Fix ETS refit params (Issue #78). (#79)

* Fix ETS refit params (Issue #78).

* Add apt-get update to CI.

Author: aadyotb

.github/workflows/docs.yml

@@ -23,9 +23,9 @@ jobs:
         python-version: '3.9'
     - name: Install dependencies
       run: |
+        sudo apt-get update -y
+        sudo apt-get install openjdk-11-jre-headless pandoc --fix-missing
         python -m pip install --upgrade pip setuptools wheel
-        sudo apt-get install openjdk-11-jdk
-        sudo apt-get install pandoc
     - name: Build Sphinx docs
       run: |
         docs/build_docs.sh

.github/workflows/tests.yml

@@ -24,9 +24,10 @@ jobs:
 
     - name: Install Merlion
       run: |
+        sudo apt-get update -y
+        sudo apt-get install bc openjdk-11-jre-headless -y --fix-missing
         python -m pip install --upgrade pip setuptools wheel build
         python -m pip install pytest coverage
-        sudo apt-get install bc openjdk-11-jdk
         python -m build
         for f in dist/*.whl; do pip install $f[all]; done
         pip install -e ts_datasets/

merlion/models/forecast/ets.py

@@ -207,7 +207,7 @@ def forecast(
                 val_prev,
                 error=self.error,
                 trend=self.trend,
-                seasonal=self.seasonal,
+                seasonal=None if self.seasonal_periods is None else self.seasonal,
                 damped_trend=self.damped_trend,
                 seasonal_periods=self.seasonal_periods,
             )