Torch fallbacks of the linear-attention ops drop `seq_idx` / `cu_seqlens`, so packed documents leak without the optional packages

当你在没有安装 flash-linear-attention / causal-conv1d 等可选加速包的环境中,用 DataCollatorWithFlattening 做 packed(无 padding)训练或推理时,linear-attention 的 Torch fallback 会丢弃








