Small fixes (#179)

Some small fixes and adds an abstract method.

---------

Co-authored-by: Franz Király <fkiraly@gcos.ai>

Author: SimonBlanke

src/hyperactive/__init__.py

@@ -13,5 +13,3 @@
 
 __version__ = importlib.metadata.version("hyperactive")
 __license__ = "MIT"
-
-__all__ = []

src/hyperactive/base/_optimizer.py

@@ -82,3 +82,26 @@ def solve(self):
         best_params = self._solve(experiment, **search_config)
         self.best_params_ = best_params
         return best_params
+
+    def _solve(self, experiment, *args, **kwargs):
+        """Run the optimization search process.
+
+        Parameters
+        ----------
+        experiment : BaseExperiment
+            The experiment to optimize parameters for.
+        *args : tuple
+            Positional arguments specific to the optimization backend.
+        **kwargs : dict
+            Keyword arguments specific to the optimization backend.
+
+        Returns
+        -------
+        dict with str keys
+            The best parameters found during the search.
+            Must have keys a subset or identical to experiment.paramnames().
+        """
+        raise NotImplementedError(
+            "abstract method, BaseOptimizer._solve should be implemented by "
+            "descendant classes"
+        )

src/hyperactive/opt/random_search.py

@@ -1,4 +1,4 @@
-"""Grid search optimizer."""
+"""Random search optimizer."""
 
 # copyright: hyperactive developers, MIT License (see LICENSE file)