A Technical I.T./DevOps Blog
Problem scenario
You want to test PyTorch. What should you do?
Answer
1. Enter a virtaulenv. Use How Do You Install and Create a Virtual Environment? if necessary.
2. Run this: pip3 install torch
3. Use this program:
# This was produced by a Google search in an AI overview result on Aug 4 2025.
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Problem scenario
You are trying to correct the time of your Windows machine. You run “w32tm /resynch”, but you get “The following error occurred: The service has not been started. (0x80070426)”. What should you do?
Solution
net stop w32time
w32tm /unregister
w32tm /register
net start w32time
w32tm /resync /nowait
If you wanted a non-PowerShell method,
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Continue reading “How Do You Use PowerShell to Correct the Time on Your Windows Machine?”
Problem scenario
You want to test Jax. What should you do?
Answer
1. Enter a virtaulenv. Use How Do You Install and Create a Virtual Environment? if necessary.
2. Run this: $ pip3 install jax
3. Run this: $ pip3 install jaxlib
4. Run this: $ python3
5. Run this (without the “”): import jax.numpy as contint
6.
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Problem scenario
You want to test Ray. What should you do?
Answer
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Problem scenario
You installed cv2 with “pip3 install opencv-python”
You run a Python program, but you get this error:
[ERROR:0] global /tmp/pip-req-build-afu9cjzs/opencv/modules/videoio/src/cap.cpp (160) open VIDEOIO(CV_IMAGES): raised OpenCV exception:
OpenCV(4.5.3) /tmp/pip-req-build-afu9cjzs/opencv/modules/videoio/src/cap_images.cpp:253: error: (-5:Bad argument) CAP_IMAGES: can’t find starting number (in the name of file): https://www.youtube.com/watch?v=abcd1234 in function ‘icvExtractPattern’
What should you do?
Possible Solution
The video file is not there.
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Problem scenario
You run this command:
sudo do-release-upgrade
But you see this error:
“Your python3 install is corrupted. Please fix the ‘/usr/bin/python3’ symlink.”
What should you do?
Solution
Run this command:
tail -n 20 /var/log/dist-upgrade/main.log
Do you see a message like this?
2022-03-18 19:36:59,240 DEBUG python symlink points to: ‘python3.5’, but expected is ‘python2.7’ or ‘/usr/bin/python2.7’
If so,
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Problem scenario
You are coding in Python. For some reason your list is getting out of order. It sometimes works. But sometimes the last item is going to the first item. What is wrong?
Possible Solution #1
Re-examine your logic. Break things up into smaller lists and fewer variables for the sake of testing.
Possible Solution #2
Look at the different input files if there are any.
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Continue reading “How Do You Troubleshoot a List in Python That Gets Out of Order?”
Problem scenario
You have a file that is too big to fit into memory. How can Python read the file?
Possible Solution #1
You can use the “open” method and the “read()” or “readlines()” methods. Avoid using read() because that will read the entire file into memory. The readline() and readlines() methods can be given a byte number as an argument.
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Continue reading “How Do You Write a Python Program to Process a Large File?”
Question
Variables in Java store data (e.g., a string or number). How is instantiation of a variable different from initialization, or are they the same?
Answer
Instantiation is different from initialization. Instantiation is the creation of the variable (e.g., through the Java syntax or invocation of a method that creates the variable). A class can be instantiated or a primitive variable can be instantiated.
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Continue reading “How Is Instantiation Different from Initialization of a Java Variable?”
Problem scenario
You run java commands but you get the error “/usr/bin/java no such file or directory.” What should you do?
Possible Solution #1
Reinstall Java.
Possible Solution #2
You may have deleted a linked file. To find the destination file, run this:
sudo find / -name java -type f
Based on the results,
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Continue reading “How Do You Troubleshoot “/usr/bin/java no such file or directory”?”