本文整理汇总了Python中pyspark.ml.feature.StringIndexer.labels方法的典型用法代码示例。如果您正苦于以下问题：Python StringIndexer.labels方法的具体用法？Python StringIndexer.labels怎么用？Python StringIndexer.labels使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类pyspark.ml.feature.StringIndexer的用法示例。
在下文中一共展示了StringIndexer.labels方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: VectorAssembler
# 需要导入模块: from pyspark.ml.feature import StringIndexer [as 别名]
# 或者: from pyspark.ml.feature.StringIndexer import labels [as 别名]
train_feature_df = train_feature_df.drop('time')
test_feature_df = test_feature_df.drop('time')
assembler = VectorAssembler(
inputCols=list(set(train_feature_df.columns) - set(['result', 'home_name', 'away_name'])),
outputCol="features")
train_df = assembler.transform(train_feature_df)
test_df = assembler.transform(test_feature_df)
labelIndexer = StringIndexer(inputCol="result", outputCol="indexedResult").fit(feature_df)
train_df = labelIndexer.transform(train_df)
test_df = labelIndexer.transform(test_df)
label_mapping = dict(enumerate(labelIndexer.labels()))
reverse_mapping = {}
for key in label_mapping:
reverse_mapping[label_mapping[key]] = key
# ## Dimensionality reduction
#
# Feature selection is not really supported yet in mllib, therefore, we just applied dim reduction using PCA
# In[509]:
pca = PCA(inputCol="features", outputCol="pca", k=15).fit(train_df)
train_df = pca.transform(train_df)
test_df = pca.transform(test_df)