M5P from PackageRWeka

Mohamed Bah 1

After running that command for R (from Machine Learning with R) in Azure Databricks Notebook:

library(SparkR)
library(RWeka)
m.m5p <- M5P(quality ~ alcohol + sulphates , data = wine_train)

I obtained this :

Error in .jcall(o, "Ljava/lang/Class;", "getClass") : Error in .jcall(o, "Ljava/lang/Class;", "getClass") :
java.lang.NoClassDefFoundError: no/uib/cipr/matrix/Matrix
Error in .jcall(o, "Ljava/lang/Class;", "getClass") :
java.lang.NoClassDefFoundError: no/uib/cipr/matrix/Matrix

When I used R I did not have that issue. The problem occured only when I moved to Azure Databricks Notebook (for R).

Any idea.
Thank you in advance

PRADEEPCHEEKATLA-MSFT 89,291 Reputation points Microsoft Employee

2020-11-12T10:37:55.947+00:00
Hello @Mohamed Bah ,

Welcome to the Microsoft Q&A platform.

I would like to repro the scenario, could you please help me with the below questions:

How you have installed Package RWeka via Azure Databricks Notebook?

Share the complete steps which you are trying, along with the screenshot of the error message?
Mohamed Bah 1 Reputation point

2020-11-12T11:56:11.26+00:00

Thank you Pradeep.
In detail this is what I was doing:

%sh
ls -l /usr/bin/java
ls -l /etc/alternatives/java
ln -s /usr/lib/jvm/java-8-openjdk-amd64 /usr/lib/jvm/default-java
R CMD javareconf

%r
install.packages(c("rJava", "RJDBC"))
dyn.load('/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so')
library(rJava)
library(SparkR)
library(RWeka)
whitewines_raw<- read.df("/mnt/datalakeformlwithr/whitewines.csv", source = "csv", header="true", inferSchema = "true")
wine<-as.data.frame(whitewines_raw)
str(wine)
hist(wine$quality)
summary(wine)

I wanted to build a model tree using a M5 algorithm

m.m5p <- M5P(quality ~ alcohol + sulphates , data = wine)

Thank you in advance
PRADEEPCHEEKATLA-MSFT 89,291 Reputation points Microsoft Employee

2020-11-16T05:55:18.373+00:00

Hello @Mohamed Bah ,

Apologize for the delay in response.

When I tried the above steps, I'm experiencing a different error message. Could you please share the Databricks Runtime version which you are running?
Mohamed Bah 1 Reputation point

2020-11-16T08:04:48.007+00:00

7.4 (includes Apache Spark 3.0.1, Scala 2.12)
Mohamed Bah 1 Reputation point

2020-11-16T08:07:16.557+00:00

This is the version:
7.4 (includes Apache Spark 3.0.1, Scala 2.12)
PRADEEPCHEEKATLA-MSFT 89,291 Reputation points Microsoft Employee

2020-11-17T09:23:24.67+00:00

Hello @Mohamed Bah ,

Thanks for sharing the details. I’m working with the product team and get back to you when I have more information..
PRADEEPCHEEKATLA-MSFT 89,291 Reputation points Microsoft Employee

2020-12-08T10:53:41.693+00:00

Hello @Mohamed Bah ,

Unfortunately, I have not received much input on this from the internal team.

For a deeper investigation and immediate assistance on this issue, if you have a support plan you may file a support ticket, else could you please send an email to AzCommunity@Microsoft.com with the below details, so that we can create a one-time-free support ticket for you to work closely on this matter.

Subject of the email: <ATTN: PRADEEP - M5P from PackageRWeka>

Thread URL: M5P from PackageRWeka

Subscription ID:

Please let me know here once you have done the same.

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M5P from PackageRWeka

I wanted to build a model tree using a M5 algorithm

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