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dag

Visualize pipelines as one or more stage dependency graphs.

Synopsis

usage: dvc dag [-h] [-q | -v] [-o] [--full]
               [--md] [--mermaid] [--dot]
               [target]

positional arguments:
  target          Stage or output to show pipeline for (optional)
                  Uses all stages in the workspace by default.

Description

DVC represents a pipeline internally as a Directed Acyclic Graph (DAG) where the nodes are stages and the edges are dependencies.

dvc dag displays this dependency graph in one or more pipelines, as defined in the dvc.yaml files found in the project. Provide a target stage name to show the pipeline up to that point.

Paginating the output

This command's output is automatically piped to less if available in the terminal (the exact command used is less --chop-long-lines --clear-screen). If less is not available (e.g. on Windows), the output is simply printed out.

It's also possible to enable less on Windows.

Note that this also applies to dvc exp show.

Providing a custom pager

It's possible to override the default pager via the DVC_PAGER environment variable. Set it to a program found in PATH or give a full path to it. For example on Linux shell:

$ DVC_PAGER=more dvc exp show  # Use more as pager once.
...

$ export DVC_PAGER=more  # Set more as pager for all commands.
$ dvc exp show ...

For a persistent change, set DVC_PAGER in the shell configuration, for example in ~/.bashrc for Bash.

Options

  • -o, --outs - show a DAG of chained dependencies and outputs instead of the stages themselves. The graph may be significantly different.

  • --full - show full DAG that the target stage belongs to, instead of showing only its ancestors.

  • --md - show DAG in --mermaid format, wrapped inside a Markdown fenced code block.

    This can be used to combine dvc dag with cml send-comment

  • --mermaid - show DAG in Mermaid format. It can be passed to third party visualization utilities.

  • --dot - show DAG in DOT format. It can be passed to third party visualization utilities.

  • -h, --help - prints the usage/help message, and exit.

  • -q, --quiet - do not write anything to standard output. Exit with 0 if no problems arise, otherwise 1.

  • -v, --verbose - displays detailed tracing information.

Example: Visualize a DVC Pipeline

Visualize the prepare, featurize, train, and evaluate stages of a pipeline as defined in dvc.yaml:

$ dvc dag
         +---------+
         | prepare |
         +---------+
              *
              *
              *
        +-----------+
        | featurize |
        +-----------+
         **        **
       **            *
      *               **
+-------+               *
| train |             **
+-------+            *
         **        **
           **    **
             *  *
        +----------+
        | evaluate |
        +----------+

The pipeline can also be seen from the point of view of how stage outputs/dependencies are connected (using the --outs option). Notice that the resulting graph may be different:

$ dvc dag --outs
                  +---------------+
                  | data/prepared |
                  +---------------+
                          *
                          *
                          *
                  +---------------+
                  | data/features |
                **+---------------+**
            ****          *          *****
       *****              *               ****
   ****                   *                   ****
***                 +-----------+                 ***
  **                | model.pkl |                **
    **              +-----------+              **
      **           **           **           **
        **       **               **       **
          **   **                   **   **
      +-------------+            +----------+
      | scores.json |            | prc.json |
      +-------------+            +----------+

Example: Mermaid flowchart

The --mermaid flag will generate a flowchart in Mermaid format:

$ dvc dag --mermaid
flowchart TD
        node1["data/data.xml.dvc"]
        node2["evaluate"]
        node3["featurize"]
        node4["prepare"]
        node5["train"]
        node1-->node4
        node3-->node2
        node3-->node5
        node4-->node3
        node5-->node2

When the --md flag is passed, the mermaid output will be wrapped inside a Markdown fenced code block. Note that this output is automatically rendered as a diagram in GitHub and in GitLab.

You can combine dvc dag --md with the cml send-comment of CML:

dvc dag --md >> dag.md
cml send-comment dag.md
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