Are you encountering this Python nameerror name torch is not defined error message right now?
If you don’t have any idea how to troubleshoot this error, then continue reading.
In this article, we’ll show you how you can fix the nameerror: name ‘torch’ is not defined in a simple way.
Before we start, this error message is similar to modulenotfounderror no module named torch.
What is “nameerror: name ‘torch’ is not defined”?
The error message nameerror: name ‘torch’ is not defined occurs when the torch module is not imported or installed correctly.
Moreover, this is a common error that you may encounter when you are working with the PyTorch library in Python.
It indicates that Python is unable to find the PyTorch package or module in your current environment or scope.
Why does this error occur?
This error message occurs because of some reasons that include the following:
❌ Forget to import the torch library.
❌ If torch library is not installed on your system.
How to fix “nameerror: name ‘torch’ is not defined”?
Here are the following solutions you can follow that will help you to fix this error.
1. Install PyTorch
You can easily install the torch module, open your command prompt or terminal and execute the following command.
To install PyTorch on Conda using pip, you have to follow the following process:
- Create a Conda environment
✅ conda create -n env_pytorch python=3.6In here you have to add your respective Python version on Conda
- Activate the environment
✅ conda activate env_pytorch- Install PyTorch
✅ pip install torchvision - After that, proceed to Python shell and import the following command:
✅ import torch
✅ import torchvisionIf the above solution does not resolve the error, try to execute the following command. This command will install a torch in your virtual environment on Windows, Linux, and MacOS.
If you are using Python 2:
✅ pip install torchIf you are using Python 3:
✅ pip3 install torchIf you are using Jupyter Notebook, use the following command:
✅ !pip install torchIf you are using Anaconda Prompt, you can also try installing PyTorch using the following command:
✅ conda install -c pytorch pytorchIf you are using Ubuntu:
✅ sudo apt install torch2. Import Import PyTorch
After installing the PyTorch, you need to import it into your Python script before you can use it.
You can import PyTorch using the following code:
✅ import torch
Ensure that you have imported the torch module at the top of your code.
3. Check PyTorch installation and environment
If PyTorch is installed and imported already, but you still encounter the “nameerror: name ‘torch’ is not defined” error.
You can check if PyTorch is installed in the correct environment and if there are any conflicting packages.
You can check the installed packages by running the following command:
✅ !pip list | grep torchIf PyTorch is installed, you can check if it is installed in the correct environment by running the following code:
✅ import sys
print(sys.path)4. Reinstall PyTorch
If none of the above steps work, you can try to uninstall and reinstall PyTorch using the following command:
To uninstall:
✅ !pip uninstall torchTo install:
✅ !pip install torchConclusion
The error message nameerror: name ‘torch’ is not defined occurs when the torch module is not imported or installed correctly.
This article discusses what this error is all about and already provides solutions to help you fix this error.
You could also check out other “nameerror” articles that may help you in the future if you encounter them.
- Nameerror: name ‘sys’ is not defined
- Nameerror: name ‘datetime’ is not defined
- Nameerror: name time is not defined
We are hoping that this article helps you fix the error. Thank you for reading itsourcecoders 😊
Frequently Asked Questions
What is Python NameError and what causes it?
NameError is raised when Python encounters a name (variable, function, class) that hasn’t been defined in the current scope. Most common causes: typo in variable name, using a variable before assigning it, missing import, or referencing a variable that was defined inside a function but accessed outside it.
How do I fix ‘name X is not defined’?
Check three things: (1) Is the name a typo? Compare with the spelling where you defined it. (2) Did you import it? Add ‘from module import X’ or ‘import module’ at the top. (3) Is X defined in a different scope (inside a function, conditional branch, or with-block) that hasn’t executed yet at the point you’re using it? Move the definition before the use.
Why does my variable work in one cell but not another (Jupyter)?
Jupyter kernels keep state between cells. If you defined X in cell 5 and run cell 3 later, X exists. But after Kernel-Restart, only the cells you re-run define their variables. Always run cells top-to-bottom on a fresh kernel before submitting. Use ‘Restart and Run All’ to verify your notebook is reproducible.
What is the difference between NameError and AttributeError?
NameError: the name itself doesn’t exist anywhere in scope (typo, missing import, scope issue). AttributeError: the name exists and points to an object, but that object has no such attribute/method (typo on method name, wrong object type). NameError is about the variable; AttributeError is about what’s inside it.
Where can I find more NameError fixes?
Browse the NameError reference hub for 49+ specific fixes (NumPy, pandas, Jupyter, Python 2 to 3 migration). For Python scope rules see the Python Tutorial hub. For attribute-level errors see AttributeError.
Caren Bautista
Technical Writer at PIES IT Solution
Responsible for crafting clear, well-structured, and beginner-friendly content across the platform. Handles the writing, proofreading, and editorial review of tutorials, guides, and documentation to ensure every article is accurate, readable, and easy to follow.
Expertise: Technical Writing · Content Creation · Documentation · Editorial Writing · JavaScript · TypeScript · Python · Python Errors · HTTP Errors · MS Excel · View all posts by Caren Bautista →