Resolve "Ultranest failing"

bilby/core/sampler/ultranest.py

@@ -61,7 +61,7 @@ class Ultranest(NestedSampler):
         log_interval=None,
         dlogz=None,
         max_iters=None,
-        update_interval_iter_fraction=0.2,
+        update_interval_volume_fraction=0.2,
         viz_callback=None,
         dKL=0.5,
         frac_remain=0.01,
@@ -232,7 +232,7 @@ class Ultranest(NestedSampler):
             ]
         else:
             keys = [
-                "update_interval_iter_fraction",
+                "update_interval_volume_fraction",
                 "update_interval_ncall",
                 "log_interval",
                 "show_status",

sampler_requirements.txt

@@ -7,5 +7,5 @@ pymc3==3.6; python_version <= '2.7'
 pymc3>=3.6; python_version > '3.4'
 pymultinest
 kombine
-ultranest>=2.2.1
-dnest4
\ No newline at end of file
+ultranest>=3.0.0
+dnest4

test/core/sampler/ultranest_test.py

@@ -44,7 +44,7 @@ class TestUltranest(unittest.TestCase):
             log_interval=None,
             dlogz=None,
             max_iters=None,
-            update_interval_iter_fraction=0.2,
+            update_interval_volume_fraction=0.2,
             viz_callback=None,
             dKL=0.5,
             frac_remain=0.01,
@@ -79,7 +79,7 @@ class TestUltranest(unittest.TestCase):
             log_interval=None,
             dlogz=None,
             max_iters=None,
-            update_interval_iter_fraction=0.2,
+            update_interval_volume_fraction=0.2,
             viz_callback=None,
             dKL=0.5,
             frac_remain=0.01,