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Update parquet with expanded Sinhala test set

Update Sinhala perplexity test data

Updated README.md

Upload dataset

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Update data_loader.py

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Merge branch 'main' of https://huggingface.co/datasets/Minuri/sinhala-perplexity-test-dataset

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Updated README.md

Add Sinhala perplexity test dataset in CSV format

Add Sinhala perplexity test dataset

initial commit