02-Linear-Regression-Project-Exercise

Driptanil DattaSoftware Developer

Linear Regression Project Exercise

Now that we have learned about feature engineering, cross validation, and grid search, let's test all your new skills with a project exercise in Machine Learning. This exercise will have a more guided approach, later on the ML projects will begin to be more open-ended. We'll start off with using the final version of the Ames Housing dataset we worked on through the feature engineering section of the course. Your goal will be to create a Linear Regression Model, train it on the data with the optimal parameters using a grid search, and then evaluate the model's capabilities on a test set.

Complete the tasks in bold

TASK: Run the cells under the Imports and Data section to make sure you have imported the correct general libraries as well as the correct datasets. Later on you may need to run further imports from scikit-learn.

Imports

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns

Data

df = pd.read_csv("../DATA/AMES_Final_DF.csv")

df.head()

HTML

Lot Frontage
Lot Area
Overall Qual
Overall Cond
Year Built

df.info()

STDOUT

<class 'pandas.core.frame.DataFrame'>
RangeIndex: 2925 entries, 0 to 2924
Columns: 274 entries, Lot Frontage to Sale Condition_Partial
dtypes: float64(11), int64(263)
memory usage: 6.1 MB

TASK: The label we are trying to predict is the SalePrice column. Separate out the data into X features and y labels

TASK: Use scikit-learn to split up X and y into a training set and test set. Since we will later be using a Grid Search strategy, set your test proportion to 10%. To get the same data split as the solutions notebook, you can specify random_state = 101

TASK: The dataset features has a variety of scales and units. For optimal regression performance, scale the X features. Take carefuly note of what to use for .fit() vs what to use for .transform()

TASK: We will use an Elastic Net model. Create an instance of default ElasticNet model with scikit-learn

TASK: The Elastic Net model has two main parameters, alpha and the L1 ratio. Create a dictionary parameter grid of values for the ElasticNet. Feel free to play around with these values, keep in mind, you may not match up exactly with the solution choices

TASK: Using scikit-learn create a GridSearchCV object and run a grid search for the best parameters for your model based on your scaled training data. In case you are curious about the warnings you may recieve for certain parameter combinations (opens in a new tab)

TASK: Display the best combination of parameters for your model

TASK: Evaluate your model's performance on the unseen 10% scaled test set. In the solutions notebook we achieved an MAE of $\$$14149 and a RMSE of$ $$20532

Great work!

01 Grid Search 03 Linear Regression Project Exercise Solutions