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Please enable JavaScript in your browser settings or update your browser.Challenge: Classifying Unseparateble Data | Logistic Regression
Classification with Python
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Classification with Python

Classification with Python

1. k-NN Classifier
What is ClassificationWhat is k-NNk-NN with Multiple FeaturesImplementing k-NNMulti-Class ClassificationTrain-test Split. Cross ValidationChallenge: Choosing the Best K Value.k-NN Summary
2. Logistic Regression
What is Logistic RegressionFinding the ParametersChallenge: Implementing Logistic RegressionDecision BoundaryOverfitting. RegularizationChallenge: Classifying Unseparateble DataLogistic Regression Summary
3. Decision Tree
What is Decision TreeSplitting the NodesCrazy TreeChallenge: Implementing a Decision TreeDecision Tree Summary
4. Random Forest
What is Random ForestThe Randomness of ForestChallenge: Implementing a Random ForestRandom Forest Summary
5. Comparing Models
Confusion MatrixMetricsChallenge: Comparing ModelsSummary

Challenge: Classifying Unseparateble Data

In this Challenge, you are given the following dataset:


              
1234

            
import pandas as pd

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
print(df.head())
copy

Here is its plot.


              
12345

            
import pandas as pd
import matplotlib.pyplot as plt

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
plt.scatter(df['X1'], df['X2'], c=df['y'])
copy

The dataset is for sure not linearly separable. Let's look at the Logistic Regression performance:


              
123456789101112

            
import pandas as pd
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import cross_val_score

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
X = df[['X1', 'X2']]
y = df['y']

X = StandardScaler().fit_transform(X)
lr = LogisticRegression().fit(X, y)
print(cross_val_score(lr, X, y).mean())
copy

The result is awful. Regular Logistic Regression is not suited for this task. Your task is to check whether the PolynomialFeatures will help. To find the best C parameter, you will use the GridSearchCV class.

In this challenge, the Pipeline is used. You can think of it as a list of preprocessing steps. Its .fit_transform() method sequentially applies .fit_transform() to each item.

Tarefa

Build a Logistic Regression model with polynomial features and find the best C parameter using GridSearchCV

  1. Create a pipeline to make an X_poly variable that will hold the polynomial features of degree 2 of X and be scaled.
  2. Create a param_grid dictionary to tell the GridSearchCV you want to try values [0.01, 0.1, 1, 10, 100] of a C parameter.
  3. Initialize and train a GridSearchCV object.

Tarefa

Build a Logistic Regression model with polynomial features and find the best C parameter using GridSearchCV

  1. Create a pipeline to make an X_poly variable that will hold the polynomial features of degree 2 of X and be scaled.
  2. Create a param_grid dictionary to tell the GridSearchCV you want to try values [0.01, 0.1, 1, 10, 100] of a C parameter.
  3. Initialize and train a GridSearchCV object.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

Seção 2. Capítulo 6
toggle bottom row

Challenge: Classifying Unseparateble Data

In this Challenge, you are given the following dataset:


              
1234

            
import pandas as pd

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
print(df.head())
copy

Here is its plot.


              
12345

            
import pandas as pd
import matplotlib.pyplot as plt

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
plt.scatter(df['X1'], df['X2'], c=df['y'])
copy

The dataset is for sure not linearly separable. Let's look at the Logistic Regression performance:


              
123456789101112

            
import pandas as pd
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import cross_val_score

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
X = df[['X1', 'X2']]
y = df['y']

X = StandardScaler().fit_transform(X)
lr = LogisticRegression().fit(X, y)
print(cross_val_score(lr, X, y).mean())
copy

The result is awful. Regular Logistic Regression is not suited for this task. Your task is to check whether the PolynomialFeatures will help. To find the best C parameter, you will use the GridSearchCV class.

In this challenge, the Pipeline is used. You can think of it as a list of preprocessing steps. Its .fit_transform() method sequentially applies .fit_transform() to each item.

Tarefa

Build a Logistic Regression model with polynomial features and find the best C parameter using GridSearchCV

  1. Create a pipeline to make an X_poly variable that will hold the polynomial features of degree 2 of X and be scaled.
  2. Create a param_grid dictionary to tell the GridSearchCV you want to try values [0.01, 0.1, 1, 10, 100] of a C parameter.
  3. Initialize and train a GridSearchCV object.

Tarefa

Build a Logistic Regression model with polynomial features and find the best C parameter using GridSearchCV

  1. Create a pipeline to make an X_poly variable that will hold the polynomial features of degree 2 of X and be scaled.
  2. Create a param_grid dictionary to tell the GridSearchCV you want to try values [0.01, 0.1, 1, 10, 100] of a C parameter.
  3. Initialize and train a GridSearchCV object.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

Seção 2. Capítulo 6
toggle bottom row

Challenge: Classifying Unseparateble Data

In this Challenge, you are given the following dataset:


              
1234

            
import pandas as pd

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
print(df.head())
copy

Here is its plot.


              
12345

            
import pandas as pd
import matplotlib.pyplot as plt

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
plt.scatter(df['X1'], df['X2'], c=df['y'])
copy

The dataset is for sure not linearly separable. Let's look at the Logistic Regression performance:


              
123456789101112

            
import pandas as pd
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import cross_val_score

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
X = df[['X1', 'X2']]
y = df['y']

X = StandardScaler().fit_transform(X)
lr = LogisticRegression().fit(X, y)
print(cross_val_score(lr, X, y).mean())
copy

The result is awful. Regular Logistic Regression is not suited for this task. Your task is to check whether the PolynomialFeatures will help. To find the best C parameter, you will use the GridSearchCV class.

In this challenge, the Pipeline is used. You can think of it as a list of preprocessing steps. Its .fit_transform() method sequentially applies .fit_transform() to each item.

Tarefa

Build a Logistic Regression model with polynomial features and find the best C parameter using GridSearchCV

  1. Create a pipeline to make an X_poly variable that will hold the polynomial features of degree 2 of X and be scaled.
  2. Create a param_grid dictionary to tell the GridSearchCV you want to try values [0.01, 0.1, 1, 10, 100] of a C parameter.
  3. Initialize and train a GridSearchCV object.

Tarefa

Build a Logistic Regression model with polynomial features and find the best C parameter using GridSearchCV

  1. Create a pipeline to make an X_poly variable that will hold the polynomial features of degree 2 of X and be scaled.
  2. Create a param_grid dictionary to tell the GridSearchCV you want to try values [0.01, 0.1, 1, 10, 100] of a C parameter.
  3. Initialize and train a GridSearchCV object.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

In this Challenge, you are given the following dataset:


              
1234

            
import pandas as pd

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
print(df.head())
copy

Here is its plot.


              
12345

            
import pandas as pd
import matplotlib.pyplot as plt

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
plt.scatter(df['X1'], df['X2'], c=df['y'])
copy

The dataset is for sure not linearly separable. Let's look at the Logistic Regression performance:


              
123456789101112

            
import pandas as pd
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import cross_val_score

df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/b71ff7ac-3932-41d2-a4d8-060e24b00129/circles.csv')
X = df[['X1', 'X2']]
y = df['y']

X = StandardScaler().fit_transform(X)
lr = LogisticRegression().fit(X, y)
print(cross_val_score(lr, X, y).mean())
copy

The result is awful. Regular Logistic Regression is not suited for this task. Your task is to check whether the PolynomialFeatures will help. To find the best C parameter, you will use the GridSearchCV class.

In this challenge, the Pipeline is used. You can think of it as a list of preprocessing steps. Its .fit_transform() method sequentially applies .fit_transform() to each item.

Tarefa

Build a Logistic Regression model with polynomial features and find the best C parameter using GridSearchCV

  1. Create a pipeline to make an X_poly variable that will hold the polynomial features of degree 2 of X and be scaled.
  2. Create a param_grid dictionary to tell the GridSearchCV you want to try values [0.01, 0.1, 1, 10, 100] of a C parameter.
  3. Initialize and train a GridSearchCV object.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 2. Capítulo 6
Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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