change copyrights, address graphviz issue

Author: jphall663

debugging_resid_analysis_redux.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2019 Patrick Hall and the H2O.ai team\n",
+    "Copyright 2019-2020 Patrick Hall and the H2O.ai team\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -5019,6 +5019,8 @@
     "    print()\n",
     "    print('Calling external process ...')\n",
     "    print(' '.join(gv_args))\n",
+    "    # if the line below is failing for you, try instead:\n",
+    "    # _ = subprocess.call(gv_args, shell=True)\n",
     "    _ = subprocess.call(gv_args)\n",
     "\n",
     "################################################################################\n",
@@ -5043,6 +5045,8 @@
     "    # call \n",
     "    print('Calling external process ...')\n",
     "    print(' '.join(png_args))\n",
+    "    # if the line below is failing for you, try instead:\n",
+    "    # _ = subprocess.call(png_args, shell=True)    \n",
     "    _ = subprocess.call(png_args)\n",
     "    "
    ]
@@ -5556,7 +5560,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,

debugging_sens_analysis_redux.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2019 Patrick Hall and the H2O.ai team\n",
+    "Copyright 2019-2020 Patrick Hall and the H2O.ai team\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -4845,7 +4845,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,

dia.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2019 Patrick Hall and the H2O.ai team\n",
+    "Copyright 2019-2020 Patrick Hall and the H2O.ai team\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -4475,7 +4475,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,

dt_surrogate_loco.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2017 - 2019 Patrick Hall and the H2O.ai team\n",
+    "Copyright 2017 - 2020 Patrick Hall and the H2O.ai team\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -651,6 +651,8 @@
     "print()\n",
     "print('Calling external process ...')\n",
     "print(' '.join(gv_args))\n",
+    "# if the line below is failing for you, try instead:\n",
+    "# _ = subprocess.call(png_args, shell=True)  \n",
     "_ = subprocess.call(gv_args)"
    ]
   },
@@ -1983,7 +1985,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,

lime.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2017 - 2019 Patrick Hall and the H2O.ai team\n",
+    "Copyright 2017 - 2020 Patrick Hall and the H2O.ai team\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -1471,7 +1471,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,

resid_sens_analysis.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2017 - 2019 Patrick Hall and the H2O.ai team\n",
+    "Copyright 2017 - 2020 Patrick Hall and the H2O.ai team\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -3818,7 +3818,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,

xgboost_pdp_ice.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## License \n",
     "\n",
-    "Copyright 2017 - 2019 Patrick Hall and the H2O.ai team\n",
+    "Copyright 2017 - 2020 Patrick Hall and the H2O.ai team\n",
     "\n",
     "Licensed under the Apache License, Version 2.0 (the \"License\");\n",
     "you may not use this file except in compliance with the License.\n",
@@ -2547,7 +2547,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,