Extract lambda to named function in monai transforms for dataloader

[iamrjgs]

Description

Pickling of lambda functions is not supported in Windows, causing issue with get_features when iterating over dataset. Extraction of lambda x: x["image_path"].as_tensor() into named function called image_as_tensor on get_transforms sidesteps the issue.

Change adds support for running get_features on Windows 10.

See here: https://discuss.pytorch.org/t/cant-pickle-local-object-dataloader-init-locals-lambda/31857

Related Issue

#306

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• [x ] 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've read the CODE_OF_CONDUCT.md document.
• [x ] I've read the CONTRIBUTING.md guide.
• I've updated the code style using make codestyle.
• I've written tests for all new methods and classes that I created.
• I've written the docstring in Google format for all the methods and classes that I used.

Summary by CodeRabbit

• New Features

  • Introduced a new function to convert image paths to tensor representations, enhancing the transformation process.

• Improvements

  • Streamlined transformation logic by replacing inline functions with a dedicated method for better readability and maintainability.

[coderabbitai]

Walkthrough

The changes introduce a new function, image_as_tensor, in the fmcib/preprocessing/__init__.py file. This function converts an image path into a tensor and is used within the get_transforms function, replacing an inline lambda function that performed the same task. The modifications aim to enhance the readability and maintainability of the code by centralizing the tensor conversion logic without altering existing function signatures or control flow.

Changes

File Path	Change Summary
fmcib/preprocessing/init.py	Added image_as_tensor(x) function to convert image path to tensor, replacing lambda in get_transforms.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant get_transforms
    participant image_as_tensor

    User->>get_transforms: Request transformation
    get_transforms->>image_as_tensor: Convert image path to tensor
    image_as_tensor-->>get_transforms: Return tensor
    get_transforms-->>User: Return transformed data

Loading

🐰 In the meadow where bunnies play,
A function new has come to stay.
With tensors bright, they hop and cheer,
For clarity blooms, the path is clear.
No more lambdas, just joy and fun,
In code we trust, our work is done! 🌼

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Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between 938822c and 3d2014e.

📒 Files selected for processing (1)

• fmcib/preprocessing/__init__.py (3 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• fmcib/preprocessing/init.py

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[surajpaib]

@iamrjgs Thank you for proposing this PR! I will merge this and closed the associated issue