Get started with TensorBoard

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class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p></p>  <div itemscope itemtype="http://developers.google.com/ReferenceObject"> <meta itemprop="name" content="Get started with TensorBoard" /> <meta itemprop="path" content="Guide & Tutorials" /> <meta itemprop="property" content="tf.GradientTape"/> <meta itemprop="property" content="tf.data.Dataset"/> <meta itemprop="property" content="tf.keras.Input"/> <meta itemprop="property" content="tf.keras.Sequential"/> <meta itemprop="property" content="tf.keras.callbacks.TensorBoard"/> <meta itemprop="property" content="tf.keras.layers.Dense"/> <meta itemprop="property" content="tf.keras.layers.Dropout"/> <meta itemprop="property" content="tf.keras.layers.Flatten"/> <meta itemprop="property" content="tf.keras.losses.SparseCategoricalCrossentropy"/> <meta itemprop="property" content="tf.keras.metrics.Mean"/> <meta itemprop="property" content="tf.keras.metrics.SparseCategoricalAccuracy"/> <meta itemprop="property" content="tf.keras.optimizers.Adam"/> <meta itemprop="property" content="tf.summary.create_file_writer"/> <meta itemprop="property" content="tf.summary.scalar"/> </div> <table class="tfo-notebook-buttons" align="left"> <td> <a target="_blank" href="https://www.tensorflow.org/tensorboard/get_started"><img src="https://www.tensorflow.org/images/tf_logo_32px.png">View on TensorFlow.org</a> </td> <td> <a target="_blank" href="https://colab.research.google.com/github/tensorflow/tensorboard/blob/master/docs/get_started.ipynb"><img src="https://www.tensorflow.org/images/colab_logo_32px.png">Run in Google Colab</a> </td> <td> <a target="_blank" href="https://github.com/tensorflow/tensorboard/blob/master/docs/get_started.ipynb"><img src="https://www.tensorflow.org/images/GitHub-Mark-32px.png">View source on GitHub</a> </td> <td> <a href="https://storage.googleapis.com/tensorflow_docs/tensorboard/docs/get_started.ipynb"><img src="https://www.tensorflow.org/images/download_logo_32px.png">Download notebook</a> </td> </table> <p>In machine learning, to improve something you often need to be able to measure it. TensorBoard is a tool for providing the measurements and visualizations needed during the machine learning workflow. It enables tracking experiment metrics like loss and accuracy, visualizing the model graph, projecting embeddings to a lower dimensional space, and much more.</p> <p>This quickstart will show how to quickly get started with TensorBoard. The remaining guides in this website provide more details on specific capabilities, many of which are not included here. </p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr"># Load the TensorBoard notebook extension %load_ext tensorboard </code></pre><pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">import tensorflow as tf import datetime </code></pre> <pre class="prettyprint lang-bsh" translate="no" dir="ltr"> <code class='devsite-terminal' translate="no" dir="ltr"># Clear any logs from previous runs</code> <code class='devsite-terminal' translate="no" dir="ltr">rm -rf ./logs/</code> </pre> <p>Using the <a href="https://en.wikipedia.org/wiki/MNIST_database">MNIST</a> dataset as the example, normalize the data and write a function that creates a simple Keras model for classifying the images into 10 classes.</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">mnist = tf.keras.datasets.mnist (x_train, y_train),(x_test, y_test) = mnist.load_data() x_train, x_test = x_train / 255.0, x_test / 255.0 def create_model(): return tf.keras.models.Sequential([ tf.keras.layers.Input(shape=(28, 28), name='layers_input'), tf.keras.layers.Flatten(name='layers_flatten'), tf.keras.layers.Dense(512, activation='relu', name='layers_dense'), tf.keras.layers.Dropout(0.2, name='layers_dropout'), tf.keras.layers.Dense(10, activation='softmax', name='layers_dense_2') ]) </code></pre> <pre class="tfo-notebook-code-cell-output" translate="no" dir="ltr"> Downloading data from https&colon;//storage.googleapis.com/tensorflow/tf-keras-datasets/mnist.npz 11493376/11490434 [==============================] - 0s 0us/step </pre> <h2 id="using_tensorboard_with_keras_modelfit" data-text="Using TensorBoard with Keras Model.fit()" tabindex="-1">Using TensorBoard with Keras Model.fit()</h2> <p>When training with Keras's <a href="https://www.tensorflow.org/api_docs/python/tf/keras/models/Model#fit">Model.fit()</a>, adding the <a href="https://www.tensorflow.org/api_docs/python/tf/keras/callbacks/TensorBoard"><code translate="no" dir="ltr">tf.keras.callbacks.TensorBoard</code></a> callback ensures that logs are created and stored. Additionally, enable histogram computation every epoch with <code translate="no" dir="ltr">histogram_freq=1</code> (this is off by default)</p> <p>Place the logs in a timestamped subdirectory to allow easy selection of different training runs.</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">model = create_model() model.compile(optimizer='adam', loss='sparse_categorical_crossentropy', metrics=['accuracy']) log_dir = "logs/fit/" + datetime.datetime.now().strftime("%Y%m%d-%H%M%S") tensorboard_callback = tf.keras.callbacks.TensorBoard(log_dir=log_dir, histogram_freq=1) model.fit(x=x_train, y=y_train, epochs=5, validation_data=(x_test, y_test), callbacks=[tensorboard_callback]) </code></pre> <pre class="tfo-notebook-code-cell-output" translate="no" dir="ltr"> Train on 60000 samples, validate on 10000 samples Epoch 1/5 60000/60000 [==============================] - 15s 246us/sample - loss&colon; 0.2217 - accuracy&colon; 0.9343 - val_loss&colon; 0.1019 - val_accuracy&colon; 0.9685 Epoch 2/5 60000/60000 [==============================] - 14s 229us/sample - loss&colon; 0.0975 - accuracy&colon; 0.9698 - val_loss&colon; 0.0787 - val_accuracy&colon; 0.9758 Epoch 3/5 60000/60000 [==============================] - 14s 231us/sample - loss&colon; 0.0718 - accuracy&colon; 0.9771 - val_loss&colon; 0.0698 - val_accuracy&colon; 0.9781 Epoch 4/5 60000/60000 [==============================] - 14s 227us/sample - loss&colon; 0.0540 - accuracy&colon; 0.9820 - val_loss&colon; 0.0685 - val_accuracy&colon; 0.9795 Epoch 5/5 60000/60000 [==============================] - 14s 228us/sample - loss&colon; 0.0433 - accuracy&colon; 0.9862 - val_loss&colon; 0.0623 - val_accuracy&colon; 0.9823 <tensorflow.python.keras.callbacks.History at 0x7fc8a5ee02e8> </pre> <p>Start TensorBoard through the command line or within a notebook experience. The two interfaces are generally the same. In notebooks, use the <code translate="no" dir="ltr">%tensorboard</code> line magic. On the command line, run the same command without "%".</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">%tensorboard --logdir logs/fit </code></pre> <p><img class="tfo-display-only-on-site" src="https://github.com/tensorflow/tensorboard/blob/master/docs/images/quickstart_model_fit.png?raw=1"></p> <p>A brief overview of the visualizations created in this example and the dashboards (tabs in top navigation bar) where they can be found:</p> <ul> <li><strong>Scalars</strong> show how the loss and metrics change with every epoch. You can use them to also track training speed, learning rate, and other scalar values. Scalars can be found in the <strong>Time Series</strong> or <strong>Scalars</strong> dashboards.</li> <li><strong>Graphs</strong> help you visualize your model. In this case, the Keras graph of layers is shown which can help you ensure it is built correctly. Graphs can be found in the <strong>Graphs</strong> dashboard.</li> <li><strong>Histograms</strong> and <strong>Distributions</strong> show the distribution of a Tensor over time. This can be useful to visualize weights and biases and verify that they are changing in an expected way. Histograms can be found in the <strong>Time Series</strong> or <strong>Histograms</strong> dashboards. Distributions can be found in the <strong>Distributions</strong> dashboard.</li> </ul> <p>Additional TensorBoard dashboards are automatically enabled when you log other types of data. For example, the Keras TensorBoard callback lets you log images and embeddings as well. You can see what other dashboards are available in TensorBoard by clicking on the "inactive" dropdown towards the top right.</p> <h2 id="using_tensorboard_with_other_methods" data-text="Using TensorBoard with other methods" tabindex="-1">Using TensorBoard with other methods</h2> <p>When training with methods such as <a href="https://www.tensorflow.org/api_docs/python/tf/GradientTape"><code translate="no" dir="ltr">tf.GradientTape()</code></a>, use <a href="https://www.tensorflow.org/api_docs/python/tf/summary"><code translate="no" dir="ltr">tf.summary</code></a> to log the required information.</p> <p>Use the same dataset as above, but convert it to <a href="https://www.tensorflow.org/api_docs/python/tf/data/Dataset"><code translate="no" dir="ltr">tf.data.Dataset</code></a> to take advantage of batching capabilities:</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">train_dataset = tf.data.Dataset.from_tensor_slices((x_train, y_train)) test_dataset = tf.data.Dataset.from_tensor_slices((x_test, y_test)) train_dataset = train_dataset.shuffle(60000).batch(64) test_dataset = test_dataset.batch(64) </code></pre> <p>The training code follows the <a href="https://www.tensorflow.org/tutorials/quickstart/advanced">advanced quickstart</a> tutorial, but shows how to log metrics to TensorBoard. Choose loss and optimizer:</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">loss_object = tf.keras.losses.SparseCategoricalCrossentropy() optimizer = tf.keras.optimizers.Adam() </code></pre> <p>Create stateful metrics that can be used to accumulate values during training and logged at any point:</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr"># Define our metrics train_loss = tf.keras.metrics.Mean('train_loss', dtype=tf.float32) train_accuracy = tf.keras.metrics.SparseCategoricalAccuracy('train_accuracy') test_loss = tf.keras.metrics.Mean('test_loss', dtype=tf.float32) test_accuracy = tf.keras.metrics.SparseCategoricalAccuracy('test_accuracy') </code></pre> <p>Define the training and test functions:</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">def train_step(model, optimizer, x_train, y_train): with tf.GradientTape() as tape: predictions = model(x_train, training=True) loss = loss_object(y_train, predictions) grads = tape.gradient(loss, model.trainable_variables) optimizer.apply_gradients(zip(grads, model.trainable_variables)) train_loss(loss) train_accuracy(y_train, predictions) def test_step(model, x_test, y_test): predictions = model(x_test) loss = loss_object(y_test, predictions) test_loss(loss) test_accuracy(y_test, predictions) </code></pre> <p>Set up summary writers to write the summaries to disk in a different logs directory:</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">current_time = datetime.datetime.now().strftime("%Y%m%d-%H%M%S") train_log_dir = 'logs/gradient_tape/' + current_time + '/train' test_log_dir = 'logs/gradient_tape/' + current_time + '/test' train_summary_writer = tf.summary.create_file_writer(train_log_dir) test_summary_writer = tf.summary.create_file_writer(test_log_dir) </code></pre> <p>Start training. Use <a href="https://www.tensorflow.org/api_docs/python/tf/summary/scalar"><code translate="no" dir="ltr">tf.summary.scalar()</code></a> to log metrics (loss and accuracy) during training/testing within the scope of the summary writers to write the summaries to disk. You have control over which metrics to log and how often to do it. Other <a href="https://www.tensorflow.org/api_docs/python/tf/summary"><code translate="no" dir="ltr">tf.summary</code></a> functions enable logging other types of data.</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">model = create_model() # reset our model EPOCHS = 5 for epoch in range(EPOCHS): for (x_train, y_train) in train_dataset: train_step(model, optimizer, x_train, y_train) with train_summary_writer.as_default(): tf.summary.scalar('loss', train_loss.result(), step=epoch) tf.summary.scalar('accuracy', train_accuracy.result(), step=epoch) for (x_test, y_test) in test_dataset: test_step(model, x_test, y_test) with test_summary_writer.as_default(): tf.summary.scalar('loss', test_loss.result(), step=epoch) tf.summary.scalar('accuracy', test_accuracy.result(), step=epoch) template = 'Epoch {}, Loss: {}, Accuracy: {}, Test Loss: {}, Test Accuracy: {}' print (template.format(epoch+1, train_loss.result(), train_accuracy.result()*100, test_loss.result(), test_accuracy.result()*100)) # Reset metrics every epoch train_loss.reset_state() test_loss.reset_state() train_accuracy.reset_state() test_accuracy.reset_state() </code></pre> <pre class="tfo-notebook-code-cell-output" translate="no" dir="ltr"> Epoch 1, Loss&colon; 0.24321186542510986, Accuracy&colon; 92.84333801269531, Test Loss&colon; 0.13006582856178284, Test Accuracy&colon; 95.9000015258789 Epoch 2, Loss&colon; 0.10446818172931671, Accuracy&colon; 96.84833526611328, Test Loss&colon; 0.08867532759904861, Test Accuracy&colon; 97.1199951171875 Epoch 3, Loss&colon; 0.07096975296735764, Accuracy&colon; 97.80166625976562, Test Loss&colon; 0.07875105738639832, Test Accuracy&colon; 97.48999786376953 Epoch 4, Loss&colon; 0.05380449816584587, Accuracy&colon; 98.34166717529297, Test Loss&colon; 0.07712937891483307, Test Accuracy&colon; 97.56999969482422 Epoch 5, Loss&colon; 0.041443776339292526, Accuracy&colon; 98.71833038330078, Test Loss&colon; 0.07514958828687668, Test Accuracy&colon; 97.5 </pre> <p>Open TensorBoard again, this time pointing it at the new log directory. We could have also started TensorBoard to monitor training while it progresses.</p> <pre class="prettyprint" translate="no" dir="ltr"><code translate="no" dir="ltr">%tensorboard --logdir logs/gradient_tape </code></pre> <p><img class="tfo-display-only-on-site" src="https://github.com/tensorflow/tensorboard/blob/master/docs/images/quickstart_gradient_tape.png?raw=1"></p> <p>That's it! 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