Pin Matplotlib < 3.1.1 to avoid mutiprocessing MacOS error

RELEASE-NOTES.md

@@ -27,7 +27,8 @@
 - Moved argument division out of `NegativeBinomial` `random` method. Fixes [#3864](https://github.com/pymc-devs/pymc3/issues/3864) in the style of [#3509](https://github.com/pymc-devs/pymc3/pull/3509).
 - The Dirichlet distribution now raises a ValueError when it's initialized with <= 0 values (see [#3853](https://github.com/pymc-devs/pymc3/pull/3853)).
 - End of sampling report now uses `arviz.InferenceData` internally and avoids storing
-  pointwise log likelihood (see [#3883](https://github.com/pymc-devs/pymc3/pull/3883))
+  pointwise log likelihood (see [#3883](https://github.com/pymc-devs/pymc3/pull/3883)).
+- To avoid crashing multiprocessing on MacOS, matplotlib dependency is pinned to versions < 3.1.1 until [the issue](https://github.com/matplotlib/matplotlib/issues/15410) is resolved (see [#3849](https://github.com/pymc-devs/pymc3/issues/3849)).
 
 ## PyMC3 3.8 (November 29 2019)
 

requirements.txt

@@ -1,10 +1,11 @@
 arviz>=0.7.0
-theano>=1.0.4
+fastprogress>=0.2.0
+h5py>=2.7.0
+matplotlib==3.1.0
 numpy>=1.13.0
-scipy>=0.18.1
 pandas>=0.18.0
 patsy>=0.5.1
-fastprogress>=0.2.0
-h5py>=2.7.0
+scipy>=0.18.1
+theano>=1.0.4
 typing-extensions>=3.7.4
 contextvars; python_version < '3.7'

scripts/create_testenv.sh

@@ -2,44 +2,45 @@
 
 set -ex # fail on first error, print commands
 
-while test $# -gt 0
-do
-    case "$1" in
-        --global)
-            GLOBAL=1
-            ;;
-        --no-setup)
-            NO_SETUP=1
-            ;;
-    esac
-    shift
+while test $# -gt 0; do
+  case "$1" in
+  --global)
+    GLOBAL=1
+    ;;
+  --no-setup)
+    NO_SETUP=1
+    ;;
+  esac
+  shift
 done
 
 command -v conda >/dev/null 2>&1 || {
-  echo "Requires conda but it is not installed.  Run install_miniconda.sh." >&2;
-  exit 1;
+  echo "Requires conda but it is not installed.  Run install_miniconda.sh." >&2
+  exit 1
 }
 
-ENVNAME="${ENVNAME:-testenv}" # if no ENVNAME is specified, use testenv
+ENVNAME="${ENVNAME:-testenv}"         # if no ENVNAME is specified, use testenv
 PYTHON_VERSION=${PYTHON_VERSION:-3.6} # if no python specified, use 3.6
 
-if [ -z ${GLOBAL} ]
-then
-    if conda env list | grep -q ${ENVNAME}
-    then
-      echo "Environment ${ENVNAME} already exists, keeping up to date"
-    else
-      conda create -n ${ENVNAME} --yes pip python=${PYTHON_VERSION}
-    fi
-    source activate ${ENVNAME}
+if [ -z ${GLOBAL} ]; then
+  if conda env list | grep -q ${ENVNAME}; then
+    echo "Environment ${ENVNAME} already exists, keeping up to date"
+  else
+    conda create -n ${ENVNAME} --yes pip python=${PYTHON_VERSION}
+  fi
+  source activate ${ENVNAME}
 fi
 pip install --upgrade pip
 
 conda install --yes mkl-service
 conda install --yes -c conda-forge python-graphviz
 
-
-#  Install editable using the setup.py
+# Uninstall the three matplotlibs present on conda env
+pip uninstall matplotlib --yes
+pip uninstall matplotlib --yes
+pip uninstall matplotlib --yes
+# Pin matplotlib until https://github.com/matplotlib/matplotlib/issues/15410 is resolved
+pip install --force-reinstall "matplotlib==3.1.0"
 
 # Travis env is unable to import cached mpl sometimes https://github.com/pymc-devs/pymc3/issues/3423
 pip install --no-cache-dir --ignore-installed -e .
@@ -48,6 +49,7 @@ pip install --no-cache-dir --ignore-installed -r requirements-dev.txt
 # Install untested, non-required code (linter fails without them)
 pip install ipython ipywidgets
 
+#  Install editable using the setup.py
 if [ -z ${NO_SETUP} ]; then
-    python setup.py build_ext --inplace
+  python setup.py build_ext --inplace
 fi