org.apache.mahout.math
Interfaces 
Matrix
Vector
Vector.Element
VectorIterable
Classes 
AbstractMatrix
AbstractVector
DenseMatrix
DenseVector
GenericPermuting
JsonMatrixAdapter
JsonVectorAdapter
MatrixSlice
MatrixView
OrthonormalityVerifier
Partitioning
RandomAccessSparseVector
SequentialAccessSparseVector
SparseColumnMatrix
SparseMatrix
SparseRowMatrix
Timer
VectorView
Exceptions 
CardinalityException
IndexException
UnboundLabelException