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1616 - **label_lengths ** (Tensor) - 每个标签序列的长度,它应该有形状 [batch_size] 和 dtype int64。
1717 - **blank ** (int,可选) - RNN-T loss 的空白标签索引,处于半开放区间 [0,B)。数据类型必须为 int32。默认值为 0。
1818 - **fastemit_lambda ** (float,默认 0.001) - FastEmit 的正则化参数(https://arxiv.org/pdf/2010.11148.pdf)。
19- - **reduction ** (str,可选) - 表示如何平均损失,候选是 ``'none'``| ``'mean'``| ``'sum'`` 。如果 : :attr: `reduction ` 是 ``'mean' ``,输出将是损失的总和并除以 batch_size;如果 :attr: `reduction ` 是 ``'sum' ``,返回损失的总和;如果 :attr: `reduction ` 为 ``'none' ``,则不应用 reduction。默认是 ``'mean' ``。
19+ - **reduction ** (str,可选) - 表示如何平均损失,候选是 ``'none' `` | ``'mean' `` | ``'sum' `` 。如果 :attr: `reduction ` 是 ``'mean' ``,输出将是损失的总和并除以 batch_size;如果 :attr: `reduction ` 是 ``'sum' ``,返回损失的总和;如果 :attr: `reduction ` 为 ``'none' ``,则不应用 reduction。默认是 ``'mean' ``。
2020 - **name ** (str,可选) - 操作名称,默认为 None。
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