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Posted to issues@spark.apache.org by "Feynman Liang (JIRA)" <ji...@apache.org> on 2015/07/07 03:44:04 UTC

[jira] [Updated] (SPARK-8853) FPGrowth is not Java-Friendly

     [ https://issues.apache.org/jira/browse/SPARK-8853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Feynman Liang updated SPARK-8853:
---------------------------------
    Description: 
`FPGrowth[Item : ClassTag]` has a public constructor but uses a parameterized type with a context bound `ClassTag`, making it difficult to instantiate in Java.

For example, to instantiate one needs to do

```
ClassTag<String> tag = scala.reflect.ClassTag$.MODULE$.apply(String.class)

FPGrowthModel<String> model = new FPGrowthModel<String>(rdd, 35L, tag);
JavaRDD<AssociationRules.Rule<String>> results = (new AssociationRules()).runJava(model);
```

  was:
`FPGrowth[Item : ClassTag]` has a public constructor but uses a parameterized type with a context bound `ClassTag`, making it difficult to instantiate in Java.

For example, to instantiate one needs to do
```java
ClassTag<String> tag = scala.reflect.ClassTag$.MODULE$.apply(String.class)

FPGrowthModel<String> model = new FPGrowthModel<String>(rdd, 35L, tag);
JavaRDD<AssociationRules.Rule<String>> results = (new AssociationRules()).runJava(model);
```


> FPGrowth is not Java-Friendly
> -----------------------------
>
>                 Key: SPARK-8853
>                 URL: https://issues.apache.org/jira/browse/SPARK-8853
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Feynman Liang
>
> `FPGrowth[Item : ClassTag]` has a public constructor but uses a parameterized type with a context bound `ClassTag`, making it difficult to instantiate in Java.
> For example, to instantiate one needs to do
> ```
> ClassTag<String> tag = scala.reflect.ClassTag$.MODULE$.apply(String.class)
> FPGrowthModel<String> model = new FPGrowthModel<String>(rdd, 35L, tag);
> JavaRDD<AssociationRules.Rule<String>> results = (new AssociationRules()).runJava(model);
> ```



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