added response to question- can bokeh use a GPU? Yes!

Author: surfaceowl

notebooks/SF_Python_Lightning_Talk.2020_Apr.ipynb

@@ -2133,12 +2133,54 @@
    "source": [
     "# [Happy Birthday Python 3!](https://www.python.org/download/releases/3.0/)<br>\n",
     "\n",
-    "### (technically yesterday - 3 Dec)\n",
+    "### (technically last year - 3 Dec)\n",
     "<br>\n",
     "\n",
     "<img src=\"images/python-logo-master-v3-TM.png\" alt=\"Python Official Logo\" title=\"Python Official Logo\" style=\"float:center; height:400%\"/>"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "# Audience Question: Can Bokeh use GPU?\n",
+    "\n",
+    "# Updated response:  Yes - Bokeh can leverage the GPU with release 2.0.1 on 2020.03.31\n",
+    "# example from this page: https://docs.bokeh.org/en/latest/docs/user_guide/webgl.html\n",
+    "\n",
+    "# setup a lot of points to graph\n",
+    "import numpy as np\n",
+    "\n",
+    "from bokeh.plotting import figure, show, output_file\n",
+    "\n",
+    "N = 10000\n",
+    "\n",
+    "x = np.random.normal(0, np.pi, N)\n",
+    "y = np.sin(x) + np.random.normal(0, 0.2, N)\n",
+    "\n",
+    "# run without webGL\n",
+    "output_file(\"scatter10k.html\", title=\"scatter 10k points (no WebGL)\")\n",
+    "\n",
+    "p = figure(output_backend=\"canvas\")\n",
+    "p.scatter(x, y, alpha=0.1)\n",
+    "show(p)\n",
+    "\n",
+    "# run with webGL\n",
+    "output_file(\"scatter10k.html\", title=\"scatter 10k points (with WebGL)\")\n",
+    "\n",
+    "p = figure(output_backend=\"webgl\")\n",
+    "p.scatter(x, y, alpha=0.1)\n",
+    "show(p)\n",
+    "\n",
+    "# for fun - create a timing decorator, and run both of these on a machine with a GPU, some new cells comparing runtimes "
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {