code: def convert_num_column_into_string_array(
      numerical_column: pd.Series,
  ) -> pd.Series:
      """Convert pandas column into numpy one-dimensional array"""
      # convert only non-nans values
      true_nums = numerical_column[numerical_column.notna()]
      numerical_column[true_nums.index] = true_nums.astype(
          str, copy=False
      )
      return numerical_column
  
imports: from __future__ import annotations
  from collections.abc import Sequence
  from typing import TYPE_CHECKING, Dict, List, Optional, Tuple
  import numpy
  import pandas
  from golem.core.log import LoggerAdapter, default_log
  from fedot.core.repository.tasks import Task, TaskTypesEnum
label_desc: Use image node_id 5 for calling a global function with example usage: convert_num_column_into_string_array(numerical_column) and returns: numerical_column