Program the softmax model of Jags-Ynom-XmetMulti-Msoftmax.R in Stan. (Ever notice how the exercises that take the fewest words to state take the most hours to do?) Note that Stan has a softmax...

Program the softmax model of Jags-Ynom-XmetMulti-Msoftmax.R in Stan. (Ever notice how the exercises that take the fewest words to state take the most hours to do?) Note that Stan has a softmax function built in; see the Stan reference manual. Run it on the data of Figure 22.1 (and check that it gets the same results as the JAGS model). Compare the real time it takes to generate a result with the same ESS as JAGS.