Fix bug for previous removal of repeat_kv (when key_value_heads > 1 and < attention_heads) #52
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…nd < attention_heads)
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This PR fixed the bug that introduced by previous removal of repeat_kv (#49 ). In the prefiling stage, it works like repeat_kv, while, in the decoding stage, repeat_kv strategy is not required and thus kvcache can be significantly reduced when key_value_heads is small. #51