Remove duplicated operators

Questions
1

model parsed from pytorch may contain many duplicated operators. Is there a pass which can remove duplicated operators? e.g.

%1 = relay.take(%0, 0, axis=1, model="wrap");
%2 = relay.take(%0, 0, axis=1, model="wrap");
%3 = relay.multiply(%1, %2);

would like to optimize it to be:

%1 = relay.take(%0, 0, axis=1, model="wrap");
%3 = relay.multiply(%1, %1);
2

I find that CommonSubexprEliminator pass may be exact what I needed.

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