From 696a2f6ea9862b6ba68dd2353afc23230feef138 Mon Sep 17 00:00:00 2001
From: Dom Morgan <dom@d3r.com>
Date: Thu, 23 May 2024 18:23:20 +0100
Subject: [PATCH] Do not allow zero local reachability density in
 LocalOutlierFactor (#335)

See https://github.com/RubixML/ML/issues/334
---
 src/AnomalyDetectors/LocalOutlierFactor.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/AnomalyDetectors/LocalOutlierFactor.php b/src/AnomalyDetectors/LocalOutlierFactor.php
index 91e42869f..edb0638ae 100644
--- a/src/AnomalyDetectors/LocalOutlierFactor.php
+++ b/src/AnomalyDetectors/LocalOutlierFactor.php
@@ -287,7 +287,7 @@ protected function localOutlierFactor(array $sample) : float
     {
         [$samples, $indices, $distances] = $this->tree->nearest($sample, $this->k);
 
-        $lrd = $this->localReachabilityDensity($indices, $distances);
+        $lrd = $this->localReachabilityDensity($indices, $distances) ?: EPSILON;
 
         $ratios = [];