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The token-shifting part was not correctly done in the previous implementation. It wasn't copied back to k_cache after a decode. As a result, the model was always lerping towards zero when decoding. Prefill(and as a result, PPL evaluation) wasn't affected.
Somehow this mistake didn't affect much on text generation as well lol (maybe the large 32B model already got enough context information into the wkv state?). That's why the bug wasn't found previously.