this may address nicole's import error.

hard for me to test, though

Author: kbarnhart

lithology/introduction_to_lithology.ipynb

@@ -32,6 +32,10 @@
     "import numpy as np\n",
     "import xarray as xr\n",
     "import dask\n",
+    "\n",
+    "import matplotlib\n",
+    "matplotlib.use('Agg')\n",
+    "import matplotlib.pyplot as plt\n",
     "%matplotlib inline\n",
     "\n",
     "import holoviews as hv\n",
@@ -261,9 +265,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "imshow_grid(mg, 'topographic__elevation', cmap='viridis')"
@@ -283,9 +285,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "hvds_topo = hv.Dataset(ds.topographic__elevation)\n",
@@ -305,9 +305,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "%opts Image style(interpolation='bilinear', cmap='viridis') plot[colorbar=True]\n",
@@ -427,9 +425,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "imshow_grid(mg2, 'topographic__elevation', cmap='viridis')"
@@ -447,9 +443,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "volcanic_deposits = np.zeros(mg2.size('node'))\n",
@@ -505,7 +499,6 @@
    "cell_type": "code",
    "execution_count": null,
    "metadata": {
-    "collapsed": true,
     "scrolled": true
    },
    "outputs": [],