[ENH] OWRandomize: Add a new widget

Orange/preprocess/preprocess.py

@@ -302,7 +302,7 @@ def __call__(self, data):
 class Randomize(Preprocess):
     """
     Construct a preprocessor for randomization of classes,
-    attributes or metas.
+    attributes and/or metas.
     Given a data table, preprocessor returns a new table in
     which the data is shuffled.
 
@@ -326,8 +326,8 @@ class Randomize(Preprocess):
     >>> randomizer = Randomize(Randomize.RandomizeClasses)
     >>> randomized_data = randomizer(data)
     """
-    Type = Enum("Randomize",
-                "RandomizeClasses, RandomizeAttributes, RandomizeMetas")
+    Type = Enum("Randomize", dict(RandomizeClasses=1, RandomizeAttributes=2,
+                                  RandomizeMetas=4), type=int)
     RandomizeClasses, RandomizeAttributes, RandomizeMetas = Type
 
     def __init__(self, rand_type=RandomizeClasses, rand_seed=None):
@@ -352,15 +352,12 @@ def __call__(self, data):
         new_data = Table(data)
         new_data.ensure_copy()
 
-        if self.rand_type == Randomize.RandomizeClasses:
+        if self.rand_type & Randomize.RandomizeClasses:
             self.randomize(new_data.Y)
-        elif self.rand_type == Randomize.RandomizeAttributes:
+        if self.rand_type & Randomize.RandomizeAttributes:
             self.randomize(new_data.X)
-        elif self.rand_type == Randomize.RandomizeMetas:
+        if self.rand_type & Randomize.RandomizeMetas:
             self.randomize(new_data.metas)
-        else:
-            raise TypeError('Unsupported type')
-
         return new_data
 
     def randomize(self, table):

Orange/tests/test_randomize.py

@@ -54,6 +54,22 @@ def test_randomize_metas(self):
         self.assertTrue((np.sort(data.metas, axis=0) == np.sort(
             data_rand.metas, axis=0)).all())
 
+    def test_randomize_all(self):
+        data = self.zoo
+        rand_type = Randomize.RandomizeClasses | Randomize.RandomizeAttributes \
+                    | Randomize.RandomizeMetas
+        randomizer = Randomize(rand_type=rand_type)
+        data_rand = randomizer(data)
+        self.assertTrue((data.Y != data_rand.Y).any())
+        self.assertTrue((np.sort(data.Y, axis=0) == np.sort(
+            data_rand.Y, axis=0)).all())
+        self.assertTrue((data.X != data_rand.X).any())
+        self.assertTrue((np.sort(data.X, axis=0) == np.sort(
+            data_rand.X, axis=0)).all())
+        self.assertTrue((data.metas != data_rand.metas).any())
+        self.assertTrue((np.sort(data.metas, axis=0) == np.sort(
+            data_rand.metas, axis=0)).all())
+
     def test_randomize_keep_original_data(self):
         data_orig = self.zoo
         data = Table("zoo")

Orange/widgets/data/owrandomize.py

@@ -0,0 +1,122 @@
+import random
+
+from AnyQt.QtCore import Qt
+from AnyQt.QtWidgets import QSizePolicy
+
+from Orange.data import Table
+from Orange.preprocess import Randomize
+from Orange.widgets.settings import Setting
+from Orange.widgets.widget import OWWidget
+from Orange.widgets import gui
+
+
+class OWRandomize(OWWidget):
+    name = "Randomize"
+    description = "Randomize features, class and/or metas in data table."
+    icon = "icons/Random.svg"
+    priority = 2100
+
+    inputs = [("Data", Table, "set_data")]
+    outputs = [("Data", Table)]
+
+    resizing_enabled = False
+    want_main_area = False
+
+    shuffle_class = Setting(True)
+    shuffle_attrs = Setting(False)
+    shuffle_metas = Setting(False)
+    scope_prop = Setting(80)
+    random_seed = Setting(0)
+    auto_apply = Setting(True)
+
+    def __init__(self):
+        super().__init__()
+        self.data = None
+
+        # GUI
+        box = gui.hBox(self.controlArea, "Shuffled columns")
+        box.layout().setSpacing(20)
+        self.class_check = gui.checkBox(
+            box, self, "shuffle_class", "Classes",
+            callback=self._shuffle_check_changed)
+        self.attrs_check = gui.checkBox(
+            box, self, "shuffle_attrs", "Features",
+            callback=self._shuffle_check_changed)
+        self.metas_check = gui.checkBox(
+            box, self, "shuffle_metas", "Metas",
+            callback=self._shuffle_check_changed)
+
+        box = gui.vBox(self.controlArea, "Shuffled rows")
+        hbox = gui.hBox(box)
+        gui.widgetLabel(hbox, "None")
+        self.scope_slider = gui.hSlider(
+            hbox, self, "scope_prop", minValue=0, maxValue=100, width=140,
+            createLabel=False, callback=self._scope_slider_changed)
+        gui.widgetLabel(hbox, "All")
+        self.scope_label = gui.widgetLabel(
+            box, "", alignment=Qt.AlignCenter,
+            sizePolicy=(QSizePolicy.MinimumExpanding, QSizePolicy.Fixed))
+        self._set_scope_label()
+        gui.separator(box, 10, 10)
+        self.replicable_check = gui.checkBox(
+            box, self, "random_seed", "Replicable shuffling",
+            callback=self._shuffle_check_changed)
+
+        self.apply_button = gui.auto_commit(
+            self.controlArea, self, "auto_apply", "&Apply",
+            box=False, commit=self.apply)
+
+    @property
+    def parts(self):
+        return [self.shuffle_class, self.shuffle_attrs, self.shuffle_metas]
+
+    def _shuffle_check_changed(self):
+        self.apply()
+
+    def _scope_slider_changed(self):
+        self._set_scope_label()
+        self.apply()
+
+    def _set_scope_label(self):
+        self.scope_label.setText("{}%".format(self.scope_prop))
+
+    def set_data(self, data):
+        self.data = data
+        self.apply()
+
+    def apply(self):
+        data = None
+        if self.data:
+            rand_seed = self.random_seed or None
+            size = int(len(self.data) * self.scope_prop / 100)
+            random.seed(rand_seed)
+            indices = sorted(random.sample(range(len(self.data)), size))
+            type_ = sum(t for t, p in zip(Randomize.Type, self.parts) if p)
+            randomized = Randomize(type_, rand_seed)(self.data[indices])
+            data = self.data.copy()
+            for i, instance in zip(indices, randomized):
+                data[i] = instance
+        self.send("Data", data)
+
+    def send_report(self):
+        labels = ["classes", "features", "metas"]
+        include = [label for label, i in zip(labels, self.parts) if i]
+        text = "none" if not include else \
+            " and ".join(filter(None, (", ".join(include[:-1]), include[-1])))
+        self.report_items(
+            "Settings",
+            [("Shuffled columns", text),
+             ("Proportion of shuffled rows", "{}%".format(self.scope_prop)),
+             ("Replicable", ["no", "yes"][self.random_seed])])
+
+
+if __name__ == "__main__":
+    from AnyQt.QtWidgets import QApplication
+
+    app = QApplication([])
+    ow = OWRandomize()
+    d = Table("iris")
+    ow.set_data(d)
+    ow.show()
+    app.exec_()
+    ow.saveSettings()

Orange/widgets/data/tests/test_owrandomize.py

@@ -0,0 +1,74 @@
+# Test methods with long descriptive names can omit docstrings
+# pylint: disable=missing-docstring
+
+import numpy as np
+
+from Orange.data import Table
+from Orange.widgets.data.owrandomize import OWRandomize
+from Orange.widgets.tests.base import WidgetTest
+
+
+class TestOWRandomize(WidgetTest):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.zoo = Table("zoo")
+
+    def setUp(self):
+        self.widget = self.create_widget(OWRandomize)
+
+    def test_data(self):
+        """Check widget's data and output with data on the input"""
+        self.assertEqual(self.widget.data, None)
+        self.send_signal("Data", self.zoo)
+        self.assertEqual(self.widget.data, self.zoo)
+        output = self.get_output("Data")
+        np.testing.assert_array_equal(output.X, self.zoo.X)
+        np.testing.assert_array_equal(output.metas, self.zoo.metas)
+        self.assertTrue((output.Y != self.zoo.Y).any())
+        self.assertTrue((np.sort(output.Y, axis=0) ==
+                         np.sort(self.zoo.Y, axis=0)).all())
+        self.send_signal("Data", None)
+        self.assertEqual(self.widget.data, None)
+        self.assertIsNone(self.get_output("Data"))
+
+    def test_shuffling(self):
+        """Check widget's output for all types of shuffling"""
+        self.send_signal("Data", self.zoo)
+        self.widget.class_check.setChecked(True)
+        self.widget.attrs_check.setChecked(True)
+        self.widget.metas_check.setChecked(True)
+        output = self.get_output("Data")
+        self.assertTrue((output.X != self.zoo.X).any())
+        self.assertTrue((np.sort(output.X, axis=0) ==
+                         np.sort(self.zoo.X, axis=0)).all())
+        self.assertTrue((output.Y != self.zoo.Y).any())
+        self.assertTrue((np.sort(output.Y, axis=0) ==
+                         np.sort(self.zoo.Y, axis=0)).all())
+        self.assertTrue((output.metas != self.zoo.metas).any())
+        self.assertTrue((np.sort(output.metas, axis=0) ==
+                         np.sort(self.zoo.metas, axis=0)).all())
+
+    def test_scope(self):
+        self.send_signal("Data", self.zoo)
+        output = self.get_output("Data")
+        n_zoo = len(self.zoo)
+        s = int(self.widget.scope_prop / 100 * n_zoo)
+        self.assertGreater(sum((output.Y == self.zoo.Y).astype(int)), n_zoo - s)
+        self.assertLessEqual(sum((output.Y != self.zoo.Y).astype(int)), s)
+
+    def test_replicable_shuffling(self):
+        """Check widget's output for replicable shuffling """
+        self.send_signal("Data", self.zoo)
+        self.widget.replicable_check.setChecked(True)
+        output = self.get_output("Data")
+        np.testing.assert_array_equal(output.X, self.zoo.X)
+        np.testing.assert_array_equal(output.metas, self.zoo.metas)
+        self.assertTrue((output.Y != self.zoo.Y).any())
+        self.assertTrue((np.sort(output.Y, axis=0) ==
+                         np.sort(self.zoo.Y, axis=0)).all())
+        self.widget.apply()
+        output2 = self.get_output("Data")
+        np.testing.assert_array_equal(output.X, output2.X)
+        np.testing.assert_array_equal(output.Y, output2.Y)
+        np.testing.assert_array_equal(output.metas, output2.metas)

doc/visual-programming/source/index.rst

@@ -33,6 +33,7 @@ Data
    widgets/data/transpose
    widgets/data/discretize
    widgets/data/continuize
+   widgets/data/randomize
    widgets/data/concatenate
    widgets/data/paintdata
    widgets/data/pythonscript

doc/visual-programming/source/widgets/data/randomize.rst

@@ -0,0 +1,26 @@
+Randomize
+=========
+
+.. figure:: icons/randomize.png
+
+Shuffles classes, features and/or metas of data.
+
+Signals
+-------
+
+**Inputs**:
+
+-  **Data**
+
+   Data set.
+
+**Outputs**:
+
+-  **Data**
+
+   Randomized data set.
+
+Description
+-----------
+
+A simple widget that shuffles classes, features and/or metas of data.