Implement a Data Loader with Readability, Resuming, and Batching (with Tests)
Incrementally design and implement a data loader that supports: (1) readability, (2) resuming/checkpointing, and (3) batching. Each feature is added step by step, and each step requires corresponding unit tests.
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Late November, 2025
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Step by step implement the data loader with the features 1. readability 2. resuming 3. batching 4. all steps requires tests.
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