02_tensorflow_from_video.ipynb

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    "colab": {
      "name": "_index.ipynb",
      "version": "0.3.2",
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      "private_outputs": true,
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    "kernelspec": {
      "display_name": "Python 3",
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  "cells": [
    {
      "metadata": {
        "colab_type": "text",
        "id": "rX8mhOLljYeM"
      },
      "cell_type": "markdown",
      "source": [
        "##### Copyright 2018 The TensorFlow Authors.\n",
        "\n",
        "Licensed under the Apache License, Version 2.0 (the \"License\");"
      ]
    },
    {
      "metadata": {
        "cellView": "form",
        "colab_type": "code",
        "id": "BZSlp3DAjdYf",
        "colab": {}
      },
      "cell_type": "code",
      "source": [
        "#@title Licensed under the Apache License, Version 2.0 (the \"License\");\n",
        "# you may not use this file except in compliance with the License.\n",
        "# You may obtain a copy of the License at\n",
        "#\n",
        "# https://www.apache.org/licenses/LICENSE-2.0\n",
        "#\n",
        "# Unless required by applicable law or agreed to in writing, software\n",
        "# distributed under the License is distributed on an \"AS IS\" BASIS,\n",
        "# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
        "# See the License for the specific language governing permissions and\n",
        "# limitations under the License."
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "metadata": {
        "colab_type": "text",
        "id": "3wF5wszaj97Y"
      },
      "cell_type": "markdown",
      "source": [
        "# Get Started with TensorFlow"
      ]
    },
    {
      "metadata": {
        "colab_type": "text",
        "id": "DUNzJc4jTj6G"
      },
      "cell_type": "markdown",
      "source": [
        "<table class=\"tfo-notebook-buttons\" align=\"left\">\n",
        "  <td>\n",
        "    <a target=\"_blank\" href=\"https://www.tensorflow.org/tutorials/\"><img src=\"https://www.tensorflow.org/images/tf_logo_32px.png\" />View on TensorFlow.org</a>\n",
        "  </td>\n",
        "  <td>\n",
        "    <a target=\"_blank\" href=\"https://colab.research.google.com/github/tensorflow/docs/blob/master/site/en/tutorials/_index.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" />Run in Google Colab</a>\n",
        "  </td>\n",
        "  <td>\n",
        "    <a target=\"_blank\" href=\"https://github.com/tensorflow/docs/blob/master/site/en/tutorials/_index.ipynb\"><img src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" />View source on GitHub</a>\n",
        "  </td>\n",
        "</table>"
      ]
    },
    {
      "metadata": {
        "colab_type": "text",
        "id": "hiH7AC-NTniF"
      },
      "cell_type": "markdown",
      "source": [
        "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",
        "\n",
        "For more examples and guides (including details for this program), see [Get Started with TensorFlow](https://www.tensorflow.org/get_started/).\n",
        "\n",
        "Let's get started, import the TensorFlow library into your program:"
      ]
    },
    {
      "metadata": {
        "colab_type": "code",
        "id": "0trJmd6DjqBZ",
        "colab": {}
      },
      "cell_type": "code",
      "source": [
        "import tensorflow as tf"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "metadata": {
        "colab_type": "text",
        "id": "7NAbSZiaoJ4z"
      },
      "cell_type": "markdown",
      "source": [
        "Load and prepare the [MNIST](http://yann.lecun.com/exdb/mnist/) dataset. Convert the samples from integers to floating-point numbers:"
      ]
    },
    {
      "metadata": {
        "colab_type": "code",
        "id": "7FP5258xjs-v",
        "colab": {}
      },
      "cell_type": "code",
      "source": [
        "mnist = tf.keras.datasets.mnist\n",
        "\n",
        "(x_train, y_train), (x_test, y_test) = mnist.load_data()\n",
        "x_train, x_test = x_train / 255.0, x_test / 255.0"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "metadata": {
        "colab_type": "text",
        "id": "BPZ68wASog_I"
      },
      "cell_type": "markdown",
      "source": [
        "Build the `tf.keras` model by stacking layers. Select an optimizer and loss function used for training:"
      ]
    },
    {
      "metadata": {
        "colab_type": "code",
        "id": "h3IKyzTCDNGo",
        "colab": {}
      },
      "cell_type": "code",
      "source": [
        "model = tf.keras.models.Sequential([\n",
        "  tf.keras.layers.Flatten(input_shape=(28, 28)),\n",
        "  tf.keras.layers.Dense(512, activation=tf.nn.relu),\n",
        "  tf.keras.layers.Dropout(0.2),\n",
        "  tf.keras.layers.Dense(10, activation=tf.nn.softmax)\n",
        "])\n",
        "\n",
        "model.compile(optimizer='adam',\n",
        "              loss='sparse_categorical_crossentropy',\n",
        "              metrics=['accuracy'])"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "metadata": {
        "colab_type": "text",
        "id": "ix4mEL65on-w"
      },
      "cell_type": "markdown",
      "source": [
        "Train and evaluate model:"
      ]
    },
    {
      "metadata": {
        "colab_type": "code",
        "id": "F7dTAzgHDUh7",
        "colab": {}
      },
      "cell_type": "code",
      "source": [
        "model.fit(x_train, y_train, epochs=5)\n",
        "\n",
        "model.evaluate(x_test, y_test)"
      ],
      "execution_count": 0,
      "outputs": []
    },
    {
      "metadata": {
        "colab_type": "text",
        "id": "T4JfEh7kvx6m"
      },
      "cell_type": "markdown",
      "source": [
        "You’ve now trained an image classifier with ~98% accuracy on this dataset. See [Get Started with TensorFlow](https://www.tensorflow.org/get_started/) to learn more."
      ]
    }
  ]
}