# 3 a Consider the selfattention operation SX defined as.pdf

A

3. (a) Consider the self-attention operation S(X) defined as follows AS(X)t,:=1XWqWkTXT= softmax(At,:)XWv Where XRTDin,WvRDinDk,WkRDinDk,WqRDinDk.Din being the input dimensionality and T a sequence (or set) length (b) (15 points) Show that for any permutation matrix P,PS(X)=S(PX) (c) (5 points) We would like to use S(X) and a linear operation to construct a permutation invariant function G(X) that outputs the same feature representation for any ordering of the input sequence (hence, it is invariant to the input's arrangement). What linear operation can we use? Specifically find an example of a vector w such that G(X)=wTS(X) satisfies the condition G(X)=G(PX) for all permutation matrix P. (d) (15 points) Consider a batched ZRBTD that is for example the output of a self-attention layer. Implement a nn.module or python function using functionalize that takes Z and applies a "Position wise feedforward network" layer, H(x)=relu(W1x+ b) which outputs a tensor of size RBTD as commonly used in transformer models. Implement this in two ways (1) using nn. Linear and (2) using nn. Conv1d with padding 0 , stride 1 and kernel size 1 . Validate your implementations match with an assert statement. You may select a random Z with the size B,T,D of your choosing for validating your implementation..

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### 3 a Consider the selfattention operation SX defined as.pdf

• 1. 3. (a) Consider the self-attention operation S(X) defined as follows AS(X)t,:=1XWqWkTXT= softmax(At,:)XWv Where XRTDin,WvRDinDk,WkRDinDk,WqRDinDk.Din being the input dimensionality and T a sequence (or set) length (b) (15 points) Show that for any permutation matrix P,PS(X)=S(PX) (c) (5 points) We would like to use S(X) and a linear operation to construct a permutation invariant function G(X) that outputs the same feature representation for any ordering of the input sequence (hence, it is invariant to the input's arrangement). What linear operation can we use? Specifically find an example of a vector w such that G(X)=wTS(X) satisfies the condition G(X)=G(PX) for all permutation matrix P. (d) (15 points) Consider a batched ZRBTD that is for example the output of a self-attention layer. Implement a nn.module or python function using functionalize that takes Z and applies a "Position wise feedforward network" layer, H(x)=relu(W1x+ b) which outputs a tensor of size RBTD as commonly used in transformer models. Implement this in two ways (1) using nn. Linear and (2) using nn. Conv1d with padding 0 , stride 1 and kernel size 1 . Validate your implementations match with an assert statement. You may select a random Z with the size B,T,D of your choosing for validating your implementation.
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