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# Pipeline
Pipeline is a meta-estimator capable of transforming an input dataset by applying a series of [Transformer](transformers/api.md) *middleware*. Under the hood, Pipeline will automatically fit the training set and transform any [Dataset](datasets/api.md) object supplied as an argument to one of the base estimator's methods before reaching the method context. With *elastic* mode enabled, Pipeline will update the fitting of [Elastic](transformers/api.md#elastic) transformers during partial training.

!!! note
    Pipeline modifies the input dataset during fitting. If you need to keep a *clean* dataset in memory, you can clone the dataset object before calling the method that consumes it.

**Interfaces:** [Estimator](estimator.md), [Learner](learner.md), [Online](online.md), [Probabilistic](probabilistic.md), [Scoring](scoring.md), [Persistable](persistable.md)

**Data Type Compatibility:** Depends on base learner and transformers

## Parameters
| # | Name | Default | Type | Description |
|---|---|---|---|---|
| 1 | transformers |  | array | A list of transformers to be applied in order. |
| 2 | estimator |  | Estimator | An instance of a base estimator to receive the transformed data. |
| 3 | elastic | true | bool | Should we update the elastic transformers during partial training? |

## Example
```php
use Rubix\ML\Pipeline;
use Rubix\ML\Transformers\MissingDataImputer;
use Rubix\ML\Transformers\OneHotEncoder;
use Rubix\ML\Transformers\PrincipalComponentAnalysis;
use Rubix\ML\Classifiers\SoftmaxClassifier;

$estimator = new Pipeline([
	new MissingDataImputer(),
	new OneHotEncoder(), 
	new PrincipalComponentAnalysis(20),
], new SoftmaxClassifier(128), true);
```

## Additional Methods
This meta-estimator does not have any additional methods.

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