# transforms.api.Pipeline

## *class* transforms.api.Pipeline {#transforms.api.Pipeline}

An object for grouping a collection of [`Transform`](../api-transform/index.md#transforms.api.Transform) objects.

### add\_transforms(\*transforms) {#transforms.api.Pipeline.add\_transforms}

Register the given [`Transform`](../api-transform/index.md#transforms.api.Transform) objects to the pipeline instance.

* **Parameters:**
  **\*transforms** ([*Transform*](../api-transform/index.md#transforms.api.Transform)) – The transforms to register.
* **Raises:**
  * **ValueError** – If multiple [`Transform`](../api-transform/index.md#transforms.api.Transform) objects write     to the same [`Output`](../api-output/index.md#transforms.api.Output) alias.
  * **ValueError** – If multiple [`Transform`](../api-transform/index.md#transforms.api.Transform) objects have the same compute function reference.

### discover\_transforms(\*modules) {#transforms.api.Pipeline.discover\_transforms}

Recursively find and import modules, registering every module-level transform.

This method recursively finds and imports modules starting at the given module’s `__path__`. Each module found is imported and any attribute that is an instance of [`Transform`](../api-transform/index.md#transforms.api.Transform) as constructed by the transforms decorators will be registered to the pipeline.

```python
>>> import myproject
>>> p = Pipeline()
>>> p.discover_transforms(myproject)
```

* **Parameters:**
  **\*modules** (*module*) – The modules to start searching from.

:::callout{theme="success"}
Each module found is imported. Try to avoid executing code at the module-level.
:::

### *property* transforms {#transforms.api.Pipeline.transforms}

The list of transforms registered to the pipeline.

* **Type:**
  List\[[Transform](../api-transform/index.md#transforms.api.Transform)]