Merge pull request #732 from pymc-devs/rank-to-ndim

Replace numpy.rank with numpy.ndim

Author: jsalvatier

pymc3/diagnostics.py

@@ -50,7 +50,7 @@ def geweke(x, first=.1, last=.5, intervals=20):
     Geweke (1992)
     """
 
-    if np.rank(x) > 1:
+    if np.ndim(x) > 1:
         return [geweke(y, first, last, intervals) for y in np.transpose(x)]
 
     # Filter out invalid intervals