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🏗️ Topic 03: LLM Architecture Overview — Under the Hood

Course: LLM Engineering — Hinglish Section: 1 — LLM Foundations Level: Beginner → Intermediate…

Overview

🏗️ Topic 03: LLM Architecture Overview — Under the Hood — Quick Facts

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Model: Parameters

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GPT-2 Small: 117M

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GPT-2 XL: 1.5B

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LLaMA-2 7B: 7B

Topic 1

📌 Objectives

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LLM ka internal architecture…

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Neural network layers ka role…

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Transformer blocks ka kaam dekhna

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Parameter count aur model size ka…

Topic 2

🧠 1. LLM Ka Basic Structure

📐 Socho ek LLM ek massive building hai jisme multiple floors hain: `…

Topic 3

🔄 2. Transformer Block — Core Unit

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Self-Attention = Har word dusre…

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FFN = Information ko…

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Add & Norm = Training stable…

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Residual Connection = Original…

Topic 4

📊 3. Model Size Breakdown

⚙️ LLM ka "size" parameters se measure hota hai: `…

Topic 5

🧮 4. Parameter Calculation

🏛️ Parameter count kaise calculate karte hain? Yeh formula samjho: `…

Topic 6

🔀 5. Decoder-Only vs Encoder-Decoder

📊 ` ┌────────────────────────┬──────────────────────────┐ │ DECODER-ONLY (GPT) │…

Topic 7

🔥 6. Attention Masking — Causal vs Bidirectional

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Causal Mask = Generation ke liye…

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Bidirectional = Understanding ke…

Topic 8

💻 7. Python Code — Simplified LLM Architecture

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Head 1: Syntax patterns dekh raha…

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Head 2: Semantic similarity dekh…

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Head 3: Positional relationships…

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...etc

Topic 9

🧩 8. Modern Architectural Innovations

🏗️ 8.1 RoPE (Rotary Position Embedding) ` Traditional Positional Encoding: position_vector +…

Topic 10

🆚 9. Architecture Comparison Table

Topic 11

❓ 10. Quiz — 5 MCQs

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a) CNN Layer

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b) RNN Cell

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c) Transformer Block ✅

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d) LSTM Unit

Topic 12

🔗 Navigation

⚙️ | ⬅️ Previous | 📚 Index | ➡️ Next | |---|---|---| | 02-LLM-History.md | 00-Index.md |…

Comparison

🆚 9. Architecture Comparison Table

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Type: Decoder

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Attention: MHA + MoE

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Position: Unknown

Quick Quiz

Quiz — Question 1

🏗️ Topic 03: LLM Architecture Overview — Under the Hood ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

🏗️ Topic 03: LLM Architecture Overview — Under the Hood ka 'GPT-2 Small' kya hai?

Complete! 🎉

🏗️ Topic 03: LLM Architecture Overview — Under the Hood Complete!

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