gemseo / mda

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initialization_chain module

MDA input data initialization.

class gemseo.mda.initialization_chain.MDOInitializationChain(disciplines, name=None, grammar_type=GrammarType.JSON, available_data_names=())

Bases: MDOChain

An initialization process for a set of disciplines.

This MDOChain subclass computes the initialization for the computation of a set of disciplines. It is particularly useful in the case of MDAs when not all default_inputs are available, and the execution order is not obvious to compute initial values for all couplings.

From the default inputs of the disciplines, use a greedy algorithm to detect sequentially the disciplines that can be executed, and records the execution order.

The couplings are ignored, and therefore, a true MDA must be used afterwards to ensure consistency.

Initialize self. See help(type(self)) for accurate signature.

Parameters:

• disciplines (list[MDODiscipline]) – The disciplines.

• name (str | None) – The name of the discipline. If None, use the class name.

• grammar_type (MDODiscipline.GrammarType) –

  The type of the input and output grammars.

  By default it is set to “JSONGrammar”.

• available_data_names (Iterable[str]) –

  The data names that are assumed to be available at runtime, in addition to the default_inputs.

  By default it is set to ().

cache: AbstractCache | None

The cache containing one or several executions of the discipline according to the cache policy.

data_processor: DataProcessor

A tool to pre- and post-process discipline data.

exec_for_lin: bool

Whether the last execution was due to a linearization.

input_grammar: BaseGrammar

The input grammar.

jac: MutableMapping[str, MutableMapping[str, ndarray | csr_array | JacobianOperator]]

The Jacobians of the outputs wrt inputs.

The structure is {output: {input: matrix}}.

name: str

The name of the discipline.

output_grammar: BaseGrammar

The output grammar.

re_exec_policy: ReExecutionPolicy

The policy to re-execute the same discipline.

residual_variables: dict[str, str]

The output variables mapping to their inputs, to be considered as residuals; they shall be equal to zero.

run_solves_residuals: bool

Whether the run method shall solve the residuals.

gemseo.mda.initialization_chain.order_disciplines_from_default_inputs(disciplines, raise_error=True, available_data_names=())

Order disciplines such that all their input values are defined.

It is particularly useful in the case of MDAs when not all default_inputs are available, and the execution order is not obvious to compute initial values for all couplings.

From the default inputs of the disciplines, use a greedy algorithm to detect sequentially the disciplines that can be executed, and records the execution order.

Raises:

ValueError – When not all the disciplines can be initialized.

Parameters:

• disciplines (list[MDODiscipline]) – The disciplines to compute the initialization of.

• raise_error (bool) –

  Whether to raise an exception when the algorithm fails.

  By default it is set to True.

• available_data_names (Iterable[str]) –

  The data names that are assumed to be available at runtime, in addition to the default_inputs.

  By default it is set to ().

Returns:

The ordered disciplines when the algorithm succeeds, or, if raise_error=False, the inputs that are missing.

Return type:

list[MDODiscipline] | list[str]