Spark：从管道模型中提取 ML 逻辑回归模型的摘要

Question

我已经使用管道估计了逻辑回归。

我在拟合逻辑回归之前的最后几行：

from pyspark.ml.feature import VectorAssembler
from pyspark.ml.classification import LogisticRegression
lr = LogisticRegression(featuresCol="lr_features", labelCol = "targetvar")
# create assember to include encoded features
    lr_assembler = VectorAssembler(inputCols= numericColumns + 
                               [categoricalCol + "ClassVec" for categoricalCol in categoricalColumns],
                               outputCol = "lr_features")
from pyspark.ml.classification import LogisticRegression
from pyspark.ml import Pipeline
# Model definition:
lr = LogisticRegression(featuresCol = "lr_features", labelCol = "targetvar")
# Pipeline definition:
lr_pipeline = Pipeline(stages = indexStages + encodeStages +[lr_assembler, lr])
# Fit the logistic regression model:
lrModel = lr_pipeline.fit(train_train)

然后我尝试运行模型的摘要。但是，下面的代码行：

trainingSummary = lrModel.summary

结果：'PipelineModel' 对象没有属性 'summary'

关于如何从管道模型中提取通常包含在回归模型中的摘要信息的任何建议？

非常感谢！

Answer 1

只需从阶段获取模型：

lrModel.stages[-1].summary

如果模型在流水线中较早，则将 -1 替换为其索引。