Nameerror: name ‘torch’ is not defined

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:

1. Create a Conda environment

✅ conda create -n env_pytorch python=3.6

In here you have to add your respective Python version on Conda

2. Activate the environment

✅ conda activate env_pytorch

3. Install PyTorch

✅ pip install torchvision 

4. After that, proceed to Python shell and import the following command:

✅ import torch
✅ import torchvision

If 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 torch

If you are using Python 3:

✅ pip3 install torch

If you are using Jupyter Notebook, use the following command:

✅ !pip install torch

If you are using Anaconda Prompt, you can also try installing PyTorch using the following command:

✅  conda install -c pytorch pytorch

If you are using Ubuntu:

✅  sudo apt install torch

2. 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 torch

If 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 torch

To install:

✅  !pip install torch

Conclusion

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 😊