Add cross-attention to MultiheadAttention - #156
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MultiheadAttention.__call__now takes an optional second input for the keys and values, withkv_dimfor when it's a different width than the queries.Self-attention output is bit-identical to before, checked against the pre-change code on fixed weights.
📚 Documentation preview 📚: https://pytensor-ml--156.org.readthedocs.build/en/156/