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svm implementation in python

aiml aits answered on February 12, 2023 Popularity 9/10 Helpfulness 1/10

answer svm implementation in python

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svm implementation in python

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# importing scikit learn with make_blobs
from sklearn.datasets.samples_generator import make_blobs
  
# creating datasets X containing n_samples
# Y containing two classes
X, Y = make_blobs(n_samples=500, centers=2,
                  random_state=0, cluster_std=0.40)
import matplotlib.pyplot as plt
# plotting scatters 
plt.scatter(X[:, 0], X[:, 1], c=Y, s=50, cmap='spring');
plt.show()

Popularity 9/10 Helpfulness 1/10 Language c

Source: www.geeksforgeeks.org

Tags: c python

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Contributed on Aug 24 2023

aiml aits

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# Method 1 : SVM (Support Vector Machine)
from sklearn.svm import LinearSVC, SVC 
svm = LinearSVC(class_weight='balanced', random_state=42, loss="hinge", fit_intercept=False) 
svm_alternative = SVC(kernel='linear', gamma=.5, probability=True) # Alternative 1

# in contrast to scikit-learn's LinearSVC, Snap ML offers multi-threaded CPU/GPU training of SVMs
from snapml import SupportVectorMachine
snapml_svm_cpu = SupportVectorMachine(class_weight='balanced', n_jobs=4, fit_intercept=False) # Alternative 2 
snapml_svm_gpu = SupportVectorMachine(class_weight='balanced', use_gpu=True, fit_intercept=False) # Alternative 3

# Method 2 : SGD (Stochastic Gradient Descent)
from sklearn.linear_model import SGDClassifier
sgd = SGDClassifier(loss='hinge', class_weight='balanced', random_state=42, fit_intercept=False)

# Measure training time
t0 = time.time()
model.fit(X_train, y_train)
train_time = time.time() - t0

# Predict
y_pred = model.predict(X_test)

# Evaluate model
roc_auc_score(y_test, y_pred)

# Get confidence score for probability
y_pred_conf = model.decision_function(X_test)

# Evaluate hinge loss
hinge_loss(y_test, y_pred_conf)

# See index of support vectors in X
svm.support_
# Fetch support vector points from training set (Training with only support will yield same model)
X_small = X[svm.support_]
y_small = y[svm.support_]

Popularity 10/10 Helpfulness 5/10 Language python

Source: Grepper

Tags: python py

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Contributed on Feb 12 2023

Innocent Iguana

0 Answers Avg Quality 2/10

svm implementation in python

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