Apache SystemML 0.9.0-incubating 发布

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　　Apache SystemML 0.9.0-incubating 发布了，SystemML 是灵活的，可伸缩机器学习 (ML) 语言，使用 Java 编写。机器学习 (ML) 是指无需显式的编程即可让计算机学习的能力。
　　该版本改进内容包括：
*APIs*
Improvements to MLContext and to MLPipeline wrappers
*Data Ingestion*
Data conversion utilities (from RDDs and DataFrames)
Data transformations on raw data sets
*Optimizations*
Extensions to compilation chain, including IPA
Improvements to parfor
Improved execution of concurrent Spark jobs
New rewrites, including eager RDD caching and repartitioning
Improvements to buffer pool caching
Partitioning-preserving operations
On-demand creation of SparkContext
Efficient use of RDD checkpointing
*Language and Runtime Operators*
New matrix multiplication operators (e.g., ZipMM)
New multi-threaded readers and operators
Extended aggregation-outer operations for different relational operators
Sample capability
*New Algorithms*
Alternating Least Squares (Conjugate Gradient)
Cubic Splines (Conjugate Gradient and Direct Solve)