SOLVED : Import PyTorch could not be resolved from source Pylance(reportMissingModuleSource)

SOLVED: Import PyTorch Could Not Be Resolved from Source Pylance (reportMissingModuleSource)
Are you encountering the "Import PyTorch could not be resolved from source Pylance (reportMissingModuleSource)" error in Visual Studio Code? This common issue arises when Pylance, the Visual Studio Code extension for Python, cannot locate the PyTorch module. Follow this comprehensive guide to resolve the issue and get back to your development smoothly.
*Step-by-Step Solution:*
*Step 1: Verify PyTorch Installation*
1. Open a terminal or command prompt.
2. Check if PyTorch is installed by running:
```bash
pip show torch
```
If PyTorch is installed, you will see detailed information about the package. If not, install it using:
```bash
pip install torch
```
*Step 2: Ensure Correct Python Interpreter*
1. Open Visual Studio Code.
2. Press `Ctrl + Shift + P` (Windows/Linux) or `Cmd + Shift + P` (Mac) to open the Command Palette.
3. Type `Python: Select Interpreter` and select the interpreter where PyTorch is installed. This step ensures that VSCode uses the correct Python environment.
*Step 3: Reload VSCode*
1. Sometimes, simply reloading VSCode can resolve the issue. Press `Ctrl + Shift + P` (Windows/Linux) or `Cmd + Shift + P` (Mac), type `Reload Window`, and press `Enter`.
*Step 4: Configure Pylance Settings*
1. Open the settings file in Visual Studio Code by navigating to `File - Preferences - Settings` or pressing `Ctrl + ,`.
2. In the search bar, type `Pylance`.
3. Look for the setting `Python - Analysis: Extra Paths` and add the path where PyTorch is installed. This path is usually something like:
```json
"python.analysis.extraPaths": [
"path/to/your/python/site-packages"
]
```
4. You can find the exact path by running the following command in the terminal:
```bash
python -c "import site; print(site.getsitepackages())"
```
*Step 5: Check for Virtual Environment Issues*
1. If you are using a virtual environment, ensure it is activated. In the terminal, navigate to your project directory and activate the virtual environment:
- **Windows**:
```bash
.\venv\Scripts\activate
```
- **Mac/Linux**:
```bash
source venv/bin/activate
```
2. Verify that PyTorch is installed within this virtual environment. If not, install it using:
```bash
pip install torch
```
*Step 6: Update VSCode and Extensions*
1. Ensure that Visual Studio Code and all extensions are up to date. You can update them by going to `Extensions` in the sidebar, clicking on the gear icon next to each extension, and selecting `Check for Updates`.
2. Similarly, update VSCode by going to `Help - Check for Updates`.
*Step 7: Disable and Re-enable Pylance Extension*
1. Go to the Extensions view by clicking on the Extensions icon in the Activity Bar on the side of the window.
2. Search for Pylance, click on the extension, and select `Disable`.
3. After disabling it, restart VSCode, then go back to the Extensions view and enable Pylance again.
*Step 8: Reinstall Pylance Extension*
1. If the issue persists, try reinstalling the Pylance extension. Go to the Extensions view, search for Pylance, click on the extension, and select `Uninstall`.
2. After uninstalling, reinstall it from the Extensions view.
*Example Code to Verify:*
After following the above steps, create a new Python file in VSCode and add the following code to verify the import:
```python
import torch
print(torch.__version__)
```
Run the code by pressing `F5` or using the terminal. If everything is set up correctly, you should see the version of PyTorch printed without any import errors.
By following these steps, you should be able to resolve the "Import PyTorch could not be resolved from source Pylance (reportMissingModuleSource)" error and continue with your development work without interruptions.
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