Week 1 Optional lab 03: Cost Function

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
1

Hi guys,

The code in optional lab runs without a problem.

But when I copied all the files on my PC and want to run them on Jupyter Notebook, I get the following Traceback Message

--------------------------------------------------------------------------- RuntimeError Traceback (most recent call last)
…
RuntimeError: ‘widget’ is not a recognised backend name During handling of the above exception,
…
RuntimeError: 'widget is not a recognised GUI loop or backend name

Does anyone have an idea what might be going wrong?

2

You have to install the same versions of all of the tools that Coursera uses.

3

This means the versions of Python, numpy, scikit, TensorFlow, etc.

4

Ok. I will check it out. Thank you!

5

Did you solve the problem?
if yes, how? and which versions are you downloading or using other than the newest version?

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6

The optional labs are very rarely updated, and since you don’t have to edit any of their contents, you just run them cell by cell.

7

Hi, on MacOS Sonoma 14.5, with:

  • Python 3.12.3
  • Jupyter 1.0.0
  • Jupyter widgets 3.0.11
    running the notebook in JetBrains PyCharm 2024.1.1, commenting out the line %matplotlib widget below worked for me.
import numpy as np
# %matplotlib widget
import matplotlib.pyplot as plt
from lab_utils_uni import plt_intuition, plt_stationary, plt_update_onclick, soup_bowl
plt.style.use('./deeplearning.mplstyle')
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8

Commenting the line didn’t help.
Then I get “ModuleNotFoundError: No module named ‘ipywidgets’”

9

Are you running the lab on Coursera, or on some other platform?

10

It worked on Coursera.
Now I am running on my own computer.
Found a fix (thanks to meta.ai). Replaced the magic command with %matplotlib ipympl
Then had to install ipympl (pip install ipympl) and restarted the kernel. The error went away.

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11

Even “%matplotlib widget” works now.
So, looks like you just need to install ipympl.

Remember to restart kernel.

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