Use research url for colab

samples/core/get_started/_index.ipynb

@@ -70,7 +70,7 @@
       "cell_type": "markdown",
       "source": [
         "<table class=\"tfo-notebook-buttons\" align=\"left\"><td>\n",
-        "<a target=\"_blank\"  href=\"https://colab.sandbox.google.com/github/tensorflow/models/blob/master/samples/core/get_started/_index.ipynb\">\n",
+        "<a target=\"_blank\"  href=\"https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/_index.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" /><span>Run in Google Colab</span></a>  \n",
         "</td><td>\n",
         "<a target=\"_blank\"  href=\"https://github.com/tensorflow/models/blob/master/samples/core/get_started/_index.ipynb\"><img width=32px src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" /><span>View source on GitHub</span></a></td></table>"
@@ -83,7 +83,7 @@
       },
       "cell_type": "markdown",
       "source": [
-        "This is a [Google Colaboratory](https://colab.sandbox.google.com/notebooks/welcome.ipynb) notebook file. Python programs are run directly in the browser—a great way to learn and use TensorFlow. To run the Colab notebook:\n",
+        "This is a [Google Colaboratory](https://colab.research.google.com/notebooks/welcome.ipynb) notebook file. Python programs are run directly in the browser—a great way to learn and use TensorFlow. To run the Colab notebook:\n",
         "\n",
         "1. Connect to a Python runtime: At the top-right of the menu bar, select *CONNECT*.\n",
         "2. Run all the notebook code cells: Select *Runtime* > *Run all*.\n",

samples/core/get_started/basic_classification.ipynb

@@ -114,7 +114,7 @@
       "cell_type": "markdown",
       "source": [
         "<table class=\"tfo-notebook-buttons\" align=\"left\"><td>\n",
-        "<a target=\"_blank\"  href=\"https://colab.sandbox.google.com/github/tensorflow/models/blob/master/samples/core/get_started/basic_classification.ipynb\">\n",
+        "<a target=\"_blank\"  href=\"https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/basic_classification.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" /><span>Run in Google Colab</span></a>  \n",
         "</td><td>\n",
         "<a target=\"_blank\"  href=\"https://github.com/tensorflow/models/blob/master/samples/core/get_started/basic_classification.ipynb\"><img width=32px src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" /><span>View source on GitHub</span></a></td></table>\n"

samples/core/get_started/basic_regression.ipynb

@@ -102,7 +102,7 @@
       "cell_type": "markdown",
       "source": [
         "<table class=\"tfo-notebook-buttons\" align=\"left\"><td>\n",
-        "<a target=\"_blank\"  href=\"https://colab.sandbox.google.com/github/tensorflow/models/blob/master/samples/core/get_started/basic_regression.ipynb\">\n",
+        "<a target=\"_blank\"  href=\"https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/basic_regression.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" /><span>Run in Google Colab</span></a>  \n",
         "</td><td>\n",
         "<a target=\"_blank\"  href=\"https://github.com/tensorflow/models/blob/master/samples/core/get_started/basic_regression.ipynb\"><img width=32px src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" /><span>View source on GitHub</span></a></td></table>"

samples/core/get_started/basic_text_classification.ipynb

@@ -100,7 +100,7 @@
       "cell_type": "markdown",
       "source": [
         "<table class=\"tfo-notebook-buttons\" align=\"left\"><td>\n",
-        "<a target=\"_blank\"  href=\"https://colab.sandbox.google.com/github/tensorflow/models/blob/master/samples/core/get_started/basic_text_classification.ipynb\">\n",
+        "<a target=\"_blank\"  href=\"https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/basic_text_classification.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" /><span>Run in Google Colab</span></a>  \n",
         "</td><td>\n",
         "<a target=\"_blank\"  href=\"https://github.com/tensorflow/models/blob/master/samples/core/get_started/basic_text_classification.ipynb\"><img width=32px src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" /><span>View source on GitHub</span></a></td></table>"

samples/core/get_started/eager.ipynb

@@ -69,7 +69,7 @@
         "# Custom training: walkthrough\n",
         "\n",
         "<table class=\"tfo-notebook-buttons\" align=\"left\"><td>\n",
-        "<a target=\"_blank\"  href=\"https://colab.sandbox.google.com/github/tensorflow/models/blob/master/samples/core/get_started/eager.ipynb\">\n",
+        "<a target=\"_blank\"  href=\"https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/eager.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" /><span>Run in Google Colab</span></a>  \n",
         "</td><td>\n",
         "<a target=\"_blank\"  href=\"https://github.com/tensorflow/models/blob/master/samples/core/get_started/eager.ipynb\"><img width=32px src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" /><span>View source on GitHub</span></a></td></table>"

samples/core/get_started/overfit_and_underfit.ipynb

@@ -117,7 +117,7 @@
       "cell_type": "markdown",
       "source": [
         "<table class=\"tfo-notebook-buttons\" align=\"left\"><td>\n",
-        "<a target=\"_blank\"  href=\"https://colab.sandbox.google.com/github/tensorflow/models/blob/master/samples/core/get_started/overfit_and_underfit.ipynb\">\n",
+        "<a target=\"_blank\"  href=\"https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/overfit_and_underfit.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" /><span>Run in Google Colab</span></a>  \n",
         "</td><td>\n",
         "<a target=\"_blank\"  href=\"https://github.com/tensorflow/models/blob/master/samples/core/get_started/overfit_and_underfit.ipynb\"><img width=32px src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" /><span>View source on GitHub</span></a></td></table>"

samples/core/get_started/save_and_restore_models.ipynb

@@ -95,7 +95,7 @@
         "# Save and restore models\n",
         "\n",
         "<table class=\"tfo-notebook-buttons\" align=\"left\"><td>\n",
-        "<a target=\"_blank\"  href=\"https://colab.sandbox.google.com/github/tensorflow/models/blob/master/samples/core/get_started/save_and_restore_models.ipynb\">\n",
+        "<a target=\"_blank\"  href=\"https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/save_and_restore_models.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" /><span>Run in Google Colab</span></a>  \n",
         "</td><td>\n",
         "<a target=\"_blank\"  href=\"https://github.com/tensorflow/models/blob/master/samples/core/get_started/save_and_restore_models.ipynb\"><img width=32px src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" /><span>View source on GitHub</span></a></td></table>\n"