Created
August 9, 2020 13:06
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Functions to extract for a xgboost forest for each tree and each leaf - the middle nodes that create the path to reach it.
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| def _root_to_leaf_route(df, stack, routes): | |
| current_node = df.loc[df.Node == stack[-1]] | |
| if current_node.Feature.values[0] == 'Leaf': | |
| routes[current_node.Node.values[0]] = list(stack) | |
| stack.pop() | |
| return | |
| stack.append(int(current_node.Yes.values[0].split('-')[1])) | |
| _root_to_leaf_route(df, stack, routes) | |
| stack.append(int(current_node.No.values[0].split('-')[1])) | |
| _root_to_leaf_route(df, stack, routes) | |
| stack.pop() | |
| return | |
| def extract_root_to_leaf_routes_for_forest(xgb): | |
| routes_forest = {} | |
| for i in range(len(xgb.get_booster().get_dump())): | |
| routes_forest[i] = extract_root_to_leaf_routes_for_tree(xgb, i) | |
| return routes_forest | |
| def extract_root_to_leaf_routes_for_tree(xgb, tree_index): | |
| df = xgb.get_booster().trees_to_dataframe() | |
| df = df.loc[df.Tree == tree_index].set_index('ID') | |
| routes = {} | |
| stack = [0] | |
| _root_to_leaf_route(df, stack, routes) | |
| return routes |
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