From 5d9daa154178b7e89b9b3c0dc6149fa595c52497 Mon Sep 17 00:00:00 2001
From: Jasper Schulz <schjaspe@amazon.de>
Date: Mon, 13 Jul 2020 19:26:24 +0200
Subject: [PATCH] Defaulting MSIS to NaN when it can't be calculated.

---
 src/gluonts/evaluation/_base.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/gluonts/evaluation/_base.py b/src/gluonts/evaluation/_base.py
index 574f900e3d..cdf442b78c 100644
--- a/src/gluonts/evaluation/_base.py
+++ b/src/gluonts/evaluation/_base.py
@@ -319,14 +319,19 @@ def get_metrics_per_ts(
             "MAPE": self.mape(pred_target, median_fcst),
             "sMAPE": self.smape(pred_target, median_fcst),
             "OWA": np.nan,  # by default not calculated
-            "MSIS": self.msis(
+        }
+
+        try:
+            metrics["MSIS"] = self.msis(
                 pred_target,
                 forecast.quantile(self.alpha / 2),
                 forecast.quantile(1.0 - self.alpha / 2),
                 seasonal_error,
                 self.alpha,
-            ),
-        }
+            )
+        except Exception:
+            logging.warning("Could not calculate MSIS metric.")
+            metrics["MSIS"] = np.nan
 
         if self.calculate_owa:
             metrics["OWA"] = self.owa(