code: def _ensure_dependecies_installed(self):
      if numpy is None:
          raise ValueError(
              "LSA summarizer requires NumPy. Please, install it by command 'pip install numpy'."
          )
  
file_path: sumy/sumy/summarizers/lsa.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  import math
  from warnings import warn
  from ._summarizer import AbstractSummarizer
label_desc: Use image node_id 4 for calling the LsaSummarizer obj's underlying member method code with example usage: obj._ensure_dependecies_installed() without return types