MaskFnAttentionBias._bool_value passes the same rank position tensors to mask_fn. #888
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MaskFnAttentionBias._bool_value passes the same rank position tensors to mask_fn.
When target_positions is set, a rank 3 target_positions and a rank 2
source_positions are passed to mask_fn. From the perspective of a downstream
defining mask_fn, this is a big surprise.