小编min*_*niQ的帖子

当我尝试从python终端导入时,我得到了这个错误,虽然我按照所有步骤安装xgboost,不知何故python无法获取包详细信息.我对python相对较新,我可以轻松安装numpy和pandas包,我用过此链接可在MACOSX上安装http://xgboost.readthedocs.io/en/latest/build.html

>>> import xgboost
   Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   ImportError: No module named xgboost

当我执行pip install xgboost时,我收到此错误,

Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/h7/pyph_7qj6171tqp50cf2xc7m0000gn/T/pip-build-TEvbD6/xgboost/ 

我在打印sys路径上得到这个,

print sys.path

['','/ System/Library/Frameworks/Pepy.framework/Version/2.7/lib/python27.zip','/ System/Library/Frameworks/Pepy.framework/Version/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin','/ System/Library/Frame /Python.framework/Version/7.7/lib/python2.7/plat -mac','/ System/Library/Frame /Python.framework/Version/2.7/lib/python2.7 /plat-make/lib -scriptpackages','/ System/Library/Frame /Python.framework/Version/2.7 /lib/python2.7/lib-tk','/ System/Library/Frame /Python.framework/Version/7.7/lib/python2.7/lib-old','/ System/Library/Frameworks/Python.framework /Versions/2.7/lib/python2.7/lib-dynload','/ Library /Python/2.7/site-package','/ System/Library/Frame /Python.framework/Version/7.7/Extra/lib/python ','/ System/Library/Frame /Python.framework/Version/7.7/Extras/lib/python/PepyB'

• 问题 1：我可以使用元组作为 Scala 中映射的键吗？
• 问题 2：如果是，如何创建以元组为键的映射？

• 问题3：我想将scala映射转换为RDD，在以下情况下我该怎么做？我正在尝试这样做

  var mapRDD = sc.parallelize(map.toList)
  

  Run Code Online (Sandbox Code Playgroud)

  这是正确的做法吗？

• 问题 4：对于这个特定的代码片段，当我在地图上执行 println 时，它没有值。

我没有包含整个代码，基本上mapAgainstValue包含userId作为键和朋友列表作为值。我想重新创建一个映射 RDD，并在键中进行以下转换。地图为空的原因是什么？

var mapAgainstValue = logData.map(x=>x.split("\t")).filter(x => x.length == 2).map(x => (x(0),x(1).split(",")))
     var map:Map[String,List[String]] = Map()
            var changedMap = mapAgainstValue.map{
              line =>
                var key ="";
                for(userIds <- line._2){
                    if(line._1.toInt < userIds.toInt){
                      key =line._1.concat("-"+userIds);
                    }
                    else {
                      key = userIds.concat("-" + line._1);
                    }
                  map += (key -> line._2.toList)
                }
            }
            changedMap.collect()
            map.foreach(println)