如何解决读取apache mllib演示文件的问题 [英] How to solve the problem with read apache mllib demo file

问题描述

我是 spark 新手，我正在尝试在 Mac 上本地运行来自 Apache Spark MLlib 指南的以下代码.我已经安装了 Java 8、Scala、spark 和 pyspark.Scala 和 pyspark 在终端上工作.

I am new to spark and I am trying to run the following code that comes from the Apache Spark MLlib guide locally on a Mac. I have installed Java 8, Scala, spark and pyspark. Scala and pyspark work on the terminal.

from pyspark.context import SparkContext
from pyspark.sql.session import SparkSession
sc = SparkContext('local')
spark = SparkSession(sc)

from pyspark.ml.classification import LogisticRegression

# Load training data
training = spark.read.format("libsvm").load("sample_libsvm_data.txt")

该文件在项目文件夹中，但出现以下错误:

The file is in the project folder but I get the following error:

    training = spark.read.format("libsvm").load("sample_libsvm_data.txt")
Traceback (most recent call last):

  File "<ipython-input-23-16efb76d78dc>", line 1, in <module>
    training = spark.read.format("libsvm").load("sample_libsvm_data.txt")

  File "/Users/georgioskourogiorgas/anaconda3/lib/python3.6/site-packages/pyspark/sql/readwriter.py", line 166, in load
    return self._df(self._jreader.load(path))

  File "/Users/georgioskourogiorgas/anaconda3/lib/python3.6/site-packages/py4j/java_gateway.py", line 1257, in __call__
    answer, self.gateway_client, self.target_id, self.name)

  File "/Users/georgioskourogiorgas/anaconda3/lib/python3.6/site-packages/pyspark/sql/utils.py", line 63, in deco
    return f(*a, **kw)

  File "/Users/georgioskourogiorgas/anaconda3/lib/python3.6/site-packages/py4j/protocol.py", line 328, in get_return_value
    format(target_id, ".", name), value)

Py4JJavaError: An error occurred while calling o521.load.
: java.lang.UnsupportedOperationException: empty collection

文件没有损坏或为空.

推荐答案

我想通了.首先，出于某种原因，它需要一条路径.虽然，我在 Spyder 中创建了一个项目，但它无法识别工作目录.然后我的路径有一个带空格的文件夹.它也不喜欢那样.

I figured it out. First it needs a path for some reason. Although, I had created a project in Spyder it didn't recognise the working directory. Then my path had a folder with a space. It didn't like that either.

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