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'RuntimeError: maximum recursion depth exceeded' when trying to serialize model

See original GitHub issue

When I try

joblib.dump(model, 'my_model.pkl', compress=9)

or to pickle the model, I get:

  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "/usr/lib/python2.7/pickle.py", line 425, in save_reduce
    save(state)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 655, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 687, in _batch_setitems
    save(v)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 606, in save_list
    self._batch_appends(iter(obj))
  File "/usr/lib/python2.7/pickle.py", line 639, in _batch_appends
    save(x)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "/usr/lib/python2.7/pickle.py", line 425, in save_reduce
    save(state)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 655, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 687, in _batch_setitems
    save(v)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 606, in save_list
    self._batch_appends(iter(obj))
  File "/usr/lib/python2.7/pickle.py", line 639, in _batch_appends
    save(x)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 554, in save_tuple
    save(element)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "/usr/lib/python2.7/pickle.py", line 425, in save_reduce
    save(state)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 655, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 686, in _batch_setitems
    save(k)
  File "/home/moose/.local/lib/python2.7/site-packages/sklearn/externals/joblib/numpy_pickle.py", line 280, in save
    return Pickler.save(self, obj)
  File "/usr/lib/python2.7/pickle.py", line 271, in save
    pid = self.persistent_id(obj)
RuntimeError: maximum recursion depth exceeded