python iterable and iterator
An object is called an iterable object if it has an __iter__ method. List, tuple, dict are all iterable objects[reference]: The __iter__ method returns an iterator object. An object is […]
Learn Hands-On Machine Learning with Scikit-Learn and TensorFlow-Chapter 3
In the chapter 3 of the book “Hands-On Machine Learning with Scikit-Learn and TensorFlow”, the author plays a big joke with the readers. The fetch_mldata function in the python module […]
How to run jupyter?
If you are learning machine learning on your computer. The first thing would be running the jupyter app to do some hands-on. Running this program is not similar to running […]
Simulate mouse click using jQuery
We’ve talked about simulating mouse click in C language. Today, we’ll learn how to simulate mouse click in jQuery. There seem quite a few methods to simulate a mouse click […]
QWebEngineView does not show
I have a very simple test project based on QtWebEngine: ——webengineview.h——- #ifndef WEBENGINEVIEW_H #define WEBENGINEVIEW_H #include <QWebEngineView> class WebengineView : public QWebEngineView { Q_OBJECT public: WebengineView(QWidget *parent = 0); ~WebengineView(); […]
How to convert bin to integer in PHP?
I have a project in which I need to convert a byte into an integer: <?php $a=md5(“hello”,true); echo $a[15]*1.0/255.0; The second parameter of md5 is set to true in order […]
Learn Hands-On Machine Learning with Scikit-Learn and TensorFlow
The chapter 2 of this book is a little difficult to learn because it is a hands-on project using python. It is not a simple hello world python program, but […]
python dataframe
In python, you have many ways to represent a 2-dimensional array. You can use list like:[[1,2],[3,4],[5,6]], you can use ndarray in numpy like:numpy.array([[1,2],[3,4],[5,6]]), you can also use dataframe in the […]
python numpy
If you learn python based AI software such as tensorflow, you’ll inevitably meet the package Numpy and DataFrame,etc. So you must learn how to use Numpy and DataFrame before you […]
Parse XML in Qt
In Qt, there seem a lot of classes related to XML:QDomDocument, QXmlStreamReader,QXmlSimpleReader,etc. You can choose any one to parse an XML document. QDomDocument is more powerful but keep all content […]