Parameter Fitter: Retain settings on input

Orange/base.py

@@ -3,7 +3,7 @@
 from collections.abc import Iterable
 import re
 import warnings
-from typing import Callable, Optional, NamedTuple, Union, Type
+from typing import Callable, Optional, NamedTuple, Type
 
 import numpy as np
 import scipy
@@ -186,8 +186,8 @@ def active_preprocessors(self):
                 self.preprocessors is not type(self).preprocessors):
             yield from type(self).preprocessors
 
-    # declared for derived classes, pylint: disable=unused-argument
-    def fitted_parameters(self, problem_type: Union[str, Table, Domain]) -> list:
+    @property
+    def fitted_parameters(self) -> list:
         return []
 
     # pylint: disable=no-self-use

Orange/classification/random_forest.py

@@ -1,6 +1,6 @@
 import sklearn.ensemble as skl_ensemble
 
-from Orange.base import RandomForestModel, Learner
+from Orange.base import RandomForestModel
 from Orange.classification import SklLearner, SklModel
 from Orange.classification.tree import SklTreeClassifier
 from Orange.data import Variable, DiscreteVariable
@@ -58,7 +58,3 @@ def __init__(self,
                  preprocessors=None):
         super().__init__(preprocessors=preprocessors)
         self.params = vars()
-
-    def fitted_parameters(self, _) -> list[Learner.FittedParameter]:
-        return [self.FittedParameter("n_estimators", "Number of trees",
-                                     int, 1, None)]

Orange/evaluation/testing.py

@@ -98,6 +98,7 @@ def __init__(self, data=None, *,
                  row_indices=None, folds=None, score_by_folds=True,
                  learners=None, models=None, failed=None,
                  actual=None, predicted=None, probabilities=None,
+                 # pylint: disable=unused-argument
                  store_data=None, store_models=None,
                  train_time=None, test_time=None):
         """

Orange/modelling/randomforest.py

@@ -1,8 +1,6 @@
-from typing import Union
-
 from Orange.base import RandomForestModel, Learner
 from Orange.classification import RandomForestLearner as RFClassification
-from Orange.data import Variable, Domain, Table
+from Orange.data import Variable
 from Orange.modelling import SklFitter
 from Orange.preprocess.score import LearnerScorer
 from Orange.regression import RandomForestRegressionLearner as RFRegression
@@ -27,8 +25,7 @@ class RandomForestLearner(SklFitter, _FeatureScorerMixin):
 
     __returns__ = RandomForestModel
 
-    def fitted_parameters(
-            self,
-            problem_type: Union[str, Table, Domain]
-    ) -> list[Learner.FittedParameter]:
-        return self.get_learner(problem_type).fitted_parameters(problem_type)
+    @property
+    def fitted_parameters(self) -> list[Learner.FittedParameter]:
+        return [self.FittedParameter("n_estimators", "Number of trees",
+                                     int, 1, None)]

Orange/regression/pls.py

@@ -255,7 +255,8 @@ def incompatibility_reason(self, domain):
                     reason = "Only numeric target variables expected."
         return reason
 
-    def fitted_parameters(self, _) -> list[Learner.FittedParameter]:
+    @property
+    def fitted_parameters(self) -> list[Learner.FittedParameter]:
         return [self.FittedParameter("n_components", "Components",
                                      int, 1, None)]
 

Orange/regression/random_forest.py

@@ -1,6 +1,6 @@
 import sklearn.ensemble as skl_ensemble
 
-from Orange.base import RandomForestModel, Learner
+from Orange.base import RandomForestModel
 from Orange.data import Variable, ContinuousVariable
 from Orange.preprocess.score import LearnerScorer
 from Orange.regression import SklLearner, SklModel
@@ -57,7 +57,3 @@ def __init__(self,
                  preprocessors=None):
         super().__init__(preprocessors=preprocessors)
         self.params = vars()
-
-    def fitted_parameters(self, _) -> list[Learner.FittedParameter]:
-        return [self.FittedParameter("n_estimators", "Number of trees",
-                                     int, 1, None)]

Orange/regression/tests/test_pls.py

@@ -22,7 +22,7 @@ def table(rows, attr, variables):
 
 class TestPLSRegressionLearner(unittest.TestCase):
     def test_fitted_parameters(self):
-        fitted_parameters = PLSRegressionLearner().fitted_parameters(None)
+        fitted_parameters = PLSRegressionLearner().fitted_parameters
         self.assertIsInstance(fitted_parameters, list)
         self.assertEqual(len(fitted_parameters), 1)
 

Orange/widgets/evaluate/owparameterfitter.py

@@ -320,12 +320,12 @@ class Inputs:
     DEFAULT_PARAMETER_INDEX = 0
     DEFAULT_MINIMUM = 1
     DEFAULT_MAXIMUM = 9
-    parameter_index = Setting(DEFAULT_PARAMETER_INDEX, schema_only=True)
+    parameter_index = Setting(DEFAULT_PARAMETER_INDEX)
     FROM_RANGE, MANUAL = range(2)
     type: int = Setting(FROM_RANGE)
-    minimum: int = Setting(DEFAULT_MINIMUM, schema_only=True)
-    maximum: int = Setting(DEFAULT_MAXIMUM, schema_only=True)
-    manual_steps: str = Setting("", schema_only=True)
+    minimum: int = Setting(DEFAULT_MINIMUM)
+    maximum: int = Setting(DEFAULT_MAXIMUM)
+    manual_steps: str = Setting("")
     auto_commit = Setting(True)
 
     class Error(OWWidget.Error):
@@ -345,13 +345,10 @@ def __init__(self):
         self._data: Optional[Table] = None
         self._learner: Optional[Learner] = None
         self.__parameters_model = QStandardItemModel()
-
-        self.__pending_parameter_index = self.parameter_index \
-            if self.parameter_index != self.DEFAULT_PARAMETER_INDEX else None
-        self.__pending_minimum = self.minimum \
-            if self.minimum != self.DEFAULT_MINIMUM else None
-        self.__pending_maximum = self.maximum \
-            if self.maximum != self.DEFAULT_MAXIMUM else None
+        self.__initialize_settings = \
+            self.parameter_index == self.DEFAULT_PARAMETER_INDEX and \
+            self.minimum == self.DEFAULT_MINIMUM and \
+            self.maximum == self.DEFAULT_MAXIMUM
 
         self.setup_gui()
         VisualSettingsDialog(
@@ -418,10 +415,13 @@ def _():
 
         gui.auto_apply(self.buttonsArea, self, "auto_commit")
 
+        self._update_preview()
+
     def __on_type_changed(self):
         self._settings_changed()
 
     def __on_parameter_changed(self):
+        self.__initialize_settings = True
         self._set_range_controls()
         self._settings_changed()
 
@@ -439,19 +439,16 @@ def _settings_changed(self):
 
     @property
     def fitted_parameters(self) -> list:
-        if not self._learner \
-                or isinstance(self._learner, Fitter) and not self._data:
+        if not self._learner:
             return []
-        return self._learner.fitted_parameters(self._data)
+        return self._learner.fitted_parameters
 
     @property
     def initial_parameters(self) -> dict:
         if not self._learner:
             return {}
         if isinstance(self._learner, Fitter):
-            if not self._data:
-                return {}
-            return self._learner.get_params(self._data)
+            return self._learner.get_params(self._data or "classification")
         return self._learner.params
 
     @property
@@ -495,38 +492,32 @@ def _steps_from_manual(self) -> tuple[int, ...]:
     @Inputs.data
     @check_multiple_targets_input
     def set_data(self, data: Optional[Table]):
+        self.Error.not_enough_data.clear()
+        self.Error.missing_target.clear()
         self._data = data
+        if self._data and len(self._data) < N_FOLD:
+            self.Error.not_enough_data()
+            self._data = None
+        if self._data and len(self._data.domain.class_vars) < 1:
+            self.Error.missing_target()
+            self._data = None
 
     @Inputs.learner
     def set_learner(self, learner: Optional[Learner]):
+        if self._learner:
+            self.__initialize_settings = \
+                not isinstance(self._learner, type(learner))
         self._learner = learner
 
     def handleNewSignals(self):
         self.Warning.clear()
         self.Error.unknown_err.clear()
-        self.Error.not_enough_data.clear()
         self.Error.incompatible_learner.clear()
         self.Error.manual_steps_error.clear()
         self.Error.min_max_error.clear()
-        self.Error.missing_target.clear()
         self.clear()
 
-        if self._data is None or self._learner is None:
-            return
-
-        if self._data and len(self._data) < N_FOLD:
-            self.Error.not_enough_data()
-            self._data = None
-            return
-
-        if self._data and len(self._data.domain.class_vars) < 1:
-            self.Error.missing_target()
-            self._data = None
-            return
-
-        reason = self._learner.incompatibility_reason(self._data.domain)
-        if reason:
-            self.Error.incompatible_learner(reason)
+        if self._learner is None:
             return
 
         for param in self.fitted_parameters:
@@ -535,19 +526,22 @@ def handleNewSignals(self):
         if not self.fitted_parameters:
             self.Warning.no_parameters(self._learner.name)
         else:
-            if self.__pending_parameter_index is not None:
-                self.parameter_index = self.__pending_parameter_index
+            if self.__initialize_settings:
+                self.parameter_index = 0
+            else:
                 self.__combo.setCurrentIndex(self.parameter_index)
-                self.__pending_parameter_index = None
             self._set_range_controls()
-            if self.__pending_minimum is not None:
-                self.minimum = self.__pending_minimum
-                self.__pending_minimum = None
-            if self.__pending_maximum is not None:
-                self.maximum = self.__pending_maximum
-                self.__pending_maximum = None
 
         self._update_preview()
+
+        if self._data is None:
+            return
+
+        reason = self._learner.incompatibility_reason(self._data.domain)
+        if reason:
+            self.Error.incompatible_learner(reason)
+            return
+
         self.commit.now()
 
     def _set_range_controls(self):
@@ -561,19 +555,24 @@ def _set_range_controls(self):
             if param.min is not None:
                 self.__spin_min.setMinimum(param.min)
                 self.__spin_max.setMinimum(param.min)
-                self.minimum = param.min
+                if self.__initialize_settings:
+                    self.minimum = param.min
             else:
                 self.__spin_min.setMinimum(-MIN_MAX_SPIN)
                 self.__spin_max.setMinimum(-MIN_MAX_SPIN)
-                self.minimum = self.initial_parameters[param.name]
+                if self.__initialize_settings:
+                    self.minimum = self.initial_parameters[param.name]
             if param.max is not None:
                 self.__spin_min.setMaximum(param.max)
                 self.__spin_max.setMaximum(param.max)
-                self.maximum = param.max
+                if self.__initialize_settings:
+                    self.maximum = param.max
             else:
                 self.__spin_min.setMaximum(MIN_MAX_SPIN)
                 self.__spin_max.setMaximum(MIN_MAX_SPIN)
-                self.maximum = self.initial_parameters[param.name]
+                if self.__initialize_settings:
+                    self.maximum = self.initial_parameters[param.name]
+            self.__initialize_settings = False
 
         tip = "Enter a list of values"
         if param.min is not None: