fix two potential bugs #1
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Two changes: 1. `mask = mask.to(output[0].device).unsqueeze(-1)` -> `mask = mask.to(output[0]).unsqueeze(-1)`, to assure mask has the same device and data type as output[0] 2. add outbound error check. If all heads are sampled to zero, then` a tensor / count_ones` will raise "Division by 0 " Error.
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Two changes:
mask = mask.to(output[0].device).unsqueeze(-1)->mask = mask.to(output[0]).unsqueeze(-1), to assure mask has the same device and data type as output[0]a tensor / count_oneswill raise "Division by 0 " Error.