coach v0.8.0

exploration_policies/thompson_sampling.py

@@ -0,0 +1,35 @@
+#
+# Copyright (c) 2017 Intel Corporation 
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from exploration_policies.exploration_policy import *
+
+
+class ThompsonSampling(ExplorationPolicy):
+    def __init__(self, tuning_parameters):
+        """
+        :param tuning_parameters: A Preset class instance with all the running paramaters
+        :type tuning_parameters: Preset
+        """
+        ExplorationPolicy.__init__(self, tuning_parameters)
+        self.action_space_size = tuning_parameters.env.action_space_size
+
+    def get_action(self, action_values):
+        q_values, values_uncertainty = action_values
+        sampled_q_values = np.random.normal(q_values, abs(values_uncertainty))
+        return np.argmax(sampled_q_values)
+
+    def get_control_param(self):
+        return 0