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oj! Algorithms v51.3.0 Release Notes

Release Date: 2022-05-15 // almost 2 years ago

  • ➕ Added

    org.ojalgo.data

    • 🆕 New batch processising tool BatchNode to do processing of huge data sets on a single machine.

    org.ojalgo.netio

    • 🆕 New interfaces FromFileReader and ToFileWriter paired with a wide range of implementations, builders, parsers, interpreters... There is also a new class ShardedFile that describes a set of shards and allow creations of readers and writers of the total set of files.

    org.ojalgo.structure

    • Access1D, Access2D and AccessAnyD each gained additional features to select (view) subsets of the elements and/or to iterate over elements/rows/columns/vectors/matruces...

    org.ojalgo.type

    • 🆕 New utilities CloseableList and CloseableMap to simplify handing (closing) multiple readers/writers.
    • 🏗 Whole new package, org.ojalgo.type.function, with lots of utlities for consumers/suppliers (or readers/writers). A lot of the new stuff in org.ojalgo.netio build on this.
    • ➕ Additions to EntryPair. Primarily to allow creation of key-value "pairs" with dual keys.

    🔄 Changed

    org.ojalgo.concurrent

    • 👍 The ParallelismSupplier interface had the min and max methods renamed limit and require to better dscribe what they do.
    • 🔨 Refactoring and additions to ProcessingService.

    org.ojalgo.netio

    • 📜 Reimplemented the IDX file parser in terms of DataInterpreter and DataReader.
    • 🔨 Refactored the BasicParser interface to make use of the new FromFileReader and ToFileWriter.
    • 🔨 Refactored BasicLogger and everything associated with it. There are API-breaking changes, but with stuff mostly used internally.

    org.ojalgo.optimisation

    • 🗄 The default value of the (MIP) gap property in IntegerStrategy changed from NumberContext.of(6,8) to NumberContext.of(7,8). This is to match what the recently deprecated mip_gap option used to be. The default MIP gap used to 1E-6, and that corresponfs to 7 digits precision (not 6).

    org.ojalgo.random

    • 🔨 Refactoring and additions to FrequencyMap.

    org.ojalgo.structure

    • 🔨 The various row, rows, column and columns methods in Structure2D.Logical have been signature-refactored to be more logical. If you used the row or column alternatives to reference more than 1 row/column you need to change your code to instead use rows or columns.
    • 👍 The previously existing Access2D.RowView, Access2D.ColumnView, AccessAnyD.VectorView and AccessAnyD.MatrixView gained support to "goTo" directly to a specified row/column/vector/matrix

    🗄 Deprecated

    org.ojalgo.netio

    • 🚚 A bunch of old useless stuff... will be removed eventually.

    🛠 Fixed

    org.ojalgo.matrix

    • Calling indexOfLargest() on a Primitive64Store, Primitive32Store or GenericStore would result in a StackOverflowError.

    org.ojalgo.optimisation

    • There was a problem with integer rounding of lower/upper bounds of integer expressions - since it was applied too late the presolver would sometimes fail to detect infeasible nodes as such, and instead generate an incorrect problem for the main solver. This was not a very common problem, but did happen sometimes, and the fix made the presolver generally more efficient.