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Halide::Internal::AbstractGenerator Class Referenceabstract

AbstractGenerator is an ABC that defines the API a Generator must provide to work with the existing Generator infrastructure (GenGen, RunGen, execute_generator(), Generator Stubs). More...

`#include <AbstractGenerator.h>`

Inheritance diagram for Halide::Internal::AbstractGenerator:

## Classes

struct | ArgInfo
| ArgInfo is a struct to contain name-and-type information for the inputs and outputs to the Pipeline that build_pipeline() will return. More...

## Public Member Functions

virtual | ~AbstractGenerator ()=default
virtual std::string | name ()=0
| Return the name of this Generator.
virtual GeneratorContext | context () const =0
| Return the Target and autoscheduler info that this Generator was created with.
virtual std::vector< ArgInfo > | arginfos ()=0
| Return a list of all the ArgInfos for this generator.
virtual void | set_generatorparam_value (const std::string &name, const std::string &value)=0
| Set the value for a specific GeneratorParam for an AbstractGenerator instance.
virtual void | set_generatorparam_value (const std::string &name, const LoopLevel &loop_level)=0
virtual Pipeline | build_pipeline ()=0
| Build and return the Pipeline for this AbstractGenerator.
virtual std::vector< Parameter > | input_parameter (const std::string &name)=0
| Given the name of an input, return the Parameter(s) for that input.
virtual std::vector< Func > | output_func (const std::string &name)=0
| Given the name of an output, return the Func(s) for that output.
virtual void | bind_input (const std::string &name, const std::vector< Parameter > &v)=0
| Rebind a specified Input to refer to the given piece of IR, replacing the default ImageParam / Param in place for that Input.
virtual void | bind_input (const std::string &name, const std::vector< Func > &v)=0
virtual void | bind_input (const std::string &name, const std::vector< Expr > &v)=0
virtual bool | emit_cpp_stub (const std::string &stub_file_path)=0
| Emit a Generator Stub (.stub.h) file to the given path.
virtual bool | emit_hlpipe (const std::string &hlpipe_file_path)=0
| Emit a Serialized Halide Pipeline (.hlpipe) file to the given path.
virtual bool | allow_out_of_order_inputs_and_outputs () const =0
| By default, a Generator must declare all Inputs before all Outputs.
Module | build_module (const std::string &function_name="")
| Call generate() and produce a Module for the result.
Module | build_gradient_module (const std::string &function_name)
| Build a module that is suitable for using for gradient descent calculation in TensorFlow or PyTorch.
Callable | compile_to_callable (const JITHandlers *jit_handlers=nullptr, const std::map< std::string, JITExtern > *jit_externs=nullptr)
| JIT the AbstractGenerator into a Callable (using the currently-set Target) and return it.
void | set_generatorparam_values (const GeneratorParamsMap &m)

## Detailed Description

AbstractGenerator is an ABC that defines the API a Generator must provide to work with the existing Generator infrastructure (GenGen, RunGen, execute_generator(), Generator Stubs).

The existing Generator<>-based instances all implement this API, but any other code that implements this (and uses RegisterGenerator to register itself) should be indistinguishable from a user perspective.

An AbstractGenerator is meant to be "single-use"; typically lifetimes will be something like:

- create an instance (with a specific Target)
- optionally set GeneratorParam values
- optionally re-bind inputs (if using in JIT or Stub modes)
- call build_pipeline()
- optionally call output_func() to get the output(s) (if using in JIT or Stub modes)
- discard the instance

AbstractGenerators should be fairly cheap to instantiate! Don't try to re-use one by re-setting inputs and calling build_pipeline() multiple times.

Note that an AbstractGenerator instance is (generally) stateful in terms of the order that methods should be called; calling the methods out of order may cause assert-fails or other undesirable behavior. Read the method notes carefully!

Definition at line 56 of file AbstractGenerator.h.

## Constructor & Destructor Documentation

## ~AbstractGenerator()

virtual Halide::Internal::AbstractGenerator::~AbstractGenerator | ( |  | ) |

virtual default

## Member Function Documentation

## name()

virtual std::string Halide::Internal::AbstractGenerator::name | ( |  | ) |

pure virtual

Return the name of this Generator.

(This should always be the name used to register it.)

Implemented in Halide::Internal::GeneratorBase.

Referenced by bind_input(), bind_input(), bind_input(), input_parameter(), output_func(), set_generatorparam_value(), and set_generatorparam_value().

## context()

virtual GeneratorContext Halide::Internal::AbstractGenerator::context | ( |  | ) | const

pure virtual

Return the Target and autoscheduler info that this Generator was created with.

Always legal to call on any AbstractGenerator instance, regardless of what other methods have been called. (All AbstractGenerator instances are expected to be created with immutable values for these, which can't be changed for a given instance after creation. Note that Generator<> based subclasses can customize Target somewhat via init_from_context(); see Generator.h for more info.)

CALL-AFTER: any CALL-BEFORE: any

Implemented in Halide::Internal::GeneratorBase.

## arginfos()

virtual std::vector< ArgInfo > Halide::Internal::AbstractGenerator::arginfos | ( |  | ) |

pure virtual

Return a list of all the ArgInfos for this generator.

The list will be in the order that the input and outputs are declared (possibly interleaved). Any inputs or outputs added by a configure() method will be in the list, at the end, in the order added. All input and output names will be unique within a given Generator instance.

CALL-AFTER: configure() CALL-BEFORE: any

Implemented in Halide::Internal::GeneratorBase.

## set_generatorparam_value() [1/2]

virtual void Halide::Internal::AbstractGenerator::set_generatorparam_value | ( | const std::string & | name,
|  | const std::string & | value )

pure virtual

Set the value for a specific GeneratorParam for an AbstractGenerator instance.

Names that aren't known generator names should assert-fail.

Values that can't be parsed for the specific GeneratorParam (e.g. passing "foo" where an integer is expected) should assert-fail at some point (either immediately, or when build_pipeline() is called)

This can be called multiple times, but only prior to build_pipeline().

CALL-AFTER: none CALL-BEFORE: build_pipeline

Implemented in Halide::Internal::GeneratorBase.

References name().

## set_generatorparam_value() [2/2]

virtual void Halide::Internal::AbstractGenerator::set_generatorparam_value | ( | const std::string & | name,
|  | const LoopLevel & | loop_level )

pure virtual

Implemented in Halide::Internal::GeneratorBase.

References name().

## build_pipeline()

virtual Pipeline Halide::Internal::AbstractGenerator::build_pipeline | ( |  | ) |

pure virtual

Build and return the Pipeline for this AbstractGenerator.

This method should be called only once per instance.

CALL-AFTER: set_generatorparam_value, bind_input CALL-BEFORE: input_parameter, output_func, external_code_map

Implemented in Halide::Generator< T >.

## input_parameter()

virtual std::vector< Parameter > Halide::Internal::AbstractGenerator::input_parameter | ( | const std::string & | name | ) |

pure virtual

Given the name of an input, return the Parameter(s) for that input.

(Most inputs will have exactly one, but inputs that are declared as arrays will have multiple.)

CALL-AFTER: build_pipeline CALL-BEFORE: none

Implemented in Halide::Internal::GeneratorBase.

References name().

## output_func()

virtual std::vector< Func > Halide::Internal::AbstractGenerator::output_func | ( | const std::string & | name | ) |

pure virtual

Given the name of an output, return the Func(s) for that output.

Most outputs will have exactly one, but outputs that are declared as arrays will have multiple.

Note that outputs with Tuple values are still just a single Func, though they do get realized as multiple Buffers.

Must be called after build_pipeline(), since the output Funcs will be undefined prior to that.

CALL-AFTER: build_pipeline() CALL-BEFORE: none

Implemented in Halide::Internal::GeneratorBase.

References name().

## bind_input() [1/3]

virtual void Halide::Internal::AbstractGenerator::bind_input | ( | const std::string & | name,
|  | const std::vector< Parameter > & | v )

pure virtual

Rebind a specified Input to refer to the given piece of IR, replacing the default ImageParam / Param in place for that Input.

Basic type-checking is done to ensure that inputs are still sane (e.g. types, dimensions, etc must match expectations).

CALL-AFTER: set_generatorparam_value CALL-BEFORE: build_pipeline

Implemented in Halide::Internal::GeneratorBase.

References name().

## bind_input() [2/3]

virtual void Halide::Internal::AbstractGenerator::bind_input | ( | const std::string & | name,
|  | const std::vector< Func > & | v )

pure virtual

Implemented in Halide::Internal::GeneratorBase.

References name().

## bind_input() [3/3]

virtual void Halide::Internal::AbstractGenerator::bind_input | ( | const std::string & | name,
|  | const std::vector< Expr > & | v )

pure virtual

Implemented in Halide::Internal::GeneratorBase.

References name().

## emit_cpp_stub()

virtual bool Halide::Internal::AbstractGenerator::emit_cpp_stub | ( | const std::string & | stub_file_path | ) |

pure virtual

Emit a Generator Stub (.stub.h) file to the given path.

Not all Generators support this.

If you call this method, you should not call any other AbstractGenerator methods on this instance, before or after this call.

If the Generator is capable of emitting a Stub, do so and return true. (Errors during stub emission should assert-fail rather than returning false.)

If the Generator is not capable of emitting a Stub, do nothing and return false.

CALL-AFTER: none CALL-BEFORE: none

Implemented in Halide::Internal::GeneratorBase.

## emit_hlpipe()

virtual bool Halide::Internal::AbstractGenerator::emit_hlpipe | ( | const std::string & | hlpipe_file_path | ) |

pure virtual

Emit a Serialized Halide Pipeline (.hlpipe) file to the given path.

Not all Generators support this.

If you call this method, you should not call any other AbstractGenerator methods on this instance, before or after this call.

If the Generator is capable of emitting an hlpipe, do so and return true. (Errors during hlpipe emission should assert-fail rather than returning false.)

If the Generator is not capable of emitting an hlpipe, do nothing and return false.

CALL-AFTER: none CALL-BEFORE: none

Implemented in Halide::Internal::GeneratorBase.

## allow_out_of_order_inputs_and_outputs()

virtual bool Halide::Internal::AbstractGenerator::allow_out_of_order_inputs_and_outputs | ( |  | ) | const

pure virtual

By default, a Generator must declare all Inputs before all Outputs.

In some unusual situations (e.g. metaprogramming situations), it's desirable to allow them to be declared out-of-order and put the onus of a non-obvious call order on the coder; a Generator may override this to return 'true' to allow this behavior.

Implemented in Halide::Internal::GeneratorBase.

## build_module()

Module Halide::Internal::AbstractGenerator::build_module | ( | const std::string & | function_name = "" | ) |

Call generate() and produce a Module for the result.

If function_name is empty, generator_name() will be used for the function.

## build_gradient_module()

Module Halide::Internal::AbstractGenerator::build_gradient_module | ( | const std::string & | function_name | ) |

Build a module that is suitable for using for gradient descent calculation in TensorFlow or PyTorch.

Essentially:

- A new Pipeline is synthesized from the current Generator (according to the rules below)
- The new Pipeline is autoscheduled (if autoscheduling is requested, but it would be odd not to do so)
- The Pipeline is compiled to a Module and returned

The new Pipeline is adjoint to the original; it has:

- All the same inputs as the original, in the same order
- Followed by one grad-input for each original output
- Followed by one output for each unique pairing of original-output + original-input. (For the common case of just one original-output, this amounts to being one output for each original-input.)

## compile_to_callable()

Callable Halide::Internal::AbstractGenerator::compile_to_callable | ( | const JITHandlers * | jit_handlers = nullptr,
|  | const std::map< std::string, JITExtern > * | jit_externs = nullptr )

JIT the AbstractGenerator into a Callable (using the currently-set Target) and return it.

If jit_handlers is not null, set the jitted func's jit_handlers to use a copy of it.

If jit_externs is not null, use it to set the jitted func's external dependencies.

## set_generatorparam_values()

void Halide::Internal::AbstractGenerator::set_generatorparam_values | ( | const GeneratorParamsMap & | m | ) |

The documentation for this class was generated from the following file:

- src/AbstractGenerator.h