Colab notebook save keeps failing - google-colaboratory

Colab keeps telling me that the notebook has been changed outside of my session despite not having any other tabs open with this notebook and so I have to keep "overwriting" the changes made by these non-existent tabs.
Is this a known bug? Is there any solution?

Related

Matplotlib interactive mode in Kaggle

Is there any way to run a notebook in interactive mode in Kaggle?
In this notebook, I'm getting errors with the get_window_extent method, and the images don't show correctly.

YOLOv4-deepsort does not detect while running on Google Colab's GPU

I'm trying to do some object tracking on a video using Google Colab but I'm facing the issue below. Tracking is only done in the first frame of the video and not in the rest. I'm working with exactly same files and same commands both on my computer and Google Colab.
expected
Google Colab
It seems like TensorFlow's version caused this problem. Here is my solution:
!pip install tensorflow==2.3.0

Google Colab Widgets

I have been using ipywidgets in google colab for a while but it today it started asking me to enable third party widgets and presented codes for custome widget managers. The widgets arent getting displayed any more. Was it because of an google colab update or am I making an error. I have attached a picture.
This issue has been detected by google colab team, downgrading ipywidgets to 7.1.1 is the easiest way to solve the problem now.

Hot Reload only works with changes in App.js

Hot reload feature on expo only seems to work when I modify and save App.js.
If I save my changes on a different file, nothing happens. If a change a different file, save it, and then save App.js as well to hot reload the changes, the app refreshes but the changes to the external file aren't there.
I've already checked my network, ran under the tunnel configuration and nothing really seemed to work. I was wondering if anyone else is having a similar issue.
The only thing that made hot reload work was placing the file in the same directory as App.js. I've had the same issue and I couldn't find any other solutions either. Before I figured this out I always had to refresh the server with expo start -c --tunnel. Without the -c flag it didn't refresh my custom components.

how to open pdf file in jupyter file browser?

I would like to open a pdf file using the jupyter notebook's file browser. However, when I click, it always opens a new tab and shows a dark screen.
I spent a couple of minutes looking for a workaround for this and found a github issue in the jupyter project where OP discovered that the issue is resolved by installing the PDF viewer plugin to Chrome
I just installed it and I am now seeing PDF's from my notebook in Chrome.
If you want to open a pdf file using the jupyter filebrowser, you need to use Firefox - Google Chrome blocks it.
Alternatively, to open the pdf inside a jupyter notebook cell, you can use IFrame - but again, it doesn't work for Chrome.
from IPython.display import IFrame, display
#filepath = "http://wikipedia.org" # works with websites too!
filepath = "file.pdf"
IFrame(filepath, width=700, height=400)