presenting the parameter values
until it makes a U-turn, it will be defeated in most cases, as it will
just move down the potential energy valley indefinitely without making
a U-turn. What happens in practice is that the maximum number of
leapfrog steps in the simulation will be hit in many of the
iterations, causing a large number of log probability and
gradient evaluations (1000 if the max tree depth is set to 10, as in
the default). Thus sampling will appear to be slow. This is
indicative of an improper 