我正在尝试基于此处的示例在 apache Spark 上使用 scala 运行独立的应用程序: http://spark.apache.org/docs/latest/ml-pipeline.html
这是我的完整代码:
import org.apache.spark.ml.classification.LogisticRegression
import org.apache.spark.ml.linalg.{Vector, Vectors}
import org.apache.spark.ml.param.ParamMap
import org.apache.spark.sql.Row
object mllibexample1 {
def main(args: Array[String]) {
val spark = SparkSession
.builder()
.master("local[*]")
.appName("logistic regression example 1")
.getOrCreate()
val training = spark.createDataFrame(Seq(
(1.0, Vectors.dense(0.0, 1.1, 0.1)),
(0.0, Vectors.dense(2.0, 1.0, -1.0)),
(0.0, Vectors.dense(2.0, 1.3, 1.0)),
(1.0, Vectors.dense(0.0, 1.2, -0.5))
)).toDF("label", "features")
val lr = new LogisticRegression()
println("LogisticRegression parameters:\n" + lr.explainParams() + "\n")
lr.setMaxIter(100)
.setRegParam(0.01)
val model1 = lr.fit(training)
println("Model 1 was fit using parameters: " + model1.parent.extractParamMap)
}
}
build.sbt 中的依赖项:
name := "example"
version := "1.0.0"
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % "2.0.1",
"org.apache.spark" %% "spark-sql" % "2.0.1",
"org.apache.spark" %% "spark-mllib-local" % "2.0.1",
"com.github.fommil.netlib" % "all" % "1.1.2"
)
但是在 sbt shell 中运行程序后,出现以下错误:
[info] Compiling 1 Scala source to /dataplatform/example/target/scala-2.11/classes...
[error] /dataplatform/example/src/main/scala/mllibexample1.scala:1: object classification is not a member of package org.apache.spark.ml
[error] import org.apache.spark.ml.classification.LogisticRegression
[error] ^
[error] /dataplatform/example/src/main/scala/mllibexample1.scala:3: object param is not a member of package org.apache.spark.ml
[error] import org.apache.spark.ml.param.ParamMap
[error] ^
[error] /dataplatform/example/src/main/scala/mllibexample1.scala:8: not found: value SparkSession
[error] val spark = SparkSession
[error] ^
[error] /dataplatform/example/src/main/scala/mllibexample1.scala:22: not found: type LogisticRegression
[error] val lr = new LogisticRegression()
我可以在 Spark 交互式 shell 中成功运行此代码。我错过了 *.sbt 文件中的某些内容吗?
谢谢, 巴渝
您错过了 MLlib 依赖项:
"org.apache.spark" %% "spark-mllib" % "2.0.1"
本地还不够。
我有同样的问题,并且我有一个 Maven Scala 项目。
我使用了下面的 Maven 依赖项。添加这个maven依赖后,问题就解决了。
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-mllib_2.11</artifactId>
<version>2.0.2</version>
</dependency
我正在尝试使用 sbt 构建 scala 示例并收到错误
object Vectors 不是包 org.apache.spark.ml.linalg 的成员
我已在 lib 文件夹中添加了 Spark-mllib_2.12-3.5.0.jar (应将此 jar 添加到类路径中),但此 jar 文件没有 org.apache.spark.ml.linalg.Vectors 类