Error Immune Logic for Low-Power Probabilistic Computing

Figure 5

This circuit illustrates the definitions for $ϵ$ and $\delta$. Symbol $ϵ$ is the error probability for a node and $\delta$ is the probability that a network of gates is erroneous. For a single gate, $\delta$ is the error probability of that gate inclusive of the fact that the inputs may be erroneous. Each gate is represented by a matrix and the matrices from each level of the circuit are multiplied to get the final PTM.