code: def times2(x: pl.Series) -> pl.Series:
      return x * 2
  
imports: from __future__ import annotations
  import io
  import pickle
  from datetime import datetime, timedelta
  import pytest
  import polars
  from polars import StringCache
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 11 for calling a global function with example usage: times2(x) and returns: unknown