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Penting untuk AI

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Rumus Matematika Penting untuk AI

1. Aljabar Linear

  • Vektor & Matriks: Representasi data dalam bentuk array 2D.
  • Transpose: A^T (menukar baris dan kolom).
  • Dot Product: a . b = |a||b|cos(θ).
  • Perkalian Matriks: C = A × B.
  • Eigenvalue / Eigenvector: Untuk PCA & dimensi reduksi.
  • Norm: ||x|| = √(x₁² + x₂² + ... + xₙ²).

2. Kalkulus

  • Turunan: ∂L/∂x → Gradien perubahan.
  • Chain Rule: dy/dx = dy/du × du/dx.
  • Gradient Descent: θ = θ - α ∇L(θ).
  • Fungsi Aktivasi: Sigmoid, ReLU, tanh (beserta turunannya).
  • Backpropagation: Digunakan dalam training neural network.

3. Statistik & Probabilitas

  • Mean, Median, Variansi: Ukuran sebaran dan pusat data.
  • Distribusi Normal: Bell curve untuk probabilitas umum.
  • Bayes Theorem: P(A|B) = P(B|A)×P(A)/P(B).
  • Entropy: Mengukur ketidakpastian.
  • KL Divergence: Ukur perbedaan dua distribusi probabilitas.

4. Teori Optimasi

  • Gradient Descent: θ = θ - α × ∇L(θ).
  • Learning Rate (α): Besarnya langkah per iterasi.
  • Loss Function: MSE = (1/n) Σ(y - ŷ)², Cross Entropy untuk klasifikasi.
  • Regularisasi: L2 = λΣw² → mencegah overfitting.

5. Teori Informasi & Komputasi

  • Shannon Entropy: Mengukur informasi atau ketidakpastian.
  • Kolmogorov Complexity: Ukuran kompleksitas algoritmik data.
  • Mesin Turing: Model dasar dari kecerdasan buatan teoritis.

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