Object instantiation changes

Overview

Hydra 1.0.0 is deprecating ObjectConf and the corresponding config structure to a simpler one without the params node. This removes a level of nesting from command line and configs overrides.

Hydra 0.11

class: my_app.MySQLConnection
params:
  host: localhost
  user: root
  password: 1234

Hydra 1.0

_target_: my_app.MySQLConnection
host: localhost
user: root
password: 1234

Hydra configuration

Hydra plugins are configured using the same mechanism. This means that this change will effect how all plugins are configured and overridden. This is a breaking change for code overriding configs in such plugins, but luckily it's easy to fix.

As an example, a Sweeper plugin override will change as follows:

Hydra 0.11

hydra.sweeper.params.max_batch_size=10

Hydra 1.0

hydra.sweeper.max_batch_size=10