Install virtualenv only if missing

Author: danielhers

experiments/acl2017.sh

@@ -11,9 +11,10 @@ set -e
 # }
 mkdir -p hershcovich2017a
 cd hershcovich2017a
-pip install --user virtualenv
-python -m virtualenv --python=/usr/bin/python3 venv
-. venv/bin/activate              # on bash
+if python -m virtualenv --version || pip install --user virtualenv; then
+    python -m virtualenv --python=/usr/bin/python3 venv
+    . venv/bin/activate              # on bash
+fi
 pip install "tupa>=1.0,<1.1"
 git clone https://github.com/huji-nlp/ucca-corpora --branch v1.2
 mkdir -p models wiki-sentences 20k-sentences

experiments/acl2018.sh

@@ -11,9 +11,10 @@ set -e
 # }
 mkdir -p hershcovich2018multitask
 cd hershcovich2018multitask
-pip install --user virtualenv
-python -m virtualenv --python=/usr/bin/python3 venv
-. venv/bin/activate              # on bash
+if python -m virtualenv --version || pip install --user virtualenv; then
+    python -m virtualenv --python=/usr/bin/python3 venv
+    . venv/bin/activate              # on bash
+fi
 pip install "tupa==1.3.2"
 git clone https://github.com/huji-nlp/ucca-corpora --branch v1.2
 mkdir -p models wiki-sentences 20k{,-fr,-de}-sentences