From 513b9d38e560b7e8904604c61985337cbef5c33a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Merc=C3=A8=20Mart=C3=ADn=20Prats?= <merce@bigml.com>
Date: Wed, 10 Jun 2020 18:13:32 +0200
Subject: [PATCH] Fixing corner case in local anomaly detectors trained with
 one row

---
 HISTORY.rst      | 6 ++++++
 bigml/anomaly.py | 8 +++++---
 bigml/version.py | 2 +-
 docs/index.rst   | 1 +
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index 8cc466e6..8d29930a 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,6 +3,12 @@
 History
 -------
 
+4.32.1 (2020-06-10)
+~~~~~~~~~~~~~~~~~~~
+
+- Fixing local anomaly scores prediction for corner cases of samples with
+  one row.
+
 4.32.0 (2020-05-19)
 ~~~~~~~~~~~~~~~~~~~
 
diff --git a/bigml/anomaly.py b/bigml/anomaly.py
index a581b4be..5d233efc 100644
--- a/bigml/anomaly.py
+++ b/bigml/anomaly.py
@@ -96,8 +96,8 @@ def __init__(self, anomaly, api=None):
                                         "Score will"
                                         " not be available")
                     else:
-                        default_depth = (
-                            2 * (DEPTH_FACTOR + \
+                        default_depth = self.mean_depth if \
+                            self.sample_size == 1 else (2 * (DEPTH_FACTOR + \
                             math.log(self.sample_size - 1) - \
                             (float(self.sample_size - 1) / self.sample_size)))
                         self.expected_mean_depth = min(self.mean_depth,
@@ -128,7 +128,9 @@ def anomaly_score(self, input_data):
             value between 0 and 1.
 
         """
-
+        # corner case with only one record
+        if self.sample_size == 1:
+            return 1
         # Checks and cleans input_data leaving the fields used in the model
         input_data = self.filter_input_data(input_data)
 
diff --git a/bigml/version.py b/bigml/version.py
index 3ce709a9..52e71aee 100644
--- a/bigml/version.py
+++ b/bigml/version.py
@@ -1 +1 @@
-__version__ = '4.32.0'
+__version__ = '4.32.1'
diff --git a/docs/index.rst b/docs/index.rst
index 3c23331a..39f522e4 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1,6 +1,7 @@
 .. toctree::
    :hidden:
 
+   index
    ml_resources
    creating_resources
    101_model