我有一个类似以下的Spark数据框:
topics.show(2)
+-----+--------------------+--------------------+--------------------+
|topic| termIndices| termWeights| topics_words|
+-----+--------------------+--------------------+--------------------+
| 0|[0, 39, 68, 43, 5...|[0.06362107696025...|[, management, sa...|| 1|[3, 1, 8, 6, 4, 1...|[0.03164821806301...|[objectives, lear...|+-----+--------------------+--------------------+--------------------+only showing top 2 rows
然而,当我尝试使用以下方法将其转换为 pandas 数据框(在 1.6 版本中有效)时,会出现错误。
topics.toPandas()
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-165-4c1231b68769> in <module>()
----> 1 topics.toPandas()
/Users/i854319/spark2/python/pyspark/sql/dataframe.pyc in toPandas(self)
1440 """
1441 import pandas as pd
-> 1442 return pd.DataFrame.from_records(self.collect(), columns=self.columns)
1443
1444 ##########################################################################################
/Users/i854319/spark2/python/pyspark/sql/dataframe.pyc in collect(self)
307 [Row(age=2, name=u'Alice'), Row(age=5, name=u'Bob')]
308 """
--> 309 with SCCallSiteSync(self._sc) as css:
310 port = self._jdf.collectToPython()
311 return list(_load_from_socket(port, BatchedSerializer(PickleSerializer())))
/Users/i854319/spark2/python/pyspark/traceback_utils.pyc in __enter__(self)
70 def __enter__(self):
71 if SCCallSiteSync._spark_stack_depth == 0:
---> 72 self._context._jsc.setCallSite(self._call_site)
73 SCCallSiteSync._spark_stack_depth += 1
74
AttributeError: 'NoneType' object has no attribute 'setCallSite'
不确定在Spark 2.0.2中是否存在此方法的错误或出现了问题?