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I'm trying to set a breakpoint and it complains with ValueError: Fatal exception in the data production loop: signal only works in main thread

It is from https://github.com/tensorflow/models/blob/master/official/recommendation/data_pipeline.py 

class BaseDataConstructor(threading.Thread):

  ...

class BisectionDataConstructor(BaseDataConstructor):

  def construct_lookup_variables(self):

    import pdb; pdb.set_trace()
    start_time = timeit.default_timer()

   def lookup_negative_items(self, negative_users, **kwargs):

     import pdb; pdb.set_trace()
     output = np.zeros(shape=negative_users.shape, dtype=rconst.ITEM_DTYPE) - 1

https://bugs.python.org/issue13120 seems to suggest it's been fixed? (it lists Versions: Python 3.2, Python 3.3, Python 3.4 , so I tried 3.4 and it works with 3.4) ...

I also tried code from pdb cannot break in another thread? and it gives me error as well

I'm on python 3.7.2 on ubuntu

eugene
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