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Hydra provides a few options to improve debuggability.

Printing the configuration#

Print the config for your app without running your function by adding --cfg or -c to the command line.

The --cfg option takes one argument indicating which part of the config to print:

  • job: Your config
  • hydra: Hydra's config
  • all: The full config, which is a union of job and hydra.
# A normal run:$ python my_app.pyMySQL connecting to localhost with user=root and password=1234
# just show the config without running your function:$ python --cfg jobdb:  host: localhost  user: root  password: 1234

The printed config includes any modifications done via the command line:

$ python --cfg jobdb:  host:  user: root  password: 1234

You can use --package or -p to display a subset of the configuration:

python --cfg hydra --package hydra.job# @package hydra.jobname: my_appconfig_name: config...

By default, config interpolations are not resolved. To print resolved config use the --resolve flag in addition to the --cfg flag


The --info flag can provide information about various aspects of Hydra and your application:

  • --info all: Default behavior, prints everything
  • --info config: Prints information useful to understanding the config composition:
    Config Search Path, Defaults Tree, Defaults List and the final config.
  • --info defaults: Prints the Final Defaults List
  • --info defaults-tree: Prints the Defaults Tree
  • --info plugins: Prints information about installed plugins