class_docstr: A Space class for agents, variables and methods
  related to the search space.
class_docstr_tok: ["A","Space","class","for","agents",",","variables","and","methods","related","to","the","search","space","."]
code: def lb(self, lb: np.ndarray) -> None:
      if not isinstance(lb, np.ndarray):
          raise e.TypeError("`lb` should be a numpy array")
      if not lb.shape:
          lb = np.expand_dims(lb, -1)
      if lb.shape[0] != self.n_variables:
          raise e.SizeError(
              "`lb` should be the same size as `n_variables`"
          )
  
      self._lb = lb
  
imports: from typing import List, Optional, Tuple, Union
  import numpy
  import opytimizer.utils.exception
  from opytimizer.core import Agent
  from opytimizer.utils import logging
label_desc: Use image node_id 9 for calling the Space obj's underlying member method code with example usage: obj.lb(lb) without return types