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apache spark - Unable to infer schema for Parquet. It must be specified manually

I am running all the code from within EMR Notebooks. spark.version '3.0.1-amzn-0' temp_df.printSchema() root |-- dt: ... does not apply to me. Please help me out. Thank You !!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - xamarin (ios) httpclient get and post to router without internet connection

I have one esp8266(arduino) project, at the first time, device start as a Access point, so the mobile can connect via ... > <dict> <key>NSAllowsArbitraryLoads</key> <true/> </dict>...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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在vue-cli中引入图标字体时出错

在vue-cli中引入图标字体时出错文件存在，并且引用的路径没有问题，出现如下报错 Can't resolve '../fonts/sell-icon.eot?k5xf13' in '/Users/shaojianheng/demo/src ... -loader": "^0.5.8", webpack.config.js中的配置如下图所示求大神指教...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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git创建分支后无法提交代码？（已解决）

创建分支后直接把分支clone下来，imp到eclipse后想要提交修改的代码但是却提示要输入git密码，输入后却无法通过，应该怎么解决？ plus：把之前生成的密钥文件放到当期工程引用的目录下就行了...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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类似tower的任务排序怎么的做，求思路

把任务3（任务3在第三个位置），放在第一个位置以及从一个分类，放在另一个分类下面，这个过程的思路。类似tower的排序怎么的做，求思路...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Placement new with move constructor vs move assignment in folly small_vector

While researching ideas for a constexpr vector-like container, I ran into folly's small_vector container. I was ... never call the destructor on uninitialized memory anyway, right?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Does $unionWith run parallel query on independent collections?

Think that I have 3 collections. I want to run $unionWith to fetch data from those three collections. db.getCollection(' ... }} , ]) Will this be parallel or sequential ?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如何判断后台返回的字符串中包含换行？

如题后台返回的数据：在接口文档显示的数据：在chrome上console出来的数据：（这两条数据是我随机打印的，只是为了显示后台是有换行的而已）最后显示是一行显示，没有换行效果的，需要前端处理我先检测是否包含换行符 for ( ... 打印出来的索引里面的数据并没有换行符，是不符的请问我这样写是正确的吗？或者我需要换个条件判断？求指教~...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift 获取视频缩略图

取得本地视频之后，需要缩略图用于展示（需要获取到第0秒的图片）视频格式.mov和.mp4的 func getVideoImage(videoUrl: URL) ... error, NSUnderlyingError=0x12d6f07c0 {Error Domain=NSOSStatusErrorDomain Code=-12935 "(null)"}}...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Docker for Windows (Hyper-v) 和 Vagrant (VirtualBox) 共存问题

目前公司的开发环境 windows + vagrant (VirtualBox) 如果想用Docker for Windows来做开发环境, 虚拟机必须用Hyper-v 问题来了虽然可以设置开机启动项从而让hyper-v VirtualBox ... Hyper-v背不知道大家在widnwos环境遇到这个问题没，遇到这个问题的怎么解决的...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vs code扩展主机意外终止。请重新加载窗口以恢复。

今天手贱，看到提示更新，就把vscode给更新了；结果遇到报错：扩展主机意外终止。请重新加载窗口以恢复。上图：...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Is it possible to print over already printed text? Or to clear already printed text?

I am trying to make a function that will count down from 10 to 1 and only show one number at a time. ex: after ... entire screen.) Thanks in advance to anyone who tries to help!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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新手试运行了一个 caffe 的 Python 代码，出现这个错误是怎么回事？

完全的 caffe 新手，研究了一天的 caffe ，虽然糊里糊涂的， GitHub 上找了个项目： https://github.com/BestiVicto... 在网上找了个 Python 代码照猫画虎写成如下： import numpy as np ... 别嘲笑了哈，想问一下这个如果 Python 实现的话该怎样写？希望能得到解答，真诚谢谢~...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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解释一下vertical-align出现以下现象的原因吗？

<div class="coder"> <img src="images/code2.png" style="vertical-align:middle;"> <span>打开微信，扫描二维码,<br>用手机观看视频</span> </div> .coder{ width: ... 的解释，但是还是不理解，也百度过，还是不懂，可能需要一些通俗的解释才理解吧...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Small xarray object killing Dask worker when attempting computations

I am working with an hourly temperature dataset and trying to pare it down to daily max/min/average values for a ... why it's getting overloaded. Any advice would be wonderful!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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git - Push existing folder to GitLab

In Gitlab project from the instructions, they tell how to add an existing_folder to Git repository. But after I press git ... ] git add . git commit git push -u origin master...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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匹配末尾的端口号

提取这个字符串的末尾端口号 2017-04-17 08:16:14 INFO connecting lh3.googleusercontent.com:443 from 111.111.111.111:26215 我可以用grep awk 做出来 1.grep ... awk '{b=gensub(/^(.+)d+)$/,"2","g";print b}'...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如题，感谢~...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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anchor - Laravel 8: Route [admin.states.create] not defined

I am new to Laravel, but am getting along. But I am having problem with anchor tag using the laravel style. From my / ... admin.add_state'); } Please what do I do wrong? thank you...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - Searching a single MySQL text column with fuzzy matching

I have a MySQL InnoDB table with a 'name' column (VARCHAR(255)) which I want users to be able to search against, returning ... a way, even though each string is at most 3-4 words....

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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C Polynomial Addition exercise

I am currently working on an exercise for algorithm class. I was asked to write a C program which adds two polynomials entered ... I tried to put as much information as I could. :)...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - dict update not working but printing same dict works

I have created a dict and want to use some of it's values as key for another dict. Source dict: { "Index": [ "A", " ... 2,3 value. for index, _ in enumerate(<some 3 element list>):...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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有些不确定的因素大家会选择存成变量吗？~

比如说一个外部方法返回的一个对象你需要用到里边的一个属性(假设这个属性不是 Object 类型而且可能会更新不能存成变量..的话) 那么你们会把这个属性的 key 存起来吗万一改属性名了这边直接改变量就好~ 还有就是自己写 ... 名为 id 那么假如我以后程序迭代想往对象里加值的话有一个更加符合 id 这个 key 名的我想改的话怎么办 ...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java web 现在做搜索功能，用什么比较好呢

在做一个图片浏览的站，一张图片包含n个标签现在是分为图片一个表，标签一个表，图片-标签一个表最初做的是用like查询空格分隔出来的关键词，比如关键词男士鞋，会把所有有男士或鞋的查询出来，若是查询男 ... 最多的java版搜索引擎是Lucene，不知道它能和ssm整合并做成分页查询效果么？若是使用分词器进行分词，有什么比较合适的呢？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Different columns select for each object in linq

my object model is: Link I want to have a select on "Staff" table based on the definition access level in "TrusteeAccess ... " Table is large. what is that linq query per user?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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docker的volume里npm安装出错

我在docker-compose里的volume挂载了本地目录到docker 然后在docker的目录里run npm install 报了一个错误 EBUSY: resource busy or locked, rmdir '/data/analytics/node_modules/@plugins/View' 不知道该如何解决...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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PHP读取word,还要读取里面的表格样式

现在需求就是，想读取比如一个带表格的word文档，就比如说，下面的表格。我只想要 array( “部门：技术部”， “日期：2017.4.24”, “主持人”: "啊啊啊" ) 这样的一种结构，请问php技术上有办法实现吗？谢谢各位大哥，大姐了我现在已完成的是，纯文字的word文档。。...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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轮播图中出现的跳跃问题

轮播项一共有四个，屏幕可以出现三个，我在html中并排放置了两份，用来实现无线轮播，可是当位置在起点时，点击前移按钮会出现跳跃过程，可我在chrome调试中一步步执行并不会跳跃，这是怎么回事？js代 ... ('+(-425)*index+'px)'; //移动到index==3 timer=setInterval(move,2000); //开启定时器 }...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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