Cognitive Foundry 3.3.2 Released
November 7th, 2011
Version 3.3.2 of the Cognitive Foundry is now available for download.
Release 3.3.2 (2011-11-07): * Common Core: * Added checkedAdd and checkedMultiply functions to MathUtil, providing a means for conducting Integer addition and multiplication with explicit checking for overflow and underflow, and throwing an ArithmeticException if they occur. Java fails silently in integer over(under)flow situations. * Added explicit integer overflow checks to DenseMatrix. The underlying MTJ library stores dense matrices as a single dimensional arrays of integers, which in Java are 32-bit. When creating a matrix with numRows rows and numColumns columns, if numRows * numColumns is more than 2^31 - 1, a silent integer overflow would occur, resulting in later ArrayIndexOutOfBoundsExceptions when attempting to access matrix elements that didn't get allocated. * Added new methods to DiagonalMatrix interface for multiplying diagonal matrices together and for inverting a DiagonalMatrix. * Optimized operations on diagonal matrices in DiagonalMatrixMTJ. * Added checks to norm method in AbstractVectorSpace and DefaultInfiniteVector for power set to NaN, throwing an ArithmeticException if encountered. * Learning Core: * Optimized matrix multiplies in LogisticRegression to avoid creating dense matrices unnecessarily and to reduce computation time using improved DiagonalMatrix interfaces. * Added regularization and explicit bias estimation to MultivariateLinearRegression. * Added ConvexReceiverOperatingCharacteristic, which computes the convex hull of the ROC. * Fixed rare corner-case bug in ReceiverOperatingCharacteristic and added optional trapezoidal AUC computation. * Cleaned up constant in MultivariateCumulativeDistributionFunction and added publication references.