class_docstr: Base class for asserting parameters have been correctly changed.
class_docstr_tok: ["Base","class","for","asserting","parameters","have","been","correctly","changed","."]
code: def flatten_list(self, orig_list):
      iter_list = map(np.atleast_1d, orig_list)
      flat_list = [item for sublist in iter_list for item in sublist]
      return flat_list
  
imports: import pytest
  import numpy
  import matplotlib
  import numpy.testing
  import yellowbrick.style.rcmod
  from tests.base import VisualTestCase
label_desc: Use image node_id 1 for calling the RCParamTester obj's underlying member method code with example usage: obj.flatten_list(orig_list) and returns: flat_list