code: def ensure_float(arr):
      
  
      if issubclass(arr.dtype.type, (np.integer, np.bool_)):
          arr = arr.astype(float)
      return arr
docs: Ensure that an array object has a float dtype if possible.
  
      Parameters
      ----------
      arr : array-like
          The array whose data type we want to enforce as float.
  
      Returns
      -------
      float_arr : The original array cast to the float dtype if
                  possible. Otherwise, the original array is returned.