Submarine active sonar detection signal

Introduction: In this paper, the time-frequency correlation distribution algorithm is used to analyze the active sonar detection sound signal from a submarine in video, but it is still unable to get the result of the frequency change that the submarine and its supervisor hear. The exact reason is not yet understood. Keywords: Submarine, Sonar, ...

Posted by aviavi on Sun, 06 Feb 2022 20:34:19 +0100

Point cloud PCL Library Learning - convert RGBD image into point cloud PCD and display

Article catalogue Problem descriptionSensor model 1. pinhole camera model 2. Depth rangingcode implementationsummaryReference articles 1, Problem description Three dimensional reconstruction aims to represent three-dimensional objects as mathematical models that are easy to deal with in computer. In recent years, due to the rapid ...

Posted by nysmenu on Sun, 06 Feb 2022 19:34:54 +0100

Robot SLAM and autonomous navigation -- environment construction

(1) What is SLAM?    in short, slam is to locate and pose the robot where GPS cannot be used, build incremental maps, and realize the autonomous positioning and navigation of the robot. Like a blind man, he explores the environment with his own hands in the unknown environment, and constantly corrects the map built by his heart to th ...

Posted by munchy on Sun, 06 Feb 2022 05:35:07 +0100

Simulated annealing algorithm

1, Problem description In the actual daily life, people often encounter the following problems: find the function in a given definition field X f ( x ) f(x) The optimal value corresponding ...

Posted by zero_ZX on Sun, 06 Feb 2022 04:33:48 +0100

paddlepaddle 8 Image Test Time Augmentation (enhanced when image data is tested)

The generalization ability of the model can be improved through data enhancement during training, and its accuracy can also be improved through test enhancement (sacrificing a certain speed). This operation is common in the game. The methods of image enhancement include affine change (translation, scaling, rotation, mirror image, etc.) and colo ...

Posted by alvinchua on Thu, 03 Feb 2022 12:11:15 +0100

Classification case: sample imbalance in XGB

Parameter setting There are often problems in XGB classification There are parameters to adjust the sample imbalance scale_pos_weight , Usually, we enter the ratio of negative sample size to positive sample size in the parameter Classification case Create unbalanced dataset import numpy as np import xgboost as xgb im ...

Posted by jakebrewer1 on Thu, 03 Feb 2022 10:42:13 +0100

Machine Learning - Coursera Wu Enda machine learning tutorial Week2 learning notes

Multiple Features Multiple linear regression, which includes multiple variables, such as house age, area, number of rooms, etc., is marked as follows: Suppose the function becomes: It can be understood as: θ 0 means base price θ 1 is the price per square meter, and X1 is the number of square meters θ 2 is the price of each ...

Posted by atawmic on Wed, 02 Feb 2022 23:52:48 +0100

Introduction to deep learning: Theory and Implementation Based on Python reading notes: Chapter 6 learning related skills

catalogue Chapter 6 learning related skills 6.1 parameter update 6.1.1 explorer's story 6.1.2 SGD 6.1.3 disadvantages of SGD 6.1.4 Momentum 6.1.5 AdaGrad 6.1.6 Adam 6.1.7 which update method to use 6.1.8 comparison of update methods based on MNIST dataset 6.2 initial value of weight 6.2.1 can the initial value of weight be set to 0 ...

Posted by Black Rider on Wed, 02 Feb 2022 20:44:56 +0100

Target level emotion analysis based on SKEP pre training model

Target level emotion analysis based on SKEP pre training model As we all know, human natural language contains rich emotional colors: expressing people's emotions (such as sadness and happiness), expressing people's mood (such as burnout and depression), expressing people's preferences (such as like and hate), expressing people's personality c ...

Posted by sprint10s on Wed, 02 Feb 2022 17:18:15 +0100

Python+API: a perfect match for reading public data

This article is translated from Python & APIs: A Winning Combo for Reading Public Data Article code address https://github.com/realpython/materials/tree/master/consuming-apis-python?__s=kea6w26ii09uqhijmy0b Python+API: a perfect match for reading public data go to top Learning to use different APIs is a magical skill, and many applica ...

Posted by p.persia69 on Wed, 02 Feb 2022 12:13:37 +0100