Collaboration diagram for Development of linear Abstract Numerical Algorithms (ANAs):While the Fundamental Thyra Operator/Vector Interfaces were not principally designed to provide a direct API for the development of ANA software, with some minimal helper functions and classes, directly writing even sophisticated ANA implementations directly in terms of Thyra objects is quite straightforward. More...
Modules | |
General ANA support code | |
Collection of all multi-vector operations | |
Miscellaneous C++ utility code for testing and debugging. | |
Collection of all vector operations | |
Classes | |
class | Thyra::DefaultAddedLinearOp< Scalar > |
Concrete composite LinearOpBase subclass that creates an implicitly added linear operator out of one or more constituent LinearOpBase objects. More... | |
class | Thyra::DefaultBlockedLinearOp< Scalar > |
Concrete composite LinearOpBase subclass that creates single linear operator object out of a set of constituent LinearOpBase blocks. More... | |
class | Thyra::DefaultDiagonalLinearOp< Scalar > |
Default concrete LinearOpBase subclass for diagonal linear operators. More... | |
class | Thyra::DefaultIdentityLinearOp< Scalar > |
Represents a identity linear operator M = I . More... | |
class | Thyra::DefaultMultipliedLinearOp< Scalar > |
Concrete composite LinearOpBase subclass that creates an implicitly multiplied linear operator out of one or more constituent LinearOpBase objects. More... | |
class | Thyra::DefaultMultiVectorProductVector< Scalar > |
Concrete implementation of a product vector which is really composed out of the columns of a multi-vector. More... | |
class | Thyra::DefaultMultiVectorProductVectorSpace< Scalar > |
Standard concrete implementation of a product vector space that creates product vectors fromed implicitly from the columns of a multi-vector. More... | |
class | Thyra::DefaultProductMultiVector< Scalar > |
Concrete implementation of a product multi-vector. More... | |
class | Thyra::DefaultProductVector< Scalar > |
Concrete implementation of a product vector. More... | |
class | Thyra::DefaultProductVectorSpace< Scalar > |
Standard concrete implementation of a product vector space. More... | |
class | Thyra::DefaultScaledAdjointLinearOp< Scalar > |
Concrete decorator LinearOpBase subclass that wraps a LinearOpBase object and adds on an extra scaling factor and/or a transpose enum. More... | |
class | Thyra::DefaultZeroLinearOp< Scalar > |
Represents a zero linear operator M = 0 . More... | |
class | Thyra::ConstDetachedMultiVectorView< Scalar > |
Create an explicit non-mutable (const) view of a MultiVectorBase object. More... | |
class | Thyra::DetachedMultiVectorView< Scalar > |
Create an explicit mutable (non-const) view of a MultiVectorBase object. More... | |
class | Thyra::ConstDetachedVectorView< Scalar > |
Create an explicit non-mutable (const) view of a VectorBase object. More... | |
class | Thyra::DetachedVectorView< Scalar > |
Create an explicit mutable (non-const) view of a VectorBase object. More... | |
class | Thyra::LinearOpDefaultBase< RangeScalar, DomainScalar > |
Node subclass that provides a good default implementation for the describe() function. More... | |
class | Thyra::ConstLinearOperator< RangeScalar, DomainScalar > |
class | Thyra::LinearOperator< RangeScalar, DomainScalar > |
class | Thyra::LinearOpTester< RangeScalar, DomainScalar > |
Testing class for LinearOpBase . More... | |
class | Thyra::ListedMultiVectorRandomizer< Scalar > |
MultiVectorRandomizerBase subclass that returns a revolving list of preset MultiVectorBase objects. More... | |
class | Thyra::MultiVectorDefaultBase< Scalar > |
Node subclass that uses a default MultiVectorBase implementation to provide default implementations for as many other functions in MultiVectorBase interface the as is reasonable. More... | |
class | Thyra::MultiVectorTester< Scalar > |
Unit testing class for a MultiVectorBase object. More... | |
class | Thyra::ParameterDrivenMultiVectorInput< Scalar > |
Concrete utility class that an ANA can use for reading in a (multi)vector as directed by a parameter sublist. More... | |
class | Thyra::SingleRhsLinearOpBase< Scalar > |
Base class for linear operators that can only implement a single RHS vector apply operation and only support one scalar type. More... | |
class | Thyra::SingleScalarLinearOpBase< Scalar > |
Base class for linear operators that can only handle a single scalar type. More... | |
class | Thyra::UniversalMultiVectorRandomizer< Scalar > |
Univeral MultiVectorRandomizerBase subclass that is compatible with all MultiVectorBase objects. More... | |
class | Thyra::Converter< Scalar, TargetType > |
Converter that defines the interface for objects that can be converted to vectors. More... | |
class | Thyra::ConstVector< Scalar > |
Read-only handle class for wrapping Thyra::VectorBase objects and allowing for operator-overloading linear algebra. More... | |
class | Thyra::Vector< Scalar > |
Read-write handle class for wrapping Thyra::VectorBase objects and allowing for operator-overloading linear algebra. More... | |
class | Thyra::VectorDefaultBase< Scalar > |
Convenient node subclass for concrete VectorBase subclasses that relies on a default MultiVectorBase implementation. More... | |
class | Thyra::VectorSpace< Scalar > |
Handle class for VectorSpaceBase . More... | |
class | Thyra::VectorSpaceDefaultBase< Scalar > |
Node VectorSpaceBase subclass that provides default implementations for many functions using a default multi-vectors implementation. More... | |
class | Thyra::VectorSpaceTester< Scalar > |
Testing class for VectorSpace and the VectorBase and MultiVectorBase objects that it creates. More... | |
class | Thyra::VectorTester< Scalar > |
Unit testing class for a VectorBase object. More... | |
Enumerations | |
enum | Thyra::LCSign |
LCSign is used to indicate whether a linear combination object represents addition or subtraction. More... |
It turns out that using Thyra for the development of simple ANAs, as described below, really does not require any deep understanding of the foundational Thyra operator/vector interfaces.
The following Java-like handle classes wrap Thyra base objects and define the basic linear algebra operations:
Thyra::VectorSpace
wraps Thyra::VectorSpaceBase
objects.
Thyra::Vector
wraps Thyra::VectorBase
objects and allows developers to write linear algebra experessions like y = alpha*x + z
. The class Thyra::ConstVector
is a base class of Thyra::Vector
that allows for the compile checking of const
protection.
Thyra::LinearOperator
wraps Thyra::LinearOpBase
objects and allows developers to write linear algebra experessions like D = alpha*A + adjoint(B) * C
. Unlike vectors, however, explicit objects are not formed in these types of operations and instead the implicit operators defined below. The class Thyra::ConstLinearOperator
is a base class of Thyra::LinearOperator
that allows for the compile checking of const
protection.
Hande clases have the same basic semantics as Thyra::RCP
for copy construction and assignment and infact they all use Thyra::RCP
internally to point to the underlying Thyra base objects. For an example of their use, see the function sillierCgSolve()
which calls silliestCgSolve()
.
While the use of the RTOpPack::RTOpT
interface class and the single Thyra::VectorBase::applyOp()
function provide an elegant and efficient solution for the interoperability of vector interfaces, it is not the easiest API for developing ANAs. However, a number of easy to use C++ wrapper functions for many different vector and multi-vector operations is already provided:
These C++ wrapper functions rely on pre-implemented RTOpPack::RTOpT
subclasses. Adding new RTOpPack::RTOpT
subclasses and new wrapper functions for new vector and multi-vector reduction/transformation operations is an easy matter for an experienced C++ developer who understands RTOpPack::RTOpT
(please contact rabartl@sandia.gov if you need a new vector or multi-vector operation that is not already supported).
One of the big advantages of having a set of abstract interfaces to operators and vectors is that it is quite easy to define some very useful aggregate subclasses that allow one or more individual objects be treated as a single object (see the "Composite" and "Decorator" design patterns in the GoF's "Design Patterns" book).
One particularly useful category of composite linear algebra objects is the product vector space where , for , are different constituent vector spaces. Product vector spaces give rise to product vectors
(where ) and product multi-vectors
(where and is the domain space for the multi-vectors).
Very general concrete implementations of the product vector space, vector and multi-vector interfaces described here are provided and are shown below:
Thyra::DefaultProductVectorSpace
is a general concrete implementation of Thyra::ProductVectorSpaceBase
that should be sufficient for most use cases. Thyra::DefaultProductVector
is a general concrete implementation of Thyra::ProductVectorBase
that should be sufficient for most use cases. Thyra::DefaultProductMultiVector
is a general concrete implementation of Thyra::ProductMultiVectorBase
that should be sufficient for most use cases. (ToDo: This needs to be implemented!) Note that the above concrete subclasses are very efficient for must, but not all, possible use cases for such composite objects.
When using product vector spaces, product vectors and product multi-vectors it is generally the case where a concrete Thyra::DefaultProductVectorSpace
object is first created and then Thyra::DefaultProductVector
and Thyra::DefaultProductMultiVector
objects are created by the functions Thyra::DefaultProductVectorSpace::createMember()
and Thyra::DefaultProductVectorSpace::createMembers()
. See this example of how product vector spaces are used.
These are several different types of useful implicit composite/decorator Thyra::LinearOpBase
subclasses. These concrete subclasses provide the building blocks for arbitararly complex implicitly composed linear operators. Default implementations for these implicit linear operator subclasses are shown below:
Thyra::DefaultZeroLinearOp
is used to define a zero linear operator of the form:
defined in terms of two vector spaces (a range and a domain).
Thyra::DefaultIdentityLinearOp
is used to define an identity linear operator of the form:
defined in terms of a single vector space.
Thyra::DefaultDiagonalLinearOp
is a simple concrete subclass that defines a diagonal linear operator
out of any Thyra::VectorBase
object for the diagonal .
Thyra::DefaultScaledAdjointLinearOp
is a simple concrete decorator subclass that defines an implicit scaled and/or adjoined (or transposed) linear operator.
Thyra::DefaultAddedLinearOp
is a simple concrete composite subclass that represent the implicit addition of two or more constituent Thyra::LinearOpBase
objects of the form
composed out of one or more constituent linear operators .
Thyra::DefaultMultipliedLinearOp
is a simple concrete composite subclass that defines a composite multiplicative Thyra::LinearOpBase
of the form
composed out of one or more constituent linear operators .
Thyra::DefaultBlockedLinearOp
is a simple concrete composite subclass that defines a composite blocking of Thyra::LinearOpBase
objects of the form
composed out of one or more constituent linear operators.
Warning! using the utility classes below it is very easy to obtain direct access to vector and multi-vector elements but in general, this is a very bad idea. However, as described in this report, there are some types of ANAs that require direct element access to certain kinds of vectors and multi-vectors (for example, vectors and multi-vectors that lie is the domain space of a multi-vector). The following utility classes streamline creating and using explicit views.
Thyra::ConstDetachedVectorView
creates a (const
) non-mutable explicit view of a const Thyra::VectorBase
object, allows direct access to vector elements and then frees the view in the destructor. Thyra::DetachedVectorView
creates a (non-const
) mutable explicit view of a Thyra::VectorBase
object, allows direct access to vector elements and then frees the view in the destructor. Thyra::ConstDetachedMultiVectorView
creates a (const
) non-mutable explicit view of a const Thyra::MultiVectorBase
object, allows direct access to multi-vector elements and then frees the view in the destructor. Thyra::DetachedMultiVectorView
creates a (non-const
) mutable explicit view of a Thyra::MultiVectorBase
object, allows direct access to multi-vector elements and then frees the view in the destructor. One of the big advantages of using the above utility classes in addition to their convenience is that views are freed in destructors and these view will be freed even in the event that an exception is thrown. The use of these view classes is quite straightforward.
The following subclasses directly derive from Fundamental Thyra Operator/Vector Interfaces and provide general default implementations for as many virtual functions as reasonable:
Thyra::VectorSpaceDefaultBase
should be a direct or indirect base class of almost every concrete Thyra::VectorSpaceBase
adapter subclass. This node subclass provides the default implementation Thyra::VectorSpaceDefaultBase::createMembers()
using the Thyra::DefaultColumnwiseMultiVector
subclass. Therefore, a subclass need only provide a VectorBase
implementation and override the Thyra::VectorSpaceBase::createMember()
and related functions.
Thyra::LinearOpDefaultBase
should be a direct or indirect base class of almost every concrete Thyra::MultiVectorBase
adpater subclass. This node subclass provides just the default implementation override Thyra::LinearOpDefaultBase::describe()
Thyra::SingleScalarLinearOpBase
provides a node subclass for all linear operators that can only handle a single scalar type for both the range and domain spaces.
Thyra::SingleRhsLinearOpBase
provides a node subclass for all linear operators that can only handle a single scalar type for both the range and domain spaces and only single vector arguments for Thyra::SingleRhsLinearOpBase::apply()
.
Thyra::MultiVectorDefaultBase
should be a direct or indirect base class of almost every concrete Thyra::MultiVectorBase
adpater subclass. This node subclass provides a default of every inherited virtual function from the base class Thyra::MultiVectorBase
in terms of just Thyra::MultiVectorBase::col()
. While many of these default function implementations are highly non-optimal, however, they allow for rapid prototyping of new Thyra::MultiVectorBase
subclasses.
Thyra::VectorDefaultBase
should be a direct or indirect base class of almost every concrete Thyra::VectorBase
adpater subclass. This node subclass provides full general and efficient implementations of all of the inherited virtual functions from the base class Thyra::MultiVectorBase
.
This is basic testing software for Thyra:
Thyra::LinearOpTester
is a unit testing class that validates the implementation of a Thyra::LinearOpBase
object by checking its linear properties, and/or its adjoint, and/or symmetry. In addition, it can check if two linear operators are the same. Thyra::MultiVectorTester
is a unit testing class that validates the implementation of a Thyra::MultiVectorBase
object. This class exposes a Thyra::LinearOpTester
object for testing the LinearOpBase
base interface of Thyra::MultiVectorBase
. Thyra::VectorTester
is a unit testing class that validates the implementation of a Thyra::VectorBase
object. This class exposes a Thyra::MultiVectorTester
object for testing the MultiVectorBase
base interface of Thyra::VectorBase
. Thyra::VectorSpaceTester
is a unit testing class that accepts any Thyra::VectorSpaceBase
object and then proceeds to create a number of Thyra::VectorBase
and Thyra::MultiVectorBase
objects and then and validates all of these objects. This class class, therefore, is a unit testing class for all three interfaces ThyraVectorSpaceBase
, ThyraVectorBase
, and Thyra::MultiVectorBase
. Thyra::VectorStdOpsTester
is a unit testing class that accepts any Thyra::VectorSpaceBase
object and then tests all of the standard vector RTOp wrappers documented here. Thyra::MultiVectorStdOpsTester
is a unit testing class that accepts any Thyra::VectorSpaceBase
object and then tests all of the standard multi-vector RTOp wrappers documented here.
There is software included in the Thyra package to support basic testing and debugging.
First, 100/% general output stream operators for any Thyra::VectorBase
or Thyra::LinearOpBase
object are provided in the following operator functions:
Thyra::operator<<(std::ostream& o, const Thyra::VectorBase<Scalar>& v)
is an output stream operator for printing Thyra::VectorBase
objects. Thyra::operator<<(std::ostream& o, const Thyra::LinearOpBase<Scalar>& M)
is an output stream operator for printing Thyra::LinearOpBase
(and therefore also Thyra::MultiVectorBase
) objects.
Here is software that does not neatly fall into any of the above categories but is still considered ANA software.
Thyra::ParameterDrivenMultiVectorInput
is a simple concrete utility class that derives from Teuchos::ParameterListAcceptor
that defines a parameter sublist that specifies how to read (multi)vectors for a file(s) or directly from the parameter list.
sillyPowerMethod()
is a simple example ANA that implements the power method for estimating the dominate eigenvalue of a linear operator.
sillyCgSolve()
is a simple example ANA that implements the conjugate gradient method for solving a symmetric positive definite linear system.
sillierCgSolve()
calls the function silliestCgSolve()
to implement CG using handle classes.
silliestCgSolve()
is a simple example ANA that also implements the conjugate gradient method for solving a symmetric positive definite linear system but it uses the handle layer with operator overloading.
Thyra::LinearOpTester::check()
shows how to access a Thyra::LinearOpBase
objects domain and range spaces, how to use these spaces to create vectors and multi-vectors and how to perform various types of operations involving vectors, multi-vectors and linear operators.
enum Thyra::LCSign |
LCSign is used to indicate whether a linear combination object represents addition or subtraction.
Definition at line 57 of file Thyra_VectorDecl.hpp.