espnet.nets.chainer_backend.transformer.mask.make_history_mask

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espnet.nets.chainer_backend.transformer.mask.make_history_mask(xp, block)

Prepare the history mask.

• Parameters:block (ndarray) – Block with dimensions: (B x S).
• Returns: History mask with dimensions (B, S, S).
• Return type: ndarray, np.ndarray