• Flutter optimization record (continuous improvement ~)


    This article records the app optimization method, which can check some performance and rendering problems with tools Debug performance issues 1. Track start time flutter run –trace-startup –profile The trace output is saved as start_ up_ info. JSON, the output lists the time from application startup to these trace events (captured in microseconds): When entering […]

  • R data analysis: detailed introduction to the use of tableone package


    Tableone is a package that helps us quickly generate the table1 table in an article. Generally speaking, the first table of an SCI article will give the baseline of the sample. Tableone is a package that can help us quickly summarize and describe the baseline variables of all samples. Today I will write tableone for […]

  • Paper recommendation: predict the performance of downstream models in the early training stage


    Pre training large-scale deep neural network (NN) and fine tuning for downstream tasks have become the current situation in the field of deep learning. A challenge for researchers is how to effectively select the most appropriate pre training model for a given downstream task, because this process usually requires the expensive computational cost for performance […]

  • RT-qPCR


    RT qPCR: PCR is carried out with cDNA as template. In the process of PCR amplification, the PCR process is detected in real time by collecting fluorescent signals. Since there is a linear relationship between the CT value of the template and the initial copy number of the template in the exponential period of PCR […]

  • After learning these 7 CSS attributes, my CSS skills have improved again!


    By Mustapha aouasTranslator: front end XiaozhiSource: dev Like and watch again to form a habit this paperGitHubhttps://github.com/qq44924588… It has been included in the, more classification of highly praised articles in previous periods, and sorted out a lot of my documents and tutorial materials. Welcome star and perfect. You can review with reference to the test […]

  • ACK officially supports equal assurance reinforcement of clusters based on Alibaba cloud Linux operating system


    Introduction: we strengthen the ACK cluster based on Alibaba cloud Linux operating system, which means that Alibaba cloud takes security as an important part in the process of cloud product development and delivery, integrates compliance into the “blood” of the product, and embeds security into the “bone marrow” of the product, which can help customers […]

  • Introduction to VIM operation mode


    What is VIM? VIM is a text editor developed from VI. Code completion, compilation, error jump and other convenient programming functions are particularly rich, which are widely used by programmers. Together with Emacs, it has become the favorite text editor for UNIX like system users. VIM’s design philosophy is a combination of commands. Users have […]

  • Creating AWR baselines for Oracle databases


    The main purpose of creating AWR baseline for Oracle database is to establish an error reported workload view for the database for comparison with other AWR snapshots in the future. Performance statistics for AWR baselines are stored in the database and are not automatically deleted. There are two types of baselines for Oracle databases: fixed […]

  • How to judge whether redis is slowing down


    As an in memory database, redis is fast,So how to judge whether redis is slowing down? What is the standard of slowing downBecause the configuration environment of the machine is different, we can’t simply compare the response time. Redis provides a tool to detect the performance baseline of redis. If it exceeds a certain range […]

  • Canvas — Summary 2


    Canvas drawing Rectangle drawing Rect (x, y, W, H) has no independent path Stroke Rect (x, y, W, H) has independent path, which does not affect other drawing FillRect (x, y, W, H) has independent path, which does not affect other drawing Clearrect (x, y, W, H) the rectangular area to be erased   Arc […]

  • Font structure and text vertical center scheme


    Image source:https://unsplash.com/photos/G…Author: Feng Hao 1. Introduction Vertical center is basically a problem that must be mastered by beginners of CSS. We must have seen “CSS vertical center n” in various tutorials Generally speaking, these methods can meet all kinds of use scenarios. However, when we encounter the situation that we need to use some special […]

  • Inline and inline block of CSS


    CSS inline、inline-block This article will introduce the layout of content and related principles in inline layout. Line box and line box For row box and inline box, there is a classic diagram in the standard document. Attached with a piece of code, easy to understand. <div style=”width: 200px; margin: auto;”> This is a piece of […]