# `search.py`

**Source**: [`examples/rags/contextual_rag/search.py`](https://github.com/hienhayho/rag-colls/blob/HEAD/examples/rags/contextual_rag/search.py)  
```python
from rag_colls.llms.litellm_llm import LiteLLM
from rag_colls.databases.bm25.bm25s import BM25s
from rag_colls.embeddings.openai_embedding import OpenAIEmbedding
from rag_colls.rerankers.weighted_reranker import WeightedReranker
from rag_colls.processors.chunkers.semantic_chunker import SemanticChunker
from rag_colls.databases.vector_databases.chromadb import ChromaVectorDatabase

from rag_colls.rags.contextual_rag import ContextualRAG, CONTEXTUAL_PROMPT

rag = ContextualRAG(
    vector_database=ChromaVectorDatabase(
        persistent_directory="./chroma_db", collection_name="test"
    ),
    bm25=BM25s(
        save_dir="./bm25s",
    ),
    reranker=WeightedReranker(weights=[0.8, 0.2]),  # [semantic_weight, bm25_weight]
    chunker=SemanticChunker(embed_model_name="text-embedding-ada-002"),
    llm=LiteLLM(model_name="openai/gpt-4o-mini"),
    embed_model=OpenAIEmbedding(model_name="text-embedding-ada-002"),
    gen_contextual_prompt_template=CONTEXTUAL_PROMPT,
)

response = rag.search(query="What is Chain Buddy ?", top_k=5)

print(response.content)
print("===========")
print(response.usage)

```