Why can’t a causal decoder attend to future output tokens?
Those tokens are not yet available during generation. Masking future positions during training keeps the prediction task consistent with that information constraint.
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Yes, when the architecture’s attention pattern permits those positions to interact within the available context. Some models restrict attention through windows or other patterns.
Not by itself. Many heads, layers, residual paths, and later transformations contribute to an answer, so one attention weight is not a complete causal explanation.
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