Traceback (most recent call last):
  File "/Users/mhjensen/miniforge3/lib/python3.9/site-packages/jupyter_cache/executors/utils.py", line 58, in single_nb_execution
    executenb(
  File "/Users/mhjensen/miniforge3/lib/python3.9/site-packages/nbclient/client.py", line 1305, in execute
    return NotebookClient(nb=nb, resources=resources, km=km, **kwargs).execute()
  File "/Users/mhjensen/miniforge3/lib/python3.9/site-packages/jupyter_core/utils/__init__.py", line 166, in wrapped
    return loop.run_until_complete(inner)
  File "/Users/mhjensen/miniforge3/lib/python3.9/asyncio/base_events.py", line 647, in run_until_complete
    return future.result()
  File "/Users/mhjensen/miniforge3/lib/python3.9/site-packages/nbclient/client.py", line 705, in async_execute
    await self.async_execute_cell(
  File "/Users/mhjensen/miniforge3/lib/python3.9/site-packages/nbclient/client.py", line 1058, in async_execute_cell
    await self._check_raise_for_error(cell, cell_index, exec_reply)
  File "/Users/mhjensen/miniforge3/lib/python3.9/site-packages/nbclient/client.py", line 914, 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:
------------------
heads_proba = 0.51
coin_tosses = (np.random.rand(10000, 10) < heads_proba).astype(np.int32)
cumulative_heads_ratio = np.cumsum(coin_tosses, axis=0) / np.arange(1, 10001).reshape(-1, 1)
plt.figure(figsize=(8,3.5))
plt.plot(cumulative_heads_ratio)
plt.plot([0, 10000], [0.51, 0.51], "k--", linewidth=2, label="51%")
plt.plot([0, 10000], [0.5, 0.5], "k-", label="50%")
plt.xlabel("Number of coin tosses")
plt.ylabel("Heads ratio")
plt.legend(loc="lower right")
plt.axis([0, 10000, 0.42, 0.58])
save_fig("votingsimple")
plt.show()
------------------


[0;31m---------------------------------------------------------------------------[0m
[0;31mNameError[0m                                 Traceback (most recent call last)
Cell [0;32mIn[1], line 2[0m
[1;32m      1[0m heads_proba [38;5;241m=[39m [38;5;241m0.51[39m
[0;32m----> 2[0m coin_tosses [38;5;241m=[39m ([43mnp[49m[38;5;241m.[39mrandom[38;5;241m.[39mrand([38;5;241m10000[39m, [38;5;241m10[39m) [38;5;241m<[39m heads_proba)[38;5;241m.[39mastype(np[38;5;241m.[39mint32)
[1;32m      3[0m cumulative_heads_ratio [38;5;241m=[39m np[38;5;241m.[39mcumsum(coin_tosses, axis[38;5;241m=[39m[38;5;241m0[39m) [38;5;241m/[39m np[38;5;241m.[39marange([38;5;241m1[39m, [38;5;241m10001[39m)[38;5;241m.[39mreshape([38;5;241m-[39m[38;5;241m1[39m, [38;5;241m1[39m)
[1;32m      4[0m plt[38;5;241m.[39mfigure(figsize[38;5;241m=[39m([38;5;241m8[39m,[38;5;241m3.5[39m))

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