Siddhartha Lahiri
Build Your First LLM from ScratchPart 1 · Section 9 of 9

Summary: The Complete Picture

Here's the complete journey from "two plus three" to "five":

Training: How the Factory Learns

Child robot learning math with number blocks
1. Learn from examples
Robot learning through trial and error
2. Improve through feedback

Generation: The Assembly Line

Tokenization factory
1. Tokenize: words → numbers
Embedding factory
2. Embed: numbers → vectors
Positional encoding factory
3. Position: add word order
Attention factory
4. Attention: words communicate
Output layer factory
5. Output: score every word
Generation factory
6. Generate: pick the answer
Result: "two plus three" → "five"
Helpful?
Step 6: GenerationPart 2: Why a Calculator?