If my previous post on debugging in TensorBoard piqued your interest, then watch this demo of the TensorFlow Debugger for a deeper look.

If you missed the post, the TensorFlow Debugger is an interactive web GUI for controlling the execution of TensorFlow models, setting breakpoints, stepping through graph nodes, watching tensors flow in real-time, and pinpointing problems down to the tiniest NaN.

This now comes included with TensorBoard via its open plugin API.