1. PR curve 1.1 Principle The PR curve is the abbreviation of Precision-Recall curve, which is used to evaluate the performance of the two-classification model under different thresholds. The horizontal axis of the PR curve is the recall rate (Recall), and the vertical axis is the precision rate (Precision). By plotting the relationship between the […]
Tag: curve
Find pr curve and roc curve based on knn algorithm
Table of Contents 1. Basic principles of knn algorithm 2. What is PR curve? 3. Drawing of pr curve 4.What is ROC curve? 5.Drawing of roc curve 6. Realize drawing pr curve and roc curve pr curve python implementation code: roc implementation code: 1. Basic principles of knn algorithm The knn algorithm is also called […]
Model evaluation: P-R curve and ROC curve
Table of Contents 1. Model evaluation criteria 2. P-R curve Precision, Recall and F1 score confusion matrix Precision Recall F1 score 3. ROC curve TPR and FPR AUC 4. Summary 1. Model Evaluation Criteria Model evaluation metrics are used to evaluate the strengths and weaknesses of different models. In classification tasks, the simplest evaluation indicators […]
P-R, ROC curve – JMU homework
Table of Contents 1. Overview of P-R curve and ROC curve 1.1 Confusion matrix 1.2 PR curve 1.3 ROC curve 2. Draw P-R curve and ROC curve 2.1 Code implementation for drawing P-R curve 2.2 Draw ROC curve 3. The advantages, disadvantages and application scenarios of P-R curve and ROC curve 4. Summary 1. Overview […]
P-R curve and ROC curve
Introduction The P-R curve is a common tool used to evaluate the performance of a classifier, especially suitable for dealing with problems of uneven class distribution. The P-R curve shows the relationship between precision and recall of a classifier at different thresholds. The horizontal axis of the P-R curve is the recall rate, and the […]
osg realizes the movement of objects along the Cardinal spline trajectory curve generated by control points.
Table of Contents 1 Introduction 2. Preliminary knowledge 3. Use osg to implement three-dimensional Cardinal curve 3.1. Tools/Materials 3.2. Code implementation 4. Description 1. Preface When designing vector patterns, we often need to use curves to express the shape of objects. Simply drawing with mouse tracks is obviously insufficient. So we hope to implement such […]
The principles of PR curve and ROC curve and their implementation in python
1. PR curve The principle of 1.1PR curve PR curve (Precision-Recall Curve) is a commonly used classification model evaluation tool, used to measure the performance of binary classification models. The abscissa of the PR curve is the recall rate (Recall), and the ordinate is the precision rate (Precision). Recall rate refers to the proportion of […]
Draw ROC curve and PR curve
In machine learning, it is very important to draw ROC curves and PR curves. How to draw these curves, let’s start with model evaluation. 1. Model evaluation Common classification model evaluation indicators include the following: 1. Accuracy: the proportion of all correctly classified samples to the total samples 2. Confusion Matrix: A table showing the […]
osg implements cubic spline Cardinal curve
Table of Contents 1 Introduction 2. Preliminary knowledge 3. Two-dimensional Cardinal curve implemented by Qt 4. Use osg to implement three-dimensional Cardinal curve 4.1. Tools/Materials 4.2. Code implementation 1. Foreword When designing vector patterns, we often need to use curves to express the shape of objects. Simply drawing with mouse tracks is obviously insufficient. So […]
Implementation of drawing Bezier curves of any order in Qt
The difficulty in programming the bezier curve is to find the coefficients of the curve. If the coefficients are determined, the curve can be drawn with tiny straight segments. The coefficient of the bezier curve is also the Bernstein coefficient. The properties of this coefficient can be determined by yourself. Here we use the recursive […]