Traceback (most recent call last):
  File "/opt/anaconda3/lib/python3.8/site-packages/jupyter_cache/executors/utils.py", line 51, in single_nb_execution
    executenb(
  File "/opt/anaconda3/lib/python3.8/site-packages/nbclient/client.py", line 1087, in execute
    return NotebookClient(nb=nb, resources=resources, km=km, **kwargs).execute()
  File "/opt/anaconda3/lib/python3.8/site-packages/nbclient/util.py", line 74, in wrapped
    return just_run(coro(*args, **kwargs))
  File "/opt/anaconda3/lib/python3.8/site-packages/nbclient/util.py", line 53, in just_run
    return loop.run_until_complete(coro)
  File "/opt/anaconda3/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "/opt/anaconda3/lib/python3.8/site-packages/nbclient/client.py", line 540, in async_execute
    await self.async_execute_cell(
  File "/opt/anaconda3/lib/python3.8/site-packages/nbclient/client.py", line 832, in async_execute_cell
    self._check_raise_for_error(cell, exec_reply)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbclient/client.py", line 740, in _check_raise_for_error
    raise CellExecutionError.from_cell_and_msg(cell, exec_reply['content'])
nbclient.exceptions.CellExecutionError: An error occurred while executing the following cell:
------------------
# state transition matrix
A = np.array([
    [0.95, 0.05],
    [0.10, 0.90]
])

# observation matrix
B = np.array([
    [1/6, 1/6, 1/6, 1/6, 1/6, 1/6], # fair die
    [1/10, 1/10, 1/10, 1/10, 1/10, 5/10] # loaded die
])

pi, _ = normalize(np.array([1, 1]))
pi = np.array(pi)


(nstates, nobs) = np.shape(B)

------------------

[0;31m---------------------------------------------------------------------------[0m
[0;31mNameError[0m                                 Traceback (most recent call last)
[0;32m<ipython-input-3-2f308bef5393>[0m in [0;36m<module>[0;34m[0m
[1;32m     11[0m ])
[1;32m     12[0m [0;34m[0m[0m
[0;32m---> 13[0;31m [0mpi[0m[0;34m,[0m [0m_[0m [0;34m=[0m [0mnormalize[0m[0;34m([0m[0mnp[0m[0;34m.[0m[0marray[0m[0;34m([0m[0;34m[[0m[0;36m1[0m[0;34m,[0m [0;36m1[0m[0;34m][0m[0;34m)[0m[0;34m)[0m[0;34m[0m[0;34m[0m[0m
[0m[1;32m     14[0m [0mpi[0m [0;34m=[0m [0mnp[0m[0;34m.[0m[0marray[0m[0;34m([0m[0mpi[0m[0;34m)[0m[0;34m[0m[0;34m[0m[0m
[1;32m     15[0m [0;34m[0m[0m

[0;31mNameError[0m: name 'normalize' is not defined
NameError: name 'normalize' is not defined