Use compact traceplot by default (#3502)

* Use compact traceplot by default

* Protect against old values of arviz

pymc3/plots/__init__.py

@@ -47,11 +47,21 @@ def wrapped(*args, **kwargs):
 forestplot = map_args(az.plot_forest)
 kdeplot = map_args(az.plot_kde)
 plot_posterior = map_args(az.plot_posterior)
-traceplot = map_args(az.plot_trace)
 energyplot = map_args(az.plot_energy)
 densityplot = map_args(az.plot_density)
 pairplot = map_args(az.plot_pair)
 
+# Use compact traceplot by default
+@map_args
+@functools.wraps(az.plot_trace)
+def traceplot(*args, **kwargs):
+    try:
+        kwargs.setdefault('compact', True)
+        return az.plot_trace(*args, **kwargs)
+    except TypeError:
+        kwargs.pop('compact')
+        return az.plot_trace(*args, **kwargs)
+
 # addition arg mapping for compare plot
 @functools.wraps(az.plot_compare)
 def compareplot(*args, **kwargs):