# Visualizing Training

Visualization is a very important part of training a Deep Neural Network (DNN). Training an DNN involves designing complex neural networks with models having parameters to the tune of millions, and iterating over large datasets. Therefore, understanding how this training progresses over time, visualizing structure of the model graph, and what are the statistics of the model weights are of significant importance.

TAO Toolkit 3.22.05 introduces integration of the following computer vision networks with TensorBoard.

1. DetectNet-v2

2. FasterRCNN

3. Image Classification

5. RetinaNet

6. YOLOv4/YOLOv4-Tiny

7. YOLOv3

9. UNet

10. SSD

11. DSSD

The networks supported in TAO Toolkit supports visualizing

1. Scalar plots such as training loss, validation loss and learning rate

2. Histograms for weights

3. Images

## Enabling Tensorboard during Training

In order to enable tensorboard while training, you can simply add the following spec element to the training_config element of the configuration/experiment spec file.

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visualizer{
enabled: true
}


For detailed information about the configurable elements of the visualizer, please review the table corresponding to the training_config element of the network, in the Creating an Experiment Spec file of the respective network.

## Visualizing using TensorBoard

### Installing tensorboard

• Installing tensorboard is as simple as running a simple pip installation command.

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python -m pip install tensorboard


### Invoking Tensorboard

• Once you have installed tensorboard in your python environment, you may instantiate a tensorboard session by running the following command.

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tensorboard --logdir $RESULTS_DIR --host 0.0.0.0 --port 8080  where $RESULTS_DIR is the path to where the events.out.tfevents.* files are stored from the training experiment.

Note

If you would like to visualize results from multiple experiments side-by-side in a single tensorboard session, you may do so by adding multiple directories to the same tensorboard path, as shown in the command below.

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tensorboard --logdir_spec experiment_name_1:${RESULTS_DIR_1},experiment_name_2:${RESULTS_DIR_2} \
--host 0.0.0.0 --port 8080