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    自动滑块验证码识别_滑块验证码原理

    有爬虫,自然就有反爬虫,就像病毒和杀毒软件一样,有攻就有防,两者彼此推进发展。而目前最流行的反爬技术验证码,为了防止爬虫自动注册,批量生成垃圾账号,几乎所有网站的注册页面都会用到验证码技术。其实验证码的英文为 CAPTCHA(Completely Automated Public Turing test to tell Computers and Humans Apart),翻译成中文就是全自动区分计算机和人类的公开图灵测试,它是一种可以区分用户是计算机还是人的测试,只要能通过 CAPTCHA 测试,该用户就可以被认为是人类。由此也可知道激活成功教程滑块验证码的关键即是让计算机更好的模拟人的行为,这也是激活成功教程的难点所在。(注:本文18年所作,仅作参考)

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    fio基础11

    rdma The RDMA I/O engine supports both RDMA memory semantics (RDMA_WRITE/RDMA_READ) and channel semantics (Send/Recv) for the InfiniBand, RoCE and iWARP protocols. falloc IO engine that does regular fallocate to simulate data transfer as fio ioengine. DDIR_READ does fallocate(,mode = keep_size,) DDIR_WRITE does fallocate(,mode = 0) DDIR_TRIM does fallocate(,mode = punch_hole) e4defrag IO engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate defragment activity in request to DDIR_WRITE event rbd IO engine supporting direct access to Ceph Rados Block Devices (RBD) via librbd without the need to use the kernel rbd driver. This ioengine defines engine specific options. gfapi Using Glusterfs libgfapi sync interface to direct access to Glusterfs volumes without options. gfapi_async Using Glusterfs libgfapi async interface to direct access to Glusterfs volumes without having to go through FUSE. This ioengine defines engine specific options. libhdfs Read and write through Hadoop (HDFS). The 'filename' option is used to specify host, port of the hdfs name-node to connect. This engine interprets offsets a little differently. In HDFS, files once created cannot be modified. So random writes are not possible. To imitate this, libhdfs engine expects bunch of small files to be created over HDFS, and engine will randomly pick a file out of those files based on the offset generated by fio backend. (see the example job file to create such files, use rw=write option). Please note, you might want to set necessary environment variables to work with hdfs/libhdfs properly. mtd Read, write and erase an MTD character device (e.g., /dev/mtd0). Discards are treated as erases. Depending on the underlying device type, the I/O may have to go in a certain pattern, e.g., on NAND, writing sequentially to erase blocks and discarding before overwriting. The w

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    最前沿:机器人学习Robot Learning之模仿学习Imitation Learning的发展

    在上一篇文章最前沿:机器人学习Robot Learning的发展 - 知乎专栏 中,我们介绍了机器人学习Robot Learning这个方向的发展趋势,并介绍了部分基于DRL的方法,那么在本文,我们将继续介绍一下最近发展起来的机器人学习的一个重要分支------模仿学习Imitation Learning。通过深度增强学习Deep Reinforcement Learning,我们可以让机器人实现从0开始学习一个任务,但是我们人类学习新东西有一个重要的方法就模仿学习,通过观察别人的动作从而完成学习。因此,模仿学习Imitation Learning就是这样一个应运而生的方向:希望机器人也能够通过观察模仿来实现学习。

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    IBM首个人造神经元幕后,神经形态计算系统向人造大脑突破

    【新智元导读】日前,IBM苏黎世研究院研究人员利用相变存储材料,制造出首例随机兴奋人工神经元。《经济学人》评论,这是在人造大脑方面的又一突破。模仿大脑的概念简单,但实际把它做出来却相当难。有了IBM 的这项突破,今后再将随机相变神经元集群与其他纳米计算材料结合在一起,能够成为下一代超密神经形态计算系统的关键。 没有人知道人脑是如何工作的,因此研究人脑的研究员才想出了“模拟”的方法。常见的方法是用神经形态元件制作出一个人造大脑。计算机科学家早就从生物学中汲取灵感,最近被称为“深度学习”的人工智能技术,就是模仿

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