# Import External Code

To include any existing code in your Tensorleap [Dataset Script](/user-interface/resources-management/integration-scripts.md#dataset-script) you can create a library and import all your existing classes and functions to your script. 

Here is an example of how to import a [Custom Layer](/tensorleap-integration/writing-integration-code/custom-layers.md) from an external file.

## Custom Layer Import from File

1. First, create a file that includes the custom layers that are included in your model. Here we show an example of a custom dense layer.

{% code title="custom\_dense.py" %}

```python
import tensorflow as tf

class CustomDense(tf.keras.layers.Layer):
    def __init__(self, n, **args):
        super(CustomDense, self).__init__()
        self.n = n
        self.dense = tf.keras.layers.Dense(self.n)
    
    def call(self, inputs):
        return self.dense(inputs) 
    
    def get_config(self):
        config = super().get_config()
        config.update({
            "n": self.n,
        })
        return config
```

{% endcode %}

2\.   In your [Tensorleap Data Folder](broken://pages/R0xvhzASaO2FYTmpojv5#tensorleap-data-folder), create a new folder that will include the file you've created and an empty **\_\_init\_\_.py** file. For example:

```
|
├── ....
|   ├── custom_layers/
|           ├── __init__.py
|           └── custom_dense.py
```

3\.  Now, use one of two possible methods to import the classes Into the dataset script.

## Append system path

{% code title="Tensorleap dataset script" %}

```python
# custom function imports
import sys
sys.path.append('/home/username/tensorleap/data/custom_layers')
from custom_dense import CustomDense
...
leap_binder.set_custom_layer(CustomDense, 'CustomDense')
```

{% endcode %}

OR

### Import using `importlib`

{% code title="Tensorleap dataset script" %}

```python
# custom function imports
import importlib.util
import sys
from inspect import getmembers, isclass
...
# adding custom layers from a file using imports
spec = importlib.util.spec_from_file_location('custom_layers.custom_dense',
 '/home/username/tensorleap/data/custom_layers/custom_dense.py')
custom_layers_module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(custom_layers_module)

custom_layers_titles = getmembers(custom_layers_module, isclass)
for i in range(len(custom_layers_titles)):
    class_name = custom_layers_titles[i][0]
    function_class = getattr(custom_layers_module, class_name)
    leap_binder.set_custom_layer(function_class, class_name)
...
```

{% endcode %}

Parsing the dataset will now import the custom layers from the external files and add it to your Tensorleap environment.


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