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custom functions intro

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website/docs/usage/training.md
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@ -481,9 +481,23 @@ still look good.
</Accordion>
## Custom model implementations and architectures {#custom-functions}
## Custom Functions {#custom-functions}
<!-- TODO: intro, should summarise what spaCy v3 can do and that you can now use fully custom implementations, models defined in PyTorch and TF, etc. etc. -->
Registered functions in the training config files can refer to built-in
implementations, but you can also plug in fully custom implementations. To do
so, you first write your own implementation of a custom architectures, data
reader or any other functionality, and then register this function with the
correct [registry](/api/top-level#registry). This allows you to plug in models
defined in PyTorch or Tensorflow, make custom modifications to the `nlp` object,
create custom optimizers or schedules, or write a function that streams in data
and preprocesses it on the fly while training.
Each custom function can have any numbers of arguments that should be passed
into them through the config similar as with the built-in functions. If your
function defines **default argument values**, spaCy is able to auto-fill your
config when you run [`init fill-config`](/api/cli#init-fill-config). If you want
to make sure that a given parameter is always explicitely set in the config,
avoid setting a default value for it.
### Training with custom code {#custom-code}
@ -642,11 +656,7 @@ In your config, you can now reference the schedule in the
starting with an `@`, it's interpreted as a reference to a function. All other
settings in the block will be passed to the function as keyword arguments. Keep
in mind that the config shouldn't have any hidden defaults and all arguments on
the functions need to be represented in the config. If your function defines
**default argument values**, spaCy is able to auto-fill your config when you run
[`init fill-config`](/api/cli#init-fill-config). If you want to make sure that a
given parameter is always explicitely set in the config, avoid setting a default
value for it.
the functions need to be represented in the config.
```ini
### config.cfg (excerpt)