Add grpo difficulty curriculum#1694
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This pull request implements a difficulty-aware curriculum for GRPO training. It introduces a new DifficultyCurriculumHFDataLoader that samples prompts based on difficulty metadata, a utility script create_difficulty_map.py to generate this metadata from pass-rate datasets, and several training configuration scripts. The reviewer provided actionable feedback, including a fix for epoch-based index repetition in the dataloader, a correction for NumPy type serialization in the difficulty map script, and a fix for a typo in a dataset repository path.
…o split-create-difficulty-map
…-curriculum # Conflicts: # open_instruct/data_loader.py
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