Question: With secure multiparty computation methods (i.e., using cryptography), do you think efficiency is more of a problem with horizontally partitioned data or with vertically partitioned

With secure multiparty computation methods (i.e., using cryptography), do you think efficiency is more of a problem with horizontally partitioned data or with vertically partitioned data? Can approximation of the function (i.e., not computing the exact value, but rather just an approximate) help with efficiency?

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