# Pipeline Default Parameters

The pipeline allows you to define **default parameters** that will later be used by the functions executed in each step.\
These defaults can be provided either directly as **keyword arguments** (*kwargs*) or via a **configuration file** in YAML format.\
Defaults are optional and can be set in two ways:

* When creating the pipeline (through the constructor)
* Later, using the `set_defaults()` method

```
pipeline = CIPipe(
    pipeline_input,
    file_system=self._file_system,
    defaults={'factor': 3, 'multiplier': 4}
)

pipeline = CIPipe(
    pipeline_input,
    file_system=self._file_system,
    defaults_path=config_path
)
```

Here, `defaults` is a dictionary with key-value pairs, while `defaults_path` is the path to a **YAML file** that contains default parameter definitions in this format:

```
factor: 5
multiplier: 2
```

The pipeline automatically reads the YAML and converts it to a Python dictionary internally.

***

#### Setting defaults after initialization

You can also define or override default values later using `set_defaults()`:

```
pipeline.set_defaults(factor=3)

pipeline.set_defaults(defaults_path=config_path)
```

Both options can also be combined:

```
pipeline.set_defaults(factor=10, defaults_path=config_path)

pipeline = CIPipe(
    pipeline_input,
    file_system=self._file_system,
    defaults={'factor': 10},
    defaults_path=config_path
)
```

***

#### Combined behavior and precedence

When both types of defaults are provided, the pipeline **merges them**, giving **priority to the manually passed parameters** over the YAML values.

For example, if the YAML file contains:

```
factor: 15
multiplier: 2
offset: 5
```

and you execute:

```
pipeline.set_defaults(factor=10, defaults_path=config_path)
```

the final default values used during pipeline execution will be:

```
{
    "factor": 10,
    "multiplier": 2,
    "offset": 5
}
```

The value of `factor` is overwritten by the manually passed parameter, while the other values are kept from the YAML file.

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