The comment in the Bi-LSTM (Attention) model has an issue.

The comment `# output : [batch_size, len_seq, n_hidden]` should indeed be corrected to `# output : [batch_size, len_seq, n_hidden*2]` because the Bi-LSTM model is bidirectional. In a bidirectional LSTM, the hidden size is effectively doubled, as it concatenates the forward and backward hidden states. Therefore, the correct shape of the `output` after permutation is `[batch_size, len_seq, n_hidden * 2]`.

定位 Bi-LSTM (Attention) 模型的 notebook，并阅读周围的输出置换代码和注释。修正文档中记录的输出形状，使其包含双向 hidden size，然后验证注释是否与模型的实际输出维度一致。

由索引模型根据 Issue 内容生成。