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RULER-1M NIAH Eval — external handoff

50 × single_needle_uuid samples at ~1 M tokens per sample. One of four length variants (1 M / 2 M / 6 M / 12 M) prepared for the external long-context retrieval handoff.

field value
samples 50
tasks {single_needle_uuid: 50}
target tokens 1,000,000
seed 1344
negative_rate 0.0

eval/heldout/data.jsonl is the chat-templated form, ready for model.forward(); eval/heldout/raw.jsonl is the pre-template form (tokenizer-agnostic — re-pack with subq-data ruler-pack against any target tokenizer).

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