To help users understand the structure of their calculator graphs and to understand the overall behavior of their machine learning inference pipelines, we have built the [MediaPipe Visualizer](https://viz.mediapipe.dev/) that is available online. - A graph view allows users to see a connected calculator graph as expressed through a graph configuration that is pasted into the graph editor or uploaded. The user can visualize and troubleshoot a graph they have created.  ## Working within the Editor Getting Started: The graph can be modified by adding and editing code in the Editor view.  - Pressing the "New" button in the upper right corner will clear any existing code in the Editor window.  - Pressing the "Upload" button will prompt the user to select a local PBTXT file, which will overwrite the current code within the editor. - Alternatively, code can be pasted directly into the editor window. - Errors and informational messages will appear in the Feedback window.  ## Understanding the Graph The visualizer graph shows the connections between calculator nodes. - Streams exit from the bottom of the calculator producing the stream and enter the top of any calculator receiving the stream. (Notice the use of the key, "input_stream" and "output_stream").   - Sidepackets work the same, except that they exit a node on the right and enter on the left. (Notice the use of the key, "input_side_packet" and "output_side_packet").   - There are special nodes that represent inputs and outputs to the graph and can supply either side packets or streams.   ## Visualizing Subgraphs The MediaPipe visualizer can display multiple graphs in separate tabs. If a graph has a `type` field in the top level of the graph's text proto definition, and that value of graph `type` is used as a calculator name in another graph, it is considered a subgraph by the visualizer and colored appropriately where it is used. Clicking on a subgraph will navigate to the corresponding tab which holds the subgraph's definition. For instance, there are two graphs involved in MediaPipe Hands: the main graph ([source pbtxt file](https://github.com/google/mediapipe/blob/master/mediapipe/graphs/hand_tracking/hand_detection_mobile.pbtxt)) and its associated subgraph ([source pbtxt file](https://github.com/google/mediapipe/blob/master/mediapipe/graphs/hand_tracking/subgraphs/hand_renderer_gpu.pbtxt)). To visualize them: - In the MediaPipe visualizer, click on the upload graph button and select the 2 pbtxt files to visualize (main graph and its associated subgraph).   - There will be 2 additional tabs. The main graph tab is `hand_detection_mobile.pbtxt`.  - Clicking on the `HandDetection` node in purple redirects the view to the `hand_detection_gpu.pbtxt` tab.