Update 2021JUN20.md

2021JUN20.md

@@ -110,3 +110,4 @@ The low quality coefficients have similar spike-and-slab priors to enforce spars
 ```math
 P(\mathbf{U}|\mathbf{t}, \mathbf{H}^{L}, \mathbf{w}, \beta_1,...\beta_d) \propto P(\mathbf{t}|\mathbf{X}^{L},\mathbf{U}, \mathbf{w})P(\mathbf{U} | \mathbf{w}, \beta_1,...\beta_d)
 ```
+where $`P(\mathbf{t}|\mathbf{X}^{L},\mathbf{U}, \mathbf{w}) = \sigma(\mathbf{X}^{L}\mathbf{Uw})`$ and $`P(\mathbf{U} | \mathbf{w}, \beta_1,...\beta_d) = \mathcal{N}(\mathbf{UW} | \mathbf{0}, \text{diag}(\beta_1,...\beta_d))`$, s.t. $`\mathbf{U}^{T}\mathbf{U} = \mathbf{I}`$.