InstrumentalVariableRegression.fit_mapping# InstrumentalVariableRegression.fit_mapping(X, y, coords=None)# Fit a specialized model that accepts mapping-valued inputs. Parameters: X (dict[str, DataArray]) – Labeled predictor arrays for specialized model components. y (dict[str, DataArray]) – Labeled target arrays for specialized model components. coords (dict[str, Any] | None) – Coordinate metadata for the model. Return type: DataTree