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77 284

PCA mainly tries to preserve:

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77 284

What is the main purpose of PCA?

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77 284

What does PCA stand for?

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✅ PCA (Principal Component Analysis) Basics 📉🤖 👉 PCA is a Dimensionality Reduction technique used to simplify large datasets while keeping important information. 🔹 1. What is Dimensionality Reduction? 👉 Reducing the number of features columns in data. Example: Instead of 100 features → reduce to 10 important features. ✔ Faster training ✔ Better visualization ✔ Reduced complexity 🔥 2. What is PCA? PCA = Principal Component Analysis 👉 It transforms data into new components called: ✔ Principal Components These components capture the maximum variance in data. 🔹 3. Why PCA is Important? ✔ Reduces high-dimensional data ✔ Improves model performance ✔ Helps avoid overfitting ✔ Useful for visualization 🔹 4. How PCA Works (Simple Idea) 1️⃣ Find directions with maximum variance 2️⃣ Create principal components 3️⃣ Keep most important components 4️⃣ Remove less useful information 🔹 5. Example 👉 Suppose dataset has: • Height • Weight • BMI • Body Fat Many features may contain similar information. PCA combines them into fewer components. 🔹 6. Important Terms ⭐ ✔ Variance → Spread of data ✔ Principal Component → New feature ✔ Explained Variance → Information retained 🔹 7. Implementation (Python)

from sklearn.decomposition import PCA
import numpy as np

X = np.array([
    [1,2],
    [3,4],
    [5,6]
])

pca = PCA(n_components=1)

X_pca = pca.fit_transform(X)

print(X_pca)

🔹 8. Advantages ✔ Faster ML models ✔ Reduces noise ✔ Better visualization 🔹 9. Disadvantages ❌ Hard to interpret transformed features ❌ Possible information loss 🔹 10. Real-World Uses ✔ Image compression ✔ Face recognition ✔ Big data preprocessing 🎯 Today’s Goal ✔ Understand dimensionality reduction ✔ Learn principal components ✔ Understand variance concept 👉 PCA = Compressing data intelligently 🔥 💬 Tap ❤️ for more!

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Which of the following is a real-world application of K-Means?

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Which method is commonly used to find the best value of K?

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What is the center of a cluster called?

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What does the “K” in K-Means represent?

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K-Means belongs to which type of Machine Learning?

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✅ Clustering with K-Means Algorithm 📊🤖 👉 K-Means is one of the most popular unsupervised learning algorithms. It groups similar data points into clusters. 🔹 1. What is Clustering? Clustering = Grouping similar data together 👉 No labels are provided. The algorithm finds hidden patterns automatically. Examples: ✔ Customer segmentation ✔ Grouping similar products ✔ Image compression 🔥 2. What is K-Means? K-Means divides data into K clusters. 👉 Each cluster has a center called Centroid. 🔹 3. How K-Means Works Step-by-step: 1️⃣ Choose number of clusters (K) 2️⃣ Select random centroids 3️⃣ Assign points to nearest centroid 4️⃣ Update centroid positions 5️⃣ Repeat until stable 🔹 4. Example 👉 Customer Segmentation Customers are grouped based on: ✔ Age ✔ Income ✔ Spending habits 🔹 5. Implementation (Python)

from sklearn.cluster import KMeans

# Sample data
X = [[1], [2], [10], [11]]

model = KMeans(n_clusters=2)

model.fit(X)

print(model.labels_)

🔹 6. Important Terms ⭐ ✔ Cluster → Group of similar points ✔ Centroid → Center of cluster ✔ K → Number of clusters 🔹 7. Choosing Best K (Elbow Method) ⭐ 👉 Elbow Method helps find optimal K. The graph looks like an elbow 🔻 🔹 8. Advantages ✔ Simple and fast ✔ Works well for grouped data ✔ Easy to implement 🔹 9. Disadvantages ❌ Need to choose K manually ❌ Sensitive to outliers ❌ Not good for irregular shapes 🔹 10. Why K-Means is Important? ✔ Used in recommendation systems ✔ Customer segmentation ✔ Market analysis 🎯 Today’s Goal ✔ Understand clustering ✔ Learn centroids & clusters ✔ Implement K-Means 👉 K-Means = Finding hidden groups in data 🔥 💬 Tap ❤️ for more!

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77 284

What is the decision boundary in SVM called?

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77 284

What are Support Vectors?

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77 284

Which kernel is commonly used in non-linear SVM?

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What is the main purpose of SVM?

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