How do AI models really work with information?
The Training Limitation
Language models are trained on massive datasets, but once training is done:
1. Their knowledge is frozen in time
2. They can't directly access external information
3. They work purely through pattern recognition
Model training date: 2023
Question: "Who won the 2024 Super Bowl?"
Response: "I apologize, but I don't have access to information about events after 2023."
Common Misconception: "AI models can search the internet or your files"
Reality: They can only work with what's in their training data or explicitly provided in the prompt
UNDERSTANDING VECTOR SEARCH
How do we find relevant information?
Converting Text to Numbers
Text → Vector Embeddings (high-dimensional number arrays)
"cat" → [0.2, -0.5, 0.8, ...]
"kitten" → [0.3, -0.4, 0.7, ...]
"database" → [-0.8, 0.1, -0.3, ...]
Similar meanings = Similar vectors
"cat" is closer to "kitten" than to "database" in vector space
This is how we find relevant documents:
1. Convert search query to vector
2. Find documents with similar vectors
3. Return the most relevant matches
RAG IN ACTION
Retrieval-Augmented Generation: Step by Step
1. Query
"Write a proposal for Google"
2. Search
Find relevant docs
3. Augment
Add to prompt
4. Generate
Create response
# 1. Initial query vector
query_vector = embed("Write a proposal for Google")

# 2. Find similar documents
relevant_docs = vector_search(query_vector)

# 3. Create enhanced prompt
prompt = f"""Using these documents as reference: {relevant_docs} Write a proposal following our guidelines."""

# 4. Generate with context
response = model.generate(prompt)
Key Understanding:
- Not training or learning
- Just smart document retrieval + context-aware generation
- Like giving reference materials to a knowledgeable person
PRACTICAL APPLICATION
Seeing It All Come Together
Without RAG
Q: "What was our Q4 revenue?"
A: "I don't have access to your company's financial data."
With RAG
1. Find Q4 report
2. Add to context
3. Generate informed response
A: "Based on the Q4 report, revenue was $10.2M"
RAG makes AI useful for specific tasks by:
1. Finding relevant information in real-time
2. Adding it to the conversation context
3. Letting the model use both its training and your data
THE BIG PICTURE
How it All Comes Together
RAG Architecture
Smart Lookup + AI Understanding = Powerful Results
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