Data Validator

The power-grid-model repository provides an input/update data validator. For performance reasons, the input/update data is not automatically validated. However, it would be advisable to validate your data before constructing a PowerGridModel instance. An alternative approach would be to validate only when an exception is raised, but be aware that not all data errors will raise exceptions, most of them wil just yield invalid results without warning. The main validation functions and classes can be included from power_grid_model.validation.

Two helper type definitions are used throughout the validation functions, InputData and UpdateData. They are not special types or classes, but merely type hinting aliases:

InputData = Dict[str, np.ndarray]
UpdateData = Dict[str, Union[np.ndarray, Dict[str, np.ndarray]]]

Validation Errors

Each validation error is an object which can be converted to a compact human-readable message using str(error). It contains three member variables component, field and ids, which can be used to gather more specific information about the validation error, e.g. which object IDs are involved.

class ValidationError:
    
    # Component(s): e.g. "node" or ["node", "line"]
    component: Union[str, List[str]]
    
    # Field(s): e.g. "id" or ["line_from", "line_to"] or [("node", "id"), ("line", "id")]
    field: Union[str, List[str], List[Tuple[str, str]]]

    # IDs: e.g. [1, 2, 3] or [("node", 1), ("line", 1)]
    ids: Union[List[int], List[Tuple[str, int]]] = []    

Validation functions

Manual validation

The validation functions below can be used to validate input/batch data manually. The functions require input_data: InputData , which is power-grid-model input data, and symmetric: bool, stating if the data will be used for symmetric or asymmetric calculations. calculation_type: CalculationType is optional and can be supplied to allow missing values for unused fields; see the API reference for more information. To validate update/batch data update_data: UpdateData, power-grid-model update data, should also be supplied.

validate_input_data(input_data, calculation_type, symmetric) -> List[ValidationError] validates input_data.
validate_batch_data(input_data, update_data, calculation_type, symmetric) -> Dict[int, List[ValidationError]] validates input_data in combination with batch/update data.

Note

When doing batch calculations, the input data set by itself is not required to be valid, as long as all missing and invalid values are overwritten in all scenarios in the batch data set. This means, that validate_input_data(input_data, **kwargs) may fail, while validate_batch_data(input_data, update_data, **kwargs) may succeed. In such cases, the latter is leading when only running batch calculations. Running single calculations on an incomplete input data set is, of course, unsupported.

Assertions

Instead of manual validation it is possible to use the assertion functions below to assert valid data. In the case of invalid data a ValidationException will be raised, which is an exception storing the name of the validated data, a list/dict of errors and a convenient conversion to string to display a summary of all the errors when printing the exception.

assert_valid_input_data(input_data, calculation_type, symmetric) raises ValidationException
assert_valid_batch_data(input_data, calculation_type, update_data, symmetric) raises ValidationException

Other than the result/exception type, the behaviour of these functions is the same as for the manual validation functions.

Utilities

errors_to_string(errors, name, details) converts a set of errors to a human-readable (multi-line) string representation