From 324ffe5e66d94259322960bf390f7665a435b982 Mon Sep 17 00:00:00 2001
From: Johannes Buchner <johannes.buchner.acad@gmx.com>
Date: Fri, 3 Sep 2021 13:15:23 +0200
Subject: [PATCH] give debug warnings when handling for plateaus and linearly
 dependent situations

---
 ultranest/integrator.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ultranest/integrator.py b/ultranest/integrator.py
index a8c83c64..f8b69bbc 100644
--- a/ultranest/integrator.py
+++ b/ultranest/integrator.py
@@ -2020,6 +2020,8 @@ def _should_node_be_expanded(
             return False
 
         if not live_points_healthy:
+            if self.log:
+                self.logger.debug("not expanding, because live points are linearly dependent")
             return False
 
         # some reasons to stop:
@@ -2034,6 +2036,8 @@ def _should_node_be_expanded(
 
         # in a plateau, only shrink (Fowlie+2020)
         if (Lmin == parallel_values).sum() > 1:
+            if self.log:
+                self.logger.debug("Plateau detected at L=%e, not replacing live point." % Lmin)
             return False
 
         expand_node = False