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# How to create and optimize a baseline ElasticNet Regression model in python

This recipe helps you create and optimize a baseline ElasticNet Regression model in python

Many a times while working on a dataset and using a Machine Learning model we don't know which set of hyperparameters will give us the best result. Passing all sets of hyperparameters manually through the model and checking the result might be a hectic work and may not be possible to do.

Here we will be creating elasticnet regressor model and will use gridsearchCV to optimize the parameters.

This data science python source code does the following:

1. Imports necessary libraries needed for elastic net.

2. Tuning the parameters of Elasstic net regression.

3. Performns train_test_split and crossvalidation on your dataset.

So this recipe is a short example of how we can create and optimize a baseline ElasticNet Regression model

```
from sklearn import decomposition, datasets
from sklearn import linear_model
from sklearn.pipeline import Pipeline
from sklearn.model_selection import GridSearchCV, cross_val_score
from sklearn.preprocessing import StandardScaler
```

Here we have imported various modules like decomposition, datasets,linear_model, Pipeline, StandardScaler and GridSearchCV from differnt libraries. We will understand the use of these later while using it in the in the code snipet.

For now just have a look on these imports.

Here we have used datasets to load the inbuilt iris dataset and we have created objects X and y to store the data and the target value respectively.
```
dataset = datasets.load_iris()
X = dataset.data
y = dataset.target
```

StandardScaler is used to remove the outliners and scale the data by making the mean of the data 0 and standard deviation as 1. So we are creating an object std_scl to use standardScaler.
```
std_slc = StandardScaler()
```

We are also using Principal Component Analysis(PCA) which will reduce the dimension of features by creating new features which have most of the varience of the original data.
```
pca = decomposition.PCA()
```

Here, we are using ElasticNet as a Machine Learning model and will use GridSearchCV. So we have created an object elasticnet.
```
elasticnet = linear_model.ElasticNet()
```

Pipeline will helps us by passing modules one by one through GridSearchCV for which we want to get the best parameters. So we are making an object pipe to create a pipeline for all the three objects std_scl, pca and elasticnet.
```
pipe = Pipeline(steps=[('stc_slc', stc_slc),
('pca', pca),
('elasticnet', elasticnet)])
```

Now we have to define the parameters that we want to optimise for these three objects.

StandardScaler doesnot requires any parameters to be optimised by GridSearchCV.

Principal Component Analysis requires a parameter 'n_components' to be optimised. 'n_components' signifies the number of components to keep after reducing the dimension.
```
n_components = list(range(1,X.shape[1]+1,1))
```

Elasticnet requires two parameters 'normalize' and 'selection' to be optimised by GridSearchCV. So we have set these two parameters to pass from GridSearchCV will select the best value of parameter.
```
normalize = [True, False]
selection = ['cyclic', 'random']
```

Now we are creating a dictionary to set all the parameters options for different objects.
```
parameters = dict(pca__n_components=n_components,
elasticnet__normalize=normalize,
elasticnet__selection=selection)
```

Before using GridSearchCV, lets have a look on the important parameters.

- estimator: In this we have to pass the models or functions on which we want to use GridSearchCV
- param_grid: Dictionary or list of parameters of models or function in which GridSearchCV have to select the best.
- Scoring: It is used as a evaluating metric for the model performance to decide the best hyperparameters, if not especified then it uses estimator score.

```
clf_EN = GridSearchCV(pipe, parameters)
clf_EN.fit(X, y)
```

Now we are using print statements to print the results. It will give the values of hyperparameters as a result.
```
print('Best Number Of Components:', clf_EN.best_estimator_.get_params()['pca__n_components'])
print(clf_EN.best_estimator_.get_params()['elasticnet'])
```

As an output we get:
Best Number Of Components: 1 ElasticNet(alpha=1.0, copy_X=True, fit_intercept=True, l1_ratio=0.5, max_iter=1000, normalize=True, positive=False, precompute=False, random_state=None, selection='cyclic', tol=0.0001, warm_start=False)

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