# TensorBoard basic visualizations

This callback writes a log for TensorBoard, which allows you to visualize dynamic graphs of your training and test metrics, as well as activation histograms for the different layers in your model.

callback_tensorboard(
log_dir = NULL,
histogram_freq = 0,
batch_size = NULL,
write_graph = TRUE,
write_images = FALSE,
embeddings_freq = 0,
embeddings_layer_names = NULL,
embeddings_data = NULL,
update_freq = "epoch",
profile_batch = 0
)

## Arguments

 log_dir The path of the directory where to save the log files to be parsed by Tensorboard. The default is NULL, which will use the active run directory (if available) and otherwise will use "logs". histogram_freq frequency (in epochs) at which to compute activation histograms for the layers of the model. If set to 0, histograms won't be computed. batch_size size of batch of inputs to feed to the network for histograms computation. No longer needed, ignored since TF 1.14. write_graph whether to visualize the graph in Tensorboard. The log file can become quite large when write_graph is set to TRUE write_grads whether to visualize gradient histograms in TensorBoard. histogram_freq must be greater than 0. write_images whether to write model weights to visualize as image in Tensorboard. embeddings_freq frequency (in epochs) at which selected embedding layers will be saved. embeddings_layer_names a list of names of layers to keep eye on. If NULL or empty list all the embedding layers will be watched. embeddings_metadata a named list which maps layer name to a file name in which metadata for this embedding layer is saved. See the details about the metadata file format. In case if the same metadata file is used for all embedding layers, string can be passed. embeddings_data Data to be embedded at layers specified in embeddings_layer_names. Array (if the model has a single input) or list of arrays (if the model has multiple inputs). Learn more about embeddings update_freq 'batch' or 'epoch' or integer. When using 'batch', writes the losses and metrics to TensorBoard after each batch. The same applies for 'epoch'. If using an integer, let's say 10000, the callback will write the metrics and losses to TensorBoard every 10000 samples. Note that writing too frequently to TensorBoard can slow down your training. profile_batch Profile the batch to sample compute characteristics. By default, it will disbale profiling. Set profile_batch=2 profile the second batch. Must run in TensorFlow eager mode. (TF >= 1.14)

## Details

TensorBoard is a visualization tool provided with TensorFlow.

When using a backend other than TensorFlow, TensorBoard will still work (if you have TensorFlow installed), but the only feature available will be the display of the losses and metrics plots.

Other callbacks: callback_csv_logger(), callback_early_stopping(), callback_lambda(), callback_learning_rate_scheduler(), callback_model_checkpoint(), callback_progbar_logger(), callback_reduce_lr_on_plateau(), callback_remote_monitor(), callback_terminate_on_naan()