Programming VIP

1, Definition of HIVE Hive is a data warehouse tool based on Hadoop, which can map structured data files into a data table, and can read, write and manage data files in a way similar to SQL. This Hive SQL is abbreviated as HQL. Hive's execution engines can be MR, Spark and Tez. essence The essence of Hive is to convert HQL into MapReduce task ...

1. Introduction to heap sorting Heap sorting is a sort algorithm designed with heap as the data structure. Heap sorting is an optional sort with the worst, best, and average time complexity of O(nlogn), which is also an unstable sort. Large Top heap and Small Top heap A heap is a complete binary tree with the following properties: Each ...

GCD queue usage file First look at the official documents. DispatchQueue is a class object, which inherits from DispatchObject; DispatchObject implements OS_ Method in object, guess OS_object may be a protocol, which is not found in the document First look at DispatchObject: func activate() Activates the dispatch object. func resume() ...

Image features Similar to text features, image features are also a kind of data that is very difficult to mine by gradient lifting tree model. At present, image related problems, such as image classification and image segmentation, are almost neural network-based models. However, in some multimodal problems, such as commodity search recommen ...

1, Introduction SIFT, scale invariant feature transformation, is a description used in the field of image processing. This description has scale invariance and can detect key points in the image. It is a local feature descriptor. 1. SIFT algorithm features: (1) It has good stability and invariance, can adapt to the changes of rotation, scale s ...

1, Introduction 1 Retinex 1.1 theory Retinex theory began with a series of contributions made by land and McCann in the 1960s. Its basic idea is that the color and brightness of a point perceived by human beings are not only determined by the absolute light entering the human eye, but also related to the color and brightness around it. Retinex ...

The management system developed by the company has the function of workflow graphical design and viewing, which has a long history of development. In those dark days, IE almost unified the Jianghu, so it was logical to adopt the VML technology, which was very popular at that time. Later, as we all know, IE began to decline, and VML technology ...

The second part (Networking) describes the protocols used on UNIX system and the technology used to set up, expand and maintain network and Internet Oriented server. In addition, it also introduces the upper network software, including domain name system, e-mail, single sign on and Web hosting. Chapter 13 TCP/IP networking 1. Basic knowle ...

1, Experimental purpose Master the basic principle of DPCM codec system. Preliminarily master the experiment, program the DPCM encoder with C/C++/Python and other languages, and analyze its compression efficiency. 2, Main equipment Personal computers with Windows and Visual Studio software installed 3, Experimental content 1. DPCM encoding ...

1, Parse view process No matter what the return value type of the request processing method is, it will be encapsulated into a ModelAndView return, and then a View object will be obtained through the ViewResolve parser to render the page through the View object. 2, View and view parser After the request processing method is executed, a Mo ...