t-SNE: Fix assert

The data instance could have changed, but the task was not canceled due to self._invalidated = False.

Author: VesnaT

Orange/widgets/unsupervised/owtsne.py

@@ -513,7 +513,7 @@ def run(self):
 
     def __ensure_task_same_for_pca(self, task: Task):
         assert self.data is not None
-        assert task.data is self.data
+        np.testing.assert_array_equal(task.data.X, self.data.X)
         assert task.normalize == self.normalize
         assert task.pca_components == self.pca_components
         assert isinstance(task.pca_projection, Table) and \