117 lines
8.3 KiB
Plaintext
117 lines
8.3 KiB
Plaintext
The Apache Commons Math team is pleased to announce the commons-math3-3.6 release!
|
|
|
|
The Apache Commons Math project is a library of lightweight, self-contained mathematics
|
|
and statistics components addressing the most common practical problems not immediately
|
|
available in the Java programming language or commons-lang.
|
|
|
|
Changes in this version include:
|
|
|
|
New features:
|
|
o Added a RotationConvention enumerate to allow specifying the semantics
|
|
or axis/angle for rotations. This enumerate has two values:
|
|
VECTOR_OPERATOR and FRAME_TRANSFORM. Issue: MATH-1302,MATH-1303.
|
|
o Added a field-based version of Ordinary Differential Equations framework.
|
|
This allows integrating ode that refer to RealField elements instead of
|
|
primitive double, hence opening the way to use DerivativeStructure to
|
|
compute partial differential without using variational equations, or to solve
|
|
ode with extended precision using Dfp. Issue: MATH-1288.
|
|
o Added a nth order Brent solver for general real fields, replacing the former
|
|
solver that was restricted to Dfp fields only.
|
|
o New "Range" inner class of "o.a.c.m.util.IntegerSequence". Issue: MATH-1286.
|
|
o "AggregateSummaryStatistics" can now aggregate any kind of
|
|
"StatisticalSummary". Issue: MATH-837.
|
|
o Deep copy of "Network" (package "o.a.c.m.ml.neuralnet") to allow evaluation of
|
|
of intermediate states during training. Issue: MATH-1278.
|
|
o Added negative zero support in FastMath.pow. Issue: MATH-1273. Thanks to Qualtagh.
|
|
o Various SOFM visualizations (in package "o.a.c.m.ml.neuralnet.twod.util"):
|
|
Unified distance matrix, hit histogram, smoothed data histograms,
|
|
topographic error, quantization error. Issue: MATH-1270.
|
|
o New interfaces to be implemented by algorithms that visualizes properties
|
|
of a "NeuronSquareMesh2D" (package "o.a.c.m.ml.neuralnet.twod.util"). Issue: MATH-1268.
|
|
o Reimplemented pow(double, double) in FastMath, for better accuracy in
|
|
integral power cases and trying to fix erroneous JIT optimization again.
|
|
o Added a pow(double, long) method in FastMath.
|
|
o "NeuronSquareMesh2D" (package "o.a.c.m.ml.neuralnet.twod") implements "Iterable". Issue: MATH-1265.
|
|
o "MapUtils" (package "o.a.c.m.ml.neuralnet"): Method to sort units according to distance
|
|
from a given vector. Issue: MATH-1264.
|
|
o Accessor (class "o.a.c.m.ml.neuralnet.twod.NeuronSquareMesh2D"). Issue: MATH-1263.
|
|
o New "IntegerSequence" class (in package "o.a.c.m.util") with "Incrementor" inner class. Issue: MATH-1259.
|
|
o "Neuron" class (package "o.a.c.m.ml.neuralnet"): added methods that can be used
|
|
to assess concurrency performance. Issue: MATH-1250.
|
|
o Method "cosAngle" in "o.a.c.m.util.MathArrays". Issue: MATH-1244.
|
|
|
|
Fixed Bugs:
|
|
o Improved performance and accuracy of 2-sample KolmogorovSmirnov tests. Issue: MATH-1310.
|
|
o Detect start failures with multi-step ODE integrators. Issue: MATH-1297.
|
|
o Fixed stability issues with Adams-Bashforth and Adams-Moulton ODE integrators.
|
|
The integrators did not estimate the local error properly and were sometimes
|
|
stuck attempting to reduce indefinitely the step size as they thought the
|
|
error was too high. Thanks to Julien Queyrel.
|
|
o Increased default value for number of allowed evaluations in
|
|
"o.a.c.m.optim.univariate.BracketFinder". Issue: MATH-1295. Thanks to Luke Lindsay.
|
|
o Fixed potential race condition in PolynomialUtils#buildPolynomial in
|
|
case polynomials are generated from multiple threads. Furthermore, the
|
|
synchronization is now performed on the coefficient list instead of the class. Issue: MATH-1294. Thanks to Kamil Włodarczyk.
|
|
o Fixed FastMath.exp that potentially returned NaN for non-NaN argument. Issue: MATH-1269.
|
|
o Updated reference in ZipfDistribution's javadoc. Issue: MATH-1285. Thanks to Pim van der Hoorn.
|
|
o Fixed "Gamma#gamma(double)" for negative values smaller than -20. Issue: MATH-1283. Thanks to Jean Noel Delavalade.
|
|
o Fixed javadoc of methods {floorDiv,floorMod} in class "FastMath". Issue: MATH-1237. Thanks to Ken Williams.
|
|
o Check precondition (class "o.a.c.m.random.EmpiricalDistribution"). Issue: MATH-1279.
|
|
o Fixed incorrect Kendall's tau coefficient calculation due to internal integer overflow. Issue: MATH-1277. Thanks to Marc Rosen.
|
|
o Fixed split/side inconsistencies in BSP trees. Issue: MATH-1266.
|
|
o Avoid overflow in "Fraction" (multiplication or division by an int). Issue: MATH-1261. Thanks to Osamu Ikeuchi.
|
|
o Added check for equal array lengths to distance measure functions. Issue: MATH-1258. Thanks to Gunel Jahangirova.
|
|
o Better accuracy in computation of cumulative probability of "NormalDistribution"
|
|
(package "o.a.c.m.distribution"). Issue: MATH-1257. Thanks to Bill Murphy.
|
|
o Boundary check to construct an "Interval" (package "o.a.c.m.geometry.euclidean.oned"). Issue: MATH-1256.
|
|
o Wrong neighbourhood size in class "KohonenUpdateAction" (package "o.a.c.m.ml.neuralnet.sofm"). Issue: MATH-1255.
|
|
o ResizableDoubleArray constructor does not work with double array of size 1. Issue: MATH-1252. Thanks to John Bay.
|
|
o Fixed initial value of "number of calls" counter in class "KohonenUpdateAction"
|
|
(package "o.a.c.m.ml.neuralnet.sofm"). Issue: MATH-1251.
|
|
o Removed unnecessary allocations in "BigFraction" (package "o.a.c.m.fraction"). Issue: MATH-1248. Thanks to Chris Popp.
|
|
o Fixed error in computing discrete distribution of D statistics for small-sample
|
|
2-sample Kolmogorov-Smirnov tests. Error was causing incorrect p-values returned
|
|
by exactP and monteCarloP methods (used by default for small, mid-size samples). Issue: MATH-1245.
|
|
o "KolmogorovSmirnovTest#ksSum(...)" returned wrong result in case the provided
|
|
t-parameters was zero. This affected the calculation of "approximateP(...)" for
|
|
identical samples. Issue: MATH-1240.
|
|
o Improved performance to calculate the two-sample Kolmogorov-Smirnov test
|
|
via monte carlo simulation ("KolmogorovSmirnovTets#monteCarloP(...)"). Issue: MATH-1242. Thanks to Otmar Ertl.
|
|
o A "StackOverflowException" was thrown when passing Double.NaN or infinity
|
|
to "Gamma#digamma(double)" or "Gamma#trigamma(double)". Now the input value
|
|
is propagated to the output if it is not a real number. Issue: MATH-1241. Thanks to Aleksei Dievskii.
|
|
o Improved performance of calculating the two-sample Kolmogorov-Smirnov
|
|
test statistic. Issue: MATH-1232. Thanks to Otmar Ertl.
|
|
o Fixed error message for unknown parameter name in ODE. Issue: MATH-1232.
|
|
o Fixed wrong event detection in case of close events pairs. Issue: MATH-1226.
|
|
o Fix potential branching errors in "FastMath#pow(double, double)" when
|
|
passing special values, i.e. infinity, due to erroneous JIT optimization.
|
|
o Fixed equals/hashcode contract failure for Dfp. Issue: MATH-1118.
|
|
o Fixed wrong splitting of huge number in extended accuracy algorithms. Issue: MATH-1223.
|
|
o Improve performance of "BetaDistribution#sample()" by using Cheng's algorithm. Issue: MATH-1153. Thanks to Sergei Lebedev.
|
|
o Computation of 2-sample Kolmogorov-Smirnov statistic in case of ties
|
|
was not correct. Issue: MATH-1197.
|
|
|
|
Changes:
|
|
o Modified 2-sample KolmogorovSmirnovTest to handle ties in sample data. By default,
|
|
ties are broken by adding random jitter to input data. Also added bootstrap method
|
|
analogous to ks.boot in R Matching package. Issue: MATH-1246.
|
|
o Added bootstrap method to KolmogorovSmirnov test. Issue: MATH-1246.
|
|
o Added constructors taking sample data as arguments to enumerated real and integer distributions. Issue: MATH-1287.
|
|
o Improved performance of sampling and inverse cumulative probability calculation
|
|
for geometric distributions. Issue: MATH-1276.
|
|
o Representation of Kolmogorov-Smirnov statistic as integral value. Issue: MATH-1274.
|
|
o Faster generation of Zipf distributed random numbers by using rejection-inversion sampling. Issue: MATH-1220.
|
|
o Improved performance of sort-in-place methods by avoiding boxing. Issue: MATH-990.
|
|
o Refactored implementation of the "miscrosphere projection"
|
|
interpolation algorithm.
|
|
New classes: "MicrosphereProjectionInterpolator",
|
|
"InterpolatingMicrosphere" and "InterpolatingMicrosphere2D"
|
|
replace "MicrosphereInterpolator" and "MicrosphereInterpolatingFunction".
|
|
(package "o.a.c.m.analysis.interpolation"). Issue: MATH-1243.
|
|
|
|
|
|
Have fun!
|
|
-Apache Commons Math team
|
|
|