Joseph K. Bradley created SPARK-12626:
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Summary: MLlib 2.0 Roadmap
Key: SPARK-12626
URL: https://issues.apache.org/jira/browse/SPARK-12626
Project: Spark
Issue Type: Umbrella
Components: ML, MLlib
Reporter: Joseph K. Bradley
Assignee: Xiangrui Meng
Priority: Blocker
This is a master list for MLlib improvements we plan to have in Spark 2.0.
Please view this list as a wish list rather than a concrete plan, because we
don't have an accurate estimate of available resources. Due to limited review
bandwidth, features appearing on this list will get higher priority during code
review. But feel free to suggest new items to the list in comments. We are
experimenting with this process. Your feedback would be greatly appreciated.
h1. Instructions
h2. For contributors:
* Please read
https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark
carefully. Code style, documentation, and unit tests are important.
* If you are a first-time Spark contributor, please always start with a
[starter task|https://issues.apache.org/jira/issues/?filter=12333209] rather
than a medium/big feature. Based on our experience, mixing the development
process with a big feature usually causes long delay in code review.
* Never work silently. Let everyone know on the corresponding JIRA page when
you start working on some features. This is to avoid duplicate work. For small
features, you don't need to wait to get JIRA assigned.
* For medium/big features or features with dependencies, please get assigned
first before coding and keep the ETA updated on the JIRA. If there exist no
activity on the JIRA page for a certain amount of time, the JIRA should be
released for other contributors.
* Do not claim multiple (>3) JIRAs at the same time. Try to finish them one
after another.
* Remember to add the `@Since("2.0.0")` annotation to new public APIs.
* Please review others' PRs (https://spark-prs.appspot.com/#mllib). Code review
greatly helps to improve others' code as well as yours.
h2. For committers:
* Try to break down big features into small and specific JIRA tasks and link
them properly.
* Add a "starter" label to starter tasks.
* Put a rough estimate for medium/big features and track the progress.
* If you start reviewing a PR, please add yourself to the Shepherd field on
JIRA.
* If the code looks good to you, please comment "LGTM". For non-trivial PRs,
please ping a maintainer to make a final pass.
* After merging a PR, create and link JIRAs for Python, example code, and
documentation if applicable.
h1. Roadmap (*WIP*)
This is NOT [a complete list of MLlib JIRAs for
2.0|https://issues.apache.org/jira/issues/?filter=12334385]. We only include
umbrella JIRAs and high-level tasks.
Major efforts in this release:
* `spark.ml`: Achieve feature parity for the `spark.ml` API, relative to the
`spark.mllib` API. This includes the Python API.
* Linear algebra: Separate out the linear algebra library as a standalone
project without a Spark dependency to simplify production deployment.
* Pipelines API: Complete critical improvements to the Pipelines API
* New features: As usual, we expect to expand the feature set of MLlib.
However, we will prioritize API parity over new features. _New algorithms
should be written for `spark.ml`, not `spark.mllib`._
h2. Algorithms and performance
* iteratively re-weighted least squares (IRLS) for GLMs (SPARK-9835)
* extended support for GLM model families and link functions (SPARK-12566)
* improved model summaries and stats (SPARK-7674)
Additional (maybe lower priority):
* robust linear regression with Huber loss (SPARK-3181)
* vector-free L-BFGS (SPARK-10078)
* tree partition by features (SPARK-3717)
* local linear algebra (SPARK-6442)
* weighted instance support (SPARK-9610)
** random forest (SPARK-9478)
* locality sensitive hashing (LSH) (SPARK-5992)
* deep learning (SPARK-5575)
** autoencoder (SPARK-10408)
** restricted Boltzmann machine (RBM) (SPARK-4251)
** convolutional neural network (stretch)
* factorization machine (SPARK-7008)
* distributed LU decomposition (SPARK-8514)
h2. Statistics
* bivariate statistics as UDAFs (SPARK-10385)
* R-like statistics for GLMs (SPARK-9835)
h2. Pipeline API
* pipeline persistence (SPARK-6725)
* ML attribute API improvements (SPARK-8515)
* predict single instance (SPARK-10413)
* test Kaggle datasets (SPARK-9941)
_There may be other design improvement efforts for Pipelines, to be listed here
soon. See (SPARK-5874) for a list of possibilities._
h2. Model persistence
* PMML export
** naive Bayes (SPARK-8546)
** decision tree (SPARK-8542)
* model save/load
** FPGrowth (SPARK-6724)
** PrefixSpan (SPARK-10386)
* code generation
** decision tree and tree ensembles (SPARK-10387)
h2. Data sources
* public dataset loader (SPARK-10388)
h2. Python API for ML
The main goal of Python API is to have feature parity with Scala/Java API. You
can find a complete list
[here|https://issues.apache.org/jira/issues/?filter=12333214]. The tasks fall
into two major categories:
* Python API for new algorithms
* Python API for missing methods
h2. SparkR API for ML
* support more families and link functions in SparkR::glm (SPARK-12566)
* model summary with R-like statistics for GLMs (SPARK-9837)
* support more algorithms (K-Means, survival analysis, etc.)
h2. Documentation
* re-organize user guide (SPARK-8517)
* @Since versions in spark.ml, pyspark.mllib, and pyspark.ml (SPARK-7751)
* automatically test example code in user guide (SPARK-7924)
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