectors that only contains 1001110101 numbers - Is Support Vector Machine the solution?

Assume that you are given a vector 0b1101001001011001 etc. And you are going to classify it. One can use Support Vector Machine, but is that method good for ...
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### Is Local Binary Pattern gaussian distributed?

Local Binary Pattern is a way to determine a pixel, with a single number by comparing the center pixel with its neigbours. The result will be a binary number. Dos this number have a gaussian ...
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### Transductive Information Maximization vs classification with feature embedding in higher dimensional spaces?

Recent research work has shown that transductive learning/inference outperforms standard methods that were used before, where people embed features in a high dimensional space and then use the ...
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1 vote
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### Schoolclass Optimization Algorithm for finding Stable Matching

I have the task to write a program that puts students in classes and that in the best possible way. We have given the name, the foreign language a student chooses(french or latin), a profile (Music,...
1 vote
149 views

### Transductive Learning vs Inductive Learning in Machine Learning

Several recent research work has shown that transductive learning/inference outperforms inductive learning/inference during classification problems. This has been found in few-shot learning, other ...
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1 vote
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### How can a Machine Learning model predict this classification problem?

I am pretty new to ML and have a basic but fundamental question. Let’s imagine we want to create a simple Sentiment Analysis model using Machine Learning not Deep Learning algorithms, so we need to ...
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### vertex-deletion and edge-deletion parameters

Let $\mathcal{G}$ be a graph class. For any class $\mathcal{H}$, we know that the minimal number of vertices that has to be removed from $G\in \mathcal{H}$ such that we get a graph from $\mathcal{G}$ ...
1 vote
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### How should one interpret the minhash error rate?

On Wikipedia the error rate for the minhash algorithm vs baseline jaccard similarity is stated as 1/sqrt(1/hashes). But, how should one interpret this number in a ...
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### What is meant by A determine BC in functional dependency. How the validity of this statement will be checked

We use notation A determines BC in a database for functional dependency. Same way we use equations in mathematics which shows dependency of variables. We have inference rules in logics, functions in ...
1 vote
55 views

### Find the exactly correct separating hyperplane of SVM when the data is not perfectly linearly separable

I am thinking about the following case where the data in region 1 is always positive and the data in region 2 is always negative, but the data in region 3 can be both positive and negative. Are there ...
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### What are the confusion matrix values?

I'm currently going through past paper questions and was wondering if I could get some help answering this one? 'Consider a classification model which is applied to a set of records, of which 100 ...
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### Does Linear Discriminant Analysis make dimensionality reduction before classification?

I'm trying to understand what LDA exactly does when used as a classifier, i've understood how the dimensionality reduction works and i've understood that the classification task is carried out with ...
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### SVMs - Fat (Margin) Boundary: Why is $\max\frac1{||\theta||}=\min \frac{ ||\theta||^2}{2}$?

I am trying to understand SVMs in depth watching lectures from MIT. The professor to reduces the classification problem into an optimization problem. To do that, he first defines the decision and ...
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1 vote
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### LSTM : What should I do if I am always getting an output too close to one value?

I am training a model for ham and spam classification using LSTM. I am indicating the spams as 0, and the hams as 1. However, the dataset has much more hams than spams, so I tend to get an output very ...
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### Classification of the Summit supercomputer

Can we classify a supercomputer in more than one group? For example, Flynn's classification, classification according to topology, classification according to memory access. For the Summit ...
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### What are Volterra classifiers

I want to learn about Volterra classifiers in-depth to understand the following papers Papers https://openaccess.thecvf.com/content_cvpr_2014/papers/Kang_Convolutional_Neural_Networks_2014_CVPR_paper....
29 views

### ML Algorithm for getting top pick in each sample

I have a dataset of streets - and each street contains several houses. ...
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### Bible Verse division

I'm working on a project compiling various versions of the Bible into a dataset. For the most part versions separate verses discreetly. In some versions, however, verses are combined. Instead of verse ...
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### classify location of the expiry date on drug label and lot number

Is it possible that using the Machine Learning classification model we can classify/predict the LOCATION/ORIENTATION of the lot number and expiration date on different vials label? If yes, possible ...
1 vote
116 views

### How can Machine Learning be used to find attributes/characteristics of graphs?

I am aware ML is not necessary for many graph classification problems (as the graph theorists have many clever solutions), but I'm specifically interested in ML approaches to these types of questions. ...
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### Image classification with zero data

Given an image of a biology diagram, I would like to classify the diagram into these 4 categories: Plant Animal Cell Anatomy However, I don't have any training data. I would like to avoid the ...
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### Mapping categorical data in K-nearest neighbour

I have a data set which contains categorical data, for example: ...
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### Classifying partially labeled data

I have 1D data for binary classification. Data includes about 10000 samples and each sample has the length of 120. Data is only partially labeled (for about 20% of samples, I am sure about the label) ...
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### Classification accuracy based on top 3 most likely classifications

My goal is to recommend jobs to job seekers based on their skill set. Currently I'm using an SVM for this, which is outputting one prediction, e.g. "software engineer at Microsoft". However, consider ...
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1 vote
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### Hypothesis space in AdaBoost or general Machine learning

I was curious about the following: in most learning algorithms, when an algorithm is said to learn a concept class $C$ then the algorithm outputs a function from the hypothesis space $H$ and often ...
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### Examples of Regular, Context-free and Context-sensitive languages

Assume the languages: $$a) \, L_1 = \{ w \in \{b,c \}^* | \, w \, \text{contains 'bbc' as substring} \}$$ $$b)\, L_2 = \{ 1^k 0^m 1^m | k,m \in \mathbb{N} \}$$  c)\,L_3 = \{ w \in {0,1}^* | \,...
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1 vote
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### Algorithm for out-of-area point classification

I have a device that sends its coordinates every 30 seconds. When I receive the coordinates, I classify the point as either belonging to (ie being inside) one of a number of predefined areas (so I ...
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### What is the purpose of standardization in machine learning?

I'm just getting started with learning about K-nearest neighbor and am having a hard time understanding why standardization is required. Reading through, I came across a section saying When ...
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### Dimension Reduction - Which feature should remove to reduce the dimension of the matrix

Let's suppose that we have the following 2 tables: If we want to reduce the dimension by one(in every table) which feature we should remove and why ? I am confused about the way that i should work ...
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### SVM with a priori information about class probabilities

Given are two 2-d sets, each with its own bivariate normal distribution. I need to build an SVM classifier. The a priori probabilities of each class corresponds to the size of its set (20/50 for the ...
862 views

### Random Forest - Conditional Permutation Importance

I've been looking for the most unbiased algorithm to find out the feature importances in random forests if there are correlations among the input features. Besides the most commonly preferred ...
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### k-means clustered data: how to label newly incoming data

I have a data set with labels that were produced by a $k$-means clustering algorithm. Now there is some data (with the same data structure) from another source and I wonder what is the most sensible ...
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### Resource allocation / optimization

At work I stumbled across this problem of allocating resources: We are given a set of objects belonging to one of seven possible classes (multiple objects per class are allowed). We distinguish ...
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### Classify/Distinguish between 8008 binary grids, with 13 queries

I have $8008$ binary grids of size $6 \times 10$ (they are all grids with the property described below), which I want to distinguish between with at most $13$ queries. A query will determine if the ...
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### Choose the best classifier to predict the label of strings of a regular language

I have to tackle this problem: I have some strings that are my training set. These strings belong to a regular language corresponding to a deterministic finite automata (hidden namely I don't now it, ...
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1 vote
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### Classifying a problem involving matching bit arrays

First explaining the "reverse" use as a background: There is an array A which contains N boolean values There is an array B which contains N boolean values I start iterating over array A and for ...
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1 vote
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### Why do reviewers always want to compare the method with deep learning baselines and Big data?

I work on the topics of sparse coding (SC) and dictionary learning (DL), in which classification is not the main goal, but the discriminative power of the representation is one of the concerns. ...
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### Given $k$ points in $n$-dimensions, such that $n\geq3$, is there a polytime algorithm for finding a curve that splits them into 2 sets of points?

So in this math exchange question I asked, it was proven that for $n>2$ dimensions, you can always find a curve that separates $k$ points in $n$-dimensional space into $2$ arbitrary sets that you ...
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### How to show that i have significant improvements over the baselines?

I had review feedbacks regarding my recent publications and reviewers argued that the improvements are not significant over the baselines. I tried my classification algorithm on some image datasets ...
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1 vote
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### Why don't Artificial Neural Networks Commonly Diverge?

Introduction: I'm using divergence here as to mean that the gradient is getting further and further from zero in stochastic gradient descent. I've written my own feed-forward neural network and tried ...
1 vote
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### The well-known classifiers that can be trained/tested in linear time [closed]

I am interested in collecting the list of the classifiers that (depending on their setting) can have linear time complexity (both in training and testing step) with respect to the number of samples $n$...
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### How to find a possibility of match in Naive Bayes Classifier?

My math level is very very poor so I can't get the statistics. Can anyone explain in simple words? I.e. if I have frequency data: ...
1 vote
50 views

### Attribute Selection for minimum number of clusters

I have a table consisting of some headers $P, Q, R, S$ (shown in blue in Table 1). According to the headers, the column $T$ is populated using some predefined logic. Now, any of the headers $P,Q,R,S$ ...
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