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https://issues.apache.org/jira/browse/SPARK-20114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15944239#comment-15944239
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yuhao yang edited comment on SPARK-20114 at 3/27/17 11:42 PM:
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Currently I prefer to implement the dummy PrefixSpanModel as the sequential
rules extracted won't be quite useful. And if needed, we can implement other
algorithms to extract sequential rules for prediction.
was (Author: yuhaoyan):
Currently I prefer to implement the dummy PrefixSpanModel as the sequential
rules extracted won't be quite useful.
> spark.ml parity for sequential pattern mining - PrefixSpan
> ----------------------------------------------------------
>
> Key: SPARK-20114
> URL: https://issues.apache.org/jira/browse/SPARK-20114
> Project: Spark
> Issue Type: New Feature
> Components: ML
> Affects Versions: 2.2.0
> Reporter: yuhao yang
>
> Creating this jira to track the feature parity for PrefixSpan and sequential
> pattern mining in Spark ml with DataFrame API.
> First list a few design issues to be discussed, then subtasks like Scala,
> Python and R API will be created.
> # Wrapping the MLlib PrefixSpan and provide a generic fit() should be
> straightforward. Yet PrefixSpan only extracts frequent sequential patterns,
> which is not good to be used directly for predicting on new records. Please
> read
> http://data-mining.philippe-fournier-viger.com/introduction-to-sequential-rule-mining/
> for some background knowledge. Thanks Philippe Fournier-Viger for providing
> insights. If we want to keep using the Estimator/Transformer pattern, options
> are:
> #* Implement a dummy transform for PrefixSpanModel, which will not add
> new column to the input DataSet. The PrefixSpanModel is only used to provide
> access for frequent sequential patterns.
> #* Adding the feature to extract sequential rules from sequential
> patterns. Then use the sequential rules in the transform as FPGrowthModel.
> The rules extracted are of the form X–> Y where X and Y are sequential
> patterns. But in practice, these rules are not very good as they are too
> precise and thus not noise tolerant.
> # Different from association rules and frequent itemsets, sequential rules
> can be extracted from the original dataset more efficiently using algorithms
> like RuleGrowth, ERMiner. The rules are X–> Y where X is unordered and Y is
> unordered, but X must appear before Y, which is more general and can work
> better in practice for prediction.
> I'd like to hear more from the users to see which kind of Sequential rules
> are more practical.
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