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https://issues.apache.org/jira/browse/SYSTEMML-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15868468#comment-15868468
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Imran Younus commented on SYSTEMML-1238:
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I tested LinearRegCG.dml script with the same data set that is being used in
this test and get the correct results from the dml script. Here is how I ran it:
{code}
$SPARK_HOME/bin/spark-submit --master=local --driver-memory=6g
$SYSTEMML_HOME/target/SystemML.jar -f
$SYSTEMML_HOME/scripts/algorithms/LinearRegCG.dml -nvargs
X=/user/iyounus/data/diabetes_X_train.txt
Y=/user/iyounus/data/diabetes_y_train.txt B="beta.txt" icpt=1
{code}
But if I run the python test, then I get incorrect results. Just to complete,
here is how I'm running the test:
{code}
$SPARK_HOME/bin/spark-submit --master=local --driver-memory=6g
--driver-class-path $SYSTEMML_HOME/target/SystemML.jar test_mllearn_df.py
{code}
I hope this helps.
> Python test failing for LinearRegCG
> -----------------------------------
>
> Key: SYSTEMML-1238
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1238
> Project: SystemML
> Issue Type: Bug
> Components: Algorithms, APIs
> Affects Versions: SystemML 0.13
> Reporter: Imran Younus
> Assignee: Niketan Pansare
> Attachments: python_LinearReg_test_spark.1.6.log,
> python_LinearReg_test_spark.2.1.log
>
>
> [~deron] discovered that the one of the python test ({{test_mllearn_df.py}})
> with spark 2.1.0 was failing because the test score from linear regression
> was very low ({{~ 0.24}}). I did a some investigation and it turns out the
> the model parameters computed by the dml script are incorrect. In
> systemml.12, the values of betas from linear regression model are
> {{\[152.919, 938.237\]}}. This is what we expect from normal equation. (I
> also tested this with sklearn). But the values of betas from systemml.13
> (with spark 2.1.0) come out to be {{\[153.146, 458.489\]}}. These are not
> correct and therefore the test score is much lower than expected. The data
> going into DML script is correct. I printed out the valued of {{X}} and {{Y}}
> in dml and I didn't see any issue there.
> Attached are the log files for two different tests (systemml0.12 and 0.13)
> with explain flag.
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