code: def step_impl(context, start_iter):
      eq_(
          context.tsne.decay_started_at,
          start_iter,
          'Expect decay started to have the "not started value"-1',
      )
  
file_path: nptsne/test/features/steps/TextureTsneExtendedAPI.py
imports: from behave import *
  from nose.tools import *
  import nptsne
  import logging
label_desc: Use image node_id 3 for calling a global function with example usage: step_impl(context, start_iter) without return types