coach v0.8.0

exploration_policies/additive_noise.py

@@ -0,0 +1,46 @@
+#
+# 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.
+#
+
+import numpy as np
+from exploration_policies.exploration_policy import *
+
+
+class AdditiveNoise(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.variance = tuning_parameters.exploration.initial_noise_variance_percentage
+        self.final_variance = tuning_parameters.exploration.final_noise_variance_percentage
+        self.decay_steps = tuning_parameters.exploration.noise_variance_decay_steps
+        self.variance_decay_delta = (self.variance - self.final_variance) / float(self.decay_steps)
+
+    def decay_exploration(self):
+        if self.variance > self.final_variance:
+            self.variance -= self.variance_decay_delta
+        elif self.variance < self.final_variance:
+            self.variance = self.final_variance
+
+    def get_action(self, action_values):
+        if self.phase == RunPhase.TRAIN:
+            self.decay_exploration()
+        action = np.random.normal(action_values, 2 * self.variance * self.action_abs_range)
+        return action #np.clip(action, -self.action_abs_range, self.action_abs_range).squeeze()
+
+    def get_control_param(self):
+        return self.variance