code: def init():
      init_metrics()
  
file_path: mars/mars/metrics/tests/test_metric_api.py
imports: import pytest
  from random import random
  from ..None import api
  from ..api import init_metrics, Metrics, _percentile_builder, Percentile, record_time_cost_percentile, shutdown_metrics
label_desc: Use image node_id 1 for calling a global function with example usage: init() without return types