Merge branch '56-bugfix-tree-observation-builder' into 'master'

#56 bugfix dimensions in explore branch

Closes #56

See merge request !53

flatland/envs/observations.py

@@ -437,7 +437,7 @@ class TreeObsForRailEnv(ObservationBuilder):
                 for i in range(self.max_depth - depth):
                     num_cells_to_fill_in += pow4
                     pow4 *= 4
-                observation + ([-np.inf] * self.observation_dim) * num_cells_to_fill_in
+                observation = observation + ([-np.inf] * self.observation_dim) * num_cells_to_fill_in
 
         return observation, visited
 
@@ -496,8 +496,8 @@ class TreeObsForRailEnv(ObservationBuilder):
             child_tree = tree[(num_features_per_node + children * child_size):
                               (num_features_per_node + (children + 1) * child_size)]
             tmp_tree_data, tmp_distance_data, tmp_agent_data = self.split_tree(child_tree,
-                                                               num_features_per_node,
-                                                               current_depth=current_depth + 1)
+                                                                               num_features_per_node,
+                                                                               current_depth=current_depth + 1)
             if len(tmp_tree_data) > 0:
                 tree_data.extend(tmp_tree_data)
                 distance_data.extend(tmp_distance_data)