Questions tagged [k-nn]

K-Nearest Neighbor (K-NN) is a classification algorithm that determines the label of some data point based on the most common label of the closest k other points.

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11 views

Error in UseMethod("train") [closed]

This is my Rstudio script for a KNN model: ...
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1answer
26 views

How different classifiers would perform on a particular data set

I am reading through and learning how different ML methods work on different types of data, but I have faced a data set that I am not sure how ML methods, such as decision tree, Naive Bayes, and KNN, ...
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37 views

How to determine the number of K in KNN

I have a question about how many k values (k=1 or k=5 or k=50) to choose in the following two scenarios. I initially thought choosing k=5 will be the right choice of k for both because it will ...
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14 views

KNN search of high-dimensional embedding vectors

I have a large database of n-dimensional numerical vectors. Each vector is the embedding of a vertex into n-dimensional vector space. Vertices belong to a graph, and an algorithm such as ...
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52 views

New classification in Machine Learning KNN model

This is my example of KNN model (I write it using R): ...
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1answer
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Comparison of classifier confusion matrices

I tried implementing Logistic regression, Linear Discriminant Analysis and KNN for the smarket dataset provided in "An Introduction to Statistical Learning" in python. Logistic Regression ...
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What is the principial difference between zero-shot learning and k-NN and clusterization based methods?

One can consider clustering and k-NN to be a zero-shot, too? I think there is no much principal difference, except using some neural network architecture (usually it is a transformer) which is used to ...
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17 views

How to find the right number for a training set for machine learning

I would like to develop a machine learning algorithm using the knn model to perform a classification of my data records. My question is: is there a general method to follow to determine how large my ...
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23 views

Taking the squared Euclidean distance for kNN classification of images

A problem I'm working on states: Computes the squared Euclidean distance between each element of the training set and each element of the test set. Images should be flattened and treated as vectors. ...
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What is the validation strategy for approximate string search?

I am working a approximate string search algorithm. I am wondering how to go with validating that an algorithm is better than another. I can not come up with validation set, since I have no example of ...
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Is creating decision surface necessary in k-NN?

I am new to machine learning and I came across this question. *1) [True or False] k-NN algorithm does more computation on test time rather than train time. Solution: A The training phase of the ...
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K-NN algorithm with maximum distance to be considered a neighbor

Is there a variant of the k-NN algorithm where the label returned is: the average of values of the k nearest neighbors that are closer than a given threshold to the query data point? no value if ...
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32 views

Algorithms for SMS spam detection

Which among KNN, Logistic and Naive Bayes would yield best results for SMS spam detection? Is there any other efficient approach worth exploring. I am planning to make a python application for SMS ...
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Does knn extend the train dataset by test values during the prediction?

Lets say I have 100 values in my dataset and split it 80% train 20% test. When predicting the last value, is the prediction based on previous 99 (80 test + 19 already predicted values) or only the ...
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If we dont specify any distance in KNN model, how is n_neighbors parameter calculated?

If we don’t specify the distance, how is the n_neighbors calculated?
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When using KNeighborsClassifier, what is the motivation of using weights="distance"?

When using KNeighborsClassifier, what is the motivation of using weights="distance"? According to the scikit-learn ...
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31 views

how interacting variables (known in statistics as moderating variable) are handled by KNN algorithm?

Can someone intuitively explain how interacting variables are being handled by KNN.according to the book "Introduction to Data Mining": Nearest neighbor classifiers can handle the presence ...
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Mean Accuracy and Standard Error of the Accuracy for KNN Classification algorithm

The given below code snippet is from the assignment of online course IBM ML with Python. Here's the assignment. The used variable names :mean_acc and ...
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84 views

KNN accuracy going worse with chosen k

This is my first ever KNN implementation. I was supposed to use (without scaling the data initially) linear regression and KNN models for predicting the loan status(Y/N) given a bunch of parameters ...
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Why exactly KNN is outperforming Parzen by a huge margin in classificaton task

I'm trying to implement a Naive Bayes classifier, which uses either of hypercubic Parzen window or KNN to estimate a density function. The data I'm using is Fashion MNIST. The steps I take are that ...
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KNN Variance using a high value of K and cross-validation

it has come to my understanding, that a value of K=1, gives a high variance because we are only using only one data point, hence we are very likely to model the noise in that training example. Bias: ...
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Machine Learning - Euclidian Distance Classifier exercise [closed]

I'm taking part in an elective subject at university which mainly focuses on the foundations of Machine Learning. Now we got our first exercise - this task should be done practically in any language (...
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Applying Sci-kit Learn's kNN algorithm to Fresh Data

While I was studying Scikit-learn's kNN algorithm, I realized that if I use sklearn.model_selection.train_test_split, the provided data gets automatically split ...
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What is difference between Nearest Neighbor and KNN?

I was taking the tutorial of making Recommendation system , there I read that Nearest Neighbor is different from KNN classifier . Could anyone explain that what is Nearest Neighbor and how it is ...
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How to fit a KNN and then a linear regression with those neighbors?

How do I fit a KNN to get the $k$ nearest neighbors and then aggregate the those neighbors into a fit using a linear regression (instead of a weighted average) in Scikit-Learn? I've tried creating a ...
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How to get KNN linearly hybridised by two similarities?

I'm writing a KNN (collaborative filtering) hybrid similarity recommender and I need some advice. It is based on this paper. I've currently got 2 datasets. The first one is ...
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57 views

Why is KNN better at K-Fold Cross Validation than XGBoost or Random Forest?

I've been running K-Fold cross validation multiple times for KNN, random forest and XGBoost. KNN can complete sklearn's cross_val_score, so much faster consistently. They all use the same preprocessed ...
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Calculate euclidean distances for KNN and cross validation given a 99x16 10 folds

I'm trying to implement KNN classification with cross-validation implementation in python. The data consists of 10 folds of size 99x64, each with their corresponding label of size 99x1. Do I have to ...
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KNN efficient implementation

The KNN algorithm is very handy and particularly suited to some of my problems, but I can't find any resources on how to implement it in production. As a comparative example, when I use a neural ...
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kNN for non-ordinal variables

kNN is a distance-based method, so it requires the input to be in numerical form. I was wondering if it is possible to use kNN imputer for non-ordinal categorical variables (like color). Since the ...
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train_test_split() Error: cannot reshape array of size 900000 into shape (100,100,3) [closed]

I am fairly new to python and I have a program for data classification using the k-nearest neighbor method. But I encountered an error when running the program. Here my source code: ...
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Difference between KNN-DTW and DTW Template matching?

Is there a distinction between kNN-DTW and DTW template matching? Essentially DTW template matching computes the DTW for each point in the training set, similar to the KNN-DTW algorithm. Is there a ...
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DTW and kNN-DTW time complexity

I have implemented KNN using a custom DTW metric with sci-kit learn and as shown below: ...
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51 views

Is it valid to add MAPE as a margin to prediction output?

I've trained a KNNRegressor on predicting used car prices. A given car's actual selling price is R289,995. My model predicts R260,911. I want to be able to tell the user My knn model predicts the deal ...
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KNN with high-variance data [closed]

KNN doesn't work well with high-variance data, so how should I fit my data? Here is an example of what the data looks like:
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Which algorithm should I choose and why?

My friend was reading a textbook and had this question: Suppose that you observe $(X_1,Y_1),...,(X_{100}Y_{100})$, which you assume to be i.i.d. copies of a random pair $(X,Y)$ taking values in $\...
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Understanding Learning Curves

I would like to clarify my understanding of learning curves with two example plots below. I am experimenting with small data sets here between 500 and 1500 samples to clarify my understanding. My ...
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Is it possible to use kNN with streaming data

I have built a kNN model using scikit learn that is able to predict a binary outcome very well. The data itself is quite basic, it is simply a 1-D waveform. When feeding the waveform into the model ...
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509 views

Random Forest vs K Nearest Neighbor as non linear classifier [closed]

When classes are non-linearly separable, which of the following methods performs better? Choose correct one :- Logistic Regression Random Forest K Nearest Neighbor Classification Linear Regression ...
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what is store in leaf node and split node in Annoy or any approximate nearest neighbor model built using tree?

Im trying to understand the working of annoy and have read the code _make_tree since im not from C++ background im trying hard to figure out the logic of whats stored in leaf node and split node ,you ...
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Does Sklearn's KNeighborsClassifier Map Input to Output If Dimensions Don't Match?

I want to classify a hyperspectral image (Indian Pines data set). The input is of shape (145, 145, 200) = a HSI of 145x145 px with 200 bands. Each one of the 145x145 pixels should be classified to one ...
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Optimal selection of k in K-NN

I am currently reviewing some concepts related to Machine Learning, and I started to wonder about the hyperparameter selection of K-NN classifier. Suppose you need to solve a classification task with ...
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102 views

Does shuffling the training data matter in a K Nearest Neighbors Classifier model?

I am new to machine learning and I have a couple of questions about a project. So, I created a classifier using the MNIST data set for a ML project that I was working on. I augmented the data by ...
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Same accuracy on KNN for different distance metrics

I am new to data analysis and I am trying to run a kNN classifier on a lung cancer dataset with multiple attributes. For all k values I tasted (1 to 10), I obtain the same accuracy when using either ...
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128 views

Estimate eps value in DBSCAN using KNN algorithm

I would like to estimate the best eps value for the DBSCAN algorithm on this dataset by following this set of rules: Set a minPts: 10 Compute the reachability distance of the 10-th nearest neighbour ...
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2answers
34 views

Impossible to increase model accuracy [closed]

I'm building binary classification models on my company's dataset. The problem I'm having is that I haven't been able to increase the accuracy of my models. I have trained, tuned, cross validated ...
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1answer
187 views

Combine K-nearest neighbor with categorical embedding

I've tried a few ways to do my multi-class classification. For categorical data, I used the embedding technique with Tensorflow, which moves the entity closer with its similarity. This technique ...
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623 views

Learning with Positive labels only

I have ~7 million rows of customer data (~500 sparse attributes) A million out of them have opted in to a new service. How do I use this signal to predict which of the remaining customers are likely ...
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60 views

Missing value Imputation in dataset

I have two separate files for Testing and Training. In the training data, I am dropping rows that contain too many missing values . But , In the test data , I cannot afford to drop the rows so I have ...