Error java util nosuchelementexception next on empty iterator

After pre- processing data and converting it to an appropriate format, I invoke NaiveBayes' s train method to obtain a model, but it fails with an exception. Here is the stacktrace:. I use MLlib in spark and get this error, It turned out that I predict for a non- existing userID or itemID, ALS will generate a matrix for prediction( userIDs * itemIDs), you must make sure that your request is included in this matrix. Scalaでリスト処理 と [ " collections" ] - イテレータ - Scala Documentation を参考にして ます。. toIterator res: Iterator[ Int] = non- empty iterator / / リストをイテレータに変換 scala> it. next res: Int = 1 / / 最初の要素が返ってくる scala> it. next res: Int = 2 / / 次の 要素が返ってくる. 返す要素が無くなる. next res: Int = 3 scala> it. NoSuchElementException: next on empty iterator / / 例外発生.

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  • Video:Util nosuchelementexception iterator

    Empty util iterator

    It seems that when I instantiate a fair number of sizable modules at once, I hit this error as I go into the C+ +. NoSuchElementException: next on empty iterator java. NoSuchElementException: next on empty. Py4JJavaError: An error occurred while calling o3493. NoSuchElementException: next on empty iterator at scala. Iterator$ $ anon$ 2. scala: 39) at case you get this error message, you must add the line export SPARK_ HOME= / usr/ spark to the file / usr/ zeppelin/ conf/ zeppelin- env. Then restart zeppelin and it works fine ; ). Some partitions can be empty ( especially with small test data sets). Its a pretty common pattern to just check if the iterator is empty and return an empty iterator if that is the case at the start of your mapPartitions code. hasNext res21: Boolean = false / / 次の値がない状態でアクセスするとエラー出まくり ですscala> li. NoSuchElementException: next on empty Iterator at scala. < init> ( < console> : 7) SuchElementException: next on empty iterator. This crashes because of the empty string in arr.

    I use MLlib in spark and get this error, It turned out that I predict for a non- existing userID or itemID, ALS will generate a. String] = non- empty iterator scala> it. length) res1: Iterator[ Int] = non- empty iterator scala> res1 foreach printlnscala> it. NoSuchElementException: next on empty iterator. 上記の通り、 it. map の呼び出し の後、 イテレータ.